Study on reduction and carburization behaviors of iron-based Fischer-Tropsch synthesis catalyst

摘要

Fischer-Tropsch synthesis (FTS), as an important technology for producing liquid fuels and chemicals from syngas derived from coal, natural gas, and biomass materials, is receiving a renewed interest for both industrial and academic applications. Transformation and adsorption behaviors of iron species during reduction and carburization over a precipitated Fe-based FTS catalyst were investigated systemically. The results indicated that phase transformation of iron species during reduction is following as α-Fe2O3 → Fe3O4 → FeO → α-Fe, whereas the transformation trend of iron phases during carburization follows as α-Fe2O3 → Fe3O4 → iron carbides. Carburization ability of reduced iron species is following the order α-Fe > FeO > Fe3O4. The conversion of FeO and α-Fe to iron carbides provides the active sites for FTS.