Comparison of PdCo/SBA-15 prepared by co-impregnation and sequential impregnation for Fischer–Tropsch synthesis

• Co-Pd/SBA-15 was prepared by co-impregnation (CIP) and sequential impregnation (SIP).
• The reduced SIP catalyst had better Co dispersion.
• Pd enhanced reduction of cobalt oxides and hydrogenation in FTS.
• The SIP catalyst gave higher conversions of CO and H2.
• The SIP catalyst gave higher selectivity and yield of C5–C9 products.

Properties and catalytic performance of bimetallic Pd–Co/SBA-15 prepared by co-impregnation (0.2Pd–10Co-CIP) and sequential impregnation (0.2Pd–10Co-SIP) for Fischer–Tropsch synthesis (FTS) were investigated. After calcination, Co3O4 was formed and located inside the channels of SBA-15 and on external surface. Compared to 0.2Pd–10Co-SIP, 0.2Pd–10Co-CIP had a smaller surface area, pore size, lower reduction temperature and less active sites due to larger particle sizes of Co3O4. From FTS testing, 0.2Pd–10Co-SIP provided higher and steadier conversions of CO and H2 as well as higher yield of C5–C9 products.

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