A novel method for the preparation of MOR/MCM-41 composite molecular sieve

A MOR/MCM-41 composite molecular sieve has been hydrothermally synthesized through a novel process of the self-assembly of CTAB surfactant micelles with silica-alumina source which originates from the alkaline treatment of zeolite MOR and contains secondary building units characteristic of MOR besides the zeolite crystals. The composite possesses a bimodal mesopore system and the microporous structure of MOR and has shown higher catalytic activity in the hydrodealkylation of C10+ heavy aromatics than the mechanical mixture due to the introduction of zeolite secondary building units into the mesopore walls of the composite which gives rise to the improved hydrothermal stability and acidity.