Dilute PdAu nanoparticles embedded in a porous silica framework are investigated as catalysts for selective hydrogenation reactions. The catalyst materials are made by a novel colloid templating procedure that yields oxides with defined porosity. The nanoparticle catalysts are partially embedded in the silica, leading to a high degree of resistance to sintering. The dependence of selectivity and activity is optimized for 4% palladium. The selectivity and activity are also strongly modulated by pretreatment conditions. In situ x-ray studies and CO DRIFTS are used to relate activity to the surface structure and composition. Isotopic labeling is used to discern the mechanism for selective reaction. Complementary density functional theory studies provide insight into the catalyst behavior.<br/>

Selective hydrogenation using dilute PdAu alloys:  Understanding catalyst evolution during reaction

2019 Spring National Meeting

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