Preparation method of low-temperature high-efficiency denitrification catalyst MnO2

A denitrification catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as poor denitrification effect, and achieve high and stable removal rate Good performance and high selective catalytic reduction activity

Inactive Publication Date: 2015-04-01
NANKAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But conventional MnO 2 The denitrification effect of the low temperature catalyst is poor, so the MnO 2 The denitrification effect of low temperature catalyst is of great significance

Method used

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  • Preparation method of low-temperature high-efficiency denitrification catalyst MnO2
  • Preparation method of low-temperature high-efficiency denitrification catalyst MnO2
  • Preparation method of low-temperature high-efficiency denitrification catalyst MnO2

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Embodiment

[0022] A low-temperature and high-efficiency denitration catalyst MnO 2 The preparation method, the steps are as follows:

[0023] 1) Dissolve 6g of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (P123) in a mixture of 217g of deionized water and 11.8g of 35wt% hydrochloric acid, add 6g of butanol, Stir at 35oC for 1 hour, then add 12.9g tetraethyl orthosilicate (TEOS), and stir at 35oC for 24 hours to obtain a mixed solution;

[0024] 2) Pour the above mixed solution into a closed polypropylene reactor, react at 100oC for 24 hours, collect the obtained solid by centrifugation and dry it at 100oC;

[0025] 3) The above-mentioned dried solid was washed with ethanol-35wt% hydrochloric acid mixture with a volume ratio of 1:1, and then calcined at 550oC to obtain the KIT-6 template;

[0026] 4) Dissolve 3g of manganese nitrate in 25mL of ethanol to obtain a manganese nitrate-ethanol mixture, add 1g of the above KIT-6 template to the manganese nitrat...

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Abstract

The invention relates to a preparation method of a low-temperature high-efficiency denitrification catalyst MnO2, which comprises the following steps: dissolving P123 in a deionized water-hydrochloric acid mixed solution, sequentially adding butanol and ethyl orthosilicate, and stirring; pouring into a closed polypropylene reaction kettle to react, collecting the solid, and drying; cleaning with an ethanol-hydrochloric acid mixed solution, and calcining to obtain a KIT-6 template; dropwisely adding into a manganous nitrate-ethanol mixed solution, stirring, separating the precipitate, cleaning with a sodium hydroxide solution and deionized water to a neutral state, and drying; and calcining in a muffle furnace to obtain the target substance. Compared with the traditional MnO2 catalyst, the mesoporous-structure MnO2 catalyst has the advantages of large specific area, more adsorbed oxygen and high removal ratio of oxynitrides; the MnO2 catalyst has high stability, and the mesoporous structure is still stable after denitrification treatment; and the MnO2 catalyst has higher selective catalytic reduction activity at low temperature, and thus, has favorable application prospects.

Description

technical field [0001] The invention relates to the preparation technology of selective catalytic reduction technology (SCR) catalyst, especially a low-temperature and high-efficiency denitrification catalyst MnO 2 method of preparation. Background technique [0002] NOx has become an object that needs to be controlled because it can cause a series of environmental problems such as acid rain, ozone, and smog. So far, the mainstream technology for removing NOx in the atmosphere is selective catalytic reduction flue gas denitration technology. Therefore, the flue gas denitrification process mostly adopts a high dust arrangement process (that is, the SCR device is arranged before the electrostatic precipitator to avoid reheating the coal-fired flue gas). However, this process arrangement is not only costly, but also leads to poisoning and deactivation of the catalyst. Therefore, it is of great significance to study a low-temperature and high-efficiency denitration catalyst....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34C01G45/02
Inventor 展思辉李轶朱丹丹邱明英
Owner NANKAI UNIV
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