EFFECT OF REACTION CONDITIONS ON THE CATALYTIC PERFORMANCE OF FE-MN CATALYST FOR FISCHER-TROPSCH SYNTHESIS

摘要

The synthesis of liquid fuels from coal-derived syngas via Fischer-Tropsch synthesis reaction is one of the most important processes to solve the shortage of transport fuels. Iron-based catalysts have been used as commercial catalysts for Fischer-Tropsch synthesis to produce a wide range of paraffin and olefin products, ranging from methane to high molecular weight waxes. It had been reported by Buessemeier [1] firstly that the higher selectivities of lower carbon olefins can be obtained on the Fe-Mn catalysts, which can be used as high quality fuels for motor vehicles reformed by molecular sieves as well as petrochemical substitution. Maiti et al. [2] studied a series of Fe-Mn catalysts and found that the catalyst which has low content of Mn and high reduction degree has higher activity during the initial period of the run process, and small amounts of Mn can enhance the formation of olefin products. Zhong et al. [3] exploited a novel Fe-Mn catalyst which had been prepared by a special degradation method. This catalyst shows good activity and stability which has been extensively studied in fixed bed reactor and slurry phase reactor [4, 5]. The performance of this catalyst has not been reported in a spinning basket reactor. In a continuous spinning basket reactor, the reaction environment is uniform all over the reactor. Thus it can provide more favorable information of the intrinsic properties of the reaction. The main objective of this work is to systematically examine the catalytic performance of the Fe-Mn catalyst in spinning basket reactor and compare it with that in fixed bed reactor.