EXAFS and XPS studies of the influence of metal particle size, nature of support and H2 and CO adsorption on the structure and electronic properties of palladium

Abstract

Abstract For the gas-phase hydrogenation of vinylacetylene the highly dispersed supported palladium particles show a low turnover number, regardless of the nature of the support (silica, γ-alumina, carbon). The peculiarities of their structural and electronic properties were studied by EXAFS and XPS. Regardless of the nature of the support (SiO 2 , C), and the size of the Pd metal particles (19–108 A), the Pd-Pd interatomic distances are close to those for the bulk metal. The quantitative correlation between turnover number and the binding energy, E b , of the Pd core level was found.