Architecture-Dependent Distribution of Mesopores in Steamed Zeolite Crystals as Visualized by FIB-SEM Tomography

摘要

Zeolites are one of the major pillars of the petrochemical industry. Their precisely defined porous system, resistance towards harsh reaction conditions, and excellent acidic properties make them indispensible in many catalytic processes. A handful of industrially relevant zeolites, including zeolite Y and ZSM-5, are extensively used in processes such as hydrocarbon cracking, isomerization, and alkyla-tion. Therefore, as the unique catalytic properties of zeolites rely to a great extent on molecular diffusion and accessibility of acid sites, a great number of studies has focused on the improvement of these properties. Examples include the synthesis of nanocrystals and exfoliating layered zeolites. Although the above-mentioned methods allow the fine tuning of the material accessibility, the synthesis complexity and related costs most probably exceeds the costs of industrially applicable materials.