【摘要】 沸石分子筛的酸性特征在很大程度上决定着分子筛的应用方向,增强分子筛的酸性在一些情况下变得十分必要。简单回顾了分子筛的发展历程,对常规脱铝、化学气相沉积二氧化硅、负载强酸、柠檬酸修饰、等离子体处理等增强分子筛酸性的方法进行评述。分析了相关酸性增强的机理,指出不同处理方法的作用机理各不相同,引起分子筛结构的不同变化,进一步影响着酸性的变化。更多还原

【Abstract】 Acidity is a very important character of zeolites, which determines the application of zeolites in catalysis. In some cases, the enhancement of zeolite acidity becomes important and necessary. After a brief introduction on development of zeolites , the methods for enhancement of zeolite acidity are reviewed, including the modification of zeolites using conventional dea-lumination, chemical vapour deposition of silica, loading with strong acid, citric modification and plasma treatment. The nature of every method is different from each other, leading to different changes in structure of zeolites, and further affecting the acidity of zeolites.更多还原