Abstract
Hierarchical structure was successfully created in YNU-5 zeolite by a direct base-treatment. Although the unmodified YNU-5 catalyst was significantly deactivated by heavy coking in hexane cracking, the dealuminated catalyst was much less deactivated. Furthermore, the mesopore/micropore hierarchical structure in the YNU-5 zeolite catalyst suppressed deactivation more than the non-hierarchical, dealuminated YNU-5 with a similar Si/Al ratio. An increase in hexane conversion was also observed for the YNU-5 with hierarchical structure.