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Small and narrowly distributed nanoparticles of copper alloyed with gallium supported on silica containing residual Ga III sites can be obtained via surface organometallic chemistry in a two-step process: (i) formation of isolated Ga III surface sites on SiO 2 and (ii) subsequent grafting of a Cu I precursor, [Cu(O  t  Bu)] 4 , followed by a treatment under H 2 to generate CuGa  x  alloys. This material is highly active and selective for CO 2 hydrogenation to CH 3 OH. In situ X-ray absorption spectroscopy shows that gallium is oxidized under reaction conditions while copper remains as Cu 0 . This CuGa material only stabilizes methoxy surface species while no formate is detected according to ex situ infrared and solid-state nuclear magnetic resonance spectroscopy.

chemical science

Enhanced CH3OH selectivity in CO2 hydrogenation using Cu-based catalysts generated via SOMC from GaIII single-sites