Hydrogen Spillover Induced PtCo/CoO_x Interfaces with Enhanced Catalytic Activity for CO Oxidation at Low Temperatures in Humid Conditions

Abstract

The development of catalysts with abundant active interfaces for superior low‐temperature catalytic CO oxidation is critical to meet increasingly rigorous emission requirements, yet still challenging. Herein, this work reports a PtCo/CoOx/Al2O3 catalyst with PtCo clusters and enriched Pt─O─Co interfaces induced by hydrogen spillover from the Pt sites and self‐oxidation process in air, exhibiting excellent performance for CO oxidation at low temperatures and humid conditions. The combination of structural characterizations and in situ Fourier transform infrared spectroscopy reveals that the PtCo cluster effectively prevents CO saturation/poisoning on the Pt surface. Additionally, the presence of Pt─O─Co interfaces in the PtCo/CoOx/Al2O3 catalyst provides a significant number of active sites for oxygen activation and ─OH formation. This facilitates efficient generation of CO2 at ambient temperature by coupling with nearby adsorbed CO molecules, resulting in superior low‐temperature activity and long‐term stability for CO oxidation under humid conditions. This work provides a facile route toward rationalizing the design of catalysts with more active interfaces for superior low‐temperature CO oxidation under humid conditions for practical applications.

Precision Synthesis of Sub-3 nm Bimetallic Alloy Nanoparticles for Efficient and Selective Catalytic Hydrogenolysis of 5-Hydroxymethylfurfural to 2,5-Dimethylfuran

“…Two peaks were observed at ∼2062 and 2085 cm –1 , attributed to the CO molecules that are linearly adsorbed on the Pt and Pt δ+ atoms. An additional peak appeared at ∼1827 cm –1 , indicating bridging CO on two neighboring Pt atoms. , A shift in peak position with the desorption time of CO was also observed due to the changes in the CO coverage on the surface. In contrast, PtCo@C showed distinct spectral features (Figure b).…”