Preparation method for metal-based MFI type zeolite molecular sieve film

Abstract

The invention discloses a preparation method for a metal-based MFI type zeolite molecular sieve film composite catalytic material. According to the method, a Silicalite-1 zeolite film crystal seed layer is prepared on a stainless steel carrier; metal nanoparticles are deposited on the crystal seed coating surface through an electrochemistry method; the MFI type zeolite molecular sieve film is secondarily grown on the crystal seed coating; the metal-based MFI type zeolite molecular sieve film is prepared through calcination. The electrodeposited metal nanoparticles are embedded in the crystal gaps in the crystal seed layer, the zeolite film prepared through the secondary hydrothermal synthesis has characteristics of continuity, compactness and no crack, and is solidly combined with the carrier so as to improve mechanical vibration resistance and heat conductivity of the coating. With the prepared metal-based zeolite molecular sieve film composite material through the method provided bythe present invention, the transmission flux of the coating material to the material can be effectively improved, the problem of discontinuity of the zeolite molecular sieve film due to defects or calcination is solved, the combination strength of the zeolite molecular sieve film and the metal matrix is enhanced.

Description

technical field [0001] The invention relates to a method for preparing a zeolite molecular sieve membrane, in particular to a method for preparing a high-temperature resistant, dense and defect-free MFI type zeolite molecular sieve membrane coating on a metal carrier. Background technique [0002] The research on the synthesis of catalyst film on the metal surface has aroused widespread interest. The research of this kind of material can not only broaden its application range, but also may be superior to granular catalyst in terms of processing and use performance, and can be used as a catalytic distillation element. , can also be used as heterogeneous catalysts for catalytic processes that require a large amount of treatment, fast mass transfer and heat transfer, and are expected to be applied in some important chemical fields. Molecular sieve membrane catalyst is a special inorganic membrane catalyst. As we all know, molecular sieve is a catalyst with unique performance, ...

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Problems solved by technology

Louisis proposes to prepare ZSM-5 zeolite coating (B.Lousis, P.Reuse, L.Kiwi-Minsker and A.Renken, Appl.Catal.A: General, 2001, 201 on the stainless steel grid carrier with in-situ growth method , 103); Khoo Daw Deeng etc. directly crystallized and grown ZSM-5 molecular sieves on porous metal supports for the removal of nitrogen oxides, carbon monoxide and hydrocarbons (Khoo Daw Deeng, Abdul Rahman Mohamed, Subhash Bhatia.Process optimization studies of structured Cu-ZSM-5 zeolite catalyst for the removal of NO using design of experiments (DOE). Chemical Engineering Journal 103 (2004) 147-157.) However, the uniformity of the metal-based zeolite molecular sieve membrane coating prepared by these methods , the bonding strength with the metal carrier, the thickness and thermal conductivity of the molecular sieve membrane are difficult to control

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