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Citation: ZHANG Cheng-Hua, YANG Yong, TAO Zhi-Chao, LI Ting-Zhen, WAN Hai-Jun, XIANG Hong-Wei, LI Yong-Wang. Effects of Cu and K on Co-precipitated FeMn/SiO2 Catalysts for Fischer-Tropsch Synthesis[J]. Acta Physico-Chimica Sinica, ;2006, 22(11): 1310-1316. doi: 10.1016/S1872-1508(06)60064-8 shu

Effects of Cu and K on Co-precipitated FeMn/SiO2 Catalysts for Fischer-Tropsch Synthesis

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China; Graduate School of the Chinese Academy of Sciences, Beijing 100049, P. R. China

Received Date: 4 April 2006
Available Online: 6 November 2006

The effects of copper and potassium on the activity and selectivity of coprecipitated Fe-Mn/SiO2 catalysts for Fischer-Tropsch (F-T) synthesis were studied in a slurry phase continuous stirred tank reactor. The reduction and adsorption behaviors of the catalysts were investigated using temperature programmed reduction/temperature programmed desorption (TPR/TPD) methods. It was found that copper improves the reduction of the catalyst in H2 or CO. Potassium improves the reduction of the catalyst in CO, whereas it suppresses the reduction of the catalyst in H2. Copper enhances the H2 adsorption, whereas potassium has no influence on the H2 adsorption. In the F-T synthesis reaction, copper shortens the induction period required for reaching the steady state activity, whereas potassium prolongs the induction period. The potassium promoter increases the activity and decreases the selectivity of methane. The promotion effects of Cu and K on the activity and selectivity is more obvious than that of Cu, that is, the activity is higher and the methane selectivity is lower on the doubly promoted catalyst.
- Fischer-Tropsch synthesis;Fe-Mn catalyst;Copper;Potassium;Hydrocarbon distribution
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沈阳化工大学材料科学与工程学院沈阳 110142

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