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Composite aluminium, cerium and zirconium oxide catalytic material and method for producing same

A composite oxide and catalytic material technology, applied in the field of aluminum-cerium-zirconium composite oxide catalytic material and its preparation, can solve the problem of affecting the catalytic activity and high-temperature thermal stability of the oxygen storage material, affecting the uniformity of the coating layer and the coating layer. Problems such as carrier adhesion, poor high temperature aging resistance of materials, etc.

Active Publication Date: 2012-12-19
上海华明高纳稀土新材料有限公司
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  • Abstract
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  • Claims
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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.

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  • Composite aluminium, cerium and zirconium oxide catalytic material and method for producing same

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preparation example Construction

[0054] The preparation method of aluminum cerium zirconium composite oxide catalytic material of the present invention, it comprises the steps:

[0055] (1) Preparation of active component slurry: According to the composition of the material, dissolve the corresponding cerium nitrate, soluble salts of other rare earths except cerium and zirconium nitrate in water to obtain a mixed metal nitrate solution; in the mixed metal nitrate solution Adding activated alumina and structure directing agent, shearing and dispersing, to obtain active component slurry A;

[0056] (2) Precipitation: At a certain temperature, add ammonia water to the above-mentioned active component slurry A until the end of the precipitation, add Ce 3+ Oxidized to Ce 4+ The required stoichiometric hydrogen peroxide is kept for a certain period of time to obtain sediment B;

[0057] (3) Surface treatment of the sediment, dehydrating and washing the sediment B; repulping the dehydrated sediment B and water at ...

Embodiment 1

[0070] Dissolve 64.9kg of cerium nitrate, 29.8kg of zirconium nitrate, and 13.5kg of lanthanum nitrate in 500kg of pure water, and add 60kg of γ-Al with a pore volume of 0.31g / ml 2 o 3 , 16kg of ammonium citrate, shear dispersion; after heating the above slurry to 60°C, slowly add ammonia water, control the pH at the end point to 9, add 11.8kg of 30% hydrogen peroxide, and keep warm for 4h. After the sediment was centrifuged and dehydrated, it was mixed with water at a mass ratio of 2:1, and 32.5 kg of diethylene glycol monobutyl ether (C8H18O3) was added to shear and disperse. The dispersed turbid liquid was calcined at 550° C. for 6 hours to obtain the aluminum cerium zirconium composite oxide catalytic material.

[0071] The composition of the material is 24% of cerium oxide, 11% of zirconia, 5% of lanthanum oxide, and 60% of aluminum oxide. The material has a fresh specific surface area of ​​140m 2 / g, the specific surface area obtained after calcination of the material...

Embodiment 2

[0073] Dissolve 64.9kg of cerium nitrate, 29.8kg of zirconium nitrate, and 13.5kg of lanthanum nitrate in 500kg of pure water, and add 60kg of γ-Al with a pore volume of 0.68g / ml 2 o 3 , 16kg of ammonium citrate, shear dispersion; after heating the above slurry to 60°C, slowly add ammonia water, control the pH at the end point to 9, add 11.8kg of 30% hydrogen peroxide, and keep warm for 1h. After centrifugation and dehydration of the precipitate, it is mixed with water according to the mass ratio of 2:1, and 54.1kg of ethylene glycol monobutyl ether (C6H14O2) is added to shear and disperse. The dispersed turbid liquid was calcined at 750° C. for 4 hours to obtain the aluminum-cerium-zirconium composite oxide catalytic material.

[0074] The composition of the material is 24% of cerium oxide, 11% of zirconia, 5% of lanthanum oxide, and 60% of aluminum oxide. The material has a fresh specific surface area of ​​182m 2 / g, the specific surface area obtained after calcination of...

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Abstract

The invention aims to disclose a composite aluminium, cerium and zirconium oxide catalytic material and a method for producing the same. The composite aluminium, cerium and zirconium oxide catalytic material is a composite oxide which consists of 15-30% of cerium oxide, 5-20% of zirconium oxide, 50-75% of aluminium oxide and 0-5% of other rear earth oxides expect cerium by weight. Compared with the prior art, the aluminium oxide is subjected to surface treatment, on one hand, the interaction of the aluminium oxide and the cerium and zirconium-base composite oxides is enhanced; and on the other hand, the uniformity of the aluminium oxide and the cerium and zirconium-base composite oxides is fully ensured; through the modification of a structural directing agent and a dispersing agent, the pore diameter and pore volume of the composite aluminium, cerium and zirconium oxide catalytic material are further improved, and good temperature resistance and aging resistance are obtained; and moreover, the composite aluminium, cerium and zirconium oxide catalytic material has the advantages of high oxygen storage capability and high oxygen storage and release velocities, so the purpose of the invention is realized.

Description

technical field [0001] The invention relates to a catalytic material and a preparation method thereof, in particular to an aluminum-cerium-zirconium composite oxide catalytic material suitable for exhaust gas purification or catalytic combustion such as automobile tail gas 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 use au...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01D53/94B01D53/62B01D53/56
Inventor 赵月昌李雪云李冉贾长征赵秀娟杨筱琼
Owner 上海华明高纳稀土新材料有限公司
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