Product distributions including hydrocarbon and oxygenates of Fischer-Tropsch synthesis over mesoporous MnO_2-supported Fe catalyst

摘要

Catalytic reaction performances of home-made mesoporous MnO_2-supported Fe-based catalyst with copper promoter for Fischer-Tropsch synthesis (FTS) are investigated in a slurry-phase reactor at 533 K-573 K and 1.0 MPa. The present catalyst system exhibits high olefin selectivity, however, the selectivity to ethylene is lower than the extrapolation based on the C_3~+. Simultaneously, the catalyst gives high oxygenates productivity except for the C_1 oxygenates. Comprehensive product distributions including hydrocarbon and oxygenates at different temperatures are presented. Particular attention is paid to the new overall distribution of product based on the carbon numbers when the hydrocarbon is combined with oxygenates. The new distributions at different temperatures show similar trends, displaying low C_1 product selectivity and almost accordant C_2 product selectivity with the extrapolation from AndersonSchulz-Flory (ASF) law. An attempt is made to elucidate the deviation behavior of C_1 and C_2 hydrocarbon.