Highly efficient ZnCeZrOx/SAPO-34 catalyst for the direct conversion of CO2 into light olefins under mild reaction conditions

Currently, restricting the formation of CO and paraffin by-products at mild reaction conditions, and avoiding the waste of carbon resources remain challenging for CO2 hydrogenation into light olefins. Herein, we constructed a bifunctional catalyst consisting of Zn0.3Ce0.2Zr1.8O4 solid solution and SAPO-34 zeolite. The catalyst shows excellent performance with a high C2= - C4= selectivity of 90.1% and an O/P ratio of 60.1 at a CO2 conversion of 6.0% at 280 & DEG;C and 0.5 MPa, while the selectivity of CO is only 7.9%. Various characterization and designed experiment results demonstrate that incorporating appropriate amounts of Ce in Zn0.3ZrOx generates more ox-ygen vacancies that improve CO2 activation to form formate and methoxy intermediates at low temperature and pressure. This promotes the evolution of these intermediates into light olefins over the SAPO-34 zeolite, enhancing the overall capacity of the bifunctional Zn0.3Ce0.2Zr1.8O4/SAPO-34 composited catalyst in CO2 hy-drogenation under mild conditions.