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题名: Ultrasound as a tool to synthesize nano-sized silica-alumina catalysts with controlled mesoporous distribution by a novel sol-gel process
作者: Yao, N;  Xiong, GX;  Sheng, SS;  He, MY;  Yang, WS;  Bao, XH
关键词: ultrasonic treatment ;  mesoporous distribution ;  silica-alumina ;  catalysts ;  sol-gel
刊名: CATALYSIS LETTERS
发表日期: 2002
卷: 78, 期:1-4, 页:37-41
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: A novel sol-gel process is used to synthesize mesoporous silica-alumina catalysts with controlled pore size distribution without using templates or pore-regulating agents. The nitrogen sorption analysis shows that the synthesized materials have high specific surface area in the range 587-692 m(2)/g and similar mesoporous distribution within 2-11 nm. Ultrasound is applied to prepare precursor silica-alumina Sol with narrow particle diameter distribution. By calculation, it is found that ultrasonic treatment is able to provide 22.94 kJ/mol energy, which is just in accordance with the weak bond's bonding energy. Based on the calculation result, it is proposed that the role of ultrasonic treatment followed by acid peptization is to provide energy to break down the weak bonds. After gelation, the regular and close packing of similar-sized sot particles is capable of formation of controlled-sized interstices which are the precursors of mesopores. Solid-state Al-27 MAS NMR and TEM are used to characterize the samples' structure and particle morphology. They show that most of the aluminum is located in the tetrahedral position in the present materials. According to TEM results, it is shown that the synthesized materials have spherical particles with size of about 15 nm.
关键词[WOS]: HYDROISOMERIZATION ;  ALUMINOSILICATES ;  HYDROCRACKING ;  TEXTURE ;  OLEFINS ;  ACID
语种: 英语
WOS记录号: WOS:000175691600006
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139098
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.Res Inst Petr Proc SINOPEC, Beijing 100083, Peoples R China

Recommended Citation:
Yao, N,Xiong, GX,Sheng, SS,et al. Ultrasound as a tool to synthesize nano-sized silica-alumina catalysts with controlled mesoporous distribution by a novel sol-gel process[J]. CATALYSIS LETTERS,2002,78(1-4):37-41.
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