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题名: Organo-bridged silsesquioxane titanates for heterogeneous catalytic epoxidation with aqueous hydrogen peroxide
作者: Wang, Yi Meng;  Magusin, Pieter C. M. M.;  van Santen, Rutger A.;  Abbenhuis, Hendrikus C. L.
关键词: organosilica support ;  titanate ;  silsesquioxane ;  epoxidation ;  aqueous ;  hydrogen peroxide ;  nonporous
刊名: JOURNAL OF CATALYSIS
发表日期: 2007-10-25
DOI: 10.1016/j.jcat.2007.07.023
卷: 251, 期:2, 页:453-458
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: Organo-bridged silsesquioxane titanates for heterogeneous catalytic epoxidation with aqueous hydrogen peroxide were synthesized through the acid-catalyzed hydrolysis and co-condensation of organotrialkoxysilane monomers and alpha,omega)-bis(trialkoxysilyl) alkane cross-linkers in ethanol-water solution, with subsequent titanium grafting. These hybrid catalysts show high activity and selectivity in the epoxidation of cyclooctene with both aqueous hydrogen peroxide and tert-butyl hydroperoxide (TBHP) as oxidants, although they are nonporous. The catalysts can be reused at least six times with no loss of activity with TBHP as the oxidant and at least four times (although with gradual activity loss) with aqueous H2O2 as the oxidant. Furthermore, the catalytic activities of these hybrid titanates relate to the nature and the composition of the starting materials. used. The epoxidation activity of the catalysts using aqueous H2O2 as the oxidant seems to increase with increasing carbon length in the starting organosilane cross-linkers. UV-vis DRS and XPS measurements indicate that tetrahedrally coordinated Ti species are the active centers. (C) 2007 Elsevier Inc. All rights reserved.
关键词[WOS]: SUPPORTED TITANIUM CATALYSTS ;  STRUCTURAL-CHARACTERIZATION ;  SELECTIVE OXIDATION ;  FUNCTIONAL-GROUPS ;  MIXED OXIDES ;  SILICA ;  CYCLOHEXENE ;  HYBRID ;  SPECTROSCOPY ;  ZEOLITE
语种: 英语
WOS记录号: WOS:000250605900021
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140679
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.Eindhoven Univ Technol, Schuit Inst Catalysis, NL-5600 MB Eindhoven, Netherlands
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Wang, Yi Meng,Magusin, Pieter C. M. M.,van Santen, Rutger A.,et al. Organo-bridged silsesquioxane titanates for heterogeneous catalytic epoxidation with aqueous hydrogen peroxide[J]. JOURNAL OF CATALYSIS,2007,251(2):453-458.
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