BI-MICROPOROUS-MESOPOROUS COMPOSITE MOLECULAR SIEVE Y-BETA/ MCM-41 AND PREPARING METHOD THEREOF

摘要

A bi-microporous-mesoporous composite molecular sieve Y-Beta/MCM-41 and preparing method thereof are provided. The molecular sieve is compounded with bi-microporous zeolites Y and Beta and molecular sieve MCM-41. The Y and Beta microporous phases are tightly wrapped by MCM-41 hexagonal mesoporous phase. The method includes: using hexadecyl trimethyl ammonium bromide cationic surfactant and polyethylene glycol octylphenyl ether nonionic surfactant as templates, respectively introducing pretreated bi-microprous phase and synthesized mesoporous inorganic silicon source into the system, adjusting the pH value of the system with inorganic acid, then treating with hydrothermal crystallization to obtain bi-microporous-mesoporous composite molecular sieve Y-Beta/MCM-41. The ratio of silica to alumina and the microporous phase content in the molecular sieve can be adjusted, and the molecular sieve can be used without ion exchange.