Study on Fused Iron Catalysts for Fischer-Tropsch Synthesis

　　Study on Fused Iron Catalysts for Fischer-Tropsch Synthesis
　　The Fischer-Tropsch synthesis (FTS) offers the potential of converting syngas into high value chemicals. Although several metals are active for the FTS, only iron and cobalt catalysts appear economically feasible on an industrial scale. Controlling selectivity is an important aspect of FTS catalyst development, depending on promoters and the process conditions employed.The precursors、promoters、reaction conditions and son were studyed in this paper, and characterized by means of XRD, TPR, BET, and TPD and so on to provide better insight into the relationship therein. Main results from this work were as follows.It was found that there was little effect of Magnetic lifter different precursor for the conversion of Fischer-Tropsch synthesis. The lower CH4 and CO2 were produced by the precursor of Fe3O4 - FeO coexisted, the CO adsorption was better, but the H2 adsorption was not good, it was maybe the more K contents on the surface.With K added the carbon number distribution was presented by two values of a. With the increase of Potassium content, the adsorption of CO was enhanced, the beginning reduction temperature of the catalysts was decreased, carbonization of catalyst was enhanced, The interactions of Al、Ca、Fe were also enhanced, the conversion was increased at first and then flattened out at high conversion levels, especially the formation of methane http://www.999magnet.com was suppressed, but carbon deposition was increased, the selectivity of olefins and higher molecular weight products were enhanced and the WGS reaction was facilitated.As the structural promoters Al2O3, CaO, which were no effect on the F-T synthesis conversion, the effect of K was weakened, WGS reaction was restrained by added CaO. To some extent, the addition of rare earth oxide, then the FexC phase of the XRD patters was increased.The study of reaction conditions indicated that the lower temperature, H2/CO ration and lower pace velocity, the formation of methane was greatly suppressed, but the pressure was not clearly. The partile size decreased to 0.1 mm, the internal diffusion was eliminated.