Effects of Catalytic Site Position on the Performance and Lifetime of Carbon Nanotubes Supported Cobalt Fischer-Tropsch Synthesis Nano Catalyst

2012 ◽  
Vol 2 (3) ◽  
pp. 272-285 ◽  
Author(s):  
Ahmad Tavasoli ◽  
Parviz Rashidi Ranjbar ◽  
Maryam Farahmandi ◽  
Hamideh Nikookar
Keyword(s):  
Carbon Nanotubes ◽  
Catalytic Site ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Nano Catalyst

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.

Fischer–Tropsch synthesis on mono- and bimetallic Co and Fe catalysts supported on carbon nanotubes

2009 ◽  
Vol 90 (12) ◽  
pp. 1486-1494 ◽  
Author(s):  
Ahmad Tavasoli ◽  
Mariane Trépanier ◽  
Reza M. Malek Abbaslou ◽  
Ajay K. Dalai ◽  
Nicolas Abatzoglou
Keyword(s):  
Carbon Nanotubes ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Fe Catalysts

Cobalt supported on carbon nanotubes — A promising novel Fischer–Tropsch synthesis catalyst

2008 ◽  
Vol 89 (5) ◽  
pp. 491-498 ◽  
Author(s):  
A. Tavasoli ◽  
K. Sadagiani ◽  
F. Khorashe ◽  
A.A. Seifkordi ◽  
A.A. Rohani ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis

scholarly journals Intrinsic Kinetics of Fischer–Tropsch Synthesis over Co/CNTs Catalysts: Effects of Support Interaction

2018 ◽  
Vol 43 (3-4) ◽  
pp. 262-273
Author(s):  
Behnam Hatami ◽  
Ahmad Tavasoli ◽  
Alireza Asghari ◽  
Yahya Zamani ◽  
Akbar Zamaniyan
Keyword(s):  
Carbon Nanotubes ◽  
Hydrogen Adsorption ◽  
Catalyst Support ◽  
Spillover Effect ◽  
Tropsch Synthesis ◽  
Cobalt Catalysts ◽  
High Dispersion ◽  
Impregnation Method ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis

The activities of cobalt catalysts prepared by the microemulsion impregnation method on carbon nanotubes (CNTs) and functionalised carbon nanotubes (FCNTs) supports were evaluated in the Fischer–Tropsch synthesis (FTS). The catalysts were characterised by transmission electron microscopy, X-ray diffraction and Brunauer–Emmett–Teller surface area methods. The results show that the cobalt particles in the FCNTs support are mostly located inside the tubes of the CNTs and show a narrower particle size distribution. The experimental results show that the cobalt catalyst supported on FCNTs leads to a higher CO conversion and FTS activity compared to that supported on normal CNTs. Calculated kinetic results show that the activation energies fall within the narrow range of 101.1–107.1 kJ mol−1 and the heat of hydrogen adsorption was calculated to be −40.2 and −26.2 kJ mol−1 for Co/CNTs and Co/FCNTs catalysts respectively. FCNTs, as a catalyst support of Co nanoparticles, maintain high dispersion which can be attributed to a hydrogen spillover effect of functional groups on the CNT surface.

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