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题名: On the nature of reaction-controlled phase transfer catalysts for epoxidation of olefin: a P-31 NMR investigation
作者: Chen, YY;  Zhuang, JQ;  Liu, XM;  Gao, JB;  Han, XW;  Bao, XH;  Zhou, N;  Gao, S;  Xi, ZW
关键词: reaction-controlled phase transfer ;  epoxidation ;  P-31 NMR ;  heteropoly tungstophosphates
刊名: CATALYSIS LETTERS
发表日期: 2004-03-01
卷: 93, 期:1-2, 页:41-46
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: p-C5H5NC16H33](3)[PW4O16] was reported to be an excellent epoxidation catalyst which exhibited a unique reaction-controlled phase transfer behavior. In the paper, the composition and structural changes of the reaction-controlled phase transfer catalyst during and after reaction have been investigated by P-31 NMR spectroscopy. The P-31 MAS NMR confirmed that the original catalyst was a mixture of heteropoly tungstophosphates. When the catalyst reacted with hydrogen peroxide, the 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-) were detected by in situ P-31 NMR. It was also found that the P/W ratios and quaternary ammonium cations had great influence on the composition of heteropoly tungstophosphates. Although the catalyst with [(C18H37)(2)N(CH3)(2)](+) was not a reaction-controlled phase transfer catalyst, it could be precipitated from the reaction solution when acetone was subsequently added to the solution. The P-31 MAS NMR spectra of the recovered catalysts revealed that they had more low P/W ratio heteropoly tungstophosphates than fresh catalysts.
关键词[WOS]: HYDROGEN-PEROXIDE ;  BIPHASE MEDIUM ;  SILICA ;  OXIDATIONS ;  POLYOXO ;  SYSTEM
语种: 英语
WOS记录号: WOS:000189103200009
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139589
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:
Chen, YY,Zhuang, JQ,Liu, XM,et al. On the nature of reaction-controlled phase transfer catalysts for epoxidation of olefin: a P-31 NMR investigation[J]. CATALYSIS LETTERS,2004,93(1-2):41-46.
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