CrMn‐based catalysts for oxidative dehydrogenation of propane to propylene with CO2

Abstract The paper investigates the catalytic oxidative dehydrogenation of propane with carbon dioxide (ODH‐CO 2 ) as a promising route for propylene production, an avenue yet to be commercially developed. Utilizing the incipient wetness catalyst preparation method, CrMn catalysts were synthesized on three supports (γ‐Al 2 O 3 , ZSM‐5, and SBA‐15). Comprehensive characterization through Brunauer–Emmett–Teller (BET) analysis, X‐ray diffraction (XRD), thermogravimetric analysis (TGA), transmission electron microscopy (TEM)/scanning transmission electron microscopy (STEM)‐energy‐dispersive X‐ray spectroscopy (EDS), and hydrogen temperature programmed reduction (H 2 ‐TPR) was conducted to comprehend catalyst behaviour. Among the six catalysts tested, Cr/SBA‐15 was exhibited as the best performer, achieving propane and CO 2 conversions of 36.2% and 14.1%, respectively, with a propylene selectivity of 33.4%. Over a 50‐h time on stream (TOS), it demonstrated gradual declines in conversions while retaining 75% of initial values. The incorporation of manganese as a promoter effectively mitigated coke formation, albeit with slight reductions in propane conversion and propylene selectivity.