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Organo-bridged silsesquioxane titanates for heterogeneous catalytic epoxidation with aqueous hydrogen peroxide
Wang, Yi Meng; Magusin, Pieter C. M. M.; van Santen, Rutger A.; Abbenhuis, Hendrikus C. L.
KeywordOrganosilica Support Titanate Silsesquioxane Epoxidation Aqueous Hydrogen Peroxide Nonporous
Source PublicationJOURNAL OF CATALYSIS
2007-10-25
DOI10.1016/j.jcat.2007.07.023
Volume251Issue:2Pages:453-458
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Physical ; Engineering, Chemical
WOS Research AreaChemistry ; Engineering
WOS KeywordSUPPORTED TITANIUM CATALYSTS ; STRUCTURAL-CHARACTERIZATION ; SELECTIVE OXIDATION ; FUNCTIONAL-GROUPS ; MIXED OXIDES ; SILICA ; CYCLOHEXENE ; HYBRID ; SPECTROSCOPY ; ZEOLITE
AbstractOrgano-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.
Language英语
WOS IDWOS:000250605900021
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/140679
Collection中国科学院大连化学物理研究所
Affiliation1.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
GB/T 7714
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.
APA Wang, Yi Meng,Magusin, Pieter C. M. M.,van Santen, Rutger A.,&Abbenhuis, Hendrikus C. L..(2007).Organo-bridged silsesquioxane titanates for heterogeneous catalytic epoxidation with aqueous hydrogen peroxide.JOURNAL OF CATALYSIS,251(2),453-458.
MLA Wang, Yi Meng,et al."Organo-bridged silsesquioxane titanates for heterogeneous catalytic epoxidation with aqueous hydrogen peroxide".JOURNAL OF CATALYSIS 251.2(2007):453-458.
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