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ZSM-5分子筛由于具有独特的择形性、良好的水热稳定性、耐酸和抗积碳性能,因而被广泛应用于芳构化过程。综述了国内外对ZSM-5分子筛芳构化催化剂的改性方法。Zn的加入不仅能促进低碳烃的芳构化反应,而且能增强催化剂的抗积碳性能。随着磷的引入,液体收率增加,芳烃含量增加。Ga离子交换改性的ZSM-5对低碳烃类的芳构化有明显的催化作用。P-Zn/HZSM-5催化剂不仅表现出较高的初活性,而且具有良好的稳定性。经水热处理的ZSM-5分子筛具有良好的芳构化稳定性。纳米HZSM-5沸石催化剂具有很强的烃类转化能力,烃类通过芳构化、异构化和烷基化等反应转化为高辛烷值的异构烷烃和芳烃。
ZSM-5 zeolite has been widely used in the aromatization process due to its unique shape selectivity, good hydrothermal stability, acid resistance and anti-carbon deposition. The modification methods of ZSM-5 molecular sieve aromatization catalyst are summarized. Addition of Zn can not only promote the aromatization of low-carbon hydrocarbons, but also enhance the anti-carbon deposition of the catalyst. With the introduction of phosphorus, liquid yield increased, aromatic content increased. Ga ion exchange modified ZSM-5 has a significant catalytic effect on the aromatization of low-carbon hydrocarbons. The P-Zn / HZSM-5 catalyst not only shows higher initial activity but also has good stability. The hydrothermally treated ZSM-5 zeolite has good aromatization stability. Nano-HZSM-5 zeolite catalyst has a strong ability to convert hydrocarbons, hydrocarbons through aromatization, isomerization and alkylation reactions into high-octane isoparaffin and aromatics.