β沸石在乙醇胺化反应中的催化行为

Catalytic Behaviour of Amination of C_2H_5OH with NH_3 over β Zeolite

考察了在不同硅铝比及P、Mg、La改性的β沸石上的乙醇胺化反应。结果表明:Mg改性的β沸石对该反应表现出优良的催化性能,该反应是在L酸中心上进行,乙胺和乙烯的选择性与样品的L酸相对强度有关,强L酸中心有利于乙醇胺化,弱L酸有利于乙醇自身脱水反应。

The dehydration-amination Of ethanol with ammonia was carried out over β zeolite with different Si/Al ratio and modified with P,Mg, La. Thee results show that β-zeolite modified with Mg has good catalytic activity. This reaction proceeds on L acid sites and the selectivity of ethamine and ethene has relation to the relative strength of L acid sites. The strong L acid sites on samples favour the amination of ethanol whereas the weak L acid sites on samples favour the dehydration of ethanol.