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ZSM-5型分子筛由于它的高表面积、择形催化性能、独特的表面酸性和对甲醇转化为烃类特有的催化活性,引起了广泛的兴趣.在其骨架的基础上进行了各种改性研究,或用Ga、Fe、Zn、B和Ti等代替骨架中的Al或Si原子,或用离子交换改变可交换的阳离子,或在分子筛表面覆盖适量的各种氧化物,从而获得合适的孔径和适当的表面酸碱性能,以达到提高催化剂的反应活性和选择性以及防止结炭等副反应发生的目的.
ZSM-5 type zeolites have attracted a great deal of interest due to their high surface area, shape-selective catalytic properties, unique surface acidity, and their catalytic activity for the conversion of methanol to hydrocarbons. Various modifications have been made on the basis of their backbone Research or replacement of Al or Si atoms in the framework with Ga, Fe, Zn, B, Ti or the like or ion exchange to change exchangeable cations or covering the surface of the molecular sieve with a suitable amount of various oxides to obtain a suitable pore size And appropriate surface acid-base properties, in order to achieve the purpose of improving the reactivity and selectivity of the catalyst and preventing side reactions such as carbon formation.