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Preparation method of a rare earth-based composite multi-component denitrification and dedioxin catalyst

A dioxin removal, multi-component technology, applied in separation methods, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of high cost, complex mercury removal technology, harmful by-products, etc.

Active Publication Date: 2016-07-06
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

[0012] But for flue gas mercury removal, gaseous elemental Hg 0 The removal of mercury pollution in flue gas is always a difficult point
[0013] Existing mercury removal technologies such as activated carbon adsorption, chemical precipitation and many other technologies can achieve the purpose of mercury removal, but the mercury removal technology is relatively complicated, the cost is relatively high, and even other harmful by-products will be produced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] A preparation method of a rare earth-based composite multi-component denitration and dedioxin catalyst, which uses titanium dioxide (titanium dioxide) and silicon powder as carriers, and uses ammonium metatungstate, ammonium metavanadate, cerium nitrate and lanthanum nitrate as active groups It is made by mixing, kneading, molding, drying and roasting with auxiliary materials; wherein the auxiliary materials include monoethanolamine, citric acid, ammonia water, lactic acid, stearic acid, glass fiber, high molecular polymer fiber RP-CHOP , hydroxypropyl methylcellulose, polyethylene oxide and water.

[0078] Specific plans include:

[0079] (1) Preparation of active components: add 40 liters of water to the active dissolving tank, add 10 ㎏ of monoethanolamine to the dissolving tank, when the temperature reaches 85 ℃, add 10 ㎏ of ammonium metavanadate and 35 ㎏ of metatungsten to the dissolving tank. Ammonium acid is added into the dissolving tank and stirred evenly until...

Embodiment 2

[0095] (1) Preparation of active components: add 60 liters of water to the dissolving tank, add 15 ㎏ of monoethanolamine to the dissolving tank, and when the temperature reaches 95 ℃, add 115 ㎏ of ammonium metavanadate and 45 ㎏ of metatungstic acid to the dissolving tank. Ammonium was added to the dissolving tank, and stirred uniformly for 50 minutes until all dissolved to obtain ammonium metavanadate and ammonium metatungstate active solutions;

[0096] In addition, add 50 liters of water to the dissolving tank, then add 25 kg of citric acid to the dissolving tank and stir for 6 minutes, add 12 kg of cerium nitrate to the dissolving tank to be completely dissolved, and then add 12 kg of lanthanum nitrate to dissolve In the tank, the active solutions of cerium nitrate and lanthanum nitrate are prepared after being completely dissolved;

[0097] (2) Preparation of carrier dipping solution: add 450 liters of water into the dipping tank, and then add the prepared active solutions o...

Embodiment 3

[0114] A method for preparing a rare earth-based composite multi-component denitration and dedioxin catalyst, which uses titanium dioxide (titanium dioxide) and silicon powder as carriers and applies advanced preparation technology to prepare ammonium metatungstate, ammonium metavanadate, cerium nitrate and nitric acid. Lanthanum as the active component is prepared into a solution according to a certain ratio, and the active material is loaded onto the titanium dioxide carrier by dipping method, and then auxiliary materials such as lubricants, binders, plasticizers, and molding agents are added, and the whole is extruded. Using the synergistic coupling effect between rare earth elements and active substances, the material structure is optimized, the adsorption equilibrium relationship of catalytic materials to different gases is improved, and simultaneous denitration and dioxin removal are realized. Auxiliary materials include: monoethanolamine, citric acid, ammonia water, lact...

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Abstract

The invention discloses a preparation method of a rare-earth-based composite multi-component denitrification and dioxin removal catalyst. According to the preparation method, titanium dioxide (titanium white) and silicon powder as carriers and ammonium metatungstate, ammonium metavanadate, cerous nitrate and lanthanum nitrate as active components, the steps of mixing, kneading, molding, drying and roasting are carried out in the presence of auxiliary materials to prepare the catalyst, wherein the auxiliary materials include monoethanolamine, citric acid, ammonium hydroxide, lactic acid, stearic acid, glass fibers, macromolecular polymer fibers RP-CHOP, hydroxypropyl methyl cellulose, polyoxyethylene and water. The prepared catalyst can simultaneously decompose nitric oxides and dioxin and can improve the mercury removal efficiency of the existing smoke control device. The prepared catalyst is not only applicable to new power plants, but also suitable for the modification of a wet-method desulphurization device of an old power plant, 80 to 95 percent of HgO generated in a coal burning power plant can be oxidized to Hg<2+> by utilizing the prepared catalyst, and a majority of particle-state Hg<2+> can be removed by utilizing a dust removal device.

Description

technical field [0001] The invention relates to a honeycomb ceramic catalyst in the technical field of environmental protection, in particular to a preparation method of a rare earth-based composite multi-component denitration and dedioxin catalyst. The products prepared by the method are especially suitable for thermal power plants and glass factories. , chemical plants and other fields of dust purification. Background technique [0002] Nitrogen oxides and mercury are one of the main components that cause air pollution and heavy metal pollution. They are not only harmful to the human body, but also pollute the environment. [0003] According to the requirements of the "Nitrogen Oxide Emission Standard for Thermal Power Plants" (the second draft), SCR denitration catalyst must be installed to meet the emission requirements of 100mg / Nm3 for new units or old units in key areas, and 200mg / Nm3 for non-key areas emission requirements. At present, the most mature denitration te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01D53/86B01D53/56B01D53/70B01D53/64
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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