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

An oxygen storage material, solid solution technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as the need for high-pressure equipment and unfavorable industrial production

Active Publication Date: 2015-03-25
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

[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 includes the following steps:

[0034] (1) Preparation of mixed metal nitrate solution: Determine the content of cerium oxide, zirconium oxide and other rare earth oxides except cerium according to the composition of the material and the weight of the target product, and convert it into the weight content of the corresponding raw materials. Cerium nitrate, other rare earth soluble nitrates except 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 the precursor of the cerium-zirconium-based solid solution rare earth oxygen storage material: use 36% industrial ammonia water and pure water 1:1 mixed precipitant, slowly add to the 50-70 ℃ mixed metal nitrate solution, to pH is 3-4, add Ce 3+ / Ce 4+ Convert 1.2-1.5 times the stoichiometric amount o...

Embodiment 1

[0046] 70g cerium nitrate, 20g zirconium nitrate, 5g lanthanum nitrate, 5g yttrium nitrate are dissolved in 1900g deionized water, 5g acetic acid is added, and heated to 50°C to obtain a mixed metal nitrate solution; the industrial ammonia water and pure water have a mass ratio of 1:1 Mix to obtain the precipitant, slowly add the precipitant to the mixed metal nitrate solution, until the pH value is 3, add 11.6g of hydrogen peroxide, continue to add the precipitant to the pH value of 9, keep for 5h; wash, dehydration; after dehydration 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 area of ​​the cerium-zirconium-based solid solution rare earth oxygen storage material is 100.55m 2 ·G -1 , The particle size is 90nm, see XRD diagram fi...

Embodiment 2

[0049] 21g cerium nitrate, 133g zirconium nitrate, 5.5g neodymium nitrate, 1.5g yttrium nitrate dissolved in 1900g deionized water, add 32g citric acid, and heat to 70℃ to obtain a mixed metal nitrate solution; compare industrial ammonia water to pure water by mass Mix 1:1 to obtain a precipitant, slowly add the precipitant to obtain a mixed metal nitrate solution until the pH is 3, add 4.4g of hydrogen peroxide, continue to add the precipitant to a pH of 9, keep for 2h; wash and dehydrate; The dehydrated cerium-zirconium-based solid solution rare earth oxygen storage material precursor and 30 g of alkenyl succinic anhydride are 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 area of ​​the cerium-zirconium-based solid solution rare earth oxygen storage material is 120.18 m 2 ·G -1 , Take the cerium-zirconium-based solid solution rare earth oxygen storage mater...

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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 of automobile exhaust gas purification, organic exhaust gas elimination and natural gas catalytic combustion, and a preparation method thereof . Background technique [0002] Reducing automobile 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 environmental protection in my country at present and for a long time in the future. [0003] In order to reduce pollution, breakthroughs must be made in three aspects: improving gasoline quality, improving engine combustion, and increasing exhaust gas purification catalytic efficiency. So far, the most effective way to use automobile e...

Claims

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Application Information

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Patent Type & Authority Patents(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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