Effect of Ce-promotion on iron catalysts activity through the synthesis of liquid fuels by the Fischer-Tropsch process

1st International Conference on Petroleum Technology and Petrochemicals

石油天然气工程

Al-Zuhairi, F.K.^1 ; Kadhim, W.A.^1

Petroleum Technology Department, University of Technology, Iraq^1

关键词: Fischer-Tropsch process;    Impregnation methods;    Iron-based catalyst;    Lower reaction temperature;    Product selectivities;    Reaction temperature;    Reduction temperatures;    Temperature-programmed reduction;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/579/1/012017/pdf
DOI  :  10.1088/1757-899X/579/1/012017

来源: IOP

【 摘 要 】

The main objective of this work is studying the effect of cerium promotion and reaction temperature on the catalysts activity and product selectivity, the iron-based catalysts utilized in this study were prepared by impregnation methods and characterized via temperature programmed reduction (TPR) and N2 adsorption-desorption isotherms. Reaction experiments were accomplished in a stainless steel fixed bed reactor. The reaction experiments for unpromoted and promoted catalysts were done at pressure 20 bar, space velocity 1400 h-1, H2/CO=2 and different reaction temperature (250, 275, 300 and 325 °C). The results have shown the addition of promoter to iron-based catalyst enhanced the reducibility of Fe2O3 through a shift down in reduction temperature, furthermore, for both catalysts, conversion of carbon monoxide (CO) and selectivities of undesired products (CO2, CH4, and C2-C4) were found to be increased whereas the selectivity of desired products (C5+) was decreased with increasing in a reaction temperature from 55.87 to 35.65% and from 73.03 to 61.59 % for unpromoted and Ce-promoted catalysts respectively. A higher selectivity for high molecules weight hydrocarbons was about 73.03% detected at lower reaction temperature (250C) when a promotion catalyst was used.