A ZSM-5 molecular sieve, a preparing method thereof and applications of the molecular sieve

Abstract

A ZSM-5 molecular sieve, a preparing method thereof and applications of the molecular sieve are provided. The ZSM-5 molecular sieve is prepared through an amine-free system. A silica-alumina ratio of the ZSM-5 molecular sieve is 40-200. The ZSM-5 molecular sieve is prepared by adopting a nanometer thin-layer ZSM-5 molecular sieve having a high silica-alumina ratio as a crystal seed with the mole ratio of raw materials meeting a condition that the mole ratio of SiO2 to Al2O3 is 100:(0.04-2). Compared with molecular sieves synthesized under traditional template-free conditions, the ZSM-5 molecular sieve synthesized by the method is a molecular sieve having a high silica-alumina ratio (higher than 40). The silica-alumina ratio of the prepared flake ZSM-5 molecular sieve is adjustable in a large range (40-200).

Description

technical field [0001] The invention relates to the field of molecular sieve preparation, in particular to a ZSM-5 molecular sieve and its preparation method and application. Background technique [0002] Among porous materials, ZSM-5 zeolite molecular sieves are widely used in ion exchange, adsorption, And separation, petrochemical and fine chemical synthesis and other fields. Patents CN1699173, CN1247457C, CN101723405A, etc. have adopted different organic amine (ammonium) templates to synthesize ZSM-5 molecular sieves, but generally synthesized silica-alumina zeolite molecular sieves, the price of organic templates is more expensive, which increases the synthesis cost of zeolite; The open pore structure can only be obtained after high-temperature calcination to remove the organic template. Generally, high-temperature calcination at 500-600 ° C consumes a lot of energy and destroys the crystal structure of zeolite molecular sieves to a certain extent (such as framework dea...

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Problems solved by technology

But for ZSM-5 molecular sieves, it is usually easy to synthesize aluminum-rich and low-silicon molecular sieves under the condition of no template, and the molar silicon-aluminum ratio usually cannot exceed 40, and the product size is generally larger than the seed crystal molecular sieve, and the crystal grains are larger and easy to agglomerate;

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