Evidence for rapid chain growth in the Fischer-Tropsch synthesis over iron and cobalt catalysts

1987 ◽  
Vol 91 (4) ◽  
pp. 929-937 ◽  
Author(s):  
Charles A. Mims ◽  
Larry E. McCandlish
Keyword(s):  
Tropsch Synthesis ◽  
Cobalt Catalysts ◽  
Chain Growth ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis

Modelling Laboratory Fischer-Tropsch Synthesis Using Cobalt Catalysts

2018 ◽  
Vol 16 (11) ◽  
Author(s):  
Luis A. Díaz-Trujillo ◽  
Gilberto Toledo-Chávez ◽  
Gladys Jiménez-García ◽  
Héctor Hernández-Escoto ◽  
Rafael Maya-Yescas
Keyword(s):  
Equilibrium Constants ◽  
Fixed Bed ◽  
Reaction Rates ◽  
Tropsch Synthesis ◽  
Cobalt Catalysts ◽  
Chain Growth ◽  
Single Event ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Heterogeneous Kinetics

AbstractThe main goal of this paper is to critically review current microkinetics available for Fischer-Tropsch synthesis (FTS) modelling, in order to propose the best way to follow this set of complex reactions; therefore a microkinetic model was developed for FTS, accomplishing surface chemistry, heterogeneous kinetics, and single-event previous development for Co-based catalysts. Model starts simulating CO activation on catalyst surface, and then formation of methane, ethane and subsequent chain growth. Reaction rates were derived following the formalism of Langmuir-Hinshelwood-Hougen-Watson (LHHW); surface steps were proposed in consequence of feasibility. Chain growth was modelled by single-event steps, taking into account geometrical conformation explicitly. Number of growth steps of 1-olefins was rectified as requiring one more active site than mechanisms proposed previously; it was found that formation of these olefins exhibits a fast drop in chain growth; this phenomenon is explained in terms of probable geometrical conformations that lead to the number of single events. Experimental results in literature about isothermal synthesis of hydrocarbons in the gasoline range were simulated in a fixed-bed laboratory reactor; thermodynamic consistency was derived from chemical equilibrium over all reactions occurring during FTS. Equilibrium constants were evaluated as function of Gibbs free energy, and partial pressures of reactants and products.

First-principles study of structure sensitivity of chain growth and selectivity in Fischer–Tropsch synthesis using HCP cobalt catalysts

2017 ◽  
Vol 7 (14) ◽  
pp. 2967-2977 ◽  
Author(s):  
Hai-Yan Su ◽  
Yonghui Zhao ◽  
Jin-Xun Liu ◽  
Keju Sun ◽  
Wei-Xue Li
Keyword(s):  
First Principles ◽  
Tropsch Synthesis ◽  
Structure Sensitivity ◽  
Cobalt Catalysts ◽  
Chain Growth ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Co Insertion ◽  
Insertion Mechanism ◽  
Methane Selectivity

Co (0001) prefers the CO insertion mechanism with high methane selectivity, but Co (101̄1) prefers the carbide mechanism with high C2-hydrocarbon selectivity.

Improvement of C–C Coupling Using SiC as a Support of Cobalt Catalysts in Fischer Tropsch Synthesis

2021 ◽  
Author(s):  
Gisele Westphalen ◽  
Maria A. S. Baldanza ◽  
Antônio José de Almeida ◽  
Vera Maria Martins Salim ◽  
Mônica Antunes Pereira da Silva ◽  
...  
Keyword(s):  
Tropsch Synthesis ◽  
Cobalt Catalysts ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis

Fischer–Tropsch Synthesis on SiC-Supported Cobalt Catalysts

2013 ◽  
Vol 56 (9-10) ◽  
pp. 730-736 ◽  
Author(s):  
A. Lillebø ◽  
S. Håvik ◽  
E. A. Blekkan ◽  
A. Holmen
Keyword(s):  
Tropsch Synthesis ◽  
Cobalt Catalysts ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Supported Cobalt Catalysts
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