The catalytic activity of bimetallic FeCoBEA zeolite catalysts in Fischer-Tropsch synthesis – The role of cobalt in framework position of dealuminated SiBEA zeolite

Two series of BEA zeolite modified with transition metals (Co and Fe) with different metals loadings were obtained: the first one was prepared by classical sequential wet impregnation to obtain C-FexCoyAlBEA catalysts; the second one was obtained by a two-step postsynthesis method to design C-FexCoySiBEA catalysts. The catalytic activity of both series of FeCoBEA zeolite catalysts was determined by the FTS process. These bimetallic catalysts appear to combine the advantages of monometallic cobalt catalysts (lower selectivity towards CO2 than for monometallic iron catalysts) and iron catalysts (lower selectivity towards CH4 than for monometallic cobalt catalysts), while minimizing their disadvantages, such as the large amount of carbon deposition.