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A kind of preparation method of high specific surface area porous honeycomb ceramic catalyst

A high specific surface area, honeycomb ceramic technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of high concentration of nitrogen oxides, low dust content, large footprint, etc., to achieve nitrogen The effects of high oxide concentration, less smoke volume, and increased compressive strength

Active Publication Date: 2016-04-13
山东信义汽车配件制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in some industries, such as glass factories, stainless steel pickling lines, steel plant sintering furnaces and other boilers or units with high concentration of nitrogen oxides, low dust content, and frequent start / stop, the denitrification catalyst with 15-20 holes is obviously not suitable. Easy to burst and occupy a large area

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) First prepare the active components, including adding 40kg of water into the dissolving tank, adding 8kg of monoethanolamine into the dissolving tank, and when the temperature is controlled at 85°C, mix 8 ammonium metavanadate and 20 metatungstate Add ammonium into the dissolving tank, stir evenly, add 10kg of citric acid into the dissolving tank and stir, add 5kg of cerium nitrate and 5kg of palladium acetate into the dissolving tank until all are dissolved to obtain the active component solution ;

[0048] (2) Mixing process:

[0049] One-time mixing: first add 310kg of titanium dioxide, 40kg of montmorillonite and 25kg of α-alumina into the mixer and dry mix them evenly, then add 2kg of stearic acid, 6kg of lactic acid, 210 liters of water and Add 40 liters of ammonia water into the mixer and mix evenly;

[0050] Secondary mixing: Add 90kg of titanium dioxide and 15 liters of water into the mixer and mix evenly;

[0051] Three times of mixing: Add 120kg of tit...

Embodiment 2

[0061] (1) First prepare the active ingredient, including adding 60kg of water into the dissolution tank, adding 12kg of monoethanolamine into the dissolution tank, and when the temperature is controlled at 95°C, add 12kg of ammonium metavanadate and 30kg of metavanadate Add ammonium tungstate into the dissolving tank, stir evenly, add 15kg of citric acid into the dissolving tank and stir, add 7kg of cerium nitrate and 7kg of palladium acetate into the dissolving tank until all are dissolved to obtain the active group Divide the solution;

[0062] (2) Mixing process:

[0063] One-time mixing: first add 340kg of titanium dioxide, 60kg of montmorillonite and 35kg of α-alumina to the mixer and dry mix them evenly, then add 3kg of stearic acid, 7kg of lactic acid, 250 liters of water and Add 50 liters of ammonia water into the mixer and mix evenly;

[0064] Secondary mixing: Add 120kg of titanium dioxide and 25 liters of water into the mixer and mix evenly;

[0065] Three times...

Embodiment 3

[0076] A method for preparing a porous honeycomb ceramic catalyst with a high specific surface area. Titanium dioxide, montmorillonite, and α-alumina are used as carriers, mixed with active components, and then mixed, kneaded, aged, formed, dried, and roasted.

[0077] The carrier is composed of titanium dioxide, montmorillonite, and α-alumina;

[0078] The active components are: ammonium metatungstate, ammonium metavanadate, cerium nitrate, palladium acetate;

[0079] Other excipients include: monoethanolamine, ammonia water, lactic acid, stearic acid, glass fiber, polymer fiber (RP-CHOP), hydroxypropyl methylcellulose, polyethylene oxide, citric acid and water;

[0080] Raw material preparation:

[0081] ①. Weigh 564.5kg of titanium dioxide (divided into three parts: 324.5kg, 105kg, and 135kg), 50kg of montmorillonite powder and 30kg of α-alumina;

[0082] ②. Preparation of active components:

[0083] a. Weigh 25kg of ammonium metatungstate, 6kg of cerium nitrate, 6kg of ...

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Abstract

The invention discloses a preparation method of a porous honeycomb ceramic catalyst with a high specific surface area. The porous honeycomb ceramic catalyst is prepared by taking titanium dioxide, montmorillonite and alpha aluminum oxide as carriers and ammonium metatungstate, ammonium metavanadate, cerium nitrate and palladium acetate as active components through mixing, aging, kneading, molding, drying and roasting under the accompanying of auxiliary materials, wherein the auxiliary materials comprise monoethanolamine, ammonia water, lactic acid, stearic acid, glass fibers, macromolecular polymer fibers, hydroxypropyl methyl cellulose, polyoxyethylene, citric acid and water. According to the preparation method of the porous honeycomb ceramic catalyst with the high specific surface area, the catalyst carriers are optimized in order to be adapted to application conditions of frequent temperature variation, high concentration of nitrogen oxides, high heat stability and high specific surface; the montmorillonite and the alpha aluminum oxide are used for replacing one part of the titanium dioxide, the montmorillonite has the enhancing effect and the aluminum oxide has the effect of high heat stability; and meanwhile, the macromolecular polymer fibers are used for replacing wood pulp so that a grinding tool is difficult to block in a production process and the production efficiency is improved.

Description

technical field [0001] The invention relates to a honeycomb ceramic catalyst in the technical field of environmental protection, in particular to a method for preparing a porous honeycomb ceramic catalyst with a high specific surface area. The product prepared by the method is especially suitable for smoke and dust in thermal power plants, glass factories, chemical plants and other fields purify. Background technique [0002] For flue gas denitrification, the most mature technology in the world is SCR denitrification technology. SCR denitrification technology refers to that under the action of the denitrification catalyst, the NOx in the flue gas and the reducing agent (NH 3 ) undergoes a reduction reaction to generate N 2 and H 2 O. The denitrification catalyst is the core of SCR technology, which determines the denitrification efficiency of SCR technology. [0003] At present, the domestic denitrification transformation is mainly aimed at thermal power plants. Accordi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/652B01D53/90B01D53/56
Inventor 延晓峰杜德亮王庆庆
Owner 山东信义汽车配件制造有限公司
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