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Denitration catalyst employing shape effect for enhancing low temperature activity, preparation method and application thereof

A denitration catalyst and effect technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve low-temperature catalytic activity and selectivity is not high enough, active temperature window It is not wide enough, restricting the industrial application of catalysts, etc., to reduce and avoid catalyst poisoning, broad market application prospects, and low preparation costs.

Inactive Publication Date: 2016-06-15
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research is mainly carried out on the amorphous metal oxide active components, the preparation method is relatively complicated, the low-temperature catalytic activity and selectivity are not high enough, and the activity temperature window is not wide enough, which limits the further industrial application of the catalyst.

Method used

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  • Denitration catalyst employing shape effect for enhancing low temperature activity, preparation method and application thereof
  • Denitration catalyst employing shape effect for enhancing low temperature activity, preparation method and application thereof
  • Denitration catalyst employing shape effect for enhancing low temperature activity, preparation method and application thereof

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Effect test

preparation example Construction

[0026] CeO with different shapes 2 The preparation method of carrier, its characteristic steps are as follows:

[0027] (1) Cubic CeO 2 : Take a certain amount (9.6g) of solid sodium hydroxide and dissolve it in 30ml of deionized water, adjust the lye concentration to 6mol / L, then dissolve and cool to room temperature; take a certain amount of (2mmol, 0.87g) cerous nitrate Dissolve in 10ml of deionized water, stir to dissolve to room temperature, mix and stir the two for half an hour, then transfer the formed flocculent liquid to a hydrothermal reaction kettle, and conduct a hydrothermal reaction at 180°C for 24 hours. The mixture was taken out, centrifuged, washed with distilled water until neutral, the mixture was put into an oven and dried at 110°C for 12 hours, and finally the dried product was taken out and roasted in a muffle furnace at 400°C for 3 hours to obtain cubic CeO 2 .

[0028] (2) Octahedral CeO 2: Take a certain amount (1mmol, 0.43g) of cerous nitrate and ...

Embodiment 1

[0037] Cubic Morphology CeO 2 The preparation method of carrier, its characteristic steps are as follows:

[0038] Weigh a certain amount (9.6g) of solid sodium hydroxide and dissolve it in 30ml of deionized water, adjust the concentration of lye to 6mol / L, then dissolve and cool to room temperature; weigh a certain amount (2mmol, 0.87g) of cerous nitrate solution In 10ml of deionized water, stir and dissolve to room temperature, mix and stir the two for half an hour, then transfer the formed flocculent liquid to a hydrothermal reaction kettle, and conduct a hydrothermal reaction at 180°C for 24 hours. After the hydrothermal reaction is completed, the mixture Take it out, centrifuge it, wash it with distilled water until it is neutral, put the mixture in an oven and dry it at 110°C for 12 hours, and finally take out the dried product and bake it in a muffle furnace at 400°C for 3 hours to obtain cubic CeO 2 , which looks like figure 1 shown. From figure 1 -(a) It can be fo...

Embodiment 2

[0040] Octahedral CeO 2 The preparation method of carrier, its characteristic steps are as follows:

[0041] Take a certain amount (1mmol, 0.43g) of cerous nitrate and dissolve it in 25ml of deionized water, add 15ml of toluene, add 0.15ml of tert-butylamine after completely dissolving, and transfer the flocculent liquid to the hydrothermal reaction kettle after stirring for half an hour. 180°C hydrothermal reaction for 24h, the mixture was taken out after the hydrothermal reaction, centrifuged, washed with ethanol for 3 times, the resultant was put into an oven and dried at 110°C for 12h, after drying, it was roasted in a muffle furnace at 400°C for 3h , to obtain octahedral CeO 2 , which looks like figure 2 shown. From figure 2 -(a) it can be seen that the CeO prepared by this method 2 The carrier presents a typical octahedral morphology, while from figure 2 -(b) Octahedral CeO can be seen 2 The nanometer size of the carrier is relatively uniform.

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Abstract

The invention discloses a preparation method of a denitration catalyst employing shape effect for enhancing low temperature activity, which belongs to the technical field of control of atmosphere pollution. The method comprises the following steps: 1) weighing a CeO2 carrier and dissolving the CeO2 carrier in deionized water, weighing a manganous nitrate solution according to a mol ratio of Mn to Ce being 1.5:5-2:5, dumping the weighed CeO2 carrier in the manganous nitrate solution to obtain reaction liquid; 2) evaporating the reaction liquid under oil bath to dryness, then placing the material in a roasting oven for drying the material at the temperature of 105-115 DEG C to obtain a dried material; and 3) calcinating the dried material in a muffle furnace at the temperature of 395-405 DEG C for 3-4 hours to obtain the denitration catalyst employing shape effect for enhancing low temperature activity which takes CeO2 as the carrier. The invention also discloses the catalyst prepared by the method and an application thereof. The denitration catalyst has the advantages of good low temperature activity, high selectivity and wide activity temperature window. The preparation method has the advantages of simple and controllable process, and convenient operation process, and can be used in tail ends of the flue gas purifying apparatus in fire coal power plants, cement plants, and glass kilns and furnaces. The preparation method has the characteristics of energy saving and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and in particular relates to the preparation and application of a denitrification catalyst whose low-temperature activity is enhanced by morphology effects. Background technique [0002] As one of the main pollutants in the atmosphere, nitrogen oxides (NOx) will not only cause serious pollution to the atmospheric environment and soil, form acid rain and photochemical smog, cause soil quality to decline, and crop yields to decrease; it will also cause serious damage to human health. Serious effects and hazards. With the increasingly serious situation of air pollution, environmental protection standards are also constantly improving. Therefore, various countries have strictly controlled and regulated their emissions. As the main source of nitrogen oxides, coal-fired power plants mainly use selective catalytic reduction (SCR) to control and remove nitrogen oxides (NOx). Nitrogen oxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J23/10B01D53/86B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01J23/10B01J23/34B01D2255/2073B01D2255/2065B01D2257/404B01J35/50B01J35/40
Inventor 董林王晓波邵晔马凯丽邹伟欣
Owner NANJING UNIV
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