Modulation of acidic–basic and metal–carrier interactions in CO2-assisted propane dehydrogenation over Ga2Lax/ZSM-5 catalysts

Abstract

CO₂-ODHP has been demonstrated to be an effective technology for the production of propylene. CO₂ acts as a soft oxidizer that reduces over-oxidation of hydrocarbons and improves propylene selectivity. However, CO₂-ODHP still faces the challenge of rapid catalyst deactivation due to coke accumulation at elevated operating temperatures. Herein, we prepared a La-modified Ga/ZSM-5 catalyst, in which La modified the acidic–basic properties of Ga/ZSM-5 and improved the resistance to coke accumulation of the catalyst. The synthesized Ga₂La₁/ZSM-5 catalyst achieved propane conversion up to 80% at 580 °C. In situ DRIFTS analysis revealed that the addition of La could significantly accelerate the formation of HCOO* intermediates, which further improved the efficiency of the CO₂-ODHP reaction.