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The unsupported Cu and Ag catalysts with different oxidation states were prepared, and their catalytic performances for propylene epoxidation were investigated. The metallic Cu catalyst exhibits much higher catalytic activity and propylene oxide (PO) selectivity than Cu2O and CuO catalysts. The Cu0 species are the main active sites for propylene epoxidation, but Cu2O and CuO species are in favor of...
The Ag/α-Al2O3 catalyst modified with rare earth metal oxide (Y2O3) and alkali metal oxide (K2O) for the epoxidation of propylene by molecular oxygen were prepared and characterized by TG-DTA, XRD and XPS. The results show that a small quantity of Y2O3 added plays a role of electron and structure-type promoters, and can change the binding energies of Ag3d and restrain the sintering of Ag crystallites...
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