Abstract
High-silica faujasites prepared through hydrothermal treatment are compared with HZSM-5-type catalysts with almost the same Si Al lattice ratios in the conversions of toluene, m-xylene, and alkylation of benzene with ethylene. Disproportionation of m-xylene proceeds more intensively on Y-type zeolites than on ZSM-5 materials having practically equal or even higher active center concentration. The results confirm the predominant importance of the structural characteristics over the density factor for determining the differences in the disproportionation ability of these two types of zeolite catalysts with respect to alkylaromatics.
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