Reactivity Switch of Platinum with Gallium: From Reverse Water Gas Shift to Methanol Synthesis

• DOI: 10.26434/chemrxiv-2024-4j2gw-v2
• Publication Date: 2024-03-28T05:08:39Z
• Authors: Wei Zhou; Enzo Brack; Christian Ehinger; James Paterson; Jamie Southouse; Christophe Copéret
• Keywords: Water-gas shift reaction; Reactivity

The development of efficient catalysts for the hydrogenation CO2 to methanol using “green” H2 is foreseen be a key step close carbon cycle. In this study, we show that small and narrowly distributed alloyed PtGa nanoparticles supported on silica, prepared via surface organometallic chemistry (SOMC) approach, display notable activity methanol, reaching 7.2 mol h-1 molPt-1 formation rate with 54% intrinsic CH3OH selectivity. This reactivity sharply contrasts what expected Pt, which favors reverse water gas shift reaction, albeit poor (2.6 molPt-1). situ XAS studies indicate ca. 50% Ga reduced Ga0 yielding nanoparticles, while remaining persist as isolated GaIII sites. catalyst slightly dealloys under conditions displays redox dynamics PtGa-GaOx interfaces, responsible promoting both Further tailoring interface by support in place silica enables improve factor ~5.