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Mixed-crystal MnO2/rod-like clay low-temperature denitration catalyst and preparation method thereof

A rod-shaped clay and low-temperature denitrification technology, which is applied in the field of denitrification catalysis, can solve the problems of crystal structure transformation and low strength, and achieve the effects of low activation temperature, high strength and saving production costs

Active Publication Date: 2015-05-13
连云港石化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a mixed crystal MnO in view of the shortcomings of low catalyst support strength and high-temperature calcination that lead to crystal structure transformation in the prior art. 2 / Rod-shaped clay low-temperature denitrification catalyst and preparation method, using rod-shaped clay as the carrier to load the active component as α-MnO 2 and γ-MnO 2 Mixed crystal catalyst and preparation method thereof

Method used

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  • Mixed-crystal MnO2/rod-like clay low-temperature denitration catalyst and preparation method thereof
  • Mixed-crystal MnO2/rod-like clay low-temperature denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Put attapulgite clay in deionized water to make 4g / 100mL attapulgite clay slurry; measure 100mL attapulgite clay slurry, and put 200mL of attapulgite clay slurry into the slurry with a mass concentration of 0.75g / 100mL MnSO 4 ·H 2 O solution to obtain a mixed slurry; at room temperature, add 7.25mL KMnO with a mass concentration of 2g / 100mL 4 The solution is mixed in the slurry and stirred for 5 hours to prepare α-MnO 2 / A dispersion of attapulgite clay.

[0018] 2. At room temperature, add 6.55mL of (NH) with a mass concentration of 40g / 100mL to the dispersion obtained in step 1. 4 ) 2 S 2 O 8 The solution was reacted at 75°C for 1.5 hours. After the reaction is complete, the product is filtered, washed, dried, and pulverized to obtain mixed crystal MnO 2 / Attapulgite clay low-temperature denitration catalyst; MnO in the resulting catalyst 2 The content is 10wt%, α-MnO 2 And γ-MnO 2 The mass ratio is 1:1.

[0019] figure 1 Is (a).α-MnO 2 ;(B).γ-MnO 2 ; (C). Mixed crystal...

Embodiment 2

[0022] 1. Put halloysite in deionized water to make 5g / 100mL halloysite slurry; measure 80mL halloysite slurry, and put 100mL MnSO with a mass concentration of 1.5g / 100mL into the slurry 4 ·H 2 O solution to obtain a mixed slurry; at room temperature, add 14.5mL KMnO with a mass concentration of 1g / 100mL 4 The solution is in the mixed slurry and stirred for 6 hours to prepare α-MnO 2 / Dispersion of halloysite.

[0023] 2. At room temperature, add 6.55mL of (NH) with a mass concentration of 40g / 100mL to the dispersion obtained in step 1. 4 ) 2 S 2 O 8 The solution was reacted at 80°C for 2 hours. After the reaction is complete, the product is filtered, washed, dried, and pulverized to obtain mixed crystal MnO 2 / Halloysite low-temperature denitration catalyst; MnO in the resulting catalyst 2 The content is 10wt%, α-MnO 2 And γ-MnO 2 The mass ratio is 1:1.

Embodiment 3

[0025] 1. Put sepiolite clay in deionized water to make 3g / 100mL sepiolite clay slurry; measure 133mL sepiolite clay slurry, and put 100mL into the slurry with a mass concentration of 1.5g / 100mL Mn(NO 3 ) 2 Solution to obtain a mixed slurry; at room temperature, add 4.83mL KMnO with a mass concentration of 3g / 100mL 4 The solution is mixed in the slurry and stirred for 5 hours to prepare α-MnO 2 / A dispersion of sepiolite clay.

[0026] 2. At room temperature, add 8.73mL of (NH) with a mass concentration of 30g / 100mL to the dispersion obtained in step 1. 4 ) 2 S 2 O 8 The solution was reacted at 70°C for 3 hours. After the reaction is complete, the product is filtered, washed, dried, and pulverized to obtain mixed crystal MnO 2 / Sepiolite clay low-temperature denitration catalyst; MnO in the obtained catalyst 2 The content is 10wt%, α-MnO 2 And γ-MnO 2 The mass ratio is 1:1.

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Abstract

The invention belongs to the field of denitration catalysis and particularly relates to a mixed-crystal MnO2 / rod-like clay low-temperature denitration catalyst. Aimed at deficiencies of low catalyst support strength and crystal structure transformation caused by high-temperature calcination in the prior art, the invention provides the mixed-crystal MnO2 / rod-like clay low-temperature denitration catalyst and a preparation method thereof, particularly a mixed-crystal catalyst taking rod-like clay as a carrier and loaded with active components-alpha-MnO2 and gamma-MnO2 as well as a preparation method for the catalyst. The catalyst prepared by adopting the method is high in strength, low in catalyst activity temperature, wide in activity temperature range and high in denitration efficiency. In addition, the rod-like clay adopted in the catalyst is rich in reserve and low in price in China, so that the production cost of the catalyst is reduced.

Description

Technical field [0001] The invention belongs to the field of denitrification catalysis, in particular to a mixed crystal type MnO 2 / Rod clay denitration catalyst. Background technique [0002] Nitrogen oxides (NO x ) Is a kind of air pollutant with great harm, which can cause a series of environmental problems such as acid rain, photochemical smog and ozone layer destruction. Ammonia selective catalytic reduction (SCR) is currently the most effective flue gas denitrification technology, and the catalyst is the key to this technology. However, the currently used V-W-Ti series of commercial catalysts require a relatively high reaction temperature, which is generally required to be controlled at 573~673K. Therefore, it is necessary to develop low-temperature SCR catalysts and processes. Chinese patent CN 103381362A discloses a kind of nano-TiO 2 As the carrier, the preparation method of the low-temperature catalyst supporting the manganese-cerium active component doped with tran...

Claims

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Application Information

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IPC IPC(8): B01J23/34
Inventor 罗士平周文挺吴凤芹姚超左士祥刘文杰李霞章
Owner 连云港石化有限公司
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