Macroporous Ce-Zr based composite metal oxide catalyst, preparation method, and application thereof

A composite oxide and composite metal technology, applied in the field of environmental purification, can solve the problems of high specific surface area, high porosity, and unsatisfactory purification effect of PM and NOx, and achieve low catalyst cost, uniform pore wall thickness, and favorable catalyst active effect

Inactive Publication Date: 2017-04-26
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present inventors have developed an improved 3D complex oxidized type catalytic converter that uses special materials made up from different types of metals or ceramics mixed together instead of just one single element like platinum (Pt). These new composites help improve their performance without adding any extra elements such as other noble metals. By creating these unique structures within each component separately, they allow gas molecules to pass through while still being able to react properly on them before reaching another part called the reactor''. Overall, this technology improves fuel efficiency and reduces harmful emissions produced during combustion processes.

Problems solved by technology

The present research focuses towards developing efficient methods for removing harmful gases such as sulfur dioxin, methane, etc., especially during dieseling operations. However, currently available catalysis systems suffer from poor activity when dealing with both types of contaminant materials like SO2. To address this issue, there is a desire to develop a catalyzer capable of efficiently decompositing multiple different substances without causing negative side impacts upon humans and environments.

Method used

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  • Macroporous Ce-Zr based composite metal oxide catalyst, preparation method, and application thereof
  • Macroporous Ce-Zr based composite metal oxide catalyst, preparation method, and application thereof
  • Macroporous Ce-Zr based composite metal oxide catalyst, preparation method, and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Example 1: Ce 0.8 Fe 0.1 Zr 0.1 o 2 Catalyst preparation

[0058] At a stirring rate of 200r / min, 0.176g of cerium ammonium nitrate, 0.061g of ferric sulfate and 0.129 g of zirconium oxychloride (wherein the molar ratio of cerium ammonium nitrate, ferric sulfate and zirconium oxychloride is 8:1:1) Dissolve in a mixed solution of absolute ethanol and methanol, then stir evenly at 25°C to form a precursor solution; weigh 6g of the template polymethyl methacrylate (PMMA) and add it to the precursor solution at room temperature (15-25°C ) impregnated for 12 hours, and then suction filtered, and the obtained solid was dried at 40°C for 8 hours; the dried obtained solid was heated from room temperature (15-25°C) to 310°C in a tubular heating furnace and kept for 4 hours, and then heated at the same heating rate to 450°C and keep it warm for 4h, the composition is Ce 0.8 Fe 0.1 Zr 0.1 o 2 three-dimensional composite oxide catalysts.

[0059] Utilize the Ce that embodi...

Embodiment 2

[0066] Example 2: Ce 0.8 mn 0.1 Zr 0.1 o 2 Catalyst preparation

[0067] At a stirring rate of 200r / min, 0.176g cerium ammonium nitrate, 0.072g manganese nitrate and 0.129g zirconium oxychloride (wherein the molar ratio of cerium ammonium nitrate, manganese nitrate and zirconium oxychloride is 8:1:1 ) was dissolved in a mixed solution of polyethylene glycol 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°C) for 12 hours, then suction filtered, and the obtained solid was dried at 40°C for 6 hours; the dried solid was raised from room temperature (15-25°C) to 310°C in a tubular heating furnace and kept for 4 hours, and then heated at the same temperature Raise the temperature to 500°C and hold it for 4 hours, and then the composition becomes Ce 0.8 mn 0.1 Zr 0.1 o 2 three-dimensional composite oxide catalysts.

[0068]...

Embodiment 3

[0075] Example 3: Ce 0.8 co 0.1 Zr 0.1 o 2 Catalyst preparation

[0076] At a stirring rate of 200r / min, dissolve 0.139g of cerium nitrate, 0.116g of cobalt nitrate and 0.129g of zirconium oxychloride (wherein the molar ratio of cerium nitrate, cobalt nitrate and zirconium oxychloride is 8:1:1) In a mixed solution of absolute ethanol and methanol, then stir evenly at 25°C to form a precursor solution; weigh 6g of the template polymethyl methacrylate (PMMA) and add it to the precursor solution at room temperature (15-25°C) Immerse for 12 hours, then filter with suction, and dry the obtained solid at 40°C for 10 hours; heat the dried obtained solid from room temperature (20-30°C) to 310°C in a tubular heating furnace and keep it warm for 4 hours, and then heat up to 450°C and keep it warm for 4h, the composition is Ce 0.8 co 0.1 Zr 0.1 o 2 three-dimensional composite oxide catalysts.

[0077] Utilize the Ce that embodiment 3 makes 0.8 co 0.1 Zr 0.1 o 2 Catalyst elim...

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Abstract

The invention provides a macroporous Ce-Zr based composite metal oxide catalyst, a preparation method, and an application thereof. The composite metal oxide catalyst is a Ce-X-Zr composite oxide and has the constitution of Ce0.8X0.1Zr0.1O2, wherein X is Fe, Mn, Co or Ni. The preparation method includes the steps of in-situ-doping and dissolving one of an iron source, a manganese source, a cobalt source and a nickel source in a cerium source and a zirconium source, and performing carbon template supporting process to synthesize the composite metal oxide. The catalyst can reduce the temperatures of catalytic combustion of PM into CO2 and catalytic reduction of NO into N2 into the same range, and also is improved in activities of catalyzing the PM combustion and NO conversion rate. The preparation method is simple and has short period and low cost. The catalyst is suitable for PM and NO removal in tail gas of diesel vehicles and has excellent application prospect.

Description

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Claims

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Application Information

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Owner CHINA UNIV OF PETROLEUM (BEIJING)
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