Surface Redox Dynamics in Gold–Zinc CO2 Hydrogenation Catalysts

• DOI: 10.1021/jacs.3c03522
• Publication Date: 2023-06-15T13:56:56Z
• Authors: Scott R. Docherty; Olga V. Safonova; Christophe Copéret
• Keywords: Bimetallic strip; X-ray absorption spectroscopy; Organometallic Chemistry; Reactivity

Au-Zn catalysts have previously been shown to promote the hydrogenation of CO2 methanol, but their active state is poorly understood. Here, silica-supported bimetallic alloys, prepared by surface organometallic chemistry (SOMC), are be proficient for methanol. In situ X-ray absorption spectroscopy (XAS), in conjunction with gas-switching experiments, used amplify subtle changes occurring at this tailored catalyst during reaction. Consequently, an alloy identified and undergo subsequent reversible redox under reaction conditions according multivariate curve resolution alternating least-squares (MCR-ALS) analysis. These results highlight role alloying dealloying Au-based illustrate these processes driving reactivity.