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题名: Epoxidation of styrene on Si/Ti/SiO2 catalysts prepared by chemical grafting
作者: Yang, QH;  Wang, SL;  Lu, JQ;  Xiong, G;  Feng, ZC;  Xin, Q;  Li, C
关键词: chemical grafting ;  titanium-silica ;  epoxidation ;  UV resonance Raman ;  visible Raman ;  styrene
刊名: APPLIED CATALYSIS A-GENERAL
发表日期: 2000-03-13
卷: 194, 期:195, 页:507-514
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 503
WOS标题词: Science & Technology ;  Physical Sciences ;  Life Sciences & Biomedicine
类目[WOS]: Chemistry, Physical ;  Environmental Sciences
研究领域[WOS]: Chemistry ;  Environmental Sciences & Ecology
英文摘要: Titania-silica (Ti/SiO2) and silica-titania-silica (Si/Ti/SiO2) catalysts were:prepared by chemical grafting using TiCl4 and tetraethyl orthosilicate (TEOS) as precursors and SiO2 as support. The prepared catalysts were characterized by UV Raman and visible Raman spectroscopies, XRD and the epoxidation of styrene; Ti/SiO2: catalyst grafted with only titanium species is not very active for epoxidation using H2O2 (30%), but is active and-selective when one uses tert-butyl hydroperoxide (TBHP). The catalyst grafted at high temperatures shows better epoxide selectivity. Si/Ti/SiO2 catalyst, the titanium-silica grafted further with TEOS, is active and selective for the epoxidation of styrene using either dilute H2O2 or TBHP, possibly due to the fact that the grafting of Ti/SiO2 with TEOS modifies the coordination structure of titanium and makes the titanium sites of Si-O-Ti-O-Si species less hydrophilic. A characteristic band at 1085cm(-1) due to Ti-O-Si species is detected for the grafted catalysts by UV resonance Raman spectroscopy. Reaction between TiCl4 and SiO2 at high temperatures favors the formation of Ti-O-Si species. Better activity and selectivity to epoxide,is found for the catalysts with more Ti-O-Si species. It is assumed that the active sites are the highly isolated Ti-O-Si species. For Si/Ti/SiO2 catalyst, the gas phase O-2 can participate in the catalytic oxidation of styrene when H2O2 is present ana:ii causes the formation of benzaldehyde. (C) 2000 Elsevier Science B.V. All rights reserved.
关键词[WOS]: SILICA MIXED OXIDES ;  TITANIUM TETRACHLORIDE ;  SURFACES ;  HYDROPEROXIDES ;  CYCLOHEXENE ;  OLEFINS ;  TICL4 ;  BETA
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000085733200052
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/91427
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:
Yang, QH,Wang, SL,Lu, JQ,et al. Epoxidation of styrene on Si/Ti/SiO2 catalysts prepared by chemical grafting[J]. APPLIED CATALYSIS A-GENERAL,2000,194(195):507-514.
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