A green synthetic route to fischer-tropsch catalysts by complexing and dissolving iron powder with citric acid
Citric acid is one of the most productive biomass organic acids in the world and has been widely used.In this paper,we used reduced iron powder as iron source,citric acid as multidentate ligand and carbon source,and used ammonia to enhance the coordination solubilization ability of citric acid to iron powder,so that it could quickly form a homogeneous complex sol-gel,which was then carbonized to obtain carbon-coated core-shell iron-based Fischer-Tropsch catalyst.In the performance test,the catalyst synthesized by direct dissolution of iron powder with citric acid exhibited remarkable catalytic activity and stability,giving the CO conversion of 99.2%,C5+ hydrocarbon selectivity of 53%,and the CO conversion activity was stably kept above 97.3%for a time on stream of 168 h.The citric acid coordination method is greener and safer,which avoid the use of iron salts such as ferric nitrate,and the risk of explosion and toxic gases in the reduction process of iron salts.This synthesis method provides a new idea for the green and safe production of catalysts.
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