Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 21, Issue 29, Pages 10852-10858Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm10483g
Keywords
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Funding
- NSFC of China [20890124, 20925310, 20873043]
- Science and Technology Commission of Shanghai Municipality [09XD1401500]
- Shanghai Leading Academic Discipline Project [B409]
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Hierarchically ordered materials with core/shell structures were synthesized through a layer-by-layer approach. The novel microporous/mesoporous hybrid materials were composed of a TS-1 zeolite particle for the core and mesoporous silica for the shell. The as-synthesized TS-1 crystals were modified with polydiallyldimethylammonium chloride to make their external surface positively charged, which induced an oriented self-assembly of tetraethoxysilane (TEOS) with cetyltrimethyl ammonium bromide on the TS-1 particle surface to form a shell of mesophase silica. The thickness of the mesoporous silica shell was controlled to be in the range 30-55 nm by changing the amount of TEOS added in the synthesis. The mesoporous channels in the shell were perpendicular to the zeolite core, which made the micropores inside the core accessible from the outside through the mesopores. Taking advantage of the confining effect of the mesopores, Au nanoparticles were incorporated into the shell, resulting in bifunctional catalysts which were more selective than conventional Au/TS-1 catalysts in the direct epoxidation of propylene to propylene oxide with H-2 and O-2.
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