An investigation of the kinetics and mechanism of Fischer–Tropsch synthesis on Fe–Co–Ni supported catalyst

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. Copyright © 2016 BCREC GROUP. All rights reservedReceived: 10th November 2015; Revised: 10th February 2016; Accepted: 16th February 2016How to Cite: 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. Bulletin of Chemical Reaction Engineering & Catalysis, 11 (1): 84-92. (doi:10.9767/bcrec.11.1.424.84-92)Permalink/DOI: <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>

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On the kinetics and mechanism of Fischer–Tropsch synthesis on a highly active iron catalyst supported on silica-stabilized alumina

Catalysis Today ◽

10.1016/j.cattod.2015.08.054 ◽

2016 ◽

Vol 261 ◽

pp. 67-74 ◽

Cited By ~ 11

Author(s):

Trent J. Okeson ◽

Kamyar Keyvanloo ◽

John S. Lawson ◽

Morris D. Argyle ◽

William C. Hecker

Keyword(s):

Iron Catalyst ◽

Tropsch Synthesis ◽

Kinetics And Mechanism ◽

Fischer Tropsch ◽

Fischer Tropsch Synthesis ◽

Highly Active ◽

Active Iron

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Effect of Co-Feeding Inorganic and Organic Molecules in the Fe and Co Catalyzed Fischer–Tropsch Synthesis: A Review

Catalysts ◽

10.3390/catal9090746 ◽

2019 ◽

Vol 9 (9) ◽

pp. 746 ◽

Cited By ~ 4

Author(s):

Adolph Anga Muleja ◽

Joshua Gorimbo ◽

Cornelius Mduduzi Masuku

Keyword(s):

Case Studies ◽

Organic Molecules ◽

Short Review ◽

Tropsch Synthesis ◽

Kinetics And Mechanism ◽

Polymerization Process ◽

Fischer Tropsch ◽

Fischer Tropsch Synthesis ◽

Product Distributions ◽

Inorganic And Organic

This short review makes it clear that after 90 years, the Fischer–Tropsch synthesis (FTS) process is still not well understood. While it is agreed that it is primarily a polymerization process, giving rise to a distribution of mainly olefins and paraffins; the mechanism by which this occurs on catalysts is still a subject of much debate. Many of the FT features, such as deactivation, product distributions, kinetics and mechanism, and equilibrium aspects of the FT processes are still subjects of controversy, regardless of the progress that has been made so far. The effect of molecules co-feeding in FTS on these features is the main focus of this study. This review looks at some of these areas and tries to throw some light on aspects of FTS since the inception of the idea to date with emphasis and recommendation made based on nitrogen, water, ammonia, and olefins co-feeding case studies.

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Role of the activation process on catalytic properties of iron supported catalyst in Fischer-Tropsch synthesis

Journal of the Energy Institute ◽

10.1016/j.joei.2019.06.008 ◽

2020 ◽

Vol 93 (2) ◽

pp. 565-580 ◽

Cited By ~ 2

Author(s):

Pawel Mierczynski ◽

Bartosz Dawid ◽

Karolina Chalupka ◽

Waldemar Maniukiewicz ◽

Izabela Witonska ◽

...

Keyword(s):

Catalytic Properties ◽

Supported Catalyst ◽

Tropsch Synthesis ◽

Activation Process ◽

Fischer Tropsch ◽

Fischer Tropsch Synthesis

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Cobalt Carbonyl Cluster as Catalyst Precursor for Fischer-Tropsch Synthesis

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.236-238.684 ◽

2011 ◽

Vol 236-238 ◽

pp. 684-688

Author(s):

Feng Hua Bai ◽

Yin Xia Zhang ◽

Hai Quan Su ◽

Xue Fen Li ◽

Hui Pan ◽

...

Keyword(s):

Supported Catalyst ◽

Tropsch Synthesis ◽

Chain Growth ◽

Cobalt Metal ◽

Catalyst Precursor ◽

Distribution Analysis ◽

Carbonyl Cluster ◽

Cobalt Carbonyl ◽

Fischer Tropsch ◽

Fischer Tropsch Synthesis

The effect of precursors of Co/γ-Al2O3 catalysts prepared from Co(NO3)2 and (CO)6Co2CC(COOH)2 on the Fischer-Tropsch synthesis (FTS) catalytic performance were investigated. All catalysts were characterised by TGA, BET, pore size distribution analysis and TEM techniques. For Aluminium-supported catalyst, the use of cobalt carbonyl cluster as cobalt precursor resulted in a higher activity and C5+ selectivities compared with the reference catalyst prepared from nitrate at low reaction temperature. The activities can be correlated with the zero valent cobalt metal exist on the support. The chain growth attribute to well dispersed smaller metallic cobalt particles resulted from the partial removal of terminal carbonyls at 150°C.

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