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Low-temperature SCR denitration catalyst and preparation method and application thereof

A denitration catalyst and low-temperature technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as affecting catalytic activity, sintering and agglomerating metal particles, destroying the original appearance and pore structure of metal catalysts, and achieving good The effect of low temperature catalytic activity, good dispersibility and simple preparation method

Active Publication Date: 2020-01-24
SHANGHAI INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The traditional methods of preparing manganese oxide catalysts are co-precipitation method and hydrothermal method, etc. These methods need to be calcined at a high temperature in the later stage, which may destroy the original appearance and pore structure of the metal catalyst, and cause the sintering and agglomeration of metal particles, affecting its catalytic performance. active

Method used

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  • Low-temperature SCR denitration catalyst and preparation method and application thereof
  • Low-temperature SCR denitration catalyst and preparation method and application thereof
  • Low-temperature SCR denitration catalyst and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The graphene oxide used in the following examples is prepared by improving the Hummers method, and the specific steps are:

[0030] Pour 96mL of concentrated sulfuric acid (98% mass concentration) into a dry round bottom flask, then add 2gNaNO 3 , after stirring and dissolving, add 2g flake graphite. After the flake graphite is uniformly dispersed in the solution, slowly add 12g KMnO4 into the flask and react for 1.45h. Then raise the temperature to 35°C, react under this condition for 2 hours, then add 80mL of deionized water very slowly, raise the temperature to 95°C, react for 30min, then add 200mL of deionized water, then add 10mL of 30% H2O2 solution, react for 10min , the reaction solution was centrifuged while it was hot, and the resulting precipitate was washed with 1000 mL of 5% hydrochloric acid to remove metal ions contained in the precipitate. Then, it was washed with deionized water until the pH of the solution was close to neutral, and dried in a vacuum o...

Embodiment 2

[0032] A preparation method of a low-temperature SCR denitration catalyst, the specific steps are:

[0033] (1) Weigh 6.6 mg of graphite oxide into a beaker, add 80 mL of deionized water, and perform ultrasonic treatment at 80 W and 40 KHz for 30 min to obtain a graphene oxide dispersion. Add 6mmol (0.948g) KMnO to the graphene oxide dispersion 4 , stirred magnetically at room temperature until completely dissolved, and solution A was obtained.

[0034] (2) Weigh 1.2mmol (0.211g) L-ascorbic acid and dissolve it in 20mL deionized water, stir it to completely dissolve to obtain solution B (here KMnO 4 The molar ratio to L-ascorbic acid is 1:0.2, and the mass ratio of graphene oxide to manganese is 0.02:1). Under stirring state, solution B was slowly added dropwise to A, stirred at room temperature for 30 min, and the stirring speed was 400 r / min.

[0035] (3) The reaction solution was centrifuged, washed three times with deionized water, and then washed twice with absolute et...

Embodiment 3

[0038] A preparation method of a low-temperature SCR denitration catalyst, the specific steps are:

[0039] (1) Weigh 6.6 mg of graphite oxide into a beaker, add 80 mL of deionized water, and perform ultrasonic treatment at 80 W and 40 KHz for 30 min to obtain a graphene oxide dispersion. Add 6mmol (0.948g) KMnO to the graphene oxide dispersion 4 , stirred magnetically at room temperature until completely dissolved, and solution A was obtained.

[0040] (2) Weigh 3mmol (0.528g) L-ascorbic acid and dissolve it in 20mL deionized water, stir to make it completely dissolve to obtain solution B (here KMnO 4 The molar ratio to L-ascorbic acid is 1:0.5, and the mass ratio of graphene oxide to manganese is 0.02:1). Under stirring state, solution B was slowly added dropwise to A, stirred at room temperature for 30 min, and the stirring speed was 400 r / min.

[0041](3) The reaction solution was centrifuged, washed three times with deionized water, and then washed twice with absolute ...

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Abstract

The invention discloses a low-temperature SCR denitration catalyst and a preparation method thereof, and application of the catalyst to a low-temperature SCR flue gas denitration system. The preparation method comprises the following steps: weighing graphite oxide, putting the weighed graphite oxide in a beaker, adding deionized water, and carrying out ultrasonic dispersion to obtain a graphene oxide dispersion liquid; adding KMnO4 and L-ascorbic acid into the graphene oxide dispersion liquid, carrying out stirring at room temperature, centrifuging a reaction liquid, washing the obtained precipitate with deionized water and absolute ethyl alcohol, and drying the precipitate in a blast drying oven; and carrying out low-temperature pre-oxidation treatment on a sample in the blast drying ovento obtain the low-temperature SCR denitration catalyst. The preparation method is simple, and the prepared catalyst is fine in particle, large in specific surface area, good in dispersity, high in purity and good in low-temperature catalytic activity.

Description

technical field [0001] The invention belongs to the field of industrial catalysis in chemical engineering, and in particular relates to a preparation method of a low-temperature SCR denitrification catalyst. Background technique [0002] With the rapid development of the national economy, the use of fossil energy has become more and more frequent. The combustion of these energy sources will produce various nitrogen oxides. If the emission of these gases is not controlled, it will lead to acid rain, photochemical Smog, the hole in the ozone layer and human respiratory diseases have seriously affected human health. Therefore, for the sake of human living environment and human health, the removal of nitrogen oxides is imminent. There are many ways to remove nitrogen oxides, such as SCR, SNCR, absorption method, electron beam technology and microbial method. Currently NH 3 -SCR technology is the most commonly used method for stationary source nitrogen oxide removal, and has b...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J35/10B01D53/86B01D53/56
CPCB01J23/34B01D53/8628B01D2258/0283B01D2251/2062B01J35/23B01J35/651B01J35/633B01J35/647Y02A50/20
Inventor 金双玲王江灿杨烁吴家辉古飞蛟魏旭东兰亚鑫韩奇钱晨亮李俊强金鸣林张睿刘艳
Owner SHANGHAI INSTITUTE OF TECHNOLOGY
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