Composite zeolite molecular sieve preparing method containing Y and Beta zeolite structures

Abstract

A composite zeolite molecular sieve preparing method containing Y and Beta zeolite structures belongs to the inorganic synthetic cellular material field. The invention is characterized by firstly configuring Y type guide agent by sodium aluminate, silicasol and sodium hydroxide; then synthesizing the stabilized colloidal sols containing Y type zeolite structure unit by the guide agent; adding appropriate silicon source and formwork agent in the colloidal sols; after crystallizing 2-12 days under 120 DEG C to 150 DEG C, then filtering, washing, drying and calcining to obtaine the composite zeolite molecular sieve preparing method containing Y and Beta zeolite structures. The molecular sieve not only has the structure and performance of Y type and Beta type zeolite molecular sieve, but also implements the reasonable collocation and the acid gradient allocation of two kinds of molecular sieve pore passage structures, thereby being contribute to implement the cooperating actions between Y type and Beta type zeolite molecular sieves, and the invention has potential application prospects on the fields of fine chemical industry and petroleum processing.

Description

technical field [0001] Y-type zeolite and beta-type zeolite are two molecular sieves widely used in petrochemical industry. Due to the characteristics of their structure and performance, they are widely used in many fields such as catalysis, adsorption and ion exchange. Background technique [0002] Y-type zeolite is formed by faujasite cages passing through twelve-membered rings along three crystal axis directions. In 1964, American scientist Breck successfully synthesized Y-type zeolite Si / Al=1.5-3.0, and played an important role in the catalytic conversion of alkanes. The invention of Y-type zeolite has epoch-making significance in the field of catalytic cracking. Based on NaY, a series of Y-type molecular sieves USY, REUSY, REHY, REY obtained through various modification methods constitute the main active components of fluid catalytic cracking (FCC) catalysts. [0003] Beta-type zeolite was first synthesized by Mobil Corporation in 1967, and is the only large-pore hig...

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Problems solved by technology

However, the preparation method of the Y / β double microporous composite zeolite molecular sieve reported at present is mainly to first synthesize a zeolite crystal grain, and then prepare a composite zeolite molecular sieve with a core-shell structure by changing the synthesis conditions, so its preparation process Difficult to achieve intergrowth or eutectic growth at the nano or mesoscopic level

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