A kind of mordenite-beta molecular sieve-y molecular sieve composite material and its synthesis method

Abstract

The invention provides a mordenite-Beta molecular sieve-Y molecular sieve composite material and a synthesis method thereof. The mordenite-Beta molecular sieve-Y molecular sieve composite material contains a Y molecular sieve, a Beta molecular sieve and mordenite, takes a Y molecular sieve as a core, and the Beta molecular sieve and mordenite as a shell, and the Beta molecular sieve and mordenite coexist in the shell. The synthesis method of the composite molecular sieve material comprises the following steps: performing ultrasonic and thermal treatment to the nano-beta molecular sieve, nanometer mordenite and the Y molecular sieve, then mixing the treated zeolite mixture with inorganic base, distilled water, a template agent, an aluminum source and a silicon source, and synthesizing the mordenite-Beta molecular sieve-Y molecular sieve composite material by adopting a vapor phase method. The MOR-Beta-Y molecular sieve composite material has more reasonable acid property and pore distribution, and higher catalysis performance can be provided.

Description

technical field [0001] The invention belongs to the field of synthesis of molecular sieve catalytic materials, in particular to a mordenite / Beta molecular sieve / Y molecular sieve composite molecular sieve material and a synthesis method thereof. Background technique [0002] Zeolite molecular sieves are an important class of industrial catalytic materials, widely used in industrial catalytic reactions. However, with the advancement of technology and increasingly stringent environmental protection regulations, the disadvantages of a single type of zeolite, such as single pore size, weak acidity, low activity and poor selectivity, are gradually magnified. Composite molecular sieve is a composite molecular sieve with a special structure, which is a co-crystal formed by two or more molecular sieves, or a composite crystal with the structural characteristics of two or more molecular sieves. Due to the particularity of the composite molecular sieve structure, it has a more reason...

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Problems solved by technology

[0010] The above ternary composite molecular sieves also adopt a synthetic method similar to that of a single zeolite. The binding force between different zeolite components in the synthetic product is also weak, the structure is loose, or it is in a separated state, which is not conducive to the formation of composite channels; There are many components, and the ratio of various components in the product is difficult to control, which in turn affects the catalytic performance of the synthesized product.

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