Epoxidation of styrene on Si/Ti/SiO2 catalysts prepared by chemical grafting
文献类型：期刊论文
| 作者 | Yang, QH; Wang, SL; Lu, JQ; Xiong, G; Feng, ZC; Xin, Q; Li, C |
| 刊名 | applied catalysis a-general
 |
| 出版日期 | 2000-03-13 |
| 卷号 | 194期号:195页码:507-514 |
| 关键词 | chemical grafting titanium-silica epoxidation UV resonance Raman visible Raman styrene |
| 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. |
| 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 |
| 关键词[WOS] | silica mixed oxides ; titanium tetrachloride ; surfaces ; hydroperoxides ; cyclohexene ; olefins ; ticl4 ; beta |
| 收录类别 | SCI |
| 原文出处 | true |
| 语种 | 英语 |
| WOS记录号 | WOS:000085733200052 |
| 公开日期 | 2010-11-30 |
| 源URL | [http://159.226.238.44/handle/321008/91427]  |
| 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 | Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China |
| 推荐引用方式 GB/T 7714 | 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. |
| APA | Yang, QH.,Wang, SL.,Lu, JQ.,Xiong, G.,Feng, ZC.,...&Li, C.(2000).Epoxidation of styrene on Si/Ti/SiO2 catalysts prepared by chemical grafting.applied catalysis a-general,194(195),507-514. |
| MLA | Yang, QH,et al."Epoxidation of styrene on Si/Ti/SiO2 catalysts prepared by chemical grafting".applied catalysis a-general 194.195(2000):507-514. |
入库方式： OAI收割
来源：大连化学物理研究所
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