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Preparation method of catalytic ceramic filter tube based on 3D printing technology

A 3D printing and ceramic technology, which is applied in the direction of catalyst activation/preparation, ceramic products, chemical instruments and methods, etc., can solve the problem that the uniformity and thickness controllability of the catalyst need to be improved, which affects the permeability of the catalytic ceramic filter tube and the poor uniformity of the catalyst. and other problems, to achieve excellent fluidity, promote diffusion speed, and promote the effect of wrapping

Active Publication Date: 2022-06-03
安徽紫朔环境工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, although these traditional processes such as soaking and coating are simple and feasible, the uniformity and thickness controllability of the catalyst in the catalytic ceramic filter tube need to be improved
Publication No. CN110038368A discloses "a ceramic fiber filter tube, preparation method and pressurized suction molding device". The ceramic fiber filter tube with catalytic function prepared by this method adopts the method of soaking the blank tube, although the preparation process It is relatively simple, but the method of directly soaking the billet tube in the catalyst sol makes the catalyst uniformity in the ceramic filter tube poor, and the denitrification efficiency is not high
The patent with the publication number CN105107310A discloses "a catalytic ceramic filter tube and its preparation method". It is relatively simple and feasible, but the coating thickness can only be controlled at the millimeter level, which affects the air permeability of the catalytic ceramic filter tube, thereby affecting the denitrification efficiency

Method used

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  • Preparation method of catalytic ceramic filter tube based on 3D printing technology
  • Preparation method of catalytic ceramic filter tube based on 3D printing technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]Preparation of Heptagonal POSS sodium salt: put 0.01mol phenyltrimethylsilane, 120mL tetrahydrofuran, 3mL deionized water and 0.036mol sodium hydroxide in a single-necked flask with magnetic stirring, stir and heat up to reflux, keep Reflux reaction, when a small amount of white solid precipitates out of the reaction system, drop to room temperature and continue to stir the reaction for 24h, spin dry the solvent, and vacuum dry to obtain heptagonal POSS sodium salt.

Embodiment 2

[0029] Preparation of bromopropyl-POSS:

[0030] Add 0.1 mol of Heptagonal POSS sodium salt prepared in Example 1 into a three-necked flask, under nitrogen protection, add 120 mL of anhydrous tetrahydrofuran, stir evenly, add 0.21 mol of triethylamine, react in an ice bath at 0°C for 1 h, and use a constant pressure funnel Slowly add 60mL of tetrahydrofuran solution containing 0.23mol 3-bromopropyltrichlorosilane dropwise, the rate of addition is 2 drops / sec, react for 6h, then rise to room temperature for 12h, filter after the reaction, spin dry the filtrate and separate it through a column ( The volume ratio of dichloromethane:petroleum ether is 1:2), and vacuum-dried to constant weight to obtain bromopropyl-POSS.

Embodiment 3

[0032] Preparation of modified polyethylene glycol:

[0033] The first step is to dissolve 200 g of polyethylene glycol in deionized water, stir and heat up to 60 ° C until the polyethylene glycol is completely dissolved, then add 20 g of oxidant, and react in an open mouth for 2 hours to obtain carboxylated polyethylene glycol, wherein the oxidant is It is composed of 68wt% nitric acid solution and 4-hydroxy-2,2,6,6-tetramethyl-piperidine nitroxide radical (nitric acid, 4-hydroxy-2,2,6,6-tetramethyl-piperidine The molar ratio of nitroxide radicals is 1:1), and the relative molecular mass of polyethylene glycol is 2000;

[0034] In the second step, 100g of carboxylated polyethylene glycol and 20g of bromopropyl-POSS prepared in Example 2 were added to 150mL of N,N-dimethylformamide. After mixing, 0.1g of potassium fluoride and 0.14mol of potassium fluoride were added. Triethylamine, heated to 95°C, stirred and reacted for 4h, cooled to room temperature, extracted twice with a...

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Abstract

The invention relates to a preparation method of a catalytic ceramic filter tube based on a 3D printing technology, and belongs to the technical field of ceramic filter tubes, and the preparation method comprises the following steps: step A, preparation of ceramic matrix slurry; step B, preparing a ceramic matrix; step C, preparing a catalyst solution; step D, printing; and E, forming: sintering and cooling the catalytic ceramic filter tube to obtain the catalytic ceramic filter tube based on the 3D printing technology. Modified silicon carbide is introduced into a ceramic tube matrix raw material, the modified silicon carbide is used as a pore-forming agent, a ceramic tube matrix with uniform pore size distribution is obtained, and citric acid, hydroxyapatite and polyethylene glycol wrap the surface of silicon carbide, so that the uniformity of porous distribution is improved; a catalyst solution is sprayed by utilizing a 3D printing technology, the catalyst solution is uniformly distributed on the ceramic filter tube by setting scientific program spraying parameters, and the thickness of the catalyst can be controlled at a micron level.

Description

technical field [0001] The invention belongs to the technical field of flue gas treatment, and in particular relates to a preparation method of a catalytic ceramic filter tube based on a 3D printing technology. Background technique [0002] "Catalytic ceramic filter tube dust, sulfur and nitrate integration technology" is currently the most widely used and efficient nitrogen oxides and dust integrated removal technology in the glass industry. This technology can realize the integration of desulfurization, denitration and dust removal, greatly reducing the floor space. At the same time, the composite structure of the ceramic filter tube avoids the flexibility of the cloth bag, and the dust removal effect is better. The life of the ceramic filter tube can reach 5-8 years. [0003] The preparation method of the catalytic ceramic filter tube is usually to prepare a ceramic substrate, and then the ceramic substrate is subjected to processes such as soaking, coating, etc., and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/13C04B38/02C04B41/87B01D53/86B01D53/56B01J31/04B01J35/04B01J37/02
CPCC04B33/13C04B38/02C04B41/87C04B41/5041B01D53/8625B01J31/04B01J37/0217B01J37/0219C04B2235/3826C04B2235/6023B01D2258/0283B01J35/56C04B38/0074C04B38/0054C04B41/4543C04B41/4578Y02A50/20
Inventor 张思琦孙正庭陈拿云王魁
Owner 安徽紫朔环境工程技术有限公司
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