Integrating Hydrogen Dissociation and Spillover Sites Into Platinum Confined SAPO‐34 Zeolite Unlocks Efficient CO ₂ Hydrogenation to Light Alkanes

Abstract

ABSTRACT The depressing of atmospheric CO 2 concentration necessitates sustainable chemical conversion strategies by direct hydrogenation to light alkanes (C 2 0 ‐C 4 0 ) 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 CO 2 conversion (46.1%) with C 2 0 ‐C 4 0 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 H 2 dissociation and spillover to significantly promote light olefin hydrogenation to corresponding alkanes.