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Solid solution composition of cerium zirconium compound oxide with high specific surface and method for preparing the same

A composite oxide, high specific surface technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, etc. Simplified preparation process, low cost, significant economic and social benefits

Active Publication Date: 2009-05-20
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the process is complicated and the manufacturing cost is expensive

Method used

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  • Solid solution composition of cerium zirconium compound oxide with high specific surface and method for preparing the same
  • Solid solution composition of cerium zirconium compound oxide with high specific surface and method for preparing the same

Examples

Experimental program
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Embodiment 1

[0041] By composition Ce 0.24 Zr 0.68 La 0.08 Na z O w Take the cerium, zirconium, and lanthanum solution (total moles of ions: 1 mol) and mix, add 0.02 g of sodium nitrate, mix well and add to the 6M ammonia solution, stir and precipitate the suspension pH value of 10, and put the suspension into the high-pressure reaction In the kettle, a hydrothermal reaction was carried out at 160°C for 5 hours at a reaction pressure of 0.8Mpa. The product was cooled, filtered, dried at 110°C, and calcined at 600°C to obtain 133.8g of a cerium-zirconium composite oxide solid solution with a sodium oxide content of 200ppm. The fresh specific surface (600℃, 3 hours) is 108.17m 2 / g, 950℃, the specific surface area is 36.16m after 2 hours of aging 2 / g, 1050℃, the specific surface area is 23.38m after 2 hours of aging 2 / g.

Embodiment 2

[0043] By composition Ce 0.67 Zr 0.21 La 0.12 Na z O w After taking the cerium, zirconium, and lanthanum solutions (total moles of ions: 1 mol) and mixing, add 0.02 g of sodium nitrate, and after mixing uniformly, add to 6M ammonia solution, stir and precipitate the suspension pH value of 10, and filter. The filter cake was washed twice with 2 times the weight of ethanol each time, vacuum dried at 110°C, and calcined at 600°C to obtain 150.8 grams of a cerium-zirconium composite oxide solid solution with a sodium oxide content of 200 ppm. Fresh specific surface (600℃, 3 hours) is 88.52m 2 / g, 950℃, the specific surface area is 24.56m after 2 hours of aging 2 / g, 1050℃, the specific surface area is 10.16m after 2 hours of aging 2 / g.

Embodiment 3

[0045] By composition Ce 0.24 Zr 0.68 La 0.08 Na z O w Take the cerium, zirconium, and lanthanum solution (total moles of ions: 1 mol) and mix, add 0.20 g of sodium nitrate, mix well and add to the 6M ammonia solution, stir and precipitate the suspension pH value of 10, and put the suspension into high pressure In the reactor, hydrothermally reacted at 160°C for 5 hours at a reaction pressure of 0.8Mpa. The product was cooled, filtered, dried at 110°C, and calcined at 600°C to obtain 132.5 grams of cerium-zirconium composite oxide solid solution with a sodium oxide content of 1000 ppm. Fresh specific surface (600℃, 3 hours) is 100.13m 2 / g, 950℃, the specific surface area is 32.27m after 2 hours of aging 2 / g, 1050℃, the specific surface area is 18.35m after 2 hours of aging 2 / g.

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Abstract

The invention relates to a high-specific area cerium zirconium oxide solid compound and relative production, wherein said compound is Ce1-xZrxNazOw or Cex'Zrx'MyNazOw, while the natron sodium oxide content is 5ppm-1000ppm. And the production comprises (1), preparing the solution as A; (2), dissolving the alkali material into water to obtain B; (3), adding A into B, to obtain deposition suspension; (4), adding additive, as surface activator, polymer, etc, mixing and heating, and crystallizing at high pressure; (5), filtering, and washing the deposit; (6), washing and filtering, drying, baking to obtain the solid. The invention has high crystallization degree, small grain and uniform distribution.

Description

Technical field [0001] The invention relates to a high specific surface cerium-zirconium composite oxide solid solution composition and a preparation method thereof. Such materials can be used for exhaust gas purification or catalytic combustion catalysts or catalyst carrier materials, such as automobile exhaust purification, organic exhaust gas elimination and natural gas catalytic combustion, etc. It can be used as a fuel cell solid electrolyte or ceramic additive. Background technique [0002] Automobile exhaust has become a major public hazard. With the stricter domestic and foreign emission standards, higher and higher requirements are put forward on automobile exhaust catalysts. The high surface area cerium-zirconium composite oxide solid solution, as a good catalyst promoter for automobile exhaust purification, has become an irreplaceable key material for automobile exhaust purification catalysts. Since automobiles are a mobile pollution source, the components and properti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01J37/03
Inventor 崔梅生李明来朱兆武彭新林张顺利赵娜崔大立龙志奇黄小卫李红卫
Owner GRIREM ADVANCED MATERIALS CO LTD