高等学校化学学报 ›› 1989, Vol. 10 ›› Issue (5): 501.

• 研究论文 • 上一篇    下一篇

分子筛在乙醇脱水氨化反应中的一些催化行为

胡颖, 蒋大振, 吕慧娟, 戴继周, 范曙光   

  1. 吉林大学化学系
  • 收稿日期:1987-11-06 出版日期:1989-05-24 发布日期:1989-05-24
  • 通讯作者: 蒋大振

Catalysis of Zeolites in Dehydrative Amination of Ethanol with Ammonia

Hu Ying, Jiang Dazhen, Lu Huijuan, Dai Jizhou, Fan Shuguang   

  1. Department of Chemistry, Jilin Unirersity, Changchun
  • Received:1987-11-06 Online:1989-05-24 Published:1989-05-24

摘要: 研究了常压、300~400℃温度范围内在分子筛作用下乙醇和氨的脱水胺化反应,用IR和TPD技术表征其表面酸性。发现分子筛窗口和孔道减小时,二乙胺和三乙胺生成量下降,氢型和碱金属阳离子交换的ZSM-5具有明显的择形作用。乙醇转化率与分子筛表面酸量有关。分子筛上的L酸中心可能是脱水氨化反应的主要活性中心。分子筛上的B酸中心似乎对副反应更有利。

关键词: 沸石, 催化作用, 表面酸性, 脱水胺化

Abstract: The dehydrative amination of ethyl alcohol with ammonia was studied over some zeolites at a temperature of 300-400℃ under ambient pressures. Infrared spectrometry and temperature programmed desorption have been used to characterize the acidic properties of zeolites. It is found that the formation of diethylamine(DEA) and triethylamine(TEA) were suppressed with reducing the dimensions of pore openings and channels of zeolites; proton or alkali-metal ion-exchanged ZSM-5 show considerable shape-selectivity. Besides, the conversion of ethanol have been found to be dependent on the amount of surface acid sites on zeolites. The Lewis acid sites on zeolites perhaps are major active sites for the dehydrative amination reaction. The Bronsted acid sites on zeolites seems to favour the by-reaction.

Key words: Zeolite, Dehydrative amination, Surface acid, Catalysis

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