Abstract
Co-precipitated FeSi-cp catalysts, impregnated FeSi-im catalyst and core–shell Fe@Si catalysts synthetized through different method were characterized by N2 adsorption, ICP, XRD, TEM, H2-TPR, CO-TPD, Mössbauer spectroscopy and TG. The configuration between Fe and Si played an important role in the catalyst performance. Both FeSi-cp and FeSi-im showed high dispersion, but easily to be agglomerated in FTS. In contrast, Fe@Si has high crystallinity and strong CO chemisorption capacity, which is conducive to the formation of Fe5C2. The SiO2 shell could isolate the active components, reduce carbon deposition and restrain the production of C5+. The results of FTS performance revealed that core–shell Fe@Si catalysts show higher C2∼4= selectivity and better FTS stability in 120 h.
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