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研究了Cu、K助剂对共沉淀型FeMn／SiO2催化剂还原行为、吸附行为及费托(F-T)合成活性和选择性的影响．Cu助剂以与Fe、Mn、SiO2共沉淀的方式引入,而K助剂是在喷雾干燥前均匀加入沉淀浆料引入的．结果表明,Cu可明显提高催化剂的还原性能,K助剂能促进催化剂在CO中的还原但抑制在H2中的还原,而同时加入Cu和K会进一步促进催化剂在H2或CO中的还原;Cu助剂能促进H2吸附而K助剂对H2吸附无明显影响;Cu在一定程度上提高了F-T合成活性,缩短了反应诱导期,K明显促进了CO的转化而相对抑制了H2的转化,并且延长了反应的诱导期,Cu与K协同作用不仅提高反应的转化率而且缩短了反应的诱导期;K使得烃产物平均分子量增加,Cu单独对烃产物分布影响不明显,而与K共同作用会进一步增加烃产物的分子量．
The effects of Cu and K promoters on the reduction behavior, adsorption behavior and Fischer-Tropsch synthesis (F-T) activity of the coprecipitated FeMn / SiO2 catalysts were investigated. The Cu promoter is introduced as coprecipitates with Fe, Mn, SiO2 and the K promoter is introduced by uniformly adding the precipitation slurry prior to spray-drying. The results show that Cu can significantly improve the reduction performance of catalyst. K promoter can promote the reduction of catalyst in CO but inhibit the reduction in H2. Meanwhile, the addition of Cu and K will further promote the reduction of the catalyst in H2 or CO. Cu The additives can promote the adsorption of H2 while the K additives have no obvious effect on the adsorption of H2. Cu improves the FT synthesis activity to a certain extent, shortens the induction period, K significantly promotes the conversion of CO and inhibits the H2 conversion relatively, and Prolonging the induction period of the reaction. The synergistic effect of Cu and K not only improves the conversion rate of the reaction but also shortens the induction period of the reaction. K makes the average molecular weight of the hydrocarbon product increase, while Cu alone has little effect on the hydrocarbon product distribution. Further increase the molecular weight of the hydrocarbon product.