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题名: Ultrasonic synthesis of silica-alumina nanomaterials with controlled mesopore distribution without using surfactants
作者: Yao, N;  Xiong, GX;  Yeung, KL;  Sheng, SS;  He, MY;  Yang, WS;  Liu, XM;  Bao, XH
刊名: LANGMUIR
发表日期: 2002-05-14
DOI: 10.1021/la0116084
卷: 18, 期:10, 页:4111-4117
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Multidisciplinary ;  Chemistry, Physical ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Materials Science
英文摘要: A novel sol-gel process has been developed for the synthesis of amorphous silica-aluminas with controlled mesopore distribution without the use of organic templating agents, e.g., surfactant molecules. Ultrasonic treatment during the synthesis enables production of precursor sols with narrow particle size distribution. Atomic force microscopy analysis shows that these sol particles are spherical in shape with a narrow size distribution (i.e., 13-25 nm) and their aggregation during the gelation creates clusters containing similar sized interparticle mesopores. A nitrogen physiadsorption study indicates that the mesoporous materials containing different Si/Al ratios prepared by the new synthesis method has a large specific surface area (i.e., 587-692 m(2)/g) and similar pore sizes of 2-11 nm. Solid-state Al-27 magic angle spinning (MAS) NMR shows that most of the aluminum is located in the tetrahedral position. A transmission electron microscopy (TEM) image shows that the mesoporous silica-alumina consists of 12-25 nm spheres. Additionally, high-resolution TEM and electron diffraction indicate that some nanoparticles are characteristic of a crystal, although X-ray diffraction and Si-29 MAS NMR analysis show an amorphous material.
关键词[WOS]: MOLECULAR-SIEVES ;  CATALYSTS ;  HYDROISOMERIZATION ;  HYDROCRACKING ;  OXIDATION ;  MECHANISM
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000175500300048
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/85719
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Hong Kong Univ Sci & Technol, Dept Chem Engn, Hong Kong, Hong Kong, Peoples R China
3.SINOPEC, Res Inst Petr Proc, Beijing 100083, Peoples R China

Recommended Citation:
Yao, N,Xiong, GX,Yeung, KL,et al. Ultrasonic synthesis of silica-alumina nanomaterials with controlled mesopore distribution without using surfactants[J]. LANGMUIR,2002,18(10):4111-4117.
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