Ce-doped mesoporous alumina supported Fe-based catalyst with high activity for oxidative dehydrogenation of 1-butene using CO_2 as soft oxidant

摘要

Ce-doped mesoporous alumina supported Fe-based catalyst (Fe2O3/Meso-CeAl) was prepared and employed for 1,3-butadiene (BD) synthesis by oxidative dehydrogenation of 1-butene, using CO2 as soft oxidant. The worm-like porous structure of Fe2O3/Meso-CeAl catalyst with highly dispersed Ce in alumina matrix and high dispersion of iron species on Meso-CeAl surface was confirmed by N-2 adsorption, transmission electron microscopy and X-ray diffraction results. Compared with Fe2O3/gamma-Al2O3 and Fe2O3/Meso-Al2O3 catalysts, X-ray photoelectron spectroscopy and CO2-TPD results respectively demonstrated the increasing in oxygen storage capacity and improvement in CO2 adsorption and activation ability for Fe2O3/Meso-CeAl-100 catalyst. Consequently, the Fe2O3/Meso-CeAl-100 catalyst showed excellent catalytic activity (1879 g(BD)/kg(cat)/h), high CO2 conversion (14%) and high BD selectivity (51%). Not only the structural properties and highly dispersed iron species, but also the good oxygen storage capacity and thus good CO2 adsorption and activation ability contributed positively to the good performance of Fe2O3/Meso-CeAl-100 catalyst.