DOI: https://doi.org/10.9767/bcrec.11.1.424.84-92

Lump Kinetic Analysis of Syngas Composition Effect on Fischer-Tropsch Synthesis over Cobalt and Cobalt-Rhenium Alumina Supported Catalyst

Chemical Engineering Department, Universitas Indonesia, Depok 16424, Indonesia

Received: 10 Nov 2015; Revised: 10 Feb 2016; Accepted: 10 Feb 2016; Available online: 10 Mar 2016; Published: 1 Apr 2016.
Editor(s): BCREC JM
Open Access Copyright (c) 2016 by Authors, Published by BCREC Group under http://creativecommons.org/licenses/by-sa/4.0.

Citation Format:
Cover Image
Abstract

This study investigated lump kinetic analysis of Fischer-Tropsch synthesis over Cobalt and Cobalt-Rhenium Alumina supported catalyst (Co/γ-Al2O3 and Co-Re/γ-Al2O3) at 20 bars and 483 K using feed gas with molar H2/CO ratios of 1.0 to 2.1. Syngas with H2/CO molar ratio of 1.0 represents syngas characteristic derived from biomass, while the 2.1 molar ratio syngas derived from coal. Rhenium was used as the promoter for the cobalt catalyst. Isothermal Langmuir adsorption mechanism was used to build kinetic model. Existing kinetic model of Fischer-Tropsch synthesis over cobalt alumina supported catalysts only valid for operating pressure less than 10 bar. CO insertion mechanism with hydrogenation step of catalyst-adsorbed CO by catalyst-adsorbed H component as the rate-limiting step is valid for operating condition in this research. Higher H2/CO ratio makes faster hydrogenation step and less-product dominated in the associative CO adsorption step and dissociative H2 adsorption equilibrium step. Kinetic constant for hydrogenation step increases 73-421% in syngas with 2.1 H2/CO molar ratio compared to condition with 1.0 H2/CO molar ratio. Faster hydrogenation step (with higher kinetic constant) results in higher reactant conversion. Equilibrium constant for associative CO adsorption and dissociative H2 adsorption step decreases 53-94% and 13-82%, respectively, in syngas with higher H2/CO molar ratio. Less product dominated reactant adsorption step (lower equilibrium constant for CO and H2 adsorption step) gives higher CH4 product selectivity, which occurred on 2.1 molar ratio of syngas. Rhenium (Re) metal on cobalt catalyst with composition 0.05%Re-12%Co/γ-Al2O3 only gives effect as structural promoter, which only increases reactant conversion with the same product selectivity. 

Fulltext View|Download
Keywords: Fischer-Tropsch; lump kinetic-model; reaction mechanism; syngas composition; structural promoter

Article Metrics:

Article Info
Section: The 2nd International Conference on Chemical and Material Engineering 2015
Recent articles
Lump Kinetic Analysis of Syngas Composition Effect on Fischer-Tropsch Synthesis over Cobalt and Cobalt-Rhenium Alumina Supported Catalyst Electro-oxidation of Ethanol on Carbon Supported PtSn and PtSnNi Catalysts Selective Hydrogenation of Biomass-derived Furfural over Supported Ni3Sn2 Alloy: Role of Supports Controlled Synthesis of Silver Nanoparticles Using Double Reductants and Its Voltammetric Characteristics Study Analysis of Chemical Reaction Kinetics Behavior of Nitrogen Oxide During Air-staged Combustion in Pulverized Boiler The Catalytic Degradation Performance of α-FeOOH Doped with Silicon on Methyl Orange Preface, BCREC Vol. 11 No. 1 Year 2016 Front-matter Back-matter More recent articles
  1. Abimanyu, H. (2013). A Pilot Scale Production of Fuel Grade Bioethanol from Lignocellulosic Biomass. In Presentasi SST Forum 2013, 5-6. Jakarta : Lembaga Ilmu Pengetahuan Indonesia
  2. Ariyono, B.G. (2011). Indonesian Coal Resource Development and Future Direction of Coal Export. In Presentasi International Symposium Clean Coal Day, 3-5 Jakarta : Departemen Energi dan Sumber Daya Mineral
  3. Chaudari, S.T., Bej, S.K., Bakhshi, N.N., Dalai, A.K. (2001). Steam Gasification of Biomass-Derived Char for the Production of Carbon Monoxide-Rich Synthesis Gas. Energy & Fuels, 15 : 736-742
  4. Zhang, J., Chen, J., Ren, J., Li, Y., Sun, Y. (2003). Support Effect of Co/Al2O3 Catalysts for Fischer-Tropsch Synthesis. Fuel, 82(5): 581-586
  5. Storsæter, S., Borg, Ø, Blekkan, E.A., Holmen, A. (2005). Study of the Effect of Water on Fischer-Tropsch Synthesis over Supported Cobalt Catalysts. Journal of Catalysis, 231(2): 405-419
  6. Asadullah, M., Ito, S., Kunimori, K., Yamada, M., Tomishige, K. (2002). Biomass Gasification to Hydrogen and Syngas at Low Temperature : Novel Catalytic System Using Fluidized-Bed Reactor.Journal of Catalysis, 208(2) : 255-259
  7. Tristantini, D., Logdberg, S., Gevert, B., Borg, Ø., Holmen, A. (2006). Direct Use of H2-Poor Bio-Syngas Model In Fischer-Tropsch Synthesis over Un Promoted and Rhenium-Promoted Alumina-Supported Cobalt Analysis. In Symposia American Chemical Society Division of Fuel Chemistry 2006 ISSN: 521-48-48: 15-20
  8. Cornils, B., Herrmann, W.A., Schlogl, R., Wong, C.H. (2000). Catalysis from A to Z, A Concise Encyclopedia, Weinhem: Wiley-VCH
  9. Todic, B., Olewski, T., Nikacevic, N., Bukur, D.B. (2013). Modeling of Fischer-Tropsch Product Distribution over Fe-Based Catalyst. Chemical Engineering Transactions, 32: 793-798
  10. Mansouri, M., Atashi, H., Mirzaei, A.A., Jangi, R. (2012). Kinetics of the Fischer-Tropsch Synthesis on Silica-Supported Cobalt-Cerium Catalyst. International Journal of Industrial Chemistry, 4(1): 1-10
  11. Mansouri, M., Atashi, H., Mirzaei, A.A., Karimi, M. (2012). Hydrogenation of CO on Cobalt Catalyst in Fischer-Tropsch Synthesis. Thermodynamics and Catalysis,3(2): 1-5
  12. Ojeda, M., Nabar, R., Nilekar, A.U., Ishikawa, A., Mavrikakis, M., Iglesia, E. (2010). CO Activation Pathways and the Mechanism of Fischer-Tropsch Synthesis. Journal of Catalysis, 272(1): 287-297
  13. Visconti, C.G., Tronconi, E., Lietti, L., Zennaro, R., Forzatti, P. (2007). Development of a Complete Kinetic Model for the Fischer-Tropsch Synthesis over Co/Al2O3 Catalysts. Chemical Engineering Science, 62: 5338-5343
  14. Jacobs, G., Ma, W., Davis, B.H. (2014). Influence of Reduction Promoters on Stability of Cobalt/𝛾-Alumina Fischer-Tropsch Synthesis Catalysts. Catalysts, 4(1 : 49-76
  15. Bazin, D., Guczi, L. (2004). A Review of In Situ XAS Study of Fischer-Tropsch Co based Catalysts. Studies in Surface Science and Catalysis, 147(1): 343-348

Last update:

No citation recorded.

Last update:

No citation recorded.