Studies on product distribution of nanostructured iron catalyst in Fischer–Tropsch synthesis: Effect of catalyst particle size

2014 ◽  
Vol 20 (2) ◽  
pp. 591-596 ◽  
Author(s):  
Ali Nakhaei Pour ◽  
Mohammad Reza Housaindokht
Keyword(s):  
Particle Size ◽  
Iron Catalyst ◽  
Catalyst Particle ◽  
Product Distribution ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Catalyst Particle Size

Activation Energies for Chain Growth Propagation and Termination in Fischer–Tropsch Synthesis on Iron Catalyst as a Function of Catalyst Particle Size

2016 ◽  
Vol 41 (4) ◽  
pp. 371-384 ◽  
Author(s):  
Ali Nakhaei Pour ◽  
Fatemeh Dolati
Keyword(s):  
Particle Size ◽  
Iron Catalyst ◽  
Catalyst Particle ◽  
Tropsch Synthesis ◽  
Chain Growth ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Catalyst Particle Size ◽  
Partial Pressures ◽  
Hydrocarbon Product

The influence of the catalyst particle size in determining Fischer–Tropsch synthesis (FTS) performance for nano-structured iron catalysts was investigated. The catalysts were prepared by a microemulsion method and to achieve a series of catalysts with different iron particle size, the water-to-surfactant molar ratio (W/S) in the microemulsion system varied from 4 to 12. The results demonstrate that by decreasing the levels of active phase of the iron catalyst, the termination rates for chain growth are increased compared to the propagation rates. In addition, the activation energy for chain propagation is lower than for chain termination, and this difference (Et – Ep) for the hydrocarbon product distributions which is characterised by α1, is lower than the hydrocarbon product distribution which is characterised by α2 The results indicate the H2 concentration on the catalyst surface is decreased by increasing the catalyst particle size. Thus, the dependence of α (α1, and/or α2) on H2 partial pressures is increased by decreasing of catalyst particle size and the dependence of α2 on H2 partial pressures is weaker than for α1.

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