Lump Kinetic Analysis of Syngas Composition Effect on Fischer-Tropsch Synthesis over Cobalt and Cobalt-Rhenium Alumina Supported Catalyst
<p>This study investigated lump kinetic analysis of Fischer-Tropsch synthesis over Cobalt and Cobalt-Rhenium Alumina supported catalyst (Co/γ-Al<sub>2</sub>O<sub>3</sub> and Co-Re/γ-Al<sub>2</sub>O<sub>3</sub>) at 20 bars and 483 K using feed gas with molar H<sub>2</sub>/CO ratios of 1.0 to 2.1. Syngas with H<sub>2</sub>/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 H<sub>2</sub>/CO ratio makes faster hydrogenation step and less-product dominated in the associative CO adsorption step and dissociative H<sub>2</sub> adsorption equilibrium step. Kinetic constant for hydrogenation step increases 73-421% in syngas with 2.1 H<sub>2</sub>/CO molar ratio compared to condition with 1.0 H<sub>2</sub>/CO molar ratio. Faster hydrogenation step (with higher kinetic constant) results in higher reactant conversion. Equilibrium constant for associative CO adsorption and dissociative H<sub>2</sub> adsorption step decreases 53-94% and 13-82%, respectively, in syngas with higher H<sub>2</sub>/CO molar ratio. Less product dominated reactant adsorption step (lower equilibrium constant for CO and H<sub>2</sub> adsorption step) gives higher CH<sub>4</sub> 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-Al<sub>2</sub>O<sub>3</sub> only gives effect as structural promoter, which only increases reactant conversion with the same product selectivity. Copyright © 2016 BCREC GROUP. All rights reserved</p><p class="HistoryArticleBCREC"><em>Received: 10<sup>th</sup> November 2015; Revised: 10<sup>th</sup> February 2016; Accepted: 16<sup>th</sup> February 2016</em></p><p><strong>How to Cite</strong>: Tristantini, D., Suwignjo, R.K. (2016). Lump Kinetic Analysis of Syngas Composition Effect on Fischer-Tropsch Synthesis over Cobalt and Cobalt-Rhenium Alumina Supported Catalyst.<em> Bulletin of Chemical Reaction Engineering & Catalysis</em>, 11 (1): 84-92. (doi:10.9767/bcrec.11.1.424.84-92)</p><p><strong>Permalink/DOI</strong>: <a href="http://dx.doi.org/10.9767/bcrec.11.1.424.84-92">http://dx.doi.org/10.9767/bcrec.11.1.424.84-92</a></p>
