Hierarchical composite catalysts were made with Zn ion-exchanged ZSM-5 and mesoporous alumina using conventional kneading method. Cracking and dehydrocyclization of n-hexane was performed using a fixed bed reactor in order to investigate the effects of the matrix on the catalytic activity and the product selectivity. Cracking of n-hexane and successive dehydrocyclization of formed olefins to produce aromatics proceeded at H₂ atmosphere and temperature 450–550 °C. The conversion of n-hexane and the aromatics selectivity enhanced with raising temperature and tended to increase with increasing the amounts of acid sites. When 10 wt% of alumina was used among catalysts with similar Zn content, the selectivity for aromatics reached maximum of about 42–45%, indicating that the optimal amount of alumina would exist to obtain the high selectivity and that the amount of ZnZSM-5 would be enough large to enhance aromatic compounds to the maximum. Reaction routes for aromatization of n-hexane could be proposed by assuming three routes of the initial cracking of n-hexane to C1 and C5, C2 and C4 and two molecules of C3, the successive cracking of the formed C5, and the final aromatization forming benzene, toluene and xylenes through Diels–Alder reactions of C2–C6 olefins.

使用常规的捏合方法，用锌离子交换的 ZSM-5 和介孔氧化铝制备了多级复合催化剂。裂化和脱氢环化Ñ为了研究对催化活性的基体和产物选择性的影响使用固定床反应器中进行正己烷。裂化的Ñ形成烯烃的己烷和连续脱氢环化到处于H进行生产芳烃₂气氛和温度450-550℃。n的换算正己烷和芳烃的选择性随着温度的升高而增强，并随着酸位点数量的增加而增加。当在 Zn 含量相似的催化剂中使用 10 wt% 的氧化铝时，芳烃的选择性达到最大值约 42-45%，表明存在最佳氧化铝量以获得高选择性，而 ZnZSM-5 的量将足够大以最大限度地增强芳香族化合物。用于芳构化反应的路线Ñ正己烷可以通过假设初始的裂化的三种途径提出Ñ己烷到C1和C5，C2和C4和C3的两个分子中，连续形成的C5的开裂，并最终形成芳通过 C2-C6 烯烃的 Diels-Alder 反应制备苯、甲苯和二甲苯。