Core/shell-structured TS-1@mesoporous silica-supported Au nanoparticles for selective epoxidation of propylene with H2 and O2

• DOI: 10.1039/c1jm10483g
• Publication Date: 2011-06-17T03:04:24Z
• Authors: Le Xu; Yingjie Ren; Haihong Wu; Yueming Liu; Zhendong Wang; Yingtian Zhang; Jiajia Xu; Honggen Peng; Peng Wu
• Keywords: Ammonium bromide; Propylene oxide; Mesoporous organosilica; Particle (ecology)

Hierarchically ordered materials with core/shell structures were synthesized through a layer-by-layer approach. The novel microporous/mesoporous hybrid composed of TS-1 zeolite particle for the core and mesoporous silica shell. as-synthesized crystals modified polydiallyldimethylammonium chloride to make their external surface positively charged, which induced an oriented self-assembly tetraethoxysilane (TEOS) cetyltrimethyl ammonium bromide on form shell mesophase silica. thickness was controlled be in range 30–55 nm by changing amount TEOS added synthesis. channels perpendicular core, made micropores inside accessible from outside mesopores. Taking advantage confining effect mesopores, Au nanoparticles incorporated into shell, resulting bifunctional catalysts more selective than conventional Au/TS-1 direct epoxidation propylene oxide H2 O2.