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题名: Direct synthesis of Al-SBA-15 mesoporous materials via hydrolysis-controlled approach
作者: Li, Y;  Zhang, WH;  Zhang, L;  Yang, QH;  Wei, ZB;  Feng, ZC;  Li, C
刊名: JOURNAL OF PHYSICAL CHEMISTRY B
发表日期: 2004-07-15
DOI: 10.1021/jp049824j
卷: 108, 期:28, 页:9739-9744
收录类别: SCI
文章类型: Article
项目归属: 506, 503
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: Aluminum-substituted mesoporous SBA-15 (Al-SBA-15) materials were directly synthesized by a hydrolysis-controlled approach in which the hydrolysis of the silicon precursor (tetraethyl orthosilicate, TEOS) is accelerated by fluoride or by using tetramethyl orthosilicate (TMOS) as silicon precursor rather than TEOS. These materials were characterized by powder X-ray diffraction (XRD), N-2 sorption isotherms, TEM, Al-27 MAS NMR, IR spectra of pyridine adsorption, and NH3-TPD. It is found that the matched hydrolysis and condensation rates of silicon and aluminum precursors are important factors to achieve highly ordered mesoporous materials. Al-27 MAS NMR spectra of Al-SBA-15 show that all aluminum species were incorporated into the silica framework for the samples prepared with the addition of fluoride. A two-step approach (sol-gel reaction at low pH followed by crystallization at high pH) was also employed for the synthesis of Al-SBA-15. Studies show that the two-step approach could efficiently avoid the leaching of aluminum from the framework of the material. The calcined Al-SBA-15 materials show highly ordered hexagonal mesostructure and have both Bronsted and Lewis acid sites with medium acidity.
关键词[WOS]: FRIEDEL-CRAFTS ALKYLATION ;  MOLECULAR-SIEVES ;  ALUMINUM ISOPROPOXIDE ;  PYRIDINE ADSORPTION ;  SURFACE-ACIDITY ;  POROUS TEXTURE ;  SILICA ;  SBA-15 ;  MCM-41 ;  FLUORIDE
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000222639900030
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/82277
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

Recommended Citation:
Li, Y,Zhang, WH,Zhang, L,et al. Direct synthesis of Al-SBA-15 mesoporous materials via hydrolysis-controlled approach[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2004,108(28):9739-9744.
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