Redox MoO3/CaMnO3 catalysts for chemical-looping oxidative dehydrogenation of propane: A greener approach of propylene production.

A redox catalyst with MoO 3 loaded on CaMnO 3 perovskite was evaluated for chemical-looping oxidative dehydrogenation (ODH) of propane to produce propylene. This approach requires less energy for the production per unit of propylene with minimum CO 2 emission, which is highly desirable from an environmental perspective. H 2 -TPR indicates that the incorporation of MoO 3 minimizes the release of surface oxygen, which is favorable for high propylene selectivity. XRD reveals the presence of active sites, while scanning SEM-EDX show uniform dispersion of deposited MoO 3 on CaMnO 3. XPS analysis demonstrates that MoO 3 addition promotes the formation of lattice oxygen which improves the propylene selectivity. The highest propylene yield of 30.6% with a propylene selectivity of 59% was achieved at 550 ℃ with 10% MoO 3 /CaMnO 3. The catalysts also show stable activity in successive redox cycles. The addition of MoO 3 enhances propylene yield and selectivity, due to free lattice oxygen, as revealed by XPS and H 2 -TPR. [Display omitted] [ABSTRACT FROM AUTHOR]