Ultrasonic synthesis of silica-alumina nanomaterials with controlled mesopore distribution without using surfactants

	Ultrasonic synthesis of silica-alumina nanomaterials with controlled mesopore distribution without using surfactants
	Yao, N ; Xiong, GX ; Yeung, KL ; Sheng, SS ; He, MY ; Yang, WS ; Liu, XM ; Bao, XH
刊名	langmuir
	2002-05-14
卷号	18 期号:10 页码:4111-4117
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.
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
关键词[WOS]	molecular-sieves ; catalysts ; hydroisomerization ; hydrocracking ; oxidation ; mechanism
收录类别	SCI
原文出处	true
语种	英语
WOS记录号	WOS:000175500300048
公开日期	2010-11-30
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/85719]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
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
推荐引用方式 GB/T 7714	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.
APA	Yao, N.,Xiong, GX.,Yeung, KL.,Sheng, SS.,He, MY.,...&Bao, XH.(2002).Ultrasonic synthesis of silica-alumina nanomaterials with controlled mesopore distribution without using surfactants.langmuir,18(10),4111-4117.
MLA	Yao, N,et al."Ultrasonic synthesis of silica-alumina nanomaterials with controlled mesopore distribution without using surfactants".langmuir 18.10(2002):4111-4117.