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Faviform ammonia-method selective-catalytic-reduction denitrified catalyst and preparation method thereof

A denitrification catalyst and selective technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of high vanadium loading and poor wear resistance problem, to achieve the effect of high strength, excellent formability and long-lasting activity

Inactive Publication Date: 2010-03-24
晶锐瓷业(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the surface coating, the loading of vanadium is high and the corrosion resistance is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] TiO 2 The powder is stirred with warm water at 60°C in a water bath at a temperature of 80°C to obtain a carrier slurry; during the stirring process, ammonium metavanadate and ammonium paratungstate are slowly added to the stirred carrier slurry, and the mixture of ammonium metavanadate and ammonium paratungstate The added amount is converted into V 2 o 5 and WO3 later with TiO 2 The ratio is 1:4:45, then add various additives clay, methylcellulose, polyethylene oxide, silica sol, glass fiber, monoethanolamine, continue to stir until the water content is suitable, then transfer to the vacuum mud mixer Intermediate mixing, the refining time is half an hour, the refined mud is stale while keeping the humidity constant, the stale time is 8 hours, and then continue to mix, so repeated several times; the final refined mud The material is extruded into a honeycomb body through an extruder, and then dried in a drying oven with controllable humidity and drying speed at a dry...

Embodiment 2

[0029] TiO 2 The powder is stirred with warm water at 60°C in a water bath at a temperature of 70°C to obtain a carrier slurry; during the stirring process, ammonium metavanadate and ammonium paratungstate are slowly added to the stirred carrier slurry, and the mixture of ammonium metavanadate and ammonium paratungstate The added amount is converted into V 2 o 5 and WO3 later with TiO 2 The ratio is 1:8:91, then add various additives clay, methylcellulose, polyethylene oxide, silica sol, glass fiber, monoethanolamine, continue to stir until the water content is suitable, then transfer to the vacuum mud mixer Intermediate mixing, the refining time is half an hour, the refined mud is stale while keeping the humidity constant, the stale time is 8 hours, and then continue to mix, so repeated several times; the final refined mud The material is extruded into a honeycomb body through an extruder, and then dried in a drying oven with controllable humidity and drying speed at a dry...

Embodiment 3

[0032] TiO 2The powder is stirred with warm water at 60°C in a water bath at a temperature of 70°C to obtain a carrier slurry; weigh the corresponding mass of ammonium paratungstate and ammonium metavanadate powder, and slowly add it to the oxalic acid solution with a concentration of 5% in a water bath at 60°C , after being dissolved, then added to the above-mentioned slurry and continued to stir evenly, the addition of ammonium metavanadate and ammonium paratungstate is equivalent to V 2 o 5 and WO3 later with TiO 2 The ratio is 1.6:8:80, then add various additives clay, methylcellulose, polyethylene oxide, silica sol, glass fiber, monoethanolamine, continue to stir until the water content is suitable, then transfer to the vacuum mud mixer Intermediate mixing, the refining time is half an hour, the refined mud is stale while keeping the humidity constant, the stale time is 8 hours, and then continue to mix, so repeated several times; the final refined mud The material is ...

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Abstract

The invention relates to a faviform ammonia-method selective-catalytic-reduction denitrified catalyst and a preparation method thereof. The invention is characterized in that the catalyst uses TiO2 with a special specific surface area as the carrier and uses V2O5 and WO3 as the catalyst and the cocatalyst, various assistants favorable for the catalyst to form, disperse and perforate are simultaneously added, and the faviform denitrified catalyst is obtained in short drying time and calcination time. The catalyst comprises the following components in weight percent: 80-99% of TiO2, 0.1-2% of V2O5 and 5-10% of WO3. The method selects the TiO2 with the special specific surface area as the carrier, simultaneously adds the proper forming assistants and combines the special preparation techniqueso as to obtain the faviform denitrified catalyst with high strength and favorable forming performance and enhance the denitration activity of the catalyst; when the trial denitration test is carriedout on the faviform denitrified catalyst in a small-size coal burning boiler, the airspeed is 5000 / hr, and the concentration of NOX is about 100 ppmv; when the fume temperature is 350 DEG C, the denitration efficiency reaches 95%; and after long-term operation, the denitration efficiency is still above 80%.

Description

technical field [0001] The invention relates to a honeycomb selective catalytic reduction denitrification catalyst for ammonia method and a preparation method thereof Background technique [0002] Nitrogen oxides (NOx) are one of the main pollutants in the atmospheric environment and one of the main sources of acid rain, which will cause serious damage to the environment. Damage the central nervous system and lung tissue, NOx in the atmosphere will also generate more toxic photochemical smog under certain conditions, causing the death of plants and people. Nitrogen oxides mainly come from vehicle exhaust, fuel combustion in thermal power stations and other industries, and industrial production processes of nitric acid, nitrogen fertilizers, and explosives. The amount produced during fuel combustion is the largest, accounting for more than 30%, of which 70% comes from direct combustion of coal. The Selective Catalytic Reduction (SCR) method using NH3 as the reducing agent i...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J23/22B01J21/06B01D53/56
Inventor 马少丹赵晓林孙海军何冬青
Owner 晶锐瓷业(北京)有限公司
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