Method for preparing perforation type zeolite material with multilevel pore canals

Abstract

This invention discloses a method for preparing multi-level porous cross-flow zeolite material. The method comprises: (1) dispersing zeolite microcrystal in water or inorganic salt solution to form colloidal solution; (2) soaking the multi-level porous cross-flow silica gel material in polyelectrolyte solution so that the surface of the modified backbone is charged; (3) soaking and washing the silica gel material obtained in step 2 in the colloidal solution obtained in step 1 under normal or negative pressure; (4) soaking the silica gel material obtained in step 3in the colloidal solution obtained in step 1 under normal or negative pressure, and performing secondary crystallization by using vapor phase method. The obtained multi-level porous cross-flow property and abundant macropores withhigh uniformity, and can be used in catalysis and adsorption-separation. It has obvious advantages against normal zeolite molecular sieve on catalyst, adsorbent, separating agent and water treatment.

Description

technical field [0001] The present invention relates to a preparation method of a zeolite material, and more particularly relates to a preparation method of a multi-stage channel through-flow zeolite material. Background technique [0002] As an inorganic porous material, zeolite has abundant micropores, molecular sieve selectivity and good thermal and hydrothermal stability, and is widely used in catalysis and separation processes. At present, the general preparation method of zeolite catalyst is: firstly crystallize a certain ratio of reactant material gel mixture at high temperature to obtain zeolite, then combine zeolite with a carrier with or without binder, and then form a finished catalyst product. In this way, the active component of the catalyst, zeolite, is dispersed in various parts of the catalyst body phase, but cannot be highly dispersed on the surface of the catalyst to fully exert its catalytic effect, and the diffusion limitation is introduced. In order to ...

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Problems solved by technology

[0005] Tang Yi et al. (CN 01126842.5) used diatomite as a carrier, formed a zeolite film on its surface through the nano-zeolite seed crystal layer-by-layer assembly method, and then grew it secondary under an organic amine atmosphere, thus forming a zeolite film on the diatomite. Zeolite material with a certain strength and multi-level pore structure, but the pores of zeolized diatomite are not interconnected, which will limit the diffusion

[0006] Hiroko Shikata et al. used the sol-gel method to load Silicalit-1 on a multi-level porous silica gel material (Journal of Sol-Gel Science and Technology, 19, 769-773, 2000), and later Takahashi et al. (EP 1 934 113 A2) used the vapor phase method to load Silicalit-1 and ZSM-5 zeolite in-situ on the hierarchical porous silica gel material, but these two loading methods could not make the zeolite evenly loaded on the hierarchical porous silica gel material. On flow-type silica gel materials, the size of zeolite grain growth cannot be effectively controlled, and the skeleton of part of the multi-stage channel through-flow silica gel material is destroyed during the preparation process.

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