期刊
ACS CATALYSIS
卷 1, 期 3, 页码 207-211出版社
AMER CHEMICAL SOC
DOI: 10.1021/cs1000762
关键词
An nanoparticles; catalysis; hollow mesoporous silica microspheres; sol-gel process; yolk-shell catalyst
资金
- National Science Foundation of China [20974051, 21074059]
- Tianjin Natural 10 Science Foundation [09JCYBJC02800]
Synthesis and catalysis of yolk-microspheres containing single Au nanoparticle core and a mesopurous shell of hallow mesoporous silica microspheres (HMSM)are reported. This synthesis employs polystyrene-co-poly(4-vinylpyridne) micorsphereses both template to fabricate the HMSM shell through sol-gel process and scalffold to immobilize the Au nanoparticle. Since the single Au nanoparticle cor is supernatant within the inert HMSM shell, the yolk-shell catalyst has minimum support effect and is a promising model to explore the origin of Au catalysis. Catalyzed reduction of 4-nitorphenol with NaBH4 demonstrates size dependent induction or activation and size dependent activity of the Au nanoparticle of the yolk-shell catalyst.
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