Abstract
Tailoring the interface between active metals and promoters to improve catalytic performance is a challenging issue for bicomponent catalysts. Herein, we developed a series of silica supported Pt-CoOx hybrid nanocatalysts though in situ oxidation of supported bimetallic PtCo nanoparticles (NPs) with different Pt/Co ratios. Focusing on the hydrogenation of acetophenone to 1-phenylethanol as the model reaction, the obtained Pt-CoOx/SiO2 catalysts showed superior activity and selectivity compared to Pt/SiO2, and the sample with a Co/Pt molar ratio of 1/3 performed the best. Our research showed that the CoOx on Pt not only changed its electronic and geometric properties, but also promoted the adsorption of reactants and the dissociation of H2. A further increase of the Co/Pt ratio to 1/1, however, reduced the activity due to blockage of the Pt surface.
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