Print Email Facebook Twitter Silica-Supported PdGa Nanoparticles Title Silica-Supported PdGa Nanoparticles: Metal Synergy for Highly Active and Selective CO2-to-CH3OH Hydrogenation Author Docherty, S.R. (ETH Zürich) Phongprueksathat, N. (TU Delft ChemE/Catalysis Engineering) Lam, Erwin (ETH Zürich) Noh, Gina (ETH Zürich) Safonova, Olga V. (Paul Scherrer Institut) Urakawa, A. (TU Delft ChemE/Catalysis Engineering) Copéret, Christophe (ETH Zürich) Date 2021 Abstract The direct conversion of CO2to CH3OH represents an appealing strategy for the mitigation of anthropogenic CO2emissions. Here, we report that small, narrowly distributed alloyed PdGa nanoparticles, prepared via surface organometallic chemistry from silica-supported GaIIIisolated sites, selectively catalyze the hydrogenation of CO2to CH3OH. At 230 °C and 25 bar, high activity (22.3 molMeOHmolPd-1h-1) and selectivity for CH3OH/DME (81%) are observed, while the corresponding silica-supported Pd nanoparticles show low activity and selectivity. X-ray absorption spectroscopy (XAS), IR, NMR, and scanning transmission electron microscopy-energy-dispersive X-ray provide evidence for alloying in the as-synthesized material. In situ XAS reveals that there is a dynamic dealloying/realloying process, through Ga redox, while operando diffuse reflectance infrared Fourier transform spectroscopy demonstrates that, while both methoxy and formate species are observed in reaction conditions, the relative concentrations are inversely proportional, as the chemical potential of the gas phase is modulated. High CH3OH selectivities, across a broad range of conversions, are observed, showing that CO formation is suppressed for this catalyst, in contrast to reported Pd catalysts. Subject AlloysCOhydrogenationHeterogeneous catalysisHydrogenationNanoparticlesOperando spectroscopy To reference this document use: http://resolver.tudelft.nl/uuid:baf9849d-48a8-4adb-bed3-7c2a863d5310 DOI https://doi.org/10.1021/jacsau.1c00021 ISSN 0002-7863 Source Journal of the American Chemical Society, 1 (4), 450-458 Part of collection Institutional Repository Document type journal article Rights © 2021 S.R. Docherty, N. Phongprueksathat, Erwin Lam, Gina Noh, Olga V. Safonova, A. Urakawa, Christophe Copéret Files PDF jacsau.1c00021.pdf 2.93 MB Close viewer /islandora/object/uuid:baf9849d-48a8-4adb-bed3-7c2a863d5310/datastream/OBJ/view