Olefin production by oxidative dehydrogenation of C3-C4-Paraffins in CO2 presence

Effective chromium-oxide catalysts prepared by the method of wet impregnation of silica gel and direct hydrothermal synthesis of mesoporous MCM-41 were proposed for propane and isobutane oxidative dehydrogenation in the presence of CO2. Detailed study of catalyst deactivation allowed determining the limit of Cr amount at which catalyst deactivation is reversible. The regeneration of catalysts by O2 was fully reduced the initial catalyst activity. Deactivation of chromium catalysts prepared by wet impregnation was fully reversible at chromium concentrations < 2%. Maximum amount of chromium that could be incorporated into the MCM-41 framework was 3 wt %. The mechanism and kinetics of propane oxidative dehydrogenation were elucidated. This is an abstract of a paper presented at the Future Feedstocks for Fuels and Chemicals