Abstract:
Propylene is an important chemical industry raw material, which can be used to produce a variety of chemical products. In recent years, traditional routes to produce the propylene cannot fulfill the steady increasing demand for propylene. Utilizing propane from shale gas or natural gas to produce propylene represents an important environmentally friendly alternative to conventional petroleum cracking. Compared to the already industrialized direct dehydrogenation of propane (PDH), oxidative dehydrogenation of propane to propylene (CO
2-ODHP) can not only realize the efficient conversion of propane at lower temperature, but also reduce coke deposition via the reverse Boudouard reaction.Compared with oxidative dehydrogenation of propane (O
2-ODHP), CO
2-ODHPcan effectively inhibit overoxidation of propylene, and it is a potentital approache to produce propylene. Additionally, CO
2-ODHP reduces emissions of the acidic gas via chemical conversion, offering significant environmental benefits.In this review, we summarized the recent research progress of catalyst systems (Pt-, Gr-, Ga-, V-, and In-based metal catalysts), role of CO
2, catalytic mechanism and deactivation mechanism in the CO
2-ODHP. Typically, CO
2-ODHP reaction on Pt-based, Ga-based, and In-based catalysts follows a mechanism coupling PDH and the reverse water-gas shift reaction. In contrast, Cr-based and V-based catalysts generally operate via a Mars-van Krevelen redox mechanism. Commonly, catalyst deactivation in CO
2-ODHP is attributed to coking, sintering, and structural changes. We also present perspectives for future progress in the CO
2-ODHP. In the future, it is crucial to clarify the catalytic mechanism through advanced characterizations and theoretical calculations. The development of a bifunctional catalyst capable of effectively activating CO₂ and selectively converting propane into propylene is key to the industrialization of the CO₂-ODHP reaction.