Fischer-Tropsch synthesis. Influence of the presence of intermediate iron reduction species in Fe/Zeolite L catalysts

摘要

Two catalyst to be used in the Fischer-Tropsch reaction, using zeolite-L in potassic form as support of iron species were prepared through to different methods of impregnation with iron salt. X-Ray Diffraction (XRD), Specific Surface Area (BET), Moessbauer Spectroscopy (MS) in controlled atmosphere, between room temperature (RT) and 15 K, H_2 chemisorption and Volumetric Oxidation (VO) were used to characterise the solids. The impregnation of the zeolite L under inert gas allowed to obtain a fraction of Fe° in contact with Fe~(2+) ions that enhanced the activity of the sites. The two catalysts presented similar selectivity towards hydrocarbons and low chain growth.