Abstract
A new microporous and mesoporous composite with a core/shell structure, TS-1@Mesosilica (TS-1@MS), was synthesized by self-assembly technique. With the assistance of nonionic surfactant as template, the silica shell was readily coated on the surface TS-1 crystal core. Possessing a three-dimensional and interconnected wormhole-like mesopore structure, the silica shell served as a good support for incorporating gold nanoparticles (Au NPs) inside channels, leading a bifunctional catalyst which catalyzes actively and selectively the gas-phase epoxidation of propylene with H<sub>2</sub> and O<sub>2</sub>. Au/TS-1@MS showed a constant propylene conversion (3.7%) and PO selectivity high as 87% at 473 K for 132 h of time on stream, indicating a high stability because of the confining effect of mesopores on Au NPs.
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