Zeolite coating material with high intercrystalline porosity on the surface of porous silicon carbide support and its preparation

A porous silicon carbide and silicon carbide carrier technology, which is applied in catalyst activation/preparation, inorganic chemistry, molecular sieve catalysts, etc., can solve the problems of unsatisfactory supported zeolite coating, achieve good molecular diffusion performance, improve mass transfer, and load capacity. big effect

Inactive Publication Date: 2011-12-14
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a zeolite coating material with high intercrystalline porosity on the surface of a porous silicon carbide carrier and its preparation method, so as to solve the problems of unsatisfactory loaded zeolite coating in the prior art.

Method used

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  • Zeolite coating material with high intercrystalline porosity on the surface of porous silicon carbide support and its preparation
  • Zeolite coating material with high intercrystalline porosity on the surface of porous silicon carbide support and its preparation
  • Zeolite coating material with high intercrystalline porosity on the surface of porous silicon carbide support and its preparation

Examples

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Comparison scheme
Effect test

Embodiment 1

[0035] In this example, the preparation method of the high intercrystalline porosity zeolite coating material on the surface of the foamed silicon carbide carrier:

[0036] First, the surface of the foamed silicon carbide support was modified using a colloidal zeolite seed-directing agent. Mix ethyl orthosilicate, tetrapropylammonium hydroxide, and deionized water in a molar ratio of 1:0.32:29. After the tetraethyl orthosilicate was completely hydrolyzed, the foamed silicon carbide carrier and the above solution were placed in a reaction kettle, and hydrothermally synthesized at 130° C. for 4 hours. A secondary growth solution was prepared, and ethyl orthosilicate, tetrapropylammonium hydroxide, aluminum nitrate, sodium chloride, and deionized water were mixed in a molar ratio of 1:0.15:0.013:0.22:150. The weight ratio of the foamed silicon carbide carrier to the reaction solution is 1:30, and the foamed silicon carbide carrier is fixed at 1 cm away from the bottom of the rea...

Embodiment 2

[0038] In this example, the preparation method of the high intercrystalline porosity zeolite coating material on the surface of the foamed silicon carbide carrier:

[0039] The method for modifying the surface of the foamed silicon carbide carrier with the colloidal zeolite seed crystal directing agent is the same as in Example 1. To prepare a secondary growth solution, mix ethyl orthosilicate, tetrapropylammonium hydroxide, and deionized water in a molar ratio of 1:0.15:150. The weight ratio of the foamed silicon carbide carrier to the reaction solution is 1:30, and the foamed silicon carbide carrier is fixed at 1 cm away from the bottom of the reactor with a polytetrafluoroethylene support frame; the volume of the solution is 55 milliliters, and the volume of the reactor is 100 milliliters. The temperature used for the hydrothermal reaction is 170° C., the time is 48 hours, and the pressure is the autogenous pressure generated by the vaporization of the solution. After the ...

Embodiment 3

[0041] In this example, the preparation method of the high intercrystalline porosity zeolite coating material on the surface of the honeycomb silicon carbide carrier:

[0042] The method for modifying the surface of the honeycomb silicon carbide carrier with the colloidal zeolite seed crystal directing agent is the same as in Example 1. A secondary growth solution was prepared, and ethyl orthosilicate, tetrapropylammonium hydroxide, aluminum nitrate, sodium chloride, and deionized water were mixed in a molar ratio of 1:0.15:0.0065:0.15:190. The weight ratio of the honeycomb silicon carbide carrier to the reaction solution is 1:25, and the honeycomb silicon carbide ceramics is fixed at 1 cm from the bottom of the reactor with a polytetrafluoroethylene support frame; the volume of the solution is 55 milliliters, and the volume of the reactor is 100 milliliters. The temperature used for the hydrothermal reaction is 170° C., the time is 48 hours, and the pressure is the autogenous...

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Abstract

The invention which belongs to the technical field of structured catalysts and application technologies thereof concretely relates to a high intercrystal poriness zeolite coating material on the surface of a porous silicon carbide carrier and a preparation method thereof. The porous silicon carbide carrier involved by the material has a macroscopic porous structure, for example a foamy structure,and a honeycomb structure. The zeolite coating has a high intercrystal poriness. According to the preparation method, the surface of the porous silicon carbide carrier is modified by a colloidal zeolite guiding agent to realize the preferred growth of zeolite crystal on the surface of the porous silicon carbide carrier; and the alkalinity of a secondary growth solution, the concentration of nutrients, and the addition of alkali metal ions are controlled to control the intercrystal poriness of zeolite. The coating material has the advantages of high intercrystal poriness, small zeolite crystaldimension, good molecular diffusion ability, large zeolite load capacity, adjustable silica-alumina ratio of the zeolite crystal and zeolite coating thickness, and good binding ability of the zeolitecrystal with the surface of the porous silicon carbide carrier. The structured catalyst which is in favor of mass and heat transfer reinforcement has wide application prospects in fields of catalysis, adsorption, separation and the like.

Description

technical field [0001] The invention belongs to the technical field of structural catalysts and their applications, and in particular relates to a zeolite coating material with high intercrystalline porosity on the surface of a porous silicon carbide carrier and a preparation method thereof. Background technique [0002] Zeolite crystals have unique structures and properties, and have been widely used as catalysts, catalyst supports or adsorbents in petrochemical, environmental protection and other fields. Traditional zeolite crystal catalysts are applied in the fixed bed in the form of particles, which not only leads to a waste of energy due to the increase of bed pressure drop, but also produces a large concentration and temperature gradient in the production process, which reduces the catalytic performance of the catalyst. efficiency. At the same time, the separation and recovery of zeolite crystal catalysts are difficult, resulting in catalyst loss and environmental pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J29/035B01J37/10B01J35/10B01J20/18B01J20/28
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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