EFFECTS OF PROMOTER DEPOSITION ORDER AND SOLVENT ON PREPARATION OF COBALT FISCHER-TROPSCH CATALYSTS

摘要

Previous studies have shown that preparation method and pretreatment conditions affect dispersion, extent of reduction, location, and density of cobalt and promoter species in Fischer-Tropsch (FT) catalysts.1 While the preparation method should lead to highly active and selective cobalt FT catalysts, it also needs to satisfy the technical and economic feasibility of scale-up. Some non-aqueous preparation methods have been found to produce active and selective cobalt catalysts. However, highly volatile and flammable solvents are not suitable for producing industrial scale quantities of catalyst. Accordingly, aqueous methods that result in catalysts of comparable activity may be preferred. In addition, the high cost of noble metal promoters requires they be used efficiently. In this work, we investigate how the solvent nature and the ruthenium deposition order affect physicochemical and activity/selectivity properties of Co/Ru/La/Al2O3 FT catalysts. This study is expected to provide insight into the influence of solvent nature and promoter deposition order on cobalt catalysts and develop an industrial procedure to prepare more economically viable catalysts for the FT synthesis.