Research progress of CO oxidative dehydrogenation of propane to propylene over Cr-free metal catalysts.

CO-assisted oxidative dehydrogenation of propane (CO-ODHP) is an attractive strategy to offset the demand gap of propylene due to its potentiality of reducing CO emissions, especially under the demands of peaking CO emissions and carbon neutrality. The introduction of CO as a soft oxidant into the reaction not only averts the over-oxidation of products, but also maintains the high oxidation state of the redox-active sites. Furthermore, the presence of CO increases the conversion of propane by coupling the dehydrogenation of propane (DHP) with the reverse water gas reaction (RWGS) and inhibits the coking formation to prolong the lifetime of catalysts via the reverse Boudouard reaction.