Abstract
This chapter discusses the enhancement of the shape selectivity of nanocrystalline HZSM-5 zeolite through comprehensive modifications. Fine tuning of a nano-HZSM-5 is achieved by systematic modifications. Evaluations are made through analyzing zeolitic overall acid strength, external surface acid sites and microporous geometric constraints, and shape selectivity in ethylbenzene ethylation. Nano-ZSM-5 can be trimmed into highly shape-selective catalyst by exploiting the synergic effect of zeolitic overall acid strength suppression, microporous geometric constraints regulation, and external acid sites passivation.
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