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Ce-Zr-Al-based composite oxide rare earth 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 rare earth oxygen storage materials and its preparation, can solve the problem of poor high-temperature aging resistance of materials, affecting the catalytic activity and high-temperature thermal stability of oxygen storage materials, Issues affecting the uniformity of coating, such as the adhesion between the coating layer and the carrier

Inactive Publication Date: 2013-05-08
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

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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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  • Ce-Zr-Al-based composite oxide rare earth oxygen-storage material and preparation method thereof

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preparation example Construction

[0048] The preparation method of the cerium-zirconium-aluminum-based composite oxide rare earth oxygen storage material of the present invention comprises the following steps:

[0049] (1) Preparation of aluminum sol, mixing alumina raw material with water, adding nitric acid to adjust the pH to 2-3, shearing dispersion, high-energy ball milling, to form transparent aluminum sol A;

[0050] (2) the preparation of mixed metal salt solution, according to material composition, determine the content of cerium oxide, zirconium oxide and other rare earth oxides except cerium, convert into the weight content of corresponding nitrate or carbonate, then Cerium nitrate, soluble nitrates of rare earths other than cerium and zirconium nitrate are dissolved in water to obtain mixed metal nitrate solution B;

[0051] (3) Preparation of the active component precursor, according to the composition of the material, the aluminum sol A and the mixed metal nitrate solution B are mixed to obtain t...

Embodiment 1

[0061] 5kg of γ-Al 2 o 3 Add 140kg of water, adjust the pH to 2 with nitric acid, and obtain transparent sol A through shear dispersion and high-energy ball milling; dissolve 57kg of zirconium oxycarbonate and 3.5kg of yttrium oxide with nitric acid, add 14.25kg of lanthanum nitrate, 172kg of cerium nitrate, and 2000kg water, a clear and transparent solution B was obtained. Mix solutions B and A, heat to 60°C, slowly add ammonia water, control the pH at the end point to 9, add 24 kg of hydrogen peroxide, and keep warm for 3 hours. After the sediment was centrifuged and dehydrated, it was mixed with water at a mass ratio of 2:1, and 30 kg of lauric acid was added for shear dispersion. The dispersed turbid liquid was calcined at 450° C. for 8 hours to obtain the cerium-zirconium-aluminum-based rare earth oxygen storage material.

[0062] Among them, 63.7% of cerium oxide, 22.8% of zirconia, 5% of aluminum oxide, 3.5% of yttrium oxide, and 5% of lanthanum oxide.

Embodiment 2

[0064] Put 70kg of macroporous pseudo-boehmite into 700kg of water, adjust the pH to 3 with nitric acid, and obtain transparent sol A through shear dispersion and high-energy ball milling; mix 7kg of praseodymium oxide, 7kg of neodymium oxide, and 140kg of zirconium oxycarbonate with nitric acid Dissolve, add 81kg of cerium nitrate and 2000kg of water to obtain a clear and transparent solution B; mix solution B and A, heat to 90°C, slowly add a precipitant mixed with ammonia water and saturated ammonium bicarbonate solution in a mass ratio of 1:1, Control the pH at the end point to 6.5, add 11 kg of hydrogen peroxide, and keep warm for 1 hour. After the precipitate is centrifuged and dehydrated, it is mixed with water at a mass ratio of 2:1, and 50 kg of stearic acid is added for shear dispersion. The dispersed turbid liquid was calcined at 800° C. for 4 hours to obtain the cerium-zirconium-aluminum-based rare earth oxygen storage material.

[0065] Among them, 15% of cerium ...

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Abstract

The invention relates to a Ce-Zr-Al-based composite oxide rare earth oxygen-storage material and a preparation method thereof. The Ce-Zr-Al-based composite oxide rare earth oxygen-storage material is a composite oxide composed of cerium oxide, zirconium oxide, aluminum oxide and other rare earth oxides other than cerium oxide with a weight percentage of: 15-65% of cerium oxide, 12-55% of zirconium oxide, 5-50% of aluminum oxide, 4-10% of other rare earth oxides other than cerium oxide. Compared with conventional products, the interaction between alumina and Ce-Zr-based composite oxide is strengthened through the surface treatment for alumina, and the homogeneity between alumina and Ce-Zr-based composite oxide is adequately guaranteed. Through selection and compounding of a precipitant and controlling the precipitation end, the yield of the product is ensured. By adding a surface-treating agent, aperture and pore volume of the precipitate precursor are ensured to be large after firing, and high temperature aging resistance of the material is improved.

Description

technical field [0001] The invention relates to a rare earth oxygen storage material and a preparation method thereof, in particular to a cerium-zirconium-aluminum-based composite oxide rare earth oxygen storage material used for exhaust gas purification or catalytic combustion such as automobile exhaust purification, organic waste gas elimination, and natural gas catalytic combustion, and its preparation method. 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 for a long time to come. [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 ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J35/10B01D53/94B01D53/86B01D53/72
Inventor 赵月昌杨筱琼高玮蒙素玲赵秀娟李冉
Owner 上海华明高纳稀土新材料有限公司
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