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Spherical cerium-zirconium base composite oxide and its preparing method

A composite oxide, cerium zirconium technology, applied in chemical instruments and methods, separation methods, metal/metal oxide/metal hydroxide catalysts, etc., to achieve the effects of excellent chemical activity, good thermal stability, and large specific surface area

Inactive Publication Date: 2007-03-28
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Pengpanich et al [Applied Catalysis A: General, 2002, 234: 221] prepared cerium-zirconium mixed oxides with urea as a precipitant, but unfortunately, when the prepared samples were at Ce:Zr=1 / 1, a certain degree of phase separation; when Ce:Zr<1 / 1, severe phase separation occurred

Method used

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  • Spherical cerium-zirconium base composite oxide and its preparing method
  • Spherical cerium-zirconium base composite oxide and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take 36.0g Ce(NO 3 ) 3 ·6H 2 O, 12.0g Zr(NO 3 ) 4 ·5H 2 After O and 100ml of deionized water are heated and dissolved, solution (I) is made after adding 15ml of hydrogen peroxide;

[0036] 15g urea is dissolved in 50ml deionized water to make solution (II);

[0037] Add the solution (I) to the solution (II) to the reaction kettle under stirring, heat with an oil bath, keep the temperature at 130°C for 2 hours, cool to 15°C after the reaction, and carry out the precipitation of the formed hydroxide After suction filtration, washed with deionized water and ethanol in sequence, the SEM photo after drying at 110°C for 10 hours is shown in Figure 3, and the surface area after calcination at 550°C for 4 hours is 135m 2 / g, the XRD spectrum is shown in Figure 1; the surface area after calcination at 1000°C for 6 hours is 21m 2 / g, SEM photos are shown in Figure 5.

Embodiment 2

[0039] Take 46.0g (NH 4 ) 2 Ce(NO 3 ) 6 , 12.0g Zr(NO 3 ) 4 ·5H 2 Add O into 150ml of deionized water under stirring, heat to dissolve, add 15g of urea, heat the reactor with an oil bath, keep the temperature at 125°C and keep it for 2h, cool to 30°C after the reaction, and react to the generated hydrogen After the oxide precipitate was suction filtered, washed with deionized water and ethanol respectively, and dried at 110°C for 10 hours, the SEM photo of the dried sample is shown in Figure 3; the surface area after calcination at 550°C for 4 hours was 137m 2 / g, the TEM photo is shown in Figure 2; after calcination at 1000°C for 6 hours, the surface area of ​​the obtained sample is 20m 2 / g.

Embodiment 3

[0041] Take 25.0g Ce(NO 3 ) 3 ·6H 2 O, 26.0g Zr(NO 3 ) 4 ·5H 2 After O and 100ml of deionized water are heated and dissolved, slowly add 15ml of hydrogen peroxide to make solution (I), dissolve 15g of urea in 50ml of deionized water to make solution (II); under stirring, add solution (I) to solution ( II) Put it into the reaction kettle, heat it with an oil bath, keep the temperature at 135°C for 2 hours, cool to room temperature after the reaction, filter the formed hydroxide precipitate, and wash it with deionized water and ethanol respectively , dried at 110°C for 10h, and calcined at 550°C for 4 hours, the surface area is 127m 2 / g, the XRD spectrum is shown in Figure 1; after roasting at 1000°C for 6 hours, the surface area of ​​the obtained sample is 25m 2 / g.

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Abstract

The present invention discloses a spherical cerium-zirconium base compound oxide and its preparation method. Said invention provides its structure general formula. Said invention adopts urea as precipitant, and utilizes the ammonia gas released by said urea when which is undergone the process of hydrothermal decomposition treatment at 125-135deg.C to make cerium, zirconium and nitrate produce uniform coprecipitation, so that it can make the obtained solid solution sample have the advantages of small grain size, large specific surface area, high oxygen-storing capacity and good thermal stability. Said compound oxide can be extensively used in various catalysts.

Description

technical field [0001] The invention relates to a spherical rare-earth-based composite oxide and a preparation method thereof, in particular to a rare-earth catalytic material used for a three-way catalyst (TWC) and a combustion catalyst for automobile tail gas purification. Background technique [0002] The pollution problem caused by automobile exhaust emission has received extensive attention in today's society. Catalytic purification of automobile exhaust is an effective way to reduce air pollution. Automobile exhaust catalysts can remove harmful components in exhaust gas such as carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NO x ) into harmless carbon dioxide (CO 2 ), nitrogen (N 2 ), and water vapor (H 2 O), so it is called three-way catalyst (Three-way Catalyst: TWC), which involves both oxidation reaction and reduction reaction. Automobile exhaust purification catalysts are different from most industrial catalysts. Its operating conditions (such as t...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J21/06B01J23/34B01D53/94
Inventor 卢冠忠郭耘张志刚郭杨龙王筠松王艳芹刘晓晖王幸宜
Owner EAST CHINA UNIV OF SCI & TECH
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