420 / 2018-07-30 22:51:09

Effect of K on Catalytic Performance of Fe@C Catalyst for Direct Conversion of Bio-syngas to Gasoline-range Hydrocarbons

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Growing concern on alternative processes for producing liquid fuels and chemicals has been spurred with rapid depletion of crude oil, in which Fischer-Tropsch synthesis (FTS) technology used for converting syngas (CO + H2) derived from coal, biomass or natural gas into fuel hydrocarbons and commodity chemicals, is receiving increasing interest for both academic and industrial applications. Adjusting the hydrocarbons product distribution is the focus of Fischer-Tropsch synthesis (FTS) reaction. Herein, a K-modified carbon-encapsulated iron catalyst (FeK@C) designed to optimize product distribution of hydrocarbons was synthesized by a simple one-step solvothermal method. With the increasing of K loading, CO conversion increased gradually from 70.57% to 96.36% and accompanied with the increase in FTY from 35.16 μmolCOgFe.-1s-1 to 57.02 μmolCOgFe.-1s-1. Incorporation of small amount of K (0.5 wt.%) into the iron catalyst results in a maximum C5-C12 selectivity (46.98%) and increases on Olefin/Paraffin ratio of hydrocarbons whereas restrained the selectivity of CH4 (Table 1).