One-step synthesis of hierarchical ZSM-5 zeolites and their catalytic performance on the conversion of methanol to aromatics

Abstract

Hierarchical ZSM-5 zeolites were successfully prepared with one-step hydrothermal method by adding MTES to the zeolite precursor. The mesoporous structure of zeolite was formed via organosilane interacts with nanoparticles to form a covalent bond of Si–R, and then the alkyl group was removed by calcination. The influence of methyltriethoxysilane on the mesopores, acidity, morphology of the zeolites, and the catalytic performance of the samples was investigated. A mesoporous size about 6.5 nm was formed in the sample, meanwhile, the Bronsted acid density of zeolite was decreased. The yield of the aromatic compound was increased by about 10% after the introduction of the mesoporous structure. The catalyst’s carbon deposition resistance was improved due to a significant decrease of the Bronsted acid density of zeolite, and the catalyst life (methanol conversion rate > 95%) was extended from 41 to 76 h.