Integrating Hydrogen Dissociation and Spillover Sites Into Platinum Confined SAPO-34 Zeolite Unlocks Efficient CO₂ Hydrogenation to Light Alkanes

The depressing of atmospheric CO₂ concentration necessitates sustainable chemical conversion strategies by direct hydrogenation to light alkanes (C₂⁰-C₄⁰) over oxide/zeolite (OXZEO) bifunctional catalyst. Prior studies demonstrated that SSZ-13 aluminosilicate with strong acidity as zeolite component promotes hydrogen transfer to yield alkanes but also accelerates coking/deactivation, while SAPO-34 silicoaluminophosphate with moderate acidity greatly improves the catalytic stability but yields insufficient alkane selectivity. Herein, we designed a new OXZEO bifunctional catalytic system based on trace Platinum species (0.11 wt.%) confined within SAPO-34 coupling with ZnZrO_x solid solution (ZnZrO_x/Pt@SAPO-34), achieving a high CO₂ conversion (46.1%) with C₂⁰-C₄⁰ selectivity (94.1%), and giving a superior stable lifetime over 200 h. The excellent catalytic performance is attributed to the confined hydrogen spillover mechanism over Pt species in SAPO-34 that suppresses carbon deposition and enables efficient H₂ dissociation and spillover to significantly promote light olefin hydrogenation to corresponding alkanes.