ZEYNEP  ILSEN  ÖNSAN 

Professor of Chemical Engineering, Boğaziçi University

 

 CONTACT DETAILS

 

Address:

Department of Chemical Engineering, Boğaziçi University, Bebek 34342, Istanbul-TURKEY

Phone:

+90-212-359-6412/7024

Fax:

+90-212-287-2460

e-mail:

onsan@boun.edu.tr


Last Update: November 13, 2012

EDUCATION:

1972

Ph.D. and D.I.C. (Postgraduate Diploma) in Chemical Engineering, Imperial College of Science and Technology, University of London, UK

1968

B.Sc. in Chemical Engineering, Robert College (Boğaziçi University as of 1971) Istanbul, Turkey


RESEARCH INTERESTS

Chemical and catalytic reaction/reactor analysis

Heterogeneous catalyst design and development

Clean hydrogen production and gas-to-liquid technologies

Fermentation with recombinant cell cultures


PROFESSIONAL EXPERIENCE:

Academic Positions

Assistant Professor

1972-1980

Boğaziçi University, Dept. of Chemical Engineering

Associate Professor

1980-1988

Boğaziçi University, Dept. of Chemical Engineering

Professor

1988-present

Boğaziçi University, Dept. of Chemical Engineering

 

Administrative Positions

Dean

1988-1994

Boğaziçi University, Faculty of Engineering

Chair

1992-2000

Boğaziçi University, Dept. of Chemical Engineering

Deputy Rector

2000-2004

Boğaziçi University (Deputy for Research)

 

Industrial Activities

Project evaluation and/or follow-up for
    * TÜBITAK (Scientific and Technological Research Council of Turkey) - Directorate for Technology and Innovation Funding (Business/Industry)
    * Ministry of Industry and Commerce (Industry/Academia Collaboration Funding)
In areas related to * chemical & energy technologies and
                             * industrial biotechnology


LECTURES:

Undergraduate

ChE 200

Process Flow Sheets and Principles

ChE 211

Chemical Engineering Calculations

ChE 302

Chemical Engineering Laboratory I

ChE 334

Mass Transfer Operations

ChE 342

Chemical Reaction Kinetics and Chemical Reactor Design

ChE 401

Chemical Engineering Laboratory II

ChE 415

High Polymers-Synthesis

ChE 427

Bioreaction Engineering

ChE 441

Hydrogen Technologies

ChE 492

Project

Graduate

ChE 541

Heterogeneous Reaction Kinetics

ChE 594

Advanced Biochemical Engineering

ChE 636

Selected Topics in Mass Transfer-I: Bioprocess Systems

ChE 642

Multiphase Reactor Analysis and Design

ChE 691

Advanced Topics: Current Topics in Catalyst Research

ChE 695

Advanced Topics: Multiphase Reactors

ChE 697

Advanced Topics: Sustainable Energy Systems

FET 541

Fuel Processing Technologies

FET 542

Catalysis in Fuel Technology


PhD THESES SUPERVISED: 9
M.S. THESES SUPERVISED:
69

INTERNATIONAL MEETINGS ATTENDED: 45

CONFERENCE PRESENTATIONS: 76 (international); 37 (national)


PUBLICATIONS:

 

A. BOOK CHAPTER

Z. I. Önsan and A. K. Avci, "Chapter 14. Reactor Design for Fuel Processing" in D. Shekawat, J. J. Spivey and D. A. Berry (Eds), Fuel Cells: Technologies for Fuel Processing, 1st ed, Elsevier Science, 2011, pp 451-516.

 

B. Papers in SCI-SCIE Journals

Catalyst Technology and Reaction Engineering

E. Şimşek, M. Karakaya, A. K. Avcı, Z. I. Önsan, “Oxidative steam reforming of methane to synthesis gas in microchannel reactors", International Journal of Hydrogen Energy, (2012) accepted for publication.

A. Leba, T. Davran-Candan, Z. I. Önsan,  R. Yıldırım , “DRIFTS study for selective CO oxidation over promoted Au/γ-Al2O3 catalysts”, Catalysis Communications, 26 (2012) 6-10.

F. Gökaliler, Z. I. Önsan, A. E. Aksoylu, “Power-law type rate equation for propane ATR over Pt-Ni/Al2O3 catalyst”, International Journal of Hydrogen Energy, 37(13) (2012) 10425-10429.

M. E. Günay, F. Akpinar, Z. I. Önsan, R. Yildirim, "Investigation of water-gas shift activity of Pt-MOx-CeO2/Al2O3 (M=K, Ni, Co) using modular artificial neural networks", International Journal of Hydrogen Energy, 37 (3) (2012) 2094-2102.

S. Özdemir, Z. I. Önsan, R. Yildirim, "Selective CO oxidation over monolithic Au-MgO/Al2O3 catalysts", Journal of Chemical Technology & Biotechnology, 87 (2012) 58-64.

E. Simsek, A. K. Avci, Z. I. Önsan, "Investigation of catalyst performance and microstructured reactor configuration for syngas production by methane steam reforming", Catalysis Today, 178 (2011) 157-163.

B. Gülyüz, S. Özkara-Aydinoglu, A. E. Aksoylu, Z. I. Önsan, “Kinetics of CO oxidation over Pt-CeOx supported on air-oxidized activated carbon”, Turkish Journal of Chemistry, 33(5) (2009) 589-598.
M. Karakaya, A. K. Avci, A. E. Aksoylu, Z. I. Önsan, “Steady-state and dynamic modeling of indirect partial oxidation of methane in a wall-coated microchannel”, Catalysis Today, 139 (2009) 312-321.

Ö. Tan, E. Masalaci, Z. I. Önsan, A. K. Avci, "Design of a methane processing system producing high purity hydrogen", International Journal of Hydrogen Energy, 33 (2008) 5516-5526.  

F. Soyal-Baltacioglu, A. E. Aksoylu, Z. I. Önsan, "Steam reforming of ethanol over Pt-Ni catalysts", Catalysis Today, 138 (2008) 183-186.

F. Gökaliler, B. S. Çaglayan, Z. I. Önsan, A. E. Aksoylu, "Hydrogen production by autothermal reforming of LPG for PEM fuel cell applications", International Journal of Hydrogen Energy, 33 (2008) 1383-1391.

E. Örücü, F. Gökaliler, A. E. Aksoylu, Z. I. Önsan, "Ethanol steam reforming for hydrogen production over bimetallic Pt-Ni/Al2O3", Catalysis Letters, 120(1-2) (2008) 198-203.

E. Simsek, S. Özkara, A. E. Aksoylu, Z. I. Önsan, "Preferential CO oxidation over activated carbon supported catalysts in H2-rich streams containing CO2 and H2O", Applied Catalysis A: General, 316 (2007) 169-174.

F. Soyal-Baltacioglu, B. Gülyüz, A. E. Aksoylu, Z. I. Önsan, "Low temperature CO oxidation kinetics over activated carbon supported Pt-SnOx catalysts", Turkish Journal of Chemistry, 31(5) (2007) 455-464.

Z. I. Önsan, "Catalytic processes for clean hydrogen production from hydrocarbons", Turkish Journal of Chemistry, 31 (2007) 531-550.

G. Uysal, A. N. Akin, Z. I. Önsan, R. Yildirim, "Preferential CO oxidation over Pt-SnO2/Al2O3 in hydrogen-rich streams containing CO2 and H2O (CO removal from H2 with PROX)", Catalysis Letters, 111(3-4) (2006) 173-176.

G. Uysal, A. N. Akin, Z. I. Önsan, R. Yildirim, "Hydrogen clean-up by preferential CO oxidation over Pt-Co-Ce/MgO", Catalysis Letters, 108(3-4) (2006) 193-196.

B. Selen Çaglayan, A. K. Avci, Z. I. Önsan, A. E. Aksoylu, "Production of hydrogen over bimetallic Pt-Ni/Al2O3: I. Indirect partial oxidation of propane", Applied Catalysis A: General, 280 (2005) 181-188.

B. Selen Çaglayan, Z. I. Önsan, A. E. Aksoylu, "Production of hydrogen over bimetallic Pt-Ni/Al2O3: II. Indirect partial oxidation of LPG", Catalysis Letters, 102(1-2) (2005) 63-67.

E. Örücü, M. Karakaya, A. K. Avci, Z. I. Önsan, "Investigation of ethanol conversion for hydrogen fuel cells using computer simulations", Journal of Chemical Technology & Biotechnology, 80 (2005) 1103-1110.

A. K. Avci, D. L. Trimm, A. E. Aksoylu, Z. I. Önsan, "Hydrogen production by steam reforming of n-butane over supported Ni and Pt-Ni catalysts", Applied Catalysis A: General, 258 (2004) 235-240.

A. K. Avci, Z. I. Önsan, D. L. Trimm, "On-board hydrogen generation for fuel cell powered vehicles: the use of methanol and propane", Topics in Catalysis, 22(3-4) (2003) 17-22.

A. K. Avci, D. L. Trimm, A. E. Aksoylu, Z. I. Önsan, "Ignition characteristics of propane and n-butane over supported Pt, Ni and Pt-Ni catalysts", Catalysis Letters, 88(1-2) (2003) 17-22.

A. K. Avci, D. L. Trimm, Z. I. Önsan, "Quantitative investigation of catalytic natural gas conversion for hydrogen fuel cell applications", Chemical Engineering Journal, 90 (2002) 77-87.

A. N. Akin, M. Ataman, A. E. Aksoylu, Z. I. Önsan, "CO2 fixation by hydrogenation over co-precipitated Co/Al2O3", Reaction Kinetics and Catalysis Letters, 76(2) (2002) 265-270.

D. L. Trimm, Z. I. Önsan, "On-board fuel conversion for hydrogen fuel cell driven vehicles", Catalysis Reviews: Science and Engineering, 43(1-2) (2001) 31-84.

A. K. Avci, Z. I. Önsan, D. L. Trimm, "On-board fuel conversion for hydrogen fuel cells: Comparison of different fuels by computer simulations", Applied Catalysis A: General, 216 (2001) 243-256.

A. K. Avci, D. L. Trimm, Z. I. Önsan, "Heterogeneous reactor modeling for simulation of catalytic oxidation and steam reforming of methane", Chemical Engineering Science, 56(2) (2001) 641-649.

A. N. Akin, G. Kilaz, A. I. Isli, Z. I. Önsan, "Development and characterization of Pt-SnO2/Al2O3 catalysts", Chemical Engineering Science, 56(3) (2001) 881-888.

A. N. Akin, Z. I. Önsan, "CO hydrogenation by K-promoted coprecipitated Co/Al2O3", Reaction Kinetics and Catalysis Letters, 70(2) (2000) 275-280.

R. Karaselçuk, A. I. Isli, A. E. Aksoylu, Z. I. Önsan, "CO hydrogenation over bimetallic nickel-vanadium catalysts", Applied Catalysis A: General, 192 (2000) 263-271.

T. Bülbül, A. I. Isli, A. E. Aksoylu, Z. I. Önsan, "Investigation of alternative support materials for monometallic and bimetallic catalysts of CO hydrogenation", Studies in Surface Science and Catalysis, 130 (2000) 3723-3728.

A. K. Avci, D. L. Trimm, Z. I. Önsan, "Simulation of alternative catalyst bed configurations in autothermal hydrogen production", Studies in Surface Science and Catalysis, 130 (2000) 2753-2758.

A. N. Akin, A. E. Aksoylu, Z. I. Önsan, "Adsorption and reaction studies on cobalt-alumina catalysts prepared by changing pH coprecipitation", Reaction Kinetics and Catalysis Letters, 66(2) (1999) 393-399.

A. E. Aksoylu, A. I. Isli, Z. I. Önsan, "Interaction between nickel and molybdenum in bimetallic Ni-Mo/alumina catalysts: III. Effect of impregnation strategy", Applied Catalysis A: General, 183 (1999) 357-364.

A. I. Isli, A. E. Aksoylu, Z. I. Önsan, "The effect of lanthanum and barium additives on the thermal stabilization of alumina", Turkish Journal of Chemistry, 22(3) (1998) 253-260.

A. E. Aksoylu, Z. Misirli, Z. I. Önsan, "Interaction between nickel and molybdenum in bimetallic Ni-Mo/alumina catalysts: I. CO2 methanation and SEM-TEM studies", Applied Catalysis A: General, 168 (1998) 385-397.

A. E. Aksoylu, Z. I. Önsan, "Interaction between nickel and molybdenum in bimetallic Ni-Mo/alumina catalysts: II. CO hydrogenation", Applied Catalysis A: General, 168 (1998) 399-407.

A. E. Aksoylu, Z. I. Önsan, "Kinetics of CO hydrogenation over Ni-Mo/alumina catalysts with and without K promotion", Industrial and Engineering Chemistry Research, 37(6) (1998) 2397-2403.

A. N. Akin, Z. I. Önsan, "Kinetics of CO hydrogenation over coprecipitated Co-alumina", Journal of Chemical Technology & Biotechnology, 70 (1997) 304-310.

A. N. Akin, Z. I. Önsan, "The effect of preparation variables on the CO hydrogenation activity of coprecipitated Co-alumina catalysts", Journal of Chemical Technology & Biotechnology, 69 (1997) 337-344.

A. E. Aksoylu, Z. I. Önsan, "Hydrogenation of carbon oxides using coprecipitated and impregnated nickel-alumina catalysts", Applied Catalysis A: General, 164 (1997) 1-11.

A. E. Aksoylu, A. N. Akin, S. G. Sunol, Z. I. Önsan, "The effect of metal loading on the adsorption parameters of carbon dioxide on coprecipitated nickel-alumina catalysts", Turkish Journal of Chemistry, 20(1) (1996) 88-94.

A. E. Aksoylu, A. N. Akin, Z. I. Önsan, D. L. Trimm, "Structure/activity relationships in coprecipitated nickel/alumina catalysts using CO2 adsorption and methanation", Applied Catalysis A: General, 145 (1996) 185-193.

Z. S. Gönenç, R. Yildirim, B. Beler-Baykal, Z. I. Önsan, "Adsorption parameters of some C5-C8 paraffinic hydrocarbons on platinum-alumina by gas chromatographic pulse techniques", Applied Catalysis A: General, 103 (1993) 35-42.

F. Kizilçeç, Z. I. Önsan, F. Borak, "Heat transfer coefficients in finned-coil stirred-tank systems", Canadian Journal of Chemical Engineering, 68 (1990) 1057-1060.

D. Aksan-Sizgek, F. Borak, Z. I. Önsan, "Heat transfer coefficients in coiled stirred-tank systems", Canadian Journal of Chemical Engineering, 65 (1987) 1013-1017.

Z. I. Önsan, D. L. Trimm, "The ammoxidation of propene and isobutene over an Sn-V-P oxides catalyst", Journal of Catalysis, 38(1-3) (1975) 257-263.

Bioreaction and Biosystems Engineering

P. Pir, B. Kirdar, A. Hayes, Z. I. Önsan, K. Ö. Ülgen, S. G. Oliver, "Exametabolic and transcriptional response in relation to phenotype and gene copy number in respiration-related deletion mutants of S. cerevisiae", Yeast, 25(9) (2008) 661-672.

D. Dikicioglu, P. Pir, Z. I. Önsan, K. Ö. Ülgen, S. G. Oliver, B. Kirdar, "Integration of metabolic modeling and phenotypic data in the evaluation and improvement of ethanol production using respiratory deficient mutants of Saccharomyces cerevisiae", Applied and Environmental Microbiology, 74(18) (2008) 5809-5816.

K. Y. Arga, Z. I. Önsan, B. Kirdar, K. Ö. Ülgen, J. Nielsen, "Understanding signaling in yeast: insights from network analysis", Biotechnology and Bioengineering, 97 (2007) 1246-1258.

T. Çakir, B. Kirdar, Z. I. Önsan, K. Ö. Ülgen, J. Nielsen, "Effect of carbon source perturbations on transcriptional regulation of metabolic fluxes in S. Cerevisiae", BMC Systems Biology 1 (2007) Article No. 18.

T. Çakir, K. R. Patil, Z. I. Önsan, K. Ö. Ülgen, B. Kirdar, J. Nielsen, "Integration of metabolome data with metabolic networks reveals reporter reactions", Molecular Systems Biology 2 (2006) Article No. 50.

P. Pir, B. Kirdar, A. Hayes, Z. I. Önsan, K. Ö. Ülgen, S. G. Oliver, "Integrative investigation of metabolic and transcriptomic data", BMC Bioinformatics, 7 (2006) Article No. 203.

P. Pir, K. Ö. Ülgen, A. Hayes, Z. I. Önsan, B. Kirdar, S. G. Oliver, "Annotation of unknown yeast ORFs by correlation analysis of microarray data and extensive literature searches", Yeast, 23 (2006) 553-571.

E. Toksoy Öner, B. Kirdar, Z. I. Önsan, K. Ö. Ülgen, "Modeling of the induced expression for high-level production of a foreign protein by recombinant E. coli under the control of the T7 phage promoter", Process Biochemistry, 39 (2003) 315-323.

M. M. Altintas, K. Ö. Ülgen, B. Kirdar, Z. I. Önsan, S. G. Oliver, "Optimal substrate feeding policy for fed-batch cultures of the recombinant S. cerevisiae expressing bifunctional fusion protein displaying amylolytic activities", Enzyme and Microbial Technology, 33(2-3) (2003) 262-269.

G. Birol, I. Birol, B. Kirdar, Z. I. Önsan, "Investigating the fermentation dynamics structure of recombinant yeast YPB-G", Computers and Chemical Engineering, 27(1) (2003) 45-54.

M. M. Altintas, K. Ö. Ülgen, B. Kirdar, Z. I. Önsan, S. G. Oliver, "Improvement of ethanol production from starch by recombinant yeast through manipulation of environmental factors", Enzyme and Microbial Technology, 31 (2002) 640-647.

E. Toksoy, Z. I. Önsan, B. Kirdar, "High level production of TaqI restriction endonuclease by three different expression systems in Escherichia coli cells using T7 phage promoter", Applied Microbiology and Biotechnology, 59(2-3) (2002) 239-245.

M. M. Altintas, B. Kirdar, Z. I. Önsan, K. Ö. Ülgen, "Cybernetic modeling of growth and ethanol production in a recombinant S. cerevisiae strain secreting a bifunctional protein", Process Biochemistry, 39(12) (2002) 1439-1445.

E. Toksoy, Z. I. Önsan, B. Kirdar, "Expression of a thermostable restriction endonuclease in recombinant E. coli cells and optimization of fermentation conditions", World Journal of Microbiology and Biotechnology, 18 (2002) 23-27.

K. Ö. Ülgen, B. Saygili, Z. I. Önsan, B. Kirdar, "Bioconversion of starch into ethanol by a recombinant S. cerevisiae strain YPG-AB", Process Biochemistry, 37(10) (2002) 1157-1168.

G. Birol, B. Kirdar, Z. I. Önsan, "A simple structured model for biomass and extracellular enzyme production with recombinant Saccharomyces cerevisiae YPB-G", Journal of Industrial Microbiology & Biotechnology, 29(3) (2002) 111-116.

M. M. Altintas, B. Kirdar, Z. I. Önsan, K. Ülgen, "Plasmid stability in a recombinant S. cerevisiae strain secreting a bifunctional fusion protein", Journal of Chemical Technology & Biotechnology, 76 (2001) 612-618.

E. Toksoy, Z. I. Önsan, B. Kirdar, "Effect of the co-expression of methyltransferase activity on extracellular production of TaqI restriction endonuclease in recombinant E. coli cells", Process Biochemistry, 37(5) (2001) 527-534.

C. Tamerler, K. Ülgen, B. Kirdar, Z. I. Önsan, "A structured model for intracellular EcoRI endonuclease by recombinant E. coli 294", Process Biochemistry, 36(7) (2001) 621-627.

C. Tamerler, Z. I. Önsan, B. Kirdar, "A comparative study on the recovery of EcoRI endonuclease from two different genetically modified strains of Escherichia coli", Turkish Journal of Chemistry, 25(1) (2001) 63-71.

G. Birol, Z. I. Önsan, B. Kirdar, "Studies on fermentation of recombinant yeast cells: stability and kinetics of biomass and protein production", Journal of Chemical Technology & Biotechnology, 75(8) (2000) 729-737.

E. Toksoy, P. H. Özdinler, Z. I. Önsan, B. Kirdar, "Extracellular production of TaqI endonuclease in E. coli", Biotechnology Techniques, 13(11) (1999) 803-808.

G. Birol, P. Doruker, B. Kirdar, Z. I. Önsan, K. Ülgen, "Mathematical description of ethanol fermentation by immobilised Saccharomyces cerevisiae", Process Biochemistry, 33(7) (1998) 763-771.

G. Birol, Z. I. Önsan, B. Kirdar, S. Oliver, "Ethanol production and fermentation characteristics of recombinant S. cerevisiae strains grown on starch", Enzyme and Microbial Technology, 22(1998) 672-677.

C. Yildir, Z. I. Önsan, B. Kirdar, "Optimization of starting time and period of induction and inducer concentration in the production of the restriction enzyme EcoRI from recombinant E. coli 294", Turkish Journal of Chemistry, 22(3) (1998) 221-226.


C. Papers in Other Journals/Books

Catalyst Technology and Reaction Engineering

A. N. Akin, Z. I. Önsan, "Turkish chemical industry and environmentally friendly technologies", Eurasian Chemico-Technological Journal, 3(4) (2001) 257-266.
Z. S. Gönenç, Z. I. Önsan, "Chromatographic study of the adsorption and reaction of hydrocarbons on a platinum-alumina reforming catalyst" in Recent Advances in Chemical Engineering (ed. D. N. Saraf, D. Kunzru), Tata-McGraw-Hill, New Delhi (1989) 266-271.
A. N. Akin, M. Arikol, Z. I. Önsan, "The effect of temperature and caustic soda concentration on bauxite digestion efficiency", Chimica Acta Turcica, 17(1) (1989) 21-29.
Z. S. Gönenç, Z. I. Önsan, "Chromatographic study of hydrogen adsorption on a commercial platinum-alumina reforming catalyst", Turkish Journal of Chemistry, 12(3) (1988) 248-254.
F. Özgülsen, F. Borak, Z. I. Önsan, "Design of optimal heat exchangers-2", Mühendis ve Makina Dergisi, 29 (1988) 26-32.
A. Z. Aroguz, Z. I. Önsan, "Pyrolysis of solid waste materials", Chimica Acta Turcica, 15(3) (1987) 415-429.
H. F. Berk, A. B. Beler, Z. I. Önsan, R. Kandiyoti, "The effects of coal utilization techniques on air pollution-1. Low temperature pyrolysis", Çevre Haberleri, 5 (1980) 33-37 (Environmental News - published by Bogaziçi University).
R. Kandiyoti, Z. I. Önsan, "The effects of coal utilization techniques on air pollution-1. Gasification Processes", Çevre Haberleri, 8 (1980) 15-23.
Z. I. Önsan, A. M. Erten, "Pyrolysis of cellulosic solid waste materials", Çevre Haberleri, 3 (1979) 17-22.
G. Alptekin, Z. I. Önsan, R. Kandiyoti, "Hydrodenitrogenation of pyridine over a cobalt molybdate catalyst", Bogaziçi University Journal, 7 (1979) 1-22.

Bioreaction and Biosystems Engineering

P. Doruker, Z. I. Önsan, B. Kirdar, "Ethanol fermentation by growing S. cerevisiae cells immobilized in small Ca-alginate beads", Turkish Journal of Chemistry, 19 (1995) 37-42.
K. Özergin, Y. Khoury, Z. I. Önsan, B. Kirdar, "The effect of immobilization on yeast cell growth and ethanol production", Turkish Journal of Chemistry, 17 (1993) 154-159.


CONFERENCE PRESENTATIONS:

F. Gökaliler, Z. I. Önsan, A. E. Aksoylu, "The Oxidative Steam Reforming (OSR) Performance of Pt-Ni/Al2O3 System with Mixed Propane-Methane Feed", AIChE Spring Meeting, 13-17 March, 2011, Chicago, USA.

Z. I. Önsan, "Laboratory Scale Catalyst Testing", 6th EFCATS Summer School, 13-18 September, 2010, Izmir, Turkey.

E. Simsek, A. K. Avci, Z. I. Önsan, "A Parametric Study of Syngas Production by Methane Steam Reforming", 6th EFCATS Summer School, 13-18 September, 2010, Izmir, Turkey.

R. M. Kircin, M. Karakaya, A. K. Avci, A. E. Aksoylu, Z. I. Önsan, "Modeling of a Catalytic Plate Reactor Producing Hydrogen for Fuel Processor Systems", XIX International Conference on Chemical Reactors, 5-9 September, 2010, Vienna, Austria.

F. Gökaliler, Z. I. Önsan, A. E. Aksoylu, "Power Type Rate Law for Propane ATR over a Pt-Ni/Al2O3 Catalyst", ACS Fall National Meeting, 22-26 August, 2010, Boston-USA.

S. Tuna, Ö. Sen, A. K. Avci, Z. I. Önsan, "Influence of Catalyst Properties and Feed Composition on WGS Reaction over Pt/Ceria Catalysts", 9th European Congress of Catalysis: EuropaCat-9, 30 August-4 September, 2009, Salamanca, Spain.

S. Acun, S. Özkara-Aydinoglu, A. E. Aksoylu, Z. I. Önsan, "Effect of Support Pretreatment on Kinetics of CO Oxidation over Activated Carbon Supported Pt-SnOx Catalysts", 3rd International Symposium on Carbon for Catalysis, 9-12 November, 2008, Berlin, Germany.

D. Hasdemir, Z. I. Önsan, J. Nielsen, B. Kirdar, "Interactome and Transcriptome Data to Reveal Glucose Repression Pathway in S. cerevisiae", 9th International Conference on Systems Biology, 23-27 August, 2008, Göteborg, Sweden.

Ö. Tan, E. Masalaci, Z. I. Önsan, A. K. Avci, "Simulation and Design of Methane-to-Hydrogen Converters for Driving PEMFCs", 14th International Congress on Catalysis", 12-18 July, 2008, Seoul, South Korea.

B. Gülyüz, A. E. Aksoylu, Z. I. Önsan, "Kinetics of Low Temperature CO Oxidation over Activated Carbon Supported Pt-ceria", 8th European Congress of Catalysis: EuropaCat-8, 26-31 August, 2007, Turku, Finland.

F. Soyal-Baltacioglu, A. E. Aksoylu, Z. I. Önsan, "Steam Reforming of Ethanol over Pt-Ni/Al2O3 Catalysts", 8th European Congress of Catalysis: EuropaCat-8, 26-31 August, 2007, Turku, Finland.

F. Gökaliler, B. S. Çaglayan, Z. I. Önsan, A. E. Aksoylu, "Fuel Flexibility of Bimetallic Pt-Ni Systems: Hydrogen Production from LPG Having Different C3:C4 Ratios", Scientific Advances in Fuel Cells Systems, Abstract Book, p. 3B.5, 13-14 September, 2006, Turin, Italy.

M. Karakaya, A. K. Avci, A. E. Aksoylu, Z. I. Önsan, "Dynamic Simulation of an Indirect Partial Oxidation Reactor for Methane Conversion to Hydrogen", Scientific Advances in Fuel Cells Systems, Abstract Book, p. 6-11, 13-14 September, 2006, Turin, Italy.

P. Pir, B. Kirdar, Z. I. Önsan, A. Hayes, K. Ö. Ülgen, S. G. Oliver, "An Investigation on Transcriptional Regulation of Central Carbon Metabolism in S. cerevisiae," Genomes to Systems Conference, Abstract Book, p. 64, 22-24 March, 2006, Manchester, UK.

T. Çakir, B. Kirdar, Z. I. Önsan, K. Ö. Ülgen, J. Nielsen, "Transcriptional Regulation of Metabolic Fluxes in Response to Carbon Shifts", Genomes to Systems Conference, Abstract Book, p. 61, 22-24 March, 2006, Manchester, UK.

D. Dikicioglu, P. Pir, Z. I. Önsan, K. Ö. Ülgen, B. Kirdar, S. G. Oliver, "Investigation of the Respiratory Pathway in S. cerevisiae Using Metabolic Data and Flux Balance Analysis", Genomes to Systems Conference, Abstract Book, p. 61, 22-24 March, 2006, Manchester, UK.

B. S. Çaglayan, F. Gökaliler, E. Örücü, Z. I. Önsan, A. E. Aksoylu, "Hydrogen production from propane, LPG and ethanol over Bimetallic Catalysts", 2nd European Hydrogen Energy Conference, 22-25 November, 2005, Zaragoza, Spain.

P. Pir, B. Kirdar, Z. I. Önsan, K. Ö. Ülgen, A. Hayes, S. G. Oliver, "Integration of Metabolome and Transcriptome Profiles from Perturbed Chemostats", 12th European Congress on Biotechnology, 21-25 August, 2005, Copenhagen, Denmark.

K. Y. Arga, Z. I. Önsan, B. Kirdar, J. Nielsen, K. Ö. Ülgen, "Structural Robustness of Protein Interaction Networks are due to Modularity", 12th European Congress on Biotechnology, 21-25 August, 2005, Copenhagen, Denmark.

T. Çakir, K. R. Patil, B. Kirdar, Z. I. Önsan, K. Ö. Ülgen, J. Nielsen, "Use of Metabolome Data and Metabolic Network Structure to Identify Reaction Significances", 12th European Congress on Biotechnology, 21-25 August, 2005, Copenhagen, Denmark.

E. Örücü, F. Gökaliler, A. E. Aksoylu, Z. I. Önsan, "Hydrogen Production by Ethanol Steam Reforming", International Hydrogen Energy Conference, 13-15 June, 2005, Istanbul, Turkey.

B. S. Çaglayan, F. Gökaliler, Z. I. Önsan, A. E. Aksoylu, "Indirect Partial Oxidation over Bimetallic Pt-Ni Catalyst: Production of Hydrogen from LPG", International Hydrogen Energy Conference, 13-15 June, 2005, Istanbul, Turkey.

E. Örücü, F. Gökaliler, A. E. Aksoylu, Z. I. Önsan, "Hydrogen Production by Ethanol Steam Reforming over Bimetallic Catalysts", 7th European Congress on Catalysis, EuropaCat 7, 28 August-1 September, 2005, Sofia, Bulgaria.

B. S. Çaglayan, F. Gökaliler, Z. I. Önsan, A. E. Aksoylu, "Autothermal Reforming of Propane over Pt-Ni Bimetallic Catalysts", 7th European Congress on Catalysis, EuropaCat 7, 28 August-1 September, 2005, Sofia, Bulgaria.

P. Pir, K. Ö. Ülgen, B. Kirdar, Z. I. Önsan, S. G. Oliver, "Integrated Analysis of Metabolome Profiles and Gene Expression in S. cerevisiae", 5th International Conference on Systems Biology, Abstract Book, pp. 146, 9-13 October, 2004, Heidelberg, Germany.

P. Pir, B. Kirdar, Z. I. Önsan, K. Ö. Ülgen, S. G. Oliver, "Analysis of Variance in Transcriptome Data from Perturbation Experiments", 5th International Conference on Systems Biology, Abstract Book, pp. 145, 9-13 October, 2004, Heidelberg, Germany.

B. Selen, S. Gürdag, Z. I. Önsan, A. E. Aksoylu, "Modification and Characterization of Activated Carbon and Its Use as the Support in Pt-Cu CO Oxidation Catalysts", International Symposium on Carbon for Catalysis (CarboCat 2004), 18-20 July, 2004, Lausanne, Switzerland.

E. Örücü, M. Karakaya, A. K. Avci, Z. I. Önsan, "Investigation of Ethanol Conversion for Hydrogen Fuel Cells Using Computer Simulations", 13th International Congress on Catalysis, 11-16 July, 2004, Paris, France.

G. Seçkin, A. N. Akin, Z. I. Önsan, R. Yildirim, "Design of Pt/MgO Catalysts for Low Temperature Oxidation of CO in Hydrogen-Rich Gas Streams", 13th International Congress on Catalysis, 11-16 July, 2004, Paris, France.

A. K. Avci, D. L. Trimm, A. E. Aksoylu, Z. I. Önsan, "Catalytic Combustion of Light Hydrocarbons under Fuel Rich Conditions", AIChE Annual Meeting, 16-21 November, 2003, San Francisco, USA.

B. Selen, A. K. Avci, Z. I. Önsan, A. E. Aksoylu, "Autothermal Reforming of Propane over Pt-Ni Bimetallic System", 6th European Congress on Catalysis, EuropaCat 6, 31 August-4 September, 2003, Innsbruck, Austria.

G. Seçkin, T. Ince, A. N. Akin, Z. I. Önsan, R. Yildirim, "Selective Low Temperature CO Oxidation over Supported Pt-Co-Ce Catalysts in Hydrogen-Rich Streams", 6th European Congress on Catalysis, EuropaCat 6, 31 August-4 September, 2003, Innsbruck, Austria.

E. Toksoy-Öner, B. Kirdar, Z. I. Önsan, K. Ülgen, "A Structured Model for High-Level Protein Production by Recombinant E. coli Cells", 3rd Eastern Mediterranean Chemical Engineering Conference (EMCC-3), 13-16 May, 2003, Salonica, Greece.

A. K. Avci, D. L. Trimm, A. E. Aksoylu, Z. I. Önsan, "Production of Hydrogen from Light Hydrocarbons via Indirect Partial Oxidation on Bimetallic Catalysts", 3rd Eastern Mediterranean Chemical Engineering Conference (EMCC-3), 13-16 May, 2003, Salonica, Greece.

A. K. Avci, A. E. Aksoylu, Önsan, Z. I., "Ignition Characteristics of Catalytic Propane and n-Butane Oxidation", Fuel Cells Science & Technology 2002, September 25-26, 2002, Amsterdam, The Netherlands.

A. K. Avci, D. L. Trimm, A. E. Aksoylu, Z. I. Önsan, "Catalytic Oxidation and Steam Reforming of Propane and n-Butane for Hydrogen Production", 224th ACS National Meeting, August 18-22, 2002, Boston, Massachusetts, USA.

S. Özkara, A. K. Uguz, Z. I. Önsan, A. E. Aksoylu, "Removal of CO in Hydrogen Streams by Low Temperature Catalytic Oxidation", 224th ACS National Meeting, August 18-22, 2002, Boston, Massachusetts, USA.

S. Özkara, A. E. Aksoylu, Z. I. Önsan, A. N. Akin, "Co-precipitated Co/Al2O3 Supported Pt Catalysts in Low Temperature CO Oxidation", UNIDO-ICS Workshop on Catalysis for Environmentally Friendly Processes and Products, 24-27 September, 2001, Istanbul, Turkey.

A. K. Avci, D. L. Trimm, Z. I. Önsan, "Reactor Modeling for Simulation of Catalytic Autothermal Conversion of Methane to Hydrogen", UNIDO-ICS Workshop on Catalysis for Environmentally Friendly Processes and Products, 24-27 September, 2001, Istanbul, Turkey.

A. K. Avci, D. L. Trimm, Z. I. Önsan, "Hydrogen Production for Fuel Cell Applications", UNIDO-ICS Workshop on Catalysis for Environmentally Friendly Processes and Products, 24-27 September, 2001, Istanbul, Turkey.

A. K. Avci, D. L. Trimm, Z. I. Önsan, "Reactor Modeling for Simulation of Catalytic Autothermal Conversion of Methane to Hydrogen", UNIDO-ICS Workshop on Catalysis for Environmentally Friendly Processes and Products, 24-27 September, 2001, Istanbul, Turkey.

S. Özkara, A. E. Aksoylu, Z. I. Önsan, A. N. Akin, "Low Temperature CO Oxidation Activity of Pt Supported on Co-precipitated Co/Al2O3", EUROPACAT V - 5th European Congress on Catalysis, September 2-7, 2001, Limerick, Ireland.

A. K. Avci, D. L. Trimm, Z. I. Önsan, "On-board conversion of alternative hydrocarbon fuels into hydrogen for vehicular fuel cell applications", EUROPACAT V - 5th European Congress on Catalysis, September 2-7, 2001, Limerick, Ireland.

A. I. Isli, A. K. Avci, S. Gürdag, Z. I. Önsan, A. E. Aksoylu, "Activated Carbon as a Support for Ni-Mo Catalysts Used in CO Hydrogenation", EUROPACAT V - 5th European Congress on Catalysis, September 2-7, 2001, Limerick, Ireland.

A. K. Avci, Z. I. Önsan, D. L. Trimm, "Hydrogen from Natural Gas for Mobile Fuel Cell Applications", 6th Natural Gas Conversion Symposium, 17-22 June, 2001, Alaska, USA.

S. Özkara, G. H. Güvelioglu, A. K. Uguz, A. N. Akin, A. E. Aksoylu, Z. I. Önsan, "Low Temperature CO Oxidation Activity of Pt Supported on Co-precipitated Co/Al2O3", Second Chemical Engineering Conference for Collaborative Research in Eastern Mediterranean, 20-24 May, 2001, Ankara, Turkey.

Z. I. Önsan, A. K. Avci, D. L. Trimm, "On-board Hydrogen Generation Systems for Fuel Cell Driven Vehicles", invited lecture in the Second Chemical Engineering Conference for Collaborative Research in Eastern Mediterranean, 20-24 May, 2001, Ankara, Turkey.

A. K. Avci, D. L. Trimm, Z. I. Önsan, "Conversion of Methanol and Gasoline to Hydrogen for Fuel Cell Vehicles", 1st EFCATS School on Catalysis, 27 March-1 April, 2001, Prague, Czech Republic.

A. N. Akin, A. K. Avci, A. E. Aksoylu, Z. I. Önsan, "Role of Catalysis in the Development of Cleaner Processes", UNIDO ICS Workshop on Catalytic Processes for Clean Chemistry and Water and Air Depollution, 19-22 November, 2000, Hammemet, Tunisia.

A. N. Akin, Z. I. Önsan, "Effect of Potassium Promotion on the CO Hydrogenation of Co-precipitated Cobalt Alumina Catalysts", Proceedings of the 9th International Symposium on Heterogeneous Catalysis (Eds: L. Petrov, Ch. Bonev, G. Kadinov), pp. 381-386, Institute of Catalysis, Bulgarian Academy of Sciences, 23-27 September, 2000, Varna, Bulgaria.

M. Dönmez, A. K. Avci, A. N. Akin, Z. I. Önsan, "Characterization of Co-precipitated Cobalt Alumina Catalysts by Thermogravimetric Analysis", Proceedings of the 9th International Symposium on Heterogeneous Catalysis (Eds: L. Petrov, Ch. Bonev, G. Kadinov), pp. 375-380, Institute of Catalysis, Bulgarian Academy of Sciences, 23-27 September, 2000, Varna, Bulgaria.

A. N. Akin, G. Kilaz, A. I. Isli, Z. I. Önsan, "Development and Characterization of Pt-SnO2/Al2O3 Catalysts", ISCRE 16 - 16th International Symposium on Chemical Reaction Engineering, September 10-13, 2000, Cracow, Poland.

A. K. Avci, D. L. Trimm, Z. I. Önsan, "Heterogeneous Reactor Modeling for Simulation of Catalytic Oxidation and Steam Reforming of Methane", ISCRE 16 - 16th International Symposium on  Chemical Reaction Engineering", September 10-13, 2000, Cracow, Poland.

E. Toksoy, Z. I. Önsan, B. Kirdar, "Comparison of Three Different TaqI Restriction-Modification Expression Systems in High Cell Density Cultures of Escherichia coli Using the T7 Phage Promoter System", ESBES-3, September 10-13, 2000, Copenhagen, Denmark.

M. M. Altintas, B. Kirdar, Z. I. Önsan, K. Ülgen, "Cybernetic Modeling of Starch Degradation by Recombinant Saccharomyces cerevisiae", ESBES-3, September 10-13, 2000, Copenhagen, Denmark.

E. Toksoy, Z. I. Önsan, B. Kirdar, "Effect of Methylase Protection on Extracellular TaqI Production in E. coli Cells", Biotechnology 2000, September 3-8, 2000, Berlin, Germany.

M. M. Altintas, B. Kirdar, Z. I. Önsan, K. Ülgen, "Bioreactor Operating Strategies for Alcohol Fermentation by Recombinant Yeast", Biotechnology 2000, September 3-8, 2000, Berlin, Germany.

T. Bülbül, A. I. Isli, A. E. Aksoylu, Z. I. Önsan, "Investigation of Alternative Support Materials for Monometallic and Bimetallic Catalysts of CO Hydrogenation", 12th International Congress on Catalysis", 9-14 July, 2000, Granada, Spain.

A. K. Avci, D. L. Trimm, Z. I. Önsan, "Simulation of Alternative Catalyst Bed Configurations in Autothermal Hydrogen Production", 12th International Congress on Catalysis", 9-14 July, 2000, Granada, Spain.

G. Kilaz, A. I. Isli, A. N. Akin, Z. I. Önsan, "A Parametric Study on Low Temperature CO Oxidation on Pt-SnO2/Al2O3 Catalysts", 4th European Congress on Catalysis - EUROPACAT-IV, 82, 5-10 September, 1999, Rimini, Italy.

B. E. Saygili, K. Ülgen, Z. I. Önsan, B. Kirdar, "Single Step Conversion of Starch to Ethanol by Recombinant S. cerevisiae", 9th European Congress on Biotechnology, 11-15 July, 1999, Brussels, Belgium.

A. E. Aksoylu, Z. I. Önsan, "Synergetic Interactions in Bimetallic Nickel Catalysts", American-Turkish-Israeli Tri-National Chemical Engineering Conference, 9-11 March, 1999, Haifa, Israel.

A. N. Akin, Z. I. Önsan, "Potassium Promotion of Co-precipitated Cobalt-Alumina Catalysts", American-Turkish-Israeli Tri-National Chemical Engineering Conference, 9-11 March, 1999, Haifa, Israel.

A. K. Avci, D. L. Trimm, Z. I. Önsan, "Reactor Modeling for Hydrogen Production by Catalytic Oxidation and Steam Reforming of Light Hydrocarbons", 48th Canadian Chemical Engineering Conference, 4-7 October, 1998, London-Ontario, Canada.

R. Karaselçuk, A. I. Isli, A. E. Aksoylu, Z. I. Önsan, "CO Hydrogenation over Bimetallic Nickel-Vanadium Catalysts", 48th Canadian Chemical Engineering Conference, 4-7 October, 1998, London-Ontario, Canada.

G. Birol, S. Savas, K. Ülgen, B. Kirdar, Z. I. Önsan, "Fermentation Characteristics of a Recombinant Saccharomyces cerevisiae Strain for the Conversion of Starch to Ethanol", 48th Canadian Chemical Engineering Conference, 4-7 October, 1998, London-Ontario, Canada.

E. Toksoy, P. H. Özdinler, Z. I. Önsan, B. Kirdar, "Extracellular Production of TaqI Endonuclease by a Recombinant Escherichia coli Strain", 48th Canadian Chemical Engineering Conference, 4-7 October, 1998, London-Ontario, Canada.

G. Birol, I. Birol, B. Kirdar, Z. I. Önsan, "Modeling of Recombinant Yeast Cells: Reduction of Phase Space", Proceedings of the 35th Rocky Mountain Bioengineering Symposium, 17-19 April, 1998, in Biomedical Sciences Instrumentation (Eds. S. F. Barrett and H. G. Wright), vol. 34, pp. 163-168.

A. E. Aksoylu, Z. I. Önsan, "The Effect of Mo on the Structure and Activity of Ni/Al2O3 Catalysts: Hydrogenation of Carbon Oxides", 3rd European Congress on Catalysis, 31 August-6 September, Cracow, Poland.

A. N. Akin, Z. I. Önsan, "Preparation and Characterization of Co-precipitated Co-Alumina Catalysts used for CO Hydrogenation", 3rd European Congress on Catalysis, 31 August-6 September, 1997, Cracow, Poland.

G. Birol, B. Kirdar, Z. I. Önsan, "A Comparison of Aerobic and Anaerobic Fermentation of Recombinant Yeast Cells Grown on Starch", 8th European Congress on Biotechnology, 17-21 August, 1997, Budapest, Hungary.

G. Birol, S. Savas, Z. I. Önsan, B. Kirdar, "Optimization of Fermentation Conditions for Recombinant S. cerevisiae Grown on Starch", 8th European Congress on Biotechnology, 17-21 August, 1997, Budapest, Hungary.

E. Toksoy, Z. I. Önsan, B. Kirdar, "Expression of MBP-Taq DNA Polymerase Fusion Protein: Optimization of Fermentation Conditions in a Batch System", 8th European Congress on Biotechnology, 17-21 August, 1997, Budapest, Hungary.

A. E. Aksoylu, A. N. Akin, Z. I. Önsan, "Hydrogenation of Carbon Oxides for the Production of C1-C4 Hydrocarbons Using Nickel and Cobalt-based Catalysts", NATO-ASI on "Advances and Challenges in the Catalytic Activation and Functionalization of Light Alkanes", 25 May-7 June, 1997, Algarve, Portugal.

A. E. Aksoylu, A. N. Akin, S. G. Sunol, Z. I. Önsan, "Preparation and Characterization of Co-precipitated Nickel-Alumina Catalysts", 35th IUPAC Congress, 1995, Istanbul, Turkey.

A. N. Akin, A. E. Aksoylu, S. G. Sunol, Z. I. Önsan, "Hydrocarbon Synthesis by Carbon Monoxide Hydrogenation on Co-precipitated Cobalt Catalysts", 35th IUPAC Congressi 1995, Istanbul, Turkey.

C. Yildir, Z. I. Önsan, B. Kirdar, "The Effect of Temperature Shift on Product Yield in E. coli containing pSCC2", 7th European Congress on Biotechnology, Abstract Book, vol. 2, p. 109, 19-23 February, 1995, Nice, France.

G. Birol, K. Ülgen, B. Kirdar, Z. I. Önsan, "Modeling of Fermentation by Yeast Cells", 7th European Congress on Biotechnology, Abstract Book, vol. 2, p. 109, 19-23 February, 1995, Nice, France.

C. Yildir, Z. I. Önsan, B. Kirdar, "Development of a Small Scale Procedure for the Purification of Restriction Enzymes", 10th Balkan Biochemical and Biophysical Days, 22-25 May, 1994, Varna, Bulgaria.

S. Gönenç, Z. I. Önsan, "Chromatographic Study of the Absorption and Reaction of Hydrocarbons on a Platium-Alumina Reforming Catalyst" in Recent Advances in Chemical Engineering (Eds. D. N. Saraf and D. Kunzru), Tata-McGrawhill, New Delhi (1989) 266-271.