| 碱金属沸石上乙醇双分子缩合反应及其机理 |
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| 引用本文： | 杨春,孟中岳.碱金属沸石上乙醇双分子缩合反应及其机理[J].催化学报,1994,15(1):28-33. |
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| 作者姓名： | 杨春 孟中岳 |
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| 作者单位： | 南京师范大学化学系 |
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| 摘 要： | 首次发现在碱金属Ｘ沸石上乙醇能够发生以正丁醇为主产物的双分子缩合反应，在所研究的催化剂中，含Ｒｂ的ＬｉＸ沸石表现出较高的反应活性和选择性。反应机理的研究表明，反应不经过ａｌｄｏｌ缩合步骤。在此基础上，对反应机理提出了新建议：在碱性沸石作用下，乙醇的β－位Ｃ－Ｈ键被活化，双分子脱水导致缩合。碳链的增长按此模式进行。
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| 关 键 词： | 碱金属 沸石 乙醇 双分子缩合 沸石 |
| 收稿时间： | 1994-02-25 |
BIMOLECULAR CONDENSATION OF ETHANOL ON ALKALI ZEOLITESAND ITS REACTION MECHANISM |
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| Yang,Chun and Meng,Zhong-yue.BIMOLECULAR CONDENSATION OF ETHANOL ON ALKALI ZEOLITESAND ITS REACTION MECHANISM[J].Chinese Journal of Catalysis,1994,15(1):28-33. |
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| Authors: | Yang Chun and Meng Zhong-yue |
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| Abstract: | t has been found for the first time that ethanol can be conveiedmainly into 1-botanol by a bimolecular condensation on alkali zeolites.For this base-catalyzed reaction, Rb-LiX exhibits higher activity andselectivity for 1-butanol than Rb-NaX and Rb-KX. The reaction temperature and the contaCt time have obvious influence on the condensationactivity. A reaction mechanism is proposed, in which the C-H bond in0-POsition of one molecule of ethanol is activated by the alkali zeoliteand condensates with another molecule of ethanol to form 1-butanol.Thewhole reaction proceeds following this scheme to expend the carbon chain. |
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| Keywords: | lkali X zeolite base catalysis ethanol bimolecular condensation reaction mechanism |
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