Hollow Alveolus-Like Nanovesicle Assembly with Metal-Encapsulated Hollow Zeolite Nanocrystals
发表时间：2019-03-13
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- 论文类型：
- 期刊论文
- 第一作者：
- Dai, Chengyi
- 合写作者：
- Zhang, Anfeng,Liu, Min,Gu, Lin,Guo, Xinwen,Song, Chunshan
- 发表时间：
- 2016-08-01
- 发表刊物：
- ACS NANO
- 收录刊物：
- SCIE、EI、PubMed、Scopus
- 文献类型：
- J
- 卷号：
- 10
- 期号：
- 8
- 页面范围：
- 7401-7408
- ISSN号：
- 1936-0851
- 关键字：
- hollow nanovesicle; multilevel structure; zeolite; metal-encapsulated; phenol degradation
- 摘要：
- Inspired by the vesicular structure of alveolus which has a porous nanovesicle structure facilitating the transport of oxygen and carbon dioxide, we designed a hollow nanovesicle assembly with metal-encapsulated hollow zeolite that would enhance diffusion of reactants/products and inhibit sintering and leaching of active metals. This zeolitic nanovesicle has been successfully synthesized by a strategy which involves a one-pot hydrothermal synthesis of hollow assembly of metal-containing solid zeolite crystals without a structural template and a selective desilication-recrystallization accompanied by leaching-hydrolysis to convert the metal-containing solid crystals into metal-encapsulated hollow crystals. We demonstrate the strategy in synthesizing a hollow nanovesicle assembly of Fe2O3-encapsulated hollow crystals of ZSM-5 zeolite. This material possesses a microporous (0.4-0.6 nrn) wall of hollow crystals and a mesoporous (5-17 mu) shell of nanovesicle with macropores (about 350 mu) in the core. This hierarchical structure enables excellent Fe2O3 dispersion (3-4 nm) and resistance to sintering even at 800 degrees C; facilitates the transport of reactant/products; and exhibits superior activity and resistance to leaching in phenol degradation. Hollow nanovesicle assembly of Fe-Pt bimetal-encapsulated hollow ZSM-5 crystals was also prepared.
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- 否
