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Monolayer, b-axis oriented zsm-5 zeolite coating material on porous silicon carbide surface and its preparation

A technology of ZSM-5 and porous silicon carbide, which is applied to the growth of polycrystalline materials, catalyst activation/preparation, and hydrocarbon production from oxygen-containing organic compounds. Effects of carbon phenomenon, prolonging catalyst life, and improving selectivity

Active 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

[0006] The purpose of the present invention is to provide a single layer of porous silicon carbide carrier surface, b-axis orientation zeolite coating material and its preparation method, to solve the problem of ZSM in the prior art -Type 5 zeolite crystal layer is thin, the loading capacity of zeolite crystals growing on the surface of foamed silicon carbide carrier is low, and the conversion rate of methanol is low, etc.

Method used

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  • Monolayer, b-axis oriented zsm-5 zeolite coating material on porous silicon carbide surface and its preparation
  • Monolayer, b-axis oriented zsm-5 zeolite coating material on porous silicon carbide surface and its preparation
  • Monolayer, b-axis oriented zsm-5 zeolite coating material on porous silicon carbide surface and its preparation

Examples

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Embodiment 1

[0037] Foamed silicon carbide carrier (in this embodiment, the rib surface of the foamed silicon carbide carrier is a porous layer formed by overlapping silicon carbide particles, the pore diameter of the porous layer is 10-20 microns, the thickness of the porous layer is 30-50 microns, and the silicon carbide The porosity of surface porous layer is 30%, see Fig. 1) the preparation method of surface monolayer, b-axis orientation ZSM-5 type zeolite molecular sieve coating material:

[0038] First, a zeolite seed colloid was grown in situ. 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 3.5 hours. After the zeolite seed crystal colloid was grown in situ, the excess sol was shaken off with a centrifuge, and dried at room tem...

Embodiment 2

[0040] Foamed silicon carbide carrier (in this embodiment, the rib surface of the foamed silicon carbide carrier is a porous layer formed by overlapping silicon carbide particles, the pore diameter of the porous layer is 30-40 microns, the thickness of the porous layer is 80-100 microns, and the silicon carbide The porosity of the surface porous layer is 60%) The preparation method of surface monolayer, b-axis orientation ZSM-5 type zeolite molecular sieve coating material:

[0041] The method for growing zeolite seed crystal colloid in situ is the same as that in Example 1. To prepare a secondary growth solution, mix ethyl orthosilicate, tetrapropylammonium hydroxide, sodium metaaluminate, and deionized water in a molar ratio of 1:0.17:0.065:200. The weight ratio of foamed silicon carbide ceramics to the reaction solution is 1:25, and the foamed silicon carbide ceramics is fixed at 1 cm away from the bottom of the reactor with a polytetrafluoroethylene support frame; the volu...

Embodiment 3

[0043] Honeycomb silicon carbide carrier (in this embodiment, the surface of the hole wall of the honeycomb silicon carbide carrier is a porous layer formed by overlapping silicon carbide particles, the pore diameter of the porous layer is 5 to 10 microns, and the thickness of the porous layer is 20 to 30 microns. The porosity of silicon surface porous layer is 60%) The preparation method of surface monolayer, b-axis orientation ZSM-5 type zeolite molecular sieve coating material:

[0044] The method for growing zeolite seed crystal colloid in situ is the same as that in Example 1. To prepare a secondary growth solution, mix ethyl orthosilicate, tetrapropylammonium hydroxide, sodium metaaluminate, and deionized water in a molar ratio of 1:0.17:0.065:200. The weight ratio of the honeycomb silicon carbide ceramics 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 fra...

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Abstract

The invention belongs to the technical field of a structured catalyst and an application thereof, in particular to a porous carborundum surface single-layered and b-axis oriented ZSM-5 zeolite coating material and a preparation method thereof. Foamy carborundum or honeycomb structured carborundum is taken as a carrier, wherein a porous layer which is composed of overlapped carborundum grains is formed on the outer surface of the carrier; a zeolite coating layer is uniformly formed in the zeolite coating; the zeolite coating layer has a single-layer structure; and a b axis of a zeolite crystalis vertical to the surface of the carborundum carrier. The preparation method comprises the following steps: growing a layer of seed crystal colloid in situ on a carborundum ceramic surface in advance; controlling the basicity of a secondary growing solution, the concentration of nutrient substances and an added quantity of alkali metallic ions; and realizing the controllable growth of zeolite crystal on the surface of the carborundum carrier. The channel of the structured catalyst is opened; the molecular diffusion property is excellent; a specific surface area and a load are bigger; a contact area between the zeolite crystal and the carborundum carrier is big; the strengthened mass transfer and heat transfer are boosted; and the contact time among the reactant, the reaction product and the catalyst is shortened.

Description

technical field [0001] The invention belongs to the technical field of structural catalysts and their applications, and in particular relates to a single-layer, b-axis-oriented ZSM-5 zeolite coating material 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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IPC IPC(8): B01J29/40B01J35/10B01J35/04B01J37/02C04B41/85C30B7/10C30B29/34C07C1/20C07C11/00
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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