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Catalyst for removing nitrogen oxide through ammonia selective catalytic reduction and preparation method of catalyst

A technology for selective catalysis and nitrogen oxides, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve ecological environment and human health hazards, operating temperature window Narrow, low selectivity and other problems, to achieve the effect of good resistance to water vapor, high selectivity, simple preparation steps

Active Publication Date: 2015-07-08
THE NORTHWEST RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst has good resistance to water vapor and sulfur dioxide poisoning, and overcomes the currently commonly used NH 3 -SCR vanadium-based catalyst system has a narrow operating temperature window, and N 2 Low selectivity and potential hazards to the ecological environment and human health

Method used

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  • Catalyst for removing nitrogen oxide through ammonia selective catalytic reduction and preparation method of catalyst

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Experimental program
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Effect test

Embodiment 1

[0025] The catalyst for nitrogen oxide removal by ammonia selective catalytic reduction in this embodiment includes a carrier and an active component, the active component is ceria, tungsten trioxide and zirconium dioxide, and the carrier is anatase Type TiO 2 The molar ratio of the ceria, tungsten trioxide and zirconium dioxide is 1:1:1, and the mass ratio of the active component to the support is 1:19.

[0026] The preparation method of the catalyst of the present embodiment is:

[0027] Step 1, 4.34g cerous nitrate (Ce(NO 3 ) 3 ·6H 2 O), 2.64g of ammonium metatungstate (the content of tungsten trioxide is not less than 88wt%, calculated as 88wt%) and 4.29g of zirconium nitrate pentahydrate are dissolved in water, and stirred evenly to obtain a mixed solution;

[0028] Step 2, 100g industrial grade anatase TiO 2 The powder is immersed in the mixed solution described in step 1, and then 6g of urea is added to the mixed solution under stirring conditions, and the mixed so...

Embodiment 2

[0031] The catalyst for nitrogen oxide removal by ammonia selective catalytic reduction in this embodiment includes a carrier and an active component, the active component is ceria, tungsten trioxide and zirconium dioxide, and the carrier is anatase Type TiO 2 , the molar ratio of ceria, tungsten trioxide and zirconium dioxide is 2:1:1, and the mass ratio of the active component to the carrier is 1:14.3.

[0032] The preparation method of the catalyst of the present embodiment is:

[0033] Step 1, 8.68g cerous nitrate (Ce(NO 3 ) 3 ·6H 2 O), 2.64g of ammonium metatungstate (the content of tungsten trioxide is not less than 88wt%, calculated as 88wt%) and 4.29g of zirconium nitrate pentahydrate are dissolved in water, and stirred evenly to obtain a mixed solution;

[0034] Step 2, 100g industrial grade anatase TiO 2 The powder is immersed in the mixed solution described in step 1, and then 5 g of urea is added to the mixed solution under stirring conditions. After the urea is...

Embodiment 3

[0037] The catalyst for nitrogen oxide removal by ammonia selective catalytic reduction in this embodiment includes a carrier and an active component, the active component is ceria, tungsten trioxide and zirconium dioxide, and the carrier is anatase Type TiO 2 , the molar ratio of ceria, tungsten trioxide and zirconium dioxide is 2:1:2, and the mass ratio of the active component to the carrier is 1:12.2.

[0038] The preparation method of the catalyst of the present embodiment is:

[0039] Step 1, 8.68g cerous nitrate (Ce(NO 3 ) 3 ·6H 2 O), 2.64g of ammonium metatungstate (the content of tungsten trioxide is not less than 88wt%, calculated as 88wt%) and 8.58g of zirconium nitrate pentahydrate are dissolved in water, and stirred evenly to obtain a mixed solution;

[0040] Step 2, 100g industrial grade anatase TiO 2 The powder is immersed in the mixed solution described in step 1, and then 8 g of urea is added to the mixed solution under stirring conditions. After the urea ...

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Abstract

The invention discloses a catalyst for removing nitrogen oxide through ammonia selective catalytic reduction. The catalyst comprises a carrier and active components, wherein the active components comprise cerium dioxide, tungsten trioxide and zirconium dioxide, the carrier is anatase type TiO2, the molar ratio of the cerium dioxide, the tungsten trioxide and the zirconium dioxide is (1-2):(1-2):(1-2), and the mass ratio of the active components and the carrier is 1:(10-20). In addition, the invention further discloses a preparation method of the catalyst. The catalyst has good vapour resistance and sulfur dioxide poisoning resistance, has the high activity to selectively reduce the nitrogen oxide in a wide temperature range, is high in selectivity and strong in stability, catalytically reduces the nitrogen oxide to harmless nitrogen and water, and reacts continuously for 50h at the temperature of 350 DEG C without inactivation, and the conversion rate is more than 90%.

Description

technical field [0001] The invention belongs to the technical field of preparation of low-temperature denitrification catalysts, and in particular relates to a catalyst for ammonia selective catalytic reduction to remove nitrogen oxides and a preparation method thereof. Background technique [0002] Nitrogen oxides are produced when fossil fuels and air are burned at high temperatures, and more than 90% of NO comes from the combustion process of fossil fuels (such as coal, oil, natural gas, etc.). Due to excessive emissions of coal-burning smoke and vehicle exhaust, NO in the atmosphere x (NO>90%, NO 2 <10%) concentration has shown an upward trend. Under the action of sunlight, NO is easy to form chemical smog, which is harmful to the human respiratory system. NO is also one of the precursor gases to destroy the atmospheric ozone layer and form acid rain. In order to protect the environment, countries around the world, especially developed countries, x There are st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01D53/90B01D53/56
Inventor 李飞兰力强侯鑫黄伟孙权满雪
Owner THE NORTHWEST RES INST OF CHEM IND