A kind of hierarchical pore structure zeolite adsorption/catalyst and its construction method

A technology of multi-level pores and catalysts, which is applied in the field of structuring of porous materials, can solve problems such as low use efficiency, nanopore blockage, and small relative volume, and achieve the effects of improving use efficiency, increasing zeolite volume fraction, and increasing reaction rate

Active Publication Date: 2020-12-25
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention provides a multi-level pore structure zeolite adsorption / catalyst and its construction method

Method used

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  • A kind of hierarchical pore structure zeolite adsorption/catalyst and its construction method
  • A kind of hierarchical pore structure zeolite adsorption/catalyst and its construction method

Examples

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Embodiment 1

[0018] Embodiment 1: the preparation of the zeolite adsorption / catalysis material of hierarchical porous structure in the present embodiment is realized according to the following steps: 1) take kaolin, bauxite as main raw material, MoO 3 As a sintering aid, according to (3Al 2 o 3 2SiO2 2 ) 0.9 (MoO 3 ) 0.1 Stoichiometric weighing, mixing, and using absolute ethanol as the medium, the volume ratio of powder and absolute ethanol is 1:2, ball milling for 20 hours; then drying and sieving to obtain a uniform mixed powder; 2) deionized Water, polyvinyl alcohol with 1% powder mass and mixed powder were ball milled for 24 hours to prepare a stable water-based ceramic slurry with a solid phase content of 10 vol%; 3) The stable slurry was dropped into -5°C through a vibrating dripping device In a small amount of corn oil, the amount of corn oil is about 500ml. By adjusting the vibration frequency and the pore size of the pillow, droplets of ceramic slurry with a particle size di...

Embodiment 2

[0021] Example 2: The difference between this embodiment and Example 1 is that the solid content of the water-based ceramic slurry in step 2) is 20vol% and 30vol% respectively, and other steps and parameters are the same as in Example 1.

Embodiment 3

[0022]Example 3: The difference between this embodiment and Example 1 is that the temperatures of the low-temperature oil phase in step 3) are respectively -15°C and -25°C, and other steps and parameters are the same as in Example 1.

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Abstract

The invention provides a zeolite adsorbent / catalyst with a hierarchical pore structure and a construction method thereof, and belongs to the technical field of catalysis / adsorption porous zeolite material structuring. The zeolite adsorbent / catalyst with the hierarchical pore structure and the construction method thereof aim to solve the problem that the use efficiency of an existing zeolite product is low due to the facts that the effective volume fraction is small, nano-pores are blocked, and falling is caused in the reaction process. According to the zeolite adsorbent / catalyst with the hierarchical pore structure and the construction method thereof, zeolite molecular sieves are uniformly distributed in a porous mullite fiber ceramic ball carrier and the surface of the porous mullite fiber ceramic ball carrier, the carrier is composed of a communicating pore channel with the aperture greater than 5 microns and mutually-crossed pores with the aperture less than 0.5 micron of mullite fibers, the mass fraction of zeolite is 20-30wt%, the average particle size of porous ceramic microspheres is 50 microns to 2 millimeters, the average sphericity is 90-100%, the apparent density is 0.5-1.2 g / cm<3>, and the overstock crushing strength is 0.5-3 MPa; and the communicating pore channel in the carrier provides a path for free movement and diffusion of reactants and products, in addition,the problem of blockage of zeolite nano-pores is avoided, and therefore the use efficiency of the zeolite is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of structuring porous materials used for catalysis / adsorption, and in particular relates to a zeolite adsorption / catalyst with a hierarchical porous structure and a construction method thereof. Background technique [0002] "Zeolite" is a crystalline aluminosilicate with a unique three-dimensional channel structure. Its pore structure depends on the shape and size of the pores. Therefore, according to the shape and size of the pores, zeolites have a certain selectivity for molecules entering the pores, so zeolites are also called molecular sieves. When some or all of the silicon (Si) or aluminum (Al) atoms in the structural framework of the zeolite molecule are replaced by other elements, porous high-silica zeolite molecular sieves, phosphorus-aluminum molecular sieves and BEA structures such as Ti and Zn in the framework will be formed. Molecular sieve. Because the pore sizes of zeolites and zeolite-like...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/18B01J20/28B01J20/30B01J29/00B01J35/10
CPCB01J20/18B01J20/28019B01J29/00B01J35/1004
Inventor 侯赵平张树志刘亮亮张长江
Owner TAIYUAN UNIV OF TECH
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