Theoretical analysis of oxidative coupling of methane and Fischer Tropsch synthesis in two consecutive reactors: Comparison of fixed bed and membrane reactor

2013 ◽  
Vol 19 (6) ◽  
pp. 1811-1826 ◽  
Author(s):  
Abbas Ghareghashi ◽  
Sattar Ghader ◽  
Hassan Hashemipour
Keyword(s):  
Theoretical Analysis ◽  
Oxidative Coupling ◽  
Membrane Reactor ◽  
Fixed Bed ◽  
Oxidative Coupling Of Methane ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis

scholarly journals Effect of Cobalt Catalyst Confinement in Carbon Nanotubes Support on Fischer-Tropsch Synthesis Performance

Symmetry ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 572 ◽  
Author(s):  
Omid Akbarzadeh ◽  
Noor Mohd Zabidi ◽  
Yasmin Abdul Wahab ◽  
Nor Hamizi ◽  
Zaira Chowdhury ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Fixed Bed ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Cobalt Oxide Nanoparticles ◽  
Co Conversion ◽  
Multi Walled Carbon Nanotubes ◽  
Pre Treatment ◽  
The Stability

Pre-treating the multi-walled carbon nanotubes (CNTs) support by refluxing in 35 vol% nitric acid followed by heating at the temperature of 600 to 900 °C resulted in the formation of defects on the CNTs. Increasing the temperature of the pre-treatment of the CNTs from 600 °C to 900 °C, enhanced the fraction of cobalt-oxide nanoparticles encapsulated in the channels of CNTs from 31% to 70%. The performance of Co/CNTs in Fischer-Tropsch synthesis (FTS) was evaluated in a fixed-bed micro-reactor at a temperature of 240 °C and a pressure of 2.0 MPa. The highest CO conversion obtained over Co/CNTs.A.900 was 59% and it dropped by ~3% after 130 h of time-on-stream. However, maximum CO conversion using Co/CNTs.A.600 catalysts was 28% and it decreased rapidly by about 54% after 130 h of time-on-stream. These findings show that the combined acid and thermal pre-treatment of CNTs support at 900 °C has improved the stability and activity of the Co/CNTs catalyst in FTS.

Effect of CO Conversion on the Product Distribution of a Co/Al2O3 Fischer–Tropsch Synthesis Catalyst Using a Fixed Bed Reactor

2012 ◽  
Vol 142 (11) ◽  
pp. 1382-1387 ◽  
Author(s):  
Dragomir B. Bukur ◽  
Zhendong Pan ◽  
Wenping Ma ◽  
Gary Jacobs ◽  
Burtron H. Davis
Keyword(s):  
Fixed Bed ◽  
Product Distribution ◽  
Tropsch Synthesis ◽  
Fixed Bed Reactor ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Co Conversion

Multiscale and Multiphase Model of Fixed-Bed Reactors for Fischer–Tropsch Synthesis: Optimization Study

2018 ◽  
Vol 57 (9) ◽  
pp. 3149-3162 ◽  
Author(s):  
Marko Stamenić ◽  
Vladimir Dikić ◽  
Miloš Mandić ◽  
Branislav Todić ◽  
Dragomir B. Bukur ◽  
...  
Keyword(s):  
Fixed Bed ◽  
Tropsch Synthesis ◽  
Multiphase Model ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Fixed Bed Reactors ◽  
Optimization Study

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.

Optimization of forced periodic operations in milli-scale fixed bed reactor for Fischer-Tropsch synthesis

2020 ◽  
Vol 343 ◽  
pp. 156-164
Author(s):  
Nikola Nikačević ◽  
Branislav Todić ◽  
Miloš Mandić ◽  
Menka Petkovska ◽  
Dragomir B. Bukur
Keyword(s):  
Fixed Bed ◽  
Tropsch Synthesis ◽  
Fixed Bed Reactor ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis
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