Synthesis of Granular MCM-22 Zeolite with a Hierarchical Porous Structure

The study proposes a novel approach for the synthesis of granular MCM-22 zeolite with a hierarchical micro–meso–macroporous structure. This approach is based on the crystallization of zeolite granules consisting of powdered MCM-22 and synthetic amorphous aluminosilicate. The synthesized material had 97% crystallinity and volumes of micro-, meso-, and macropores of 0.18, 0.22, and 0.46 cm3/g, respectively. The H-form of the hierarchical MCM-22 exhibited high activity and selectivity in dimerization of α-methylstyrene.