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An influence of support morphology and Pd promoter on physicochemical properties and catalytic performance of Co/SBA-15 in Fischer–Tropsch Synthesis (FTS) was investigated. SBA-15(M) from a hydrothermal synthesis with decane addition had smaller particle size, larger pore size and shorter cavity length which enhanced the dispersion of cobalt oxides, eased diffusion of reactants and improved the FTS performance. 10Co/SBA-15(M) provided the highest and most steady conversions of CO and H 2 with the highest yield of C 5 –C 9 products. The addition of Pd enhanced the reduction of cobalt oxides but produced more methane and light paraffins. [ABSTRACT FROM AUTHOR]

Abstract: The objectives of this work were to compare physicochemical properties of silica-supported cobalt catalysts (with 10wt% Co) prepared by impregnation (10Co-IP) and precipitation using a reverse micelle technique (10Co-RM) and to investigate influence of palladium as a promoter (0.2wt% and 1.0wt%) on properties of 10Co-IP and 10Co-RM. The catalysts were characterized by XRD, H2-TPR, DR-UV–vis, XANES, EXAFS and the reactivity during Fischer–Tropsch synthesis (FTS) was tested at 230°C, 5 bar with H2/CO=2. The particle size of Co3O4 in 10Co-IP was larger than that of 10Co-RM which could contribute to lower selectivity to methane and C2–C4 paraffin products. The addition of 0.2wt% Pd to 10Co-IP and 10Co-RM enhanced the cobalt reducibility, FTS activity and paraffin selectivity. On the other hand, the addition of 1.0wt% Pd resulted in increased methane formation and lower CO conversion. The most suitable catalyst from this work was 0.2Pd-10Co-IP that gave high CO conversion (34.8%) and high mole fraction of paraffins (0.38) in the gasoline range (C5–C9). [Copyright &y& Elsevier]