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Nano Cerium-zirconium base compound oxide and preparation process thereof

A composite oxide, cerium zirconium technology, applied in chemical instruments and methods, catalyst activation/preparation, separation methods, etc., can solve the problems of high cost and complicated operation steps, and achieve high storage/release capacity and oxygen storage capacity. High, small grain effect

Inactive Publication Date: 2003-10-22
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has complex operation steps and high cost

Method used

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  • Nano Cerium-zirconium base compound oxide and preparation process thereof
  • Nano Cerium-zirconium base compound oxide and preparation process thereof
  • Nano Cerium-zirconium base compound oxide and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 24.8gZr(NO 3 ) 4 ·5H 2 O, 25.1gCe(NO 3 ) 3 ·6H 2 O and 100ml of deionized water are heated and dissolved to make solution (I), and 60ml of ammonia water is dissolved in 60ml of water to make solution (II). Put a little ammonia water at the bottom of the flask in advance, control the pH value at 9.5-10.5, and stir vigorously At the same time, solution (I) and solution (II) were added dropwise to the flask to form a purple precipitate, which was stirred at room temperature for 0.5-1 hour and then aged for 24 hours, and the precipitated hydroxide after static aging was suction-filtered and heated at 110°C After drying, bake at 550°C for 5 hours to obtain a single cerium-zirconium composite oxide with a specific surface area of ​​68.6m 2 / g, after calcination at 900℃ for 6 hours, the specific surface area is 21.4m 2 / g.

Embodiment 2

[0028] Take 24.8g Zr(NO 3 ) 4 ·5H 2 O, 25.1g Ce(NO 3 ) 3 ·6H 2O and 100ml deionized water are heated and dissolved to make solution (I), get 15ml hydrogen peroxide and 60ml ammonia water and dissolve in 60ml water to make solution (II), put a little ammonia water in advance at the bottom of the flask, control the pH value at 9.5-10.5, Stir vigorously and add solution (I) and solution (II) dropwise to the flask at the same time to form a yellow precipitate. Stir at room temperature for 0.5-1 hour and then age statically for 24 hours. Suction filter the precipitated hydroxide after static aging , after being dried at 110°C, and then calcined at 550°C for 5 hours, a single cerium-zirconium composite oxide can be obtained with a specific surface area of ​​107.4 m 2 / g, after calcination at 900℃ for 6 hours, the specific surface area is 32.2m 2 / g.

Embodiment 3

[0030] Take 24.8g Zr(NO 3 ) 4 ·5H 2 O, 25.1g Ce(NO 3 ) 3 ·6H 2 O, 4.8gLa(NO 3 ) 3 ·nH 2 O and 100ml deionized water are heated and dissolved to make solution (I), get 15ml hydrogen peroxide and 60ml ammonia water and dissolve in 60ml water to make solution (II), put a little ammonia water in advance at the bottom of the flask, control the pH value at 9.5-10.5, Add solution (I) and solution (II) dropwise under vigorous stirring to form a yellow precipitate, stir at room temperature for 0.5-1 hour and then age it statically for 24 hours, filter the precipitated hydroxide after static aging, and pass through 110 After drying at 550°C for 5 hours, cerium-zirconium-lanthanum composite oxide can be obtained with a specific surface area of ​​92.4m 2 / g, after calcination at 900℃ for 6 hours, the specific surface area is 38.2m 2 / g.

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Abstract

The present invention discloses a nano cerium zirconium based compound oxide and its preparation method. Said invented cerium zirconium based compound oxide includes (wt%) 10-90% of CeO2 and 10-90% of ZrO2, and its crystal grain size is greater than or equal to 4 nm or less than or equal to 80 nm. Its preparation method includes the following steps: dissolving nitrates of Ce, Zr and one or more than one metal elements B (B is Ca or Sr or Ba or Mn or Al or Si or any one of rare earth elements except for Ce) in water to prepare solution (I); using hydrogen peroxide and ammonia water and dissolving them in the water to obtain solution (II); adding solution (I) and solution (II) into ammonia water solution, reacting, ageing, suction filtering, drying and roasting at 500-1000 deg.C so as to obtain the invented product with higher chemical activity and thermal stability.

Description

technical field [0001] The invention relates to a catalytic material, in particular to a 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 catalyst can remove harmful components CO, HC and NO in exhaust gas x converted into harmless CO 2 、H 2 O and N 2 After removal, it is called a three-way catalyst (TWC), which involves both oxidation and reduction reactions. Automobile exhaust purification catalysts are different from most industrial catalysts. Its operating conditions (such as temperature, exhaust volume, gas composition, etc.) are changing with the driving conditions of the vehicle. It is an unsteady condition. The operation process, that is, the ai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/94B01J21/06B01J23/10B01J37/03
Inventor 卢冠忠张顺海郭耘王幸宜郭杨龙王筠松刘晓晖
Owner EAST CHINA UNIV OF SCI & TECH
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