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Cerium-zirconium-based solid solution rare earth oxygen-storage material and preparation method thereof

A technology of oxygen storage material and solid solution, which is applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc. It can solve the problems of high-voltage equipment and unfavorable industrial production.

Active Publication Date: 2013-06-05
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

[0010] The above preparation method requires high-pressure equipment through hydrothermal treatment, which is not conducive to industrial production

Method used

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  • Cerium-zirconium-based solid solution rare earth oxygen-storage material and preparation method thereof

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preparation example Construction

[0033] The preparation method of the cerium-zirconium-based solid solution rare earth oxygen storage material of the present invention comprises the following steps:

[0034] (1) The preparation of mixed metal nitrate solution: according to the weight of material composition and target product, determine the content of cerium oxide, zirconium oxide and other rare earth oxides except cerium, convert into the weight content of corresponding raw material, will Cerium nitrate, soluble nitrates of rare earths other than cerium and zirconium nitrate are dissolved in water, and a certain organic acid is added to obtain a mixed metal nitrate solution;

[0035] (2) Preparation of cerium-zirconium-based solid solution rare earth oxygen storage material precursor: use 36% industrial ammonia and pure water as a precipitant mixed 1:1, slowly add it to the mixed metal nitrate solution at 50-70 ° C, until pH 3-4, add Ce 3+ / C 4+ Convert hydrogen peroxide that is 1.2-1.5 times the stoichiom...

Embodiment 1

[0046] Dissolve 70g of cerium nitrate, 20g of zirconium nitrate, 5g of lanthanum nitrate, and 5g of yttrium nitrate in 1900g of deionized water, add 5g of acetic acid, and heat to 50°C to obtain a mixed metal nitrate solution; mix industrial ammonia and pure water in a mass ratio of 1:1 Mix to obtain a precipitating agent, slowly add the precipitating agent to obtain a mixed metal nitrate solution until the pH value is 3, add 11.6g of hydrogen peroxide, continue to add the precipitating agent until the pH value is 9, and keep warm for 5 hours; wash and dehydrate; The cerium-zirconium-based solid solution rare earth oxygen storage material precursor was mixed with 11 g of lauric acid, sheared and dispersed, and calcined at 600° C. for 4 hours to obtain the cerium-zirconium-based solid solution rare earth oxygen storage material.

[0047] The specific surface of the cerium-zirconium-based solid solution rare earth oxygen storage material is 100.55m 2 g -1 , the particle size is...

Embodiment 2

[0049] Dissolve 21g of cerium nitrate, 133g of zirconium nitrate, 5.5g of neodymium nitrate, and 1.5g of yttrium nitrate in 1900g of deionized water, add 32g of citric acid, and heat to 70°C to obtain a mixed metal nitrate solution; Mix 1:1 to obtain a precipitating agent, slowly add the precipitating agent to obtain a mixed metal nitrate solution until the pH value is 3, add 4.4 g of hydrogen peroxide, continue to add the precipitating agent until the pH value is 9, and keep warm for 2 hours; washing and dehydration; The dehydrated cerium-zirconium-based solid solution rare earth oxygen storage material precursor and 30 g of alkenyl succinic anhydride were shear-dispersed and calcined at 450° C. for 8 hours to obtain the cerium-zirconium-based solid solution rare earth oxygen storage material.

[0050] The specific surface of the cerium-zirconium-based solid solution rare earth oxygen storage material is 120.18m 2 g -1 , after calcination at 1000℃ for 4h, the specific surfac...

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Abstract

The invention discloses a cerium-zirconium-based solid solution rare earth oxygen-storage material and a preparation method thereof. The cerium-zirconium-based solid solution rare earth oxygen-storage material has a specific surface area equal to or greater than 90m<2>.g<-1>, has a specific surface area equal to or greater than 30m<2>.g<-1> after being calcined at a temperature of 1000 DEG C for 4 hours, and has a specific surface area equal to or greater than 20m<2>.g<-1> after being calcined at a temperature of 1050 DEG C for 12 hours. Compared with the prior art, the preparation method has the advantages that before precipitation, a mixed metal salt solution is added with a certain amount of an organic acid so that acidity of the mixed metal salt solution is improved or the mixed metal salt solution forms sol; a reaction rate is inhibited and a precipitation rate is controlled so that a stable precursor having the uniform grain size is obtained; and the precipitate precursor surface treatment is carried out by a surfactant so that the aperture size and the aperture volume of a calcination product are improved and the cerium-zirconium-based solid solution rare earth oxygen-storage material having good heat stability is prepared. The cerium-zirconium-based solid solution rare earth oxygen-storage material has the advantages of small granule size, large specific surface area, high temperature aging resistance and high activity.

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-based solid solution 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 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...

Claims

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Application Information

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