Method for enhancing catalytic performance of cerium-base denitrification catalyst and application thereof

A technology of denitration catalyst and catalytic performance, applied in the field of denitration catalyst, can solve the problems of high cost of denitration catalyst, industrial scale-up, difficult production, etc., and achieve the effects of improving redox performance, improving surface acidity, and promoting adsorption and activation.

Active Publication Date: 2017-02-01
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a simple, efficient, and low-cost method and application for improving the catalytic performance of cerium-based denitration catalysts, which is used to solve the problem of high cost of denitration catalysts in the prior art, and the industrialization Amplify problems such as production difficulties

Method used

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  • Method for enhancing catalytic performance of cerium-base denitrification catalyst and application thereof
  • Method for enhancing catalytic performance of cerium-base denitrification catalyst and application thereof
  • Method for enhancing catalytic performance of cerium-base denitrification catalyst and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] 1. CeO 2 preparation of

[0033] Accurately weigh 75.6890g of Ce(NO 3 ) 3 ·6H 2 O, after grinding in an agate mortar for 60 min, place it in a ceramic crucible, then put the ceramic crucible into a muffle furnace, and raise the temperature from room temperature to 500 °C at a rate of 2 °C / min under 100 mL / min flowing air atmosphere, Keep the temperature for 5 hours, then take it out after natural cooling to room temperature, and grind it in an agate mortar for 60 minutes to prepare CeO 2 . Its XRD, H 2 -TPR, NH 3 -TPD and NH 3 -SCR reaction results are attached Figure 1-4 .

[0034] 2. CH 3 COOH(HAc) pretreatment CeO 2 (abbreviated as CeO 2 -Ac catalyst)

[0035] Accurately weigh 5.0000g of CeO 2 , and accurately measure 1.44ml of HAc (ie 25mmol HAc). Dilute the above HAc to 50ml with ultrapure water, and then add the weighed CeO 2 Immersed in diluted HAc solution. Stir magnetically for 3 hours until the mixture is uniform, then evaporate to dryness in ...

Embodiment 2

[0055] Accurately weigh 5 parts of 5.0000g CeO 2 , and accurately measure 28.8 μl of HAc (ie 0.5 mmol), 32.6 μl of concentrated HNO 3 (ie 0.5mmol), 40.4μl concentrated HCl (ie 0.5mmol), 30.8μl H 3 PO 4 (ie 0.5mmol) and 27.2μl concentrated H 2 SO 4 (ie 0.5 mmol). The above HAc, concentrated HNO 3 , concentrated HCl, H 3 PO 4 and concentrated H 2 SO 4 Dilute to 50ml respectively, then weigh the CeO 2 Immersed in diluted HAc, HNO 3 , HCl, H 3 PO 4 and H 2 SO 4 in solution. Stir magnetically for 3 hours until the mixture is evenly mixed, then evaporate to dryness in an oil bath at 80°C, dry overnight in a blast drying oven at 80°C, and grind evenly. After loading into a quartz boat, place it in a tube furnace, and in a static air atmosphere, raise the temperature from room temperature to 300-500°C at a rate of 10°C / min and keep the temperature constant for 5h. After natural cooling to room temperature, take it out and grind it evenly again to get HAc and HNO 3 , ...

Embodiment 3

[0057] Accurately weigh 5 parts of 5.0000g CeO2 , and accurately measure 14.4ml of HAc (ie 250mmol), 16.3ml of concentrated HNO 3 (i.e. 250mmol), 20.2ml concentrated HCl (i.e. 250mmol), 15.4ml of HCl 3 PO 4 (i.e. 250mmol) and 13.6ml concentrated H 2 SO 4 (ie 250mmol). The above HAc, concentrated HNO 3 , concentrated HCl, H 3 PO 4 and concentrated H 2 SO 4 Dilute to 50ml respectively, then weigh the CeO 2 Immersed in diluted HAc, HNO 3 , HCl, H 3 PO 4 and H 2 SO 4 in solution. Stir magnetically for 3 hours until the mixture is evenly mixed, then evaporate to dryness in an oil bath at 80°C, dry overnight in a blast drying oven at 80°C, and grind evenly. After loading into a quartz boat, place it in a tube furnace, and in a static air atmosphere, raise the temperature from room temperature to 300-500°C at a rate of 10°C / min and keep the temperature constant for 5h. After natural cooling to room temperature, take it out and grind it evenly again to get HAc and HNO ...

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Abstract

The invention provides a method for enhancing catalytic performance of a cerium-base denitrification catalyst and application thereof. The method comprises the following steps: 1) impregnating CeO2 in an acidic solution, uniformly mixing, and evaporating by heating; and 2) drying the evaporated product in the step 1), and roasting to obtain the cerium-base denitrification catalyst finished product. The catalyst has the advantages of excellent denitrification property, high anti-poisoning capacity, low cost, abundant required raw material resources and cheap and accessible raw materials. The preparation process is simple and convenient, is low in energy consumption, can implement large-scale production, and has wide industrial application prospects.

Description

technical field [0001] The invention relates to the field of denitration catalysts, in particular to a method and application for improving the catalytic performance of a cerium-based denitration catalyst. Background technique [0002] With the frequent appearance of smog, PM 2.5 It has become a household name, and its harmfulness has also attracted widespread attention. Nitrogen oxides (NO x ) as PM 2.5 One of the main precursors of , has become the focus of attention in recent years. Coal-fired power plants are NO x It is imminent to denitrify its flue gas. Studies have shown that ammonia (NH 3 ) selective catalytic reduction of NO x (NH 3 -SCR) is the most economical and effective technology for flue gas denitrification in coal-fired power plants. Over the past few decades, V 2 o 5 -WO 3 / TiO 2 and V 2 o 5 -MoO 3 / TiO 2 is NH 3 -The most commonly used commercial denitrification catalyst in SCR process. However, such catalysts have poor low-temperature a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01D53/86B01D53/56
CPCB01D53/8628B01J23/10
Inventor 姚小江杨复沫陈丽李红丽罗琼
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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