Zeolite-containing hierarchical two-layered (ZC2L) catalysts were prepared by the gel skeletal reinforcement method. Their reactivity was estimated in catalytic cracking of low-density polyethylene (LDPE) at 590°C using a Curie point pyrolyzer method. In addition, the “relative activity” per amount of zeolite in the catalyst was calculated, and the relationship between the pore and acid properties of each catalyst was investigated. The results suggested that the presence of both mesopores and the strong acid sites of zeolite would be closely related to the increase in activity. ZSM-5-ZC2L catalysts showed much higher aromatics selectivity especially for toluene and p-xylene than ZSM-5 single and kaolin-mixed catalysts. In contrast to the cases of ZSM-5-containing catalysts, β-zeolite-containing catalysts and Y-zeolite-containing catalysts selectively produced i-olefins and i-paraffins, respectively. The product selectivity of the ZC2L catalyst was influenced by the size of the micropores of the zeolite while the hierarchical ZC2L catalysts with a small amount (26 wt%) of zeolite exhibited the higher activity than zeolite single catalysts.

采用凝胶骨架增强法制备了含沸石的分层两层（ZC2L）催化剂。它们的反应性是在 590°C 下使用居里点热解法在低密度聚乙烯 (LDPE) 催化裂化中评估的。此外，计算了催化剂中每单位沸石量的“相对活性”，并研究了每种催化剂的孔隙和酸性质之间的关系。结果表明，沸石中孔和强酸位的存在与沸石活性的增加密切相关。ZSM-5-ZC2L 催化剂显示出更高的芳烃选择性，尤其是对甲苯和p-二甲苯比ZSM-5单一和高岭土混合催化剂。与含 ZSM-5 的催化剂的情况相反，含 β-沸石的催化剂和含 Y-沸石的催化剂分别选择性地产生i-烯烃和i-链烷烃。ZC2L催化剂的产物选择性受沸石微孔尺寸的影响，而具有少量（26wt%）沸石的分级ZC2L催化剂比沸石单一催化剂表现出更高的活性。