Preparation method of cerium-zirconium based solid solution

A solid solution, cerium zirconium technology, which is applied in the preparation of automobile exhaust gas purification catalytic materials and the preparation of cerium zirconium-based solid solutions, can solve problems such as unfavorable industrial production and need high-pressure equipment, achieve uniform particle size, solve agglomeration, heat good stability

Active Publication Date: 2015-04-08
方复(上海)新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned preparation method requires high-pressure equipm...

Method used

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  • Preparation method of cerium-zirconium based solid solution
  • Preparation method of cerium-zirconium based solid solution
  • Preparation method of cerium-zirconium based solid solution

Examples

Experimental program
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Embodiment 1

[0038] Example 1 A preparation method of cerium-zirconium-based solid solution

[0039] A preparation method of a cerium-zirconium-based solid solution, which is carried out in accordance with the following sequence of steps:

[0040] (1) Ce 4+ Preparation: Dissolve 105kg of cerium nitrate and mix it with 315kg of water, heat to 70°C, under stirring conditions, use 10% ammonia water to precipitate to pH 5, add 63kg hydrogen peroxide with a mass concentration of 30%, and then continue to use ammonia water Precipitate until the pH is 9.0, boil and keep warm for 2.0h; after plate and frame pressure filtration, 160kg of cerium hydroxide wet cake (the total amount of rare earth is 25%) is obtained; 160kg of cerium hydroxide wet cake is beaten with 800kg of pure water, and the pH is adjusted with nitric acid 1.5, after standing for 3h, vacuum filtration, Ce +4 The clarified solution A;

[0041] (2) Preparation of active component solution: in Ce 4+ Add 15.7kg lanthanum nitrate, ...

Embodiment 2-6

[0046] Embodiment 2-6 Preparation method of cerium-zirconium-based solid solution

[0047] Examples 2-6 are respectively a preparation method of a cerium-zirconium-based solid solution, which is similar to that of Example 1, except that the technical parameters involved are different, as shown in the following table:

[0048]

[0049]

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Abstract

The invention discloses a preparation method of a cerium-zirconium based solid solution. The preparation method comprises the following sequential steps: (1) preparation of Ce<4+>; (2) preparation of active ingredient solution; (3) precipitation reaction; (4) surface modification; (5) roasting. The Ce<4+> is prepared firstly and then mixed with other rare earth ions and positively quadrivalent zirconium ions to obtain a mixed metal nitrate solution; as the mixed metal nitrate solution contains an organic complexing agent, the precipitation speed in the precipitation reaction process is controlled by virtue of complexing coordination of the organic complexing agent and the rare earth and zirconium ions, so that a precursor uniform and stable in particle size is obtained; the surface treatment is performed on the precipitate precursor by use of polyacrylic acid, and therefore, the agglomeration problem of particles in the roasting process is solved, and the pore diameter and the pore volume of the roasted product are increased, and consequently, the cerium-zirconium based solid solution catalytic material excellent in heat stability is obtained. The preparation method is suitable for the preparation of the solid solutions.

Description

technical field [0001] The invention belongs to the field of catalysts, and relates to a method for preparing a catalytic material for purifying motor vehicle exhaust, in particular to a method for preparing a cerium-zirconium-based solid solution. 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 automobile exhaust purification catalysts is to reduce the content of three toxic gases HC, CO and NOx in exhaust gas through three-way catalyti...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J35/10
Inventor 赵月昌高玮蒙素玲郝祥
Owner 方复(上海)新材料科技有限公司
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