Highly Active Catalytic CO2 Hydrogenation to Lower Olefins via Spinel ZnGaOx Combined with SAPO‐34

Abstract A key primary method for creating a carbon cycle and carbon neutrality is the catalytic hydrogenation of CO 2 into high value‐added chemicals or fuels. In this work, ZnGaO x oxides were prepared by parallel co‐precipitation and physically mixed with SAPO‐34 molecular sieves prepared by hydrothermal synthesis to produce ZnGaO x /SAPO‐34 bifunctional catalysts, which were evaluated for the catalytic synthesis of lower olefins (C 2 = −C 4 = ) from carbon dioxide hydrogenation. It was demonstrated that the reaction process requires oxygen defect activation, synergistic hydrogenation, and CO 2 alkaline adsorption of ZnGaO x . The spinel structure of ZnGaO x has more abundant oxygen defects and alkaline adsorption sites than the ZnGaO x solid solution, which effectively enhances the catalytic performance. The CO 2 conversion was 28.52%, the selectivity of C 2 = −C 4 = in hydrocarbons reached 70.01%, and the single‐pass yield of C 2 = −C 4 = was 10.95% at 370 °C, 3.0 MPa, and 4800 mL/g cat /h.