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 (C2 0-C4 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 ZnZrOx solid solution (ZnZrOx/Pt@SAPO-34), achieving a high CO2 conversion (46.1%) with C2 0-C4 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 H2 dissociation and spillover to significantly promote light olefin hydrogenation to corresponding alkanes.