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Abstract: A series of In promoted Au/TS-1 catalysts was prepared and tested for direct propylene epoxidation with H2 and O2. The In promotion could effectively enhance the reactivity and stability of the catalysts. A PO formation rate of 56gPO h−1 kgcat −1 was obtained over a 0.57Au/0.4In-TS-1 catalyst, which was about 80% enhancement compared to an un-promoted 0.25Au/TS-1 catalyst (32gPO h−1 kgcat −1). The enhancement was due to a higher Au capture efficiency by the modification of In on the TS-1 surface, and a higher dispersion of Au species in the catalyst. [Copyright &y& Elsevier]

Abstract: A series of Ir/ZrO2 catalysts with different Ir contents were tested for gas phase selective hydrogenation of crotonaldehyde. It was found that the reactivity of the catalyst increased with increasing Ir content, but rapid deactivation was observed on all the catalysts during the reaction, which might be due to CO poisoning generated by decarbonylation reaction. The highest selectivity (82.2%) to crotyl alcohol was obtained over a catalyst with 3% Ir content, which was attributed to the proper Ir particle size and the highest amount of surface acid sites in the catalyst. [Copyright &y& Elsevier]