Understanding the Effect of Cobalt Particle Size on Fischer−Tropsch Synthesis: Surface Species and Mechanistic Studies by SSITKA and Kinetic Isotope Effect†

Langmuir ◽  
2010 ◽  
Vol 26 (21) ◽  
pp. 16558-16567 ◽  
Author(s):  
Jia Yang ◽  
Erik Z. Tveten ◽  
De Chen ◽  
Anders Holmen
Keyword(s):  
Particle Size ◽  
Isotope Effect ◽  
Kinetic Isotope Effect ◽  
Tropsch Synthesis ◽  
Surface Species ◽  
Mechanistic Studies ◽  
Fischer Tropsch ◽  
Cobalt Particle ◽  
Fischer Tropsch Synthesis ◽  
Kinetic Isotope

scholarly journals Investigation of C1 + C1 Coupling Reactions in Cobalt-Catalyzed Fischer-Tropsch Synthesis by a Combined DFT and Kinetic Isotope Study

Catalysts ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 551 ◽  
Author(s):  
Yanying Qi ◽  
Jia Yang ◽  
Anders Holmen ◽  
De Chen
Keyword(s):  
Isotope Effect ◽  
Thermodynamic Stability ◽  
Kinetic Isotope Effect ◽  
Theoretical Calculations ◽  
Tropsch Synthesis ◽  
Chain Growth ◽  
Coupling Reactions ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Kinetic Isotope

Understanding the chain growth mechanism is of vital importance for the development of catalysts with enhanced selectivity towards long-chain products in cobalt-catalyzed Fischer-Tropsch synthesis. Herein, we discriminate various C1 + C1 coupling reactions by theoretical calculations and kinetic isotope experiments. CHx(x=0−3), CO, HCO, COH, and HCOH are considered as the chain growth monomer respectively, and 24 possible coupling reactions are first investigated by theoretical calculations. Eight possible C1 + C1 coupling reactions are suggested to be energetically favorable because of the relative low reaction barriers. Moreover, five pathways are excluded where the C1 monomers show low thermodynamic stability. Effective chain propagation rates are calculated by deconvoluting from reaction rates of products, and an inverse kinetic isotope effect of the C1 + C1 coupling reaction is observed. The theoretical kinetic isotope effect of CO + CH2 is inverse, which is consistent with the experimental observation. Thus, the CO + CH2 pathway, owing to the relatively lower barrier, the high thermodynamic stability, and the inverse kinetic isotope effect, is suggested to be a favorable pathway.

Studies of Cobalt Particle Size Effects on Fischer-Tropsch Synthesis over Core-Shell-Structured Catalysts

ChemCatChem ◽  
2013 ◽  
Vol 5 (12) ◽  
pp. 3794-3801 ◽  
Author(s):  
Bo Zeng ◽  
Bo Hou ◽  
Litao Jia ◽  
Jungang Wang ◽  
Congbiao Chen ◽  
...  
Keyword(s):  
Particle Size ◽  
Size Effects ◽  
Tropsch Synthesis ◽  
Core Shell ◽  
Fischer Tropsch ◽  
Cobalt Particle ◽  
Fischer Tropsch Synthesis ◽  
Particle Size Effects ◽  
Structured Catalysts

Direct synthesis of Co@Al-MCM-41 catalyst from conventional Co/SiO2 catalyst

RSC Advances ◽  
2015 ◽  
Vol 5 (77) ◽  
pp. 62931-62935 ◽  
Author(s):  
Jiang-Yong Liu ◽  
Jian-Feng Chen ◽  
Yi Zhang
Keyword(s):  
Particle Size ◽  
High Selectivity ◽  
Direct Synthesis ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Cobalt Particle ◽  
Fischer Tropsch Synthesis ◽  
Zeolite P ◽  
Mcm 41 ◽  
Excellent Stability

A Co@Al-MCM-41 catalyst directly synthesized from Co/SiO2 realized high selectivity of gasoline in Fischer–Tropsch synthesis with excellent stability due to suitable cobalt particle size and acidity of zeolite.

Effect of Cobalt Particle Size on the Catalyst Intrinsic Activity for Fischer–Tropsch Synthesis

2013 ◽  
Vol 144 (3) ◽  
pp. 389-394 ◽  
Author(s):  
Khalid Azzam ◽  
Gary Jacobs ◽  
Wenping Ma ◽  
Burtron H. Davis
Keyword(s):  
Particle Size ◽  
Tropsch Synthesis ◽  
Intrinsic Activity ◽  
Fischer Tropsch ◽  
Cobalt Particle ◽  
Fischer Tropsch Synthesis
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