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Cerium-zirconium-aluminium-based composite oxide catalytic material and preparation method thereof

A composite oxide and catalytic material technology, applied in the field of cerium-zirconium-aluminum-based composite oxide catalytic materials and their preparation, can solve the problem of affecting the uniformity of the coating and the adhesion between the coating layer and the carrier, and affecting the catalytic activity of the oxygen storage material. and high temperature thermal stability, poor high temperature aging resistance of materials, etc., to achieve the effects of good high temperature aging resistance, high oxygen storage and release capacity, and large specific surface area.

Inactive Publication Date: 2013-10-16
上海华明高纳稀土新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The above method does not carry out surface treatment on the carrier, and the particle size and shape of the carrier all affect the uniformity of the coating and the adhesion between the coating layer and the carrier, and affect the catalytic activity and high temperature thermal stability of the oxygen storage material.
[0016] In summary, there are few studies on cerium-zirconium-aluminum-based rare earth oxygen storage materials, and there is a big contradiction between the binding force between cerium-zirconium and alumina and the high-temperature aging resistance, and the high-temperature aging resistance of the material is poor.

Method used

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  • Cerium-zirconium-aluminium-based composite oxide catalytic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Add 85.7kg of pseudo-boehmite with an alumina content of 70% into 857kg of pure water and stir in an 80°C aqueous solution for 4 hours; then add 52.6kg of cerium nitrate, 42.2kg of zirconium nitrate, and 2.6kg of lanthanum nitrate into the In the above feed liquid, continue to stir for 3h. Then spray drying, adding to the above solution and spray drying (the temperature of the feed port is 200°C) to obtain the precursor of the cerium-zirconium-aluminum composite oxide. Calcining the cerium-zirconium-aluminum composite oxide precursor at 550° C. for 6 hours to obtain the aluminum-cerium-zirconium-based composite oxide catalytic material.

[0048] The composition of the material is 20% of cerium oxide, 19% of zirconia, 1% of lanthanum oxide, and 60% of aluminum oxide. The material has a fresh specific surface area of ​​151m 2 / g, the specific surface area obtained after calcination of the material at 1000°C for 4h is 108m 2 / g.

Embodiment 2

[0050] Add 100kg of pseudoboehmite with an alumina content of 70% into 330kg of pure water and stir in an aqueous solution at 100°C for 2 hours; then add 65.8kg of cerium nitrate, 4.44kg of zirconium nitrate and 7.89kg of yttrium nitrate to the Feed liquid, continue to stir for 1h. Then spray drying, adding to the above solution and spray drying (the temperature of the feed port is 350° C.) to obtain the precursor of the cerium-zirconium-aluminum composite oxide. The cerium-zirconium-aluminum composite oxide precursor is calcined at 750° C. for 3 hours to obtain the aluminum-cerium-zirconium-based composite oxide catalytic material.

[0051] The composition of the material is 25% of cerium oxide, 2% of zirconia, 3% of yttrium oxide and 70% of alumina. The material has a fresh specific surface area of ​​151m 2 / g, the specific surface area obtained after calcination of the material at 1000°C for 4h is 108m 2 / g.

Embodiment 3

[0053] Add 92.9kg of pseudo-boehmite with an alumina content of 70% into 836kg of pure water and stir in an aqueous solution at 90°C for 2 hours; then mix 60.52kg of cerium nitrate, 20kg of zirconium nitrate, 2.63kg of lanthanum Yttrium nitrate was added to the above feed solution, and stirring was continued for 1h. Then spray drying (the temperature of the feed port is 300° C.) to obtain the precursor of the cerium-zirconium-aluminum composite oxide. The cerium-zirconium-aluminum composite oxide precursor is calcined at 750° C. for 3 hours to obtain the aluminum-cerium-zirconium-based composite oxide catalytic material.

[0054] The composition of the material is 23% of cerium oxide, 9% of zirconia, 2% of yttrium oxide, 1% of lanthanum nitrate and 65% of alumina. The material has a fresh specific surface area of ​​181m 2 / g, the specific surface area obtained after calcination of the material at 1000°C for 4h is 123m 2 / g.

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Abstract

The invention discloses a cerium-zirconium-aluminium-based composite oxide catalytic material and a preparation method thereof. The cerium-zirconium-aluminium-based composite oxide catalytic material is characterized by comprising cerium oxide, zirconium oxide, aluminium oxide and composite oxide consisting of other rare-soil oxides except cerium. According to the preparation method, the hydrolytic treatment is carried out on the aluminium oxide to form aluminium hydroxide, and then the aluminium hydroxide is fully mixed with mixed metal salt solution. The preparation merthod provided by the invention has the advantages that the mutual action between the aluminium oxide and the cerium-zirconium-aluminium-based composite oxide is enhanced, the distribution uniformity between the aluminium oxide and the cerium-zirconium-aluminium-based composite oxide is fully guaranteed, and a product has the characteristics of large specific surface area, good high-temperature ageing resistance and high oxygen storage capability and the like, and is applicable to waste-gas purification or catalytic combustion such as automobile tail-gas purification, organic-waste-gas elimination and natural-gas catalytic combustion.

Description

technical field [0001] The invention relates to a catalytic material and a preparation method thereof, in particular to a cerium-zirconium-aluminum-based composite oxide catalytic material suitable for exhaust gas purification or catalytic combustion such as automobile exhaust purification, organic waste gas elimination, and natural gas catalytic combustion, and a preparation method thereof. Background technique [0002] Reducing vehicle exhaust pollution, protecting the quality of the atmospheric environment, and realizing the sustainable development of the ecological environment and society are one of the important issues of my country's environmental protection at present and in the future for a long time. [0003] In order to reduce pollution, breakthroughs must be made in three aspects: improving the quality of gasoline, improving the combustion state of the engine, and increasing the catalytic efficiency of exhaust gas purification. So far, the most effective way to us...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01D53/94
Inventor 赵月昌贾长征郝祥赵秀娟倪萍杨筱琼
Owner 上海华明高纳稀土新材料有限公司
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