A spectroscopic study on the reaction-controlled phase transfer catalyst in the epoxidation of cyclohexene
文献类型：期刊论文
| 作者 | Gao, JB; Chen, YY; Han, B; Feng, ZC; Li, C; Zhou, N; Gao, SA; Xi, ZW |
| 刊名 | journal of molecular catalysis a-chemical
 |
| 出版日期 | 2004-03-01 |
| 卷号 | 210期号:1-2页码:197-204 |
| 关键词 | reaction-controlled phase transfer catalysis epoxidation cyclohexene polyoxometalates (POMs) biphasic catalytic system |
| 英文摘要 | the epoxidation of cyclohexene with hydrogen peroxide in a biphase medium (h2o/chcl3) was carried out with the reaction-controlled phase transfer catalyst composed of quaternary ammonium heteropolyoxotungstates [pi-c5h5n(ch2)(15)ch3](3)[pw4o16]. a conversion of about 90% and a selectivity of over 90% were obtained for epoxidation of cyclohexene on the catalyst. the fresh catalyst, the catalyst under reaction conditions and the used catalysts were characterized by ft-ir, raman and (pnmr)-p-31 spectroscopy. it appears that the insoluble catalyst could degrade into smaller species, [(po4){wo(o-2)(2)}(4)](3-), [(po4){wo(o-2)(2)}(2){wo(o-2)(2)(h2o)}](3-), and [(po3(oh)){wo(o-2)(2)}(2)](2-) after the reaction with hydrogen peroxide and becomes soluble in the chcl3 solvent. the active oxygen in the [w2o2(o-2)(4)] structure unit of these soluble species reacts with olefins to form the epoxides and consequently the corresponding w-ob-w (comer-sharing) and w-oc-w (edge-sharing) bonds are formed. the peroxo group [w2o2(o-2)(4)] can be regenerated when the w-ob-w and w-oc-w bonds react with hydrogen peroxide again. these soluble species lose active oxygen and then polymerize into larger compounds with the w-ob-w and w-oc-w bonds and then precipitate from the reaction solution after the hydrogen peroxide is consumed up. part of the used catalyst seems to form more stable compounds with keggin structure under the reaction conditions. (c) 2003 elsevier b.v. all rights reserved. |
| WOS标题词 | science & technology ; physical sciences |
| 类目[WOS] | chemistry, physical |
| 研究领域[WOS] | chemistry |
| 关键词[WOS] | manganese-containing polyoxometalate ; hydrogen-peroxide ; molecular-oxygen ; alkene epoxidation ; oxidative cleavage ; crystal-structures ; terminal olefins ; aromatic-amines ; ts-1 zeolite ; complexes |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000188740000025 |
| 公开日期 | 2015-11-10 |
| 源URL | [http://159.226.238.44/handle/321008/139354]  |
| 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 | Gao, JB,Chen, YY,Han, B,et al. A spectroscopic study on the reaction-controlled phase transfer catalyst in the epoxidation of cyclohexene[J]. journal of molecular catalysis a-chemical,2004,210(1-2):197-204. |
| APA | Gao, JB.,Chen, YY.,Han, B.,Feng, ZC.,Li, C.,...&Xi, ZW.(2004).A spectroscopic study on the reaction-controlled phase transfer catalyst in the epoxidation of cyclohexene.journal of molecular catalysis a-chemical,210(1-2),197-204. |
| MLA | Gao, JB,et al."A spectroscopic study on the reaction-controlled phase transfer catalyst in the epoxidation of cyclohexene".journal of molecular catalysis a-chemical 210.1-2(2004):197-204. |
入库方式： OAI收割
来源：大连化学物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。