Gas-Phase Propylene Epoxidation over Ag/TS-1 Prepared in W/O Microemulsion: effects of the molar ratio of water to surfactant and the reaction temperature

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Ag/TS-1 was prepared by microemulsion method in which dioctyl sulfosuccinate sodium salt (AOT) was used as the surfactant and n-heptane as the organic solvent. The synthesized Ag/TS-1 was characterized by UV–Vis and TEM and its catalytic properties in gas-phase propylene epoxidation were carried out in a fixed bed reactor. The results show that Ag is highly dispersed on TS-1 and the crystal size can be adjusted through the adjusting of the molar ratio of water to surfactant ([H2O]/[surfactant] = R). The catalyst prepared with R = 4.74 exhibits the highest catalytic activity for propylene epoxidation in gas-phase, the optimal reaction temperature scope is between 363 and 383 K. Over the catalyst prepared with R = 4.11, propylene conversion and the selectivity to propylene oxide (PO) are 1.1% and 91.0%, respectively.

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