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Porous zeolite molecular sieve coating material on surface of silicon carbide ceramics and preparation method thereof

A technology of zeolite molecular sieve and silicon carbide ceramics, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of low utilization rate of zeolite crystals, and achieve the effects of uniform loading, firm combination, and improved utilization rate

Active Publication Date: 2011-03-30
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a silicon carbide ceramic surface porous zeolite molecular sieve coating material and its preparation method, to solve the problem that the zeolite molecular sieve coating prepared in the prior art is relatively dense, and the reactants can only rely on the micropores in the zeolite crystal for mass transfer. , low utilization rate of zeolite crystals and other issues

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  • Porous zeolite molecular sieve coating material on surface of silicon carbide ceramics and preparation method thereof
  • Porous zeolite molecular sieve coating material on surface of silicon carbide ceramics and preparation method thereof
  • Porous zeolite molecular sieve coating material on surface of silicon carbide ceramics and preparation method thereof

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Embodiment 1

[0041] The preparation method of the silicalite-1 type zeolite molecular sieve coating material on the surface of foamed silicon carbide ceramics (in this embodiment, the surface micropore size of silicon carbide is 0.1 to 2 microns):

[0042] First, a zeolite precursor sol is prepared. Mix ethyl orthosilicate, tetrapropylammonium hydroxide, and deionized water in a molar ratio of 1:0.32:29. After complete hydrolysis of ethyl orthosilicate, hydrothermal synthesis was carried out at 120°C for 4 hours in a reaction kettle. Immerse the foamed silicon carbide carrier in the zeolite precursor sol prepared by the above method, shake off the excess sol with a centrifuge, and dry at room temperature for 12 hours. The thickness of the zeolite precursor sol is 1-2 microns. To prepare a secondary growth solution, mix ethyl orthosilicate, tetrapropylammonium hydroxide, and deionized water in a molar ratio of 1:0.112:110. Put the foamed silicon carbide ceramics into the above solution, t...

Embodiment 2

[0044] The preparation method of ZSM-5 type zeolite molecular sieve coating material on the surface of foamed silicon carbide ceramics (in this embodiment, the surface micropore size of silicon carbide is 0.1 to 2 microns):

[0045] The preparation method of the zeolite precursor sol and the method of prefabricating the sol on the carrier surface are the same as in Example 1. To prepare secondary growth solution, ethyl orthosilicate, tetrapropylammonium hydroxide, aluminum nitrate, and deionized water are mixed in a molar ratio of 1:0.224:0.016:110. The specific preparation process is as follows: ethyl orthosilicate, tetrapropylammonium hydroxide Propyl ammonium hydroxide and deionized water were mixed in proportion. After the ethyl orthosilicate in the above solution was completely hydrolyzed, aluminum nitrate was added and stirring continued for 60 minutes. Put the foamed silicon carbide ceramics into the above solution, the weight ratio of the foamed silicon carbide ceramic...

Embodiment 3

[0047] The preparation method of the TS-1 type zeolite molecular sieve coating material on the surface of honeycomb silicon carbide ceramics (in this embodiment, the surface micropore size of silicon carbide is 0.1-2 microns):

[0048] The preparation method of the zeolite precursor sol and the method of prefabricating the sol on the carrier surface are the same as in Example 1. Prepare the secondary growth solution, mix ethyl orthosilicate, tetrapropylammonium hydroxide, titanium sulfate, and deionized water in a molar ratio of 1:0.336:0.015:110, and the specific preparation process is as follows: mix ethyl orthosilicate, tetrapropylammonium hydroxide Propyl ammonium hydroxide and deionized water were mixed in proportion. After the ethyl orthosilicate in the above solution was completely hydrolyzed, titanium sulfate was added and stirring continued for 30 minutes. Put the honeycomb silicon carbide ceramics into the above solution, the weight ratio of the foamed silicon carbid...

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Abstract

The invention belongs to the field of catalysis of zeolite crystals, in particular to a porous zeolite molecular sieve coating material on a surface of silicon carbide ceramics and a preparation method thereof. The zeolite molecular sieve coating is uniformly loaded on the surface of a porous silicon carbide ceramics carrier, and the zeolite molecular sieve coating has a double-pore canal structure composed of micropores of zeolite molecular sieves and macropores formed by mutual overlapping of zeolite crystals. The preparation method comprises the following steps: coating a zeolite precursor sol layer on the surface of porous silicon carbide ceramics, wherein the mol ratio of ethyl orthosilicate, tetrapropyl ammonium hydroxide and de-ionized water is 1:0.1-1.0:29; and growing in a secondary growth solution, wherein the mol ratio of ethyl orthosilicate, tetrapropyl ammonium hydroxide and de-ionized water is 1:0.05-1.0:110. Micron-sized pore canals are formed among the zeolite crystals in the coating, thereby improving the utilization efficiency of the zeolite coating. At the same time, the method has the advantages of simple process and low energy consumption, and the prepared zeolite molecular sieve coating is uniformly loaded and stably combined.

Description

technical field [0001] The invention belongs to the field of zeolite crystal catalysis, and in particular relates to a silicon carbide ceramic surface porous zeolite molecular sieve coating material and a preparation method thereof. Background technique [0002] Zeolite crystals are crystalline aluminosilicates with a uniform crystal structure characterized by many regular pores interconnected by a large number of small rectangular channels. It has been found that, due to their structure consisting of a network of interconnected pores and channels of uniform size, crystalline molecular sieves are able to absorb molecules of a size below some suitably specified value, while rejecting molecules of larger size, hence their name "Zeolite Molecular Sieves". Zeolite molecular sieves are widely used as catalysts, catalyst supports and adsorbents in petrochemical, environmental protection and other fields due to their unique structures and properties. The supported zeolite has bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/10B01J35/04B01J29/40B01J29/035B01J29/89B01J27/224B01J37/02
Inventor 张劲松矫义来杨振明田冲
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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