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Cerium zirconium aluminum composite oxide oxygen storage material and preparation method thereof

A technology for composite oxides and oxygen storage materials, which is applied in the field of cerium-zirconium-aluminum composite oxide oxygen storage materials for automobile exhaust purification and its preparation, and can solve the problems of high temperature aging resistance, low specific surface area of ​​products, and complicated preparation methods, etc. , to achieve the effects of good anti-aging performance, easy-to-obtain raw materials, and excellent oxygen storage and release performance

Active Publication Date: 2014-02-12
浙江华明新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Chinese patent CN1695798A discloses a method for preparing a cerium-zirconium-aluminum-based oxygen storage material, but a stabilizer needs to be added during the preparation process, the preparation method is complicated, and the requirements for equipment are relatively high
Chinese patent CN101112683A discloses a one-step method for preparing cerium-zirconium-aluminum composite oxides. Surfactants are added before precipitation, and the filter cake is baked after traditional drying. The specific surface area of ​​the product is low, and the high temperature aging resistance There are still problems

Method used

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  • Cerium zirconium aluminum composite oxide oxygen storage material and preparation method thereof
  • Cerium zirconium aluminum composite oxide oxygen storage material and preparation method thereof
  • Cerium zirconium aluminum composite oxide oxygen storage material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] Add 114.3 g of pseudo-boehmite with an alumina content of 70% to 216.0 g of deionized water, add 30.0 g of Tween 80, and heat and stir in a 90°C water bath for 1 h; 25.6 g of cerium nitrate and 30.3 g of zirconium nitrate were used 200g of deionized water was dissolved, 26.4g of hydrogen peroxide (15wt%) was added, fully oxidized, added to the above solution, and kept for 1h; ammonia water with a concentration of 25wt% was added, and the pH of the control end point was 10, and the temperature was kept for 1h. Then stop stirring, age at 90°C for 3h, filter to obtain a precipitate, wash with water until neutral, add 50g of polyethylene glycol 400 to the filter cake, beat and disperse, put it in a muffle furnace for 550°C roasting for 3h, the heating rate At 2°C / min, the cerium-zirconium-aluminum composite oxide oxygen storage material of the present invention is obtained.

[0031] The composition of the material is 10% ceria, 10% zirconia, and 80% alumina. The fresh spec...

Embodiment 2

[0033] Add 71.4 g of pseudo-boehmite with an alumina content of 70% to 324.9 g of deionized water, add 10.0 g of sodium dodecyl sulfate, and heat and stir in a 50°C water bath for 3 hours; 76.9 g of cerium nitrate and 60.6 g of Zirconium nitrate was dissolved in 200g deionized water, 17.0g hydrogen peroxide (35wt%) was added, fully oxidized, added to the above solution, and kept for 3h; ammonia water with a concentration of 25wt% was added, and the pH of the control end point was 9, and the temperature was kept for 4h . Then stop stirring, age at 50°C for 4h, filter to obtain a precipitate, wash with water until neutral, add 50g of Tween 80 to the filter cake, beat and disperse, put it in a muffle furnace for 700°C roasting for 8h, and the heating rate is 10 ℃ / min to obtain the cerium-zirconium-aluminum composite oxide oxygen storage material of the present invention.

[0034] The composition of the material is 30% ceria, 20% zirconia, and 50% alumina. The fresh specific sur...

Embodiment 3

[0036] Add 85.7 g of pseudo-boehmite with an alumina content of 70% to 200 g of deionized water, add 20.0 g of cetyltrimethylammonium bromide, heat and stir in a water bath at 70 °C for 2 hours; add 59.0 g of cerium nitrate and 51.5g of zirconium nitrate were dissolved in 200g of deionized water, added with 18.2g of hydrogen peroxide (30wt%), fully oxidized and added to the above solution, kept for 2h; the concentration of 25wt% of ammonia water was added dropwise, and the pH of the control end point was 9.5 as Accurate, keep warm for 2h. Then stop stirring, 70 ℃ Aged for 2h, filtered to obtain the precipitate, washed with water until neutral, added 80g ethylene glycol butyl ether to the filter cake, beaten and dispersed, placed in a muffle furnace and calcined at 600°C for 4h, the heating rate was 5°C / min, The cerium-zirconium-aluminum composite oxide oxygen storage material of the present invention is obtained.

[0037] The composition of the material is 23% ceria, 17% zir...

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Abstract

The invention discloses a cerium zirconium aluminum composite oxide oxygen storage material and a preparation method thereof. According to the cerium zirconium aluminum composite oxide oxygen storage material, the particle size is 5 to 10 nm; the BET specific surface area is 200 to 240 m<2> / g; the pore volume is 0.50 to 0.70 cm<3> / g; the average pore size is 5 to 10 nm; a cerium zirconium solid solution has a stable cubic fluorite structure. The cerium zirconium aluminum composite oxide oxygen storage material provided by the invention has the characteristics of stable structure, large specific surface area, excellent oxygen storage performance and excellent anti-ageing performance. The preparation method provided by the invention has the advantages of easily accessible raw materials and low production cost, and is suitable for industrialized amplification production.

Description

technical field [0001] The invention relates to an oxygen storage material and a preparation method thereof, in particular to a cerium-zirconium-aluminum composite oxide oxygen storage material used in automobile exhaust gas purification and a preparation method thereof. Background technique [0002] As a key component of oxygen storage materials in three-way catalysts, ceria plays a major role in storing and releasing oxygen. However, single-component cerium oxide is easily sintered at 850 °C, resulting in a sharp decrease in specific surface area, collapse of pore structure, and poor oxygen storage and release performance. Studies have shown that after ceria and zirconia form a solid solution, as zirconium atoms enter the lattice of ceria, the oxygen storage and release capacity and high temperature performance have been greatly improved, but it still cannot meet the increasingly stringent environmental protection requirements. [0003] Recently published research results...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10
Inventor 马新胜周益赵月昌贾嘉吴秋芳高玮
Owner 浙江华明新材料科技有限公司
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