Abstract
Abstract Epoxidation of propylene to propylene oxide over Ag/TS-1 in the presence of oxygen and hydrogen was carried out in a fixed-bed, quartz flow reactor. The effects of Ag loading, support, Si/Ti mol ratio of TS-1 and calcination temperature of Ag/TS-1 on the propylene epoxidation were investigated. The results show that Ag loading, support and the calcination temperature of Ag/TS-1 as well as the Si/Ti mol ratio of TS-1 have a great effect on the catalytic properties. The optimum Ag loading, calcination temperature of Ag/TS-1 and Si/Ti mol ratio of TS-1 are 2wt%, 450°C and 64, respectively. Over 2.0wt%Ag/TS-l (n Si /n Ti =64) catalyst, at a space velocity of 300011 1 , 0.92% propylene conversion with 91.2% selectivity to propylene oxide is obtained at 150°C. The deactivation of Ag/TS-1 catalyst is not due to the changes of active species, but the coke of the catalyst, which can be easily regenerated by calcination at 450°C in air.
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