Nano-class molecular sieve and its synthesizing process

Abstract

A nano-class molecular sieve MCM-49 with MWW topologic skeleton structure is prepared from SiO2, Al2O3, alkali, template agent (hexamethyleneimine) and water through proportioning, crystallizing for 12-240 hrs, washing in water, and drying. Its advantages are short period, and high output rate and high crystallinity.

Description

technical field

[0001] The invention relates to an MCM-49 molecular sieve and a synthesis method thereof, in particular to a nanoscale MCM-49 molecular sieve and a synthesis method thereof. Background technique

[0002] In 1993, Mobile Company reported the new catalytic material MCM-49 molecular sieve. The framework topology of MCM-49 is the same as that of MCM-22 molecular sieve, but there is a slight difference in the framework distribution of aluminum atoms. MCM-49 has shown higher activity than MCM-22 in some special catalytic reactions. For example, in the oxygen-free aromatization reaction of propylene, the conversion rate of benzene on MCM-49 is 7.16%, which is much higher than that of MCM-22. 2.64% of 22. Due to its unique structural properties and high thermal stability, MCM-49-supported catalysts show good performance in the fields of conversion of alkanes to olefins and aromatics, catalytic cracking, olefin isomerization, hydrocarbon alkylation, etc. catalytic ...