Temperature-driven mechanistic transition in propylene oxidation over Pt/CeO₂ ensemble catalysts.

ABSTRACT: Pt/CeO₂ ensemble catalysts are promising for propylene (C₃H₆) oxidation in vehicle exhaust, yet identifying the intrinsic active sites and understanding how the metal-support interface evolves at varying reaction temperatures remains contentious. Herein, we demonstrate that H₂-activated Pt/CeO₂ ensemble catalysts feature metallic Pt ensembles as intrinsic active sites, lowering the 50% conversion temperature by 120 °C after hydrogen activation. Various operando characterization techniques reveal an approximately 170 °C threshold temperature for the dynamic change of the reaction models. Meanwhile, kinetics and theoretical analysis illustrates that oxygen-facilitated dehydrogenation of sp³ C-H bonds is the rate-determining st

SUBMITTER: Li Z 

PROVIDER: S-EPMC12532794 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature