Oxidative Dehydrogenation Of Ethane With Co_2 Over Novel Cr/sba-15/al_2o_3/fecral Monolithic Catalysts

摘要

The oxidative dehydrogenation (ODH) of ethane with CO_2 was successfully carried out over the Cr-based monolithic catalysts, which were prepared using FeCrAl alloy foil as support. High catalytic activity and stability can be drawn on these monolithic catalysts. For example, 66.5% ethane conversion and 99.5% ethylene selectivity can be achieved on the 5.0% Cr loading monolithic catalyst at 750 ℃. After 1130 h of stability reaction, the hexagonal mesoporous structure of SBA-15 was still present and the pore walls of SBA-15 prevented the aggregation of Cr species. It was proposed that the Cr~(6+) species were responsible for the high catalytic activity of monolithic catalysts. During the reaction, the reduction-oxidation cycle between Cr~(6+) and Cr~(3+) species can be carried out via the dehydrogenation of ethane and oxidation by CO_2 processes. Interactions between Cr, SBA-15, and the Al_2O_3/FeCrAl support modify the redox properties of the Cr/SBA-15/Al_2O_3/FeCrAl catalysts.