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Preparation method of wide-temperature range rare earth-based composite oxide denitration catalyst

The technology of a composite oxide and a denitration catalyst is applied in the field of a honeycomb ceramic catalyst in the field of environmental protection technology, and can solve problems such as environmental pollution, catalyst failure, equipment corrosion, etc. The effect of shortening the activation time

Active Publication Date: 2015-01-28
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

[0003] When the denitrification catalyst is turned on, if the temperature of the denitrification reaction area is lower than 300°C, ammonia cannot be sprayed, otherwise sulfur trioxide and ammonia will react to form ammonium sulfate and attach to the surface of the catalyst and equipment , resulting in catalyst poisoning and equipment corrosion and blockage
If ammonia is not injected, then when the boiler is running during this period, nitrogen oxides will be discharged beyond the standard, causing environmental pollution
If the temperature exceeds 400°C, it will cause thermal sintering of the catalyst and make the catalyst permanently invalid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A preparation method of a wide-temperature rare earth-based composite oxide denitration catalyst, using titanium dioxide and montmorillonite as carriers, ammonium metatungstate, ammonium metavanadate, cerium nitrate, and manganese oxide as active components, accompanied by auxiliary materials, It is made by kneading, aging, kneading, molding, drying and roasting; wherein the auxiliary materials include monoethanolamine, citric acid, ammonia water, lactic acid, stearic acid, glass fiber, wood pulp, hydroxypropyl methylcellulose, polyester Ethylene Oxide, Citric Acid and Water.

[0059] Specific programs include:

[0060] (1) Preparation of active components: Add 45kg of water into the dissolving tank, add 8kg of monoethanolamine into the dissolving tank, when the temperature reaches 85°C, add 6kg of ammonium metavanadate into the dissolving tank and stir evenly, then Add 30kg of ammonium metatungstate and 8kg of manganese oxide into the dissolution tank and stir evenly ...

Embodiment 2

[0074] (1) Preparation of active components: Add 55kg of water into the dissolving tank, add 12kg of monoethanolamine into the dissolving tank, when the temperature reaches 95°C, add 10kg of ammonium metavanadate into the dissolving tank and stir evenly for 20 minutes , and then 40kg of ammonium metatungstate and 12kg of manganese oxide were added to the dissolution tank at intervals of 12 minutes and stirred evenly for 50 minutes until all dissolved to obtain ammonium metatungstate and ammonium metavanadate active solution;

[0075] 55 liters of water are added to the active dissolving tank, 7kg of citric acid is added to the dissolving tank and stirred evenly for 6 minutes, then 6kg of cerium nitrate is added in the dissolving tank and after being completely dissolved, the cerium nitrate active solution is obtained;

[0076] (2) Mixing process:

[0077] Primary mixing: Add 400kg of titanium dioxide and 40kg of montmorillonite into the mixer; then add 3kg of stearic acid, ...

Embodiment 3

[0090] A preparation method of a wide-temperature rare earth-based composite oxide denitration catalyst uses titanium dioxide (titanium dioxide) and montmorillonite as the carrier, and the active component W / Mu-V-Ce (tungsten / manganese-vanadium-cerium), after mixing It is made by refining, kneading, aging, shaping, drying and roasting.

[0091] Raw material preparation:

[0092] As for the carrier material, weigh 644.5kg of titanium dioxide (divided into three parts: 369.5kg, 105kg, and 135kg), and weigh 35kg of montmorillonite.

[0093] Active component raw materials: Weigh 35kg of ammonium metatungstate, 8kg of ammonium metavanadate, 5kg of cerium nitrate and 10kg of manganese oxide; weigh 9kg of monoethanolamine solution and 6kg of citric acid.

[0094] Active component preparation: Add 50kg of water into the active dissolving tank; then add 9kg of monoethanolamine into the dissolving tank, when the temperature reaches 90°C, add 8kg of ammonium metavanadate into the dissol...

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PUM

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Abstract

The invention discloses a preparation method of a wide-temperature range rare earth-based composite oxide denitration catalyst. The preparation method comprises that titanium dioxide and montmorillonite as carriers, ammonium metatungstate, ammonium metavanadate, cerium nitrate and manganese oxide as active components and accessory materials are subjected to blending, ageing decaying, kneading, molding, drying and roasting to form the wide-temperature range rare earth-based composite oxide denitration catalyst, wherein the accessory materials comprise monoethanolamine, citric acid, ammonia water, lactic acid, stearic acid, glass fibers, wood pulp, hydroxypropyl methyl cellulose, polyoxyethylene, citric acid and water. The preparation method utilizes the rare earth-based composite oxide as an active ingredient, shortens catalyst activation time, effectively controls a SO2 / SO3 conversion rate, improves a catalyst temperature adaptation capability, widens a catalyst use temperature range from 320-400 DEG C to 150-420 DEG C, has denitration efficiency more than 90%, and can carry out ammonia spraying denitration operation at a denitration area temperature of 150 DEG C when a boiler is started.

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 wide-temperature rare earth-based composite oxide denitrification catalyst, and the product prepared by the method is especially suitable for thermal power plants, glass factories, chemical plants, etc. Field smoke and dust purification. Background technique [0002] For flue gas denitrification, the most mature technology in the world is SCR denitrification technology. The denitrification catalyst is the core of the whole denitrification system. The SCR denitrification technology is to inject NOx in the flue gas and the reducing agent (NH 3 ) is fully mixed, and in the temperature range of 320-400 ° C, under the action of a denitrification catalyst, a reduction reaction occurs to generate N 2 and H 2 O. [0003] When the denitrification catalyst is turned on, if the temperature of the denitrificatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/25B01D53/90B01D53/56
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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