Nanometer hollow H type ZSM-5 molecular sieve, and preparation method thereof

Abstract

The invention belongs to the field of catalytic material preparation, and more specifically relates to a nanometer hollow H type ZSM-5 molecular sieve, and a preparation method thereof. The preparation method comprises following steps: a Na type molecular sieve is added into an inorganic aqueous alkali for treatment, ice-water cooling, centrifugation washing, and drying are carried out, ammonium exchange is adopted, sintering is carried out so as to obtain the H type ZSM-5 molecular sieve (HZSM-5) with a nanometer hollow structure. The preparation method is short in synthesis period, and simple in technology process. The H type ZSM-5 molecular sieve prepared using the preparation method possesses a nanometer scale meso pore-micropore multistage pore composite structure; the specific surface area and the exterior surface area are larger; and the H type ZSM-5 molecular sieve can be used in a plurality of catalytic reactions as a catalyst or an active component carrier material.

Description

technical field [0001] The invention belongs to the field of preparation of catalytic materials, in particular to a nano hollow H-type ZSM-5 molecular sieve and a preparation method thereof. Background technique [0002] ZSM-5 molecular sieve catalyst has high specific surface area, regular pore structure and adjustable surface acidity, and is widely used in petroleum refining, fine chemical industry, gas separation and purification and other fields. It can be directly used as an adsorption or catalytic material, and can also be used as a support material for a variety of supported catalysts for a variety of catalytic reactions such as C4 alkylation, NO x Selective catalytic reduction, VOCs catalytic oxidation, etc. [0003] In the catalytic reaction, the catalytic performance of ZSM-5 molecular sieve is closely related to its grain size, specific surface area, pore structure, acidity and other physical and chemical parameters; especially in the catalytic cracking of long-c...

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Problems solved by technology

[0003] In the catalytic reaction, the catalytic performance of ZSM-5 molecular sieve is closely related to its grain size, specific surface area, pore structure, acidity and other physical and chemical parameters; especially in the catalytic cracking of long-chain alkanes, C4 alkylation, low-temperature catalytic oxidation of volatile organic compounds In reactions such as ZSM-5, the service life of ZSM-5 molecular sieves is easily affected by factors such as its surface structure, thermal stability, acidic carbon and other reaction intermediate species, which will lead to a decrease in its catalytic performance or even inactivation.

Although high-temperature calcination of deactivated molecular sieve catalytic materials is an important means to achieve local regeneration of their active sites, high-temperature calcination will also cause changes in molecular sieve structure and surface properties, especially for noble metal or metal oxide-supported ZSM-5 catalysts. The process will cause the agglomeration and sintering of metal particles, resulting in irreversible complete deactivation of catalytic activity.

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