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A three-dimensional composite oxide catalyst for simultaneously eliminating NO and soot particles, its preparation method and use

A composite oxide and three-dimensional composite technology, which is applied in the field of three-dimensional ordered macroporous composite oxide catalysts and their preparation, can solve the problems of unsatisfactory catalytic activity, inability to remove harmful substances, and easy agglomeration of catalysts, etc., to achieve effective Good for catalyst activity, short preparation cycle, and full use of specific surface area

Inactive Publication Date: 2018-07-03
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the catalyst prepared by this method shows good catalytic activity to soot particles, the method is prone to caking phenomenon in the preparation process, causing the catalyst to easily agglomerate, affecting uniformity, reducing catalytic activity, and its effect on NO x The catalytic activity of the catalyst is not very ideal, and it is impossible to comprehensively remove the harmful substances in the exhaust gas of motor vehicles.

Method used

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  • A three-dimensional composite oxide catalyst for simultaneously eliminating NO and soot particles, its preparation method and use
  • A three-dimensional composite oxide catalyst for simultaneously eliminating NO and soot particles, its preparation method and use
  • A three-dimensional composite oxide catalyst for simultaneously eliminating NO and soot particles, its preparation method and use

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Embodiment 1: preparation composition is Ce 0.5 Fe 0.4 Zr 0.1 o 2 three-dimensional composite oxide catalyst

[0068] At a stirring rate of 200r / min, 5.48g cerium ammonium nitrate, 3.23g ferric nitrate and 0.65g zirconium oxychloride (wherein the molar ratio of cerium ammonium nitrate, ferric nitrate and zirconium oxychloride is 5:4:1 ) was dissolved in a mixed solution of absolute ethanol and methanol, and then stirred evenly at 25°C to form a precursor solution; 6g of the template polymethyl methacrylate (PMMA) was weighed and added to the precursor solution at room temperature (15-25 ℃) impregnated for 12 hours, then suction filtered, and the obtained solid was dried at 40 ℃ for 2 hours; the dried obtained solid was heated from room temperature (15-25 ℃) to 310 ℃ in a tubular heating furnace and kept for 4 hours, and then heated at the same heating rate Raise the temperature to 450°C and keep it warm for 4h, then the composition becomes Ce 0.5 Fe 0.4 Zr 0.1 o ...

Embodiment 2

[0072] Embodiment 2: preparation composition is Ce 0.6 Fe 0.3 Zr 0.1 o 2 three-dimensional composite oxide catalyst

[0073] Dissolve 6.58g of cerium ammonium nitrate, 2.42g of ferric nitrate and 0.86g of zirconium nitrate (the molar ratio of cerium ammonium nitrate, ferric nitrate and zirconium nitrate is 6:3:1) at a stirring rate of 150-200r / min In a mixed solution of absolute ethanol and methanol, then stir evenly at 30°C to form a precursor solution; weigh 8g of the template agent polymethyl methacrylate (PMMA) and add it to the precursor solution at room temperature (15-25°C) Immerse for 15 hours, then filter with suction, and dry the obtained solid at 50°C for 3 hours; heat the dried obtained solid from room temperature (15-25°C) to 310°C in a tubular heating furnace and keep it warm for 4 hours, and then raise the temperature to 500°C and keep it warm for 5h, the composition is Ce 0.6 Fe 0.3 Zr 0.1 o 2 three-dimensional composite oxide catalysts.

[0074] In a ...

Embodiment 3

[0076] Embodiment 3: preparation composition is Ce 0.7 Fe 0.2 Zr 0.1 o 2 three-dimensional composite oxide catalyst

[0077] Dissolve 7.68g of cerium ammonium nitrate, 1.62g of ferric nitrate and 0.86g of zirconium nitrate (the molar ratio of cerium ammonium nitrate, ferric nitrate and zirconium nitrate is 7:2:1) at a stirring rate of 250-300r / min In a mixed solution of absolute ethanol and methanol, then stir evenly at 40°C to form a precursor solution; weigh 8g of the template polymethyl methacrylate (PMMA) and add it to the precursor solution at room temperature (15-25°C) Immerse for 18 hours, then suction filter, and dry the obtained solid at 65°C for 4 hours; heat the dried obtained solid from room temperature (15-25°C) to 310°C in a tubular heating furnace and keep it warm for 4 hours, and then raise the temperature to 550°C and keep it warm for 4h, the composition is Ce 0.7 Fe 0.2 Zr 0.1 o 2 three-dimensional composite oxide catalysts.

[0078] In a continuous-...

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Abstract

The invention provides a three-dimensional composite oxide catalyst for removing NO and coal smoke particles simultaneously and a preparation method and application thereof.The preparation method comprises the steps that under the stirring condition, a cerium source, an iron source and a zirconium source are dissolved in an organic solvent, the mixture is stirred to be uniform at the temperature of 20 DEG C to 45 DEG C, and a precursor solution is formed; a template agent is weighed and added to the precursor solution to be dipped, and then suction filtration and drying are carried out; solids obtained through drying are heated in a heating furnace for the first time and heat preservation is carried out, and then the solids obtained through drying are heated for the second time and heat preservation is carried out, and the three-dimensional composite oxide catalyst is obtained.The three-dimensional composite oxide catalyst is a cerium, iron and zirconium composite oxide, and the composition of the catalyst is Ce0.9-xFexZr0.1O2, wherein x ranges from 0.1 to 0.4.According to the catalyst, the temperature at which the coal smoke particles are combusted to be converted into CO2 and the temperature for NO conversion can be reduced to the same range, meanwhile, the NO conversion rate is increased, and the activity of catalytic coal smoke combustion is improved.

Description

technical field [0001] The invention belongs to the technical field of pollutant purification, and relates to a catalyst for simultaneously eliminating NO and soot particles and a preparation method thereof, in particular to a three-dimensional ordered macroporous composite oxide catalyst for simultaneously eliminating NO and soot particles and its preparation method. Background technique [0002] In order to alleviate the resource and environmental problems faced by people, diesel engines are favored by people instead of gasoline engines. Compared with gasoline engines, diesel engines are widely used due to their high combustion calorific value, sufficient power, good economy and low fuel consumption. However, the harm caused by the diesel engine cannot be ignored. It not only restricts the development of the economy, but also seriously threatens human health due to the pollutants emitted by it, such as carbon black particles, NOx, CO and HC. [0003] Carbon monoxide (CO)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01D53/86B01D53/56
CPCB01D53/8628B01D2255/2065B01D2255/20715B01D2255/20738B01D2255/40B01D2255/65B01J23/002B01J23/83B01J2523/00B01J2523/3712B01J2523/48B01J2523/842
Inventor 刘坚程颖赵震于富红崔丽凤韦岳长宋卫余张潇李建梅
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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