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Scr flue gas denitrification catalyst based on mesoporous tio2 carrier and preparation method

A denitration catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of small specific surface area and low denitration activity of catalysts, and achieve The effect of increasing specific surface area, superior catalytic activity, and strong oxidation-reduction performance

Active Publication Date: 2011-12-14
北京华电光大环境股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carrier of existing catalysts generally has the problem of small specific surface area, which leads to low denitrification activity of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Mesoporous TiO 2 Preparation of carrier: measure 9.427g of P123 (EO 20 PO 70 EO 20 ) was dissolved in 150g of absolute ethanol; then 23.568g of titanium isopropoxide and 5.657g of titanium tetrachloride were added to the above solution, and stirred for 2h; then the mixture was transferred to a petri dish and placed in a common drum Dry in an air drying oven at 40°C for 24h, and then bake in a muffle furnace at 350°C (programmed temperature rise rate is 3°C / min, holding time is 3h), and the mesoporous TiO 2 carrier.

[0027] Measure cerium nitrate, ammonium metavanadate and ammonium tungstate that mass ratio is 19.38: 1: 6.77, concrete operation is:

[0028] (2) Auxiliary CeO 2 Loading: According to the equal-volume impregnation method, measure 1.26g of cerium nitrate and dissolve it in 9.955g of deionized water, and put the mesoporous TiO 2 The carrier was added to the above-mentioned cerium nitrate solution, ultrasonically treated for 1 h and left to stand fo...

Embodiment 2

[0032] (1) Mesoporous TiO 2 Preparation of carrier: measure 9.385g of P123 (EO 20 PO 70 EO 20 ) was dissolved in 150g of absolute ethanol; then 23.46g of titanium isopropoxide and 5.63g of titanium tetrachloride were added to the above solution, and stirred for 2h; then the mixture was transferred to a petri dish and placed in a common drum Dry in an air drying oven at 40°C for 24h, and then bake in a muffle furnace at 350°C (programmed temperature rise rate is 3°C / min, holding time is 3h), and the mesoporous TiO 2 carrier.

[0033] Measure cerium nitrate, ammonium metavanadate and ammonium tungstate that mass ratio is 8.63: 1: 5.64, concrete operation is:

[0034] (2) Auxiliary CeO 2 Loading: According to the equal-volume impregnation method, measure 1.01g of cerium nitrate and dissolve it in 9.91g of deionized water, and the mesoporous TiO 2 The carrier was added to the above-mentioned cerium nitrate solution, ultrasonically treated for 1 h and left to stand for 2 h; t...

Embodiment 3

[0038] (1) Mesoporous TiO 2 Preparation of carrier: measure 9.156g of P123 (EO 20 PO 70 EO 20 ) was dissolved in 150g of absolute ethanol; then 22.89g of titanium isopropoxide and 5.5g of titanium tetrachloride were added to the above solution, and stirred for 3h; then the mixture was transferred to a petri dish and placed in a common drum Dry in an air drying oven at 40°C for 24h, and then bake in a muffle furnace at 350°C (programmed temperature rise rate is 3°C / min, holding time is 3h), and the mesoporous TiO 2 carrier.

[0039] Measure cerium nitrate, ammonium metavanadate and ammonium tungstate that mass ratio is 4.69: 1: 6.15, concrete operation is:

[0040] (2) Auxiliary CeO 2 Loading: According to the equal-volume impregnation method, measure 0.76g of cerium nitrate and dissolve it in 9.67g of deionized water, and mesoporous Ti0 2 The carrier was added to the above-mentioned cerium nitrate solution, ultrasonically treated for 1 h and left to stand for 2 h; then t...

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Abstract

The invention belongs to the fields of environmental protection and environment catalysis, and specifically relates to a novel mesoporous TiO2 carrier based SCR flue gas denitration catalyst and a preparation method thereof. According to the invention, the mesoporous TiO2 carrier based SCR flue gas denitration catalyst is obtained by using mesoporous TiO2 as a carrier, WO3 and CeO2 as auxiliary agents, and V2O5 as an active component. The compound catalyst comprises, by weight, 83.5-94.5% of TiO2, 0.5-1.5% of V2O5, 4-10% of WO3 and 1-5% of CeO2. The mesoporous TiO2 is employed as the carrier to substitute traditional nano TiO2, so as to substantially increase a specific surface area of the catalyst; and the interactions among V2O5, WO3 and CeO2 increase denitration activity of the catalyst. Besides, the catalyst shows excellent catalytic activity in a temperature range from 200 to 450 DEG C with ammonia as a reduction agent.

Description

technical field [0001] The invention belongs to the field of environmental protection and environmental catalysis, in particular to a mesoporous TiO-based 2 Carrier SCR flue gas denitrification catalyst and preparation method thereof. Background technique [0002] Nitrogen oxides NOx (mainly including NO, NO2 and N2O, etc.) emitted by coal-fired power plants are one of the main causes of acid rain, photochemical smog and greenhouse effect, making the atmospheric environment more and more serious. According to statistics, about 60% of NOx in my country's air pollutants comes from coal combustion, of which coal consumption in thermal power plants accounts for 70% of the country's coal combustion. Therefore, how to effectively control NOx emissions from thermal power plants has attracted people's attention. Nitrogen oxide pollution is a global environmental problem. All countries in the world implement strict emission standards. During the 12th Five-Year Plan period in my coun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01D53/86B01D53/56
Inventor 陆强董长青苏淑华杨勇平
Owner 北京华电光大环境股份有限公司
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