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

A composite oxide and high specific surface technology, which is applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, etc., can solve problems such as complex processes and expensive manufacturing costs, and achieve The effect of simplifying the preparation process, low cost, and easy industrial operation

Active Publication Date: 2007-05-16
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

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Embodiment 1

[0042] By composition Ce 0.24 Zr 0.68 La 0.08 Na z o w Take cerium, zirconium, and lanthanum liquids (total molar number of ions: 1 mol) and mix them, add 0.02 g of sodium nitrate, mix well and then add them to 6M ammonia water. In the kettle, hydrothermal reaction was carried out at 160°C for 5 hours, and the reaction pressure was 0.8Mpa. The product was cooled, filtered, generally dried at 110°C, and calcined at 600°C to obtain 133.8 grams of cerium-zirconium composite oxide solid solution with a sodium oxide content of 200ppm. Fresh specific surface (600°C, 3 hours) is 108.17m 2 / g, 950℃, after 2 hours of aging, the specific surface is 36.16m 2 / g, 1050℃, after 2 hours of aging, the specific surface is 23.38m 2 / g.

Embodiment 2

[0044] By composition Ce 0.67 Zr 0.21 La 0.12 Na z o w Take cerium, zirconium, and lanthanum liquids (total mole number of ions: 1 mol) and mix them, then add 0.02 g of sodium nitrate, mix well, add them to 6M ammonia water, stir and precipitate the suspension to a pH value of 10, and filter. The filter cake was washed twice with twice the weight of ethanol each time, vacuum-dried at 110° C., and calcined at 600° C. to obtain 150.8 grams of cerium-zirconium composite oxide solid solution with a sodium oxide content of 200 ppm. Fresh specific surface (600°C, 3 hours) is 88.52m 2 / g, 950℃, after 2 hours of aging, the specific surface is 24.56m 2 / g, 1050℃, after 2 hours of aging, the specific surface is 10.16m 2 / g.

Embodiment 3

[0046] By composition Ce 0.24 Zr 0.68 La 0.08 Na z o w Take cerium, zirconium, and lanthanum liquids (total molar number of ions is 1 mol) and mix them, add 0.20 g of sodium nitrate, mix well and add them to 6M ammonia water. After stirring and sedimenting, the pH value of the suspension is 10. In the reaction kettle, hydrothermal reaction was carried out at 160°C for 5 hours, and the reaction pressure was 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 1000ppm. Fresh specific surface (600°C, 3 hours) is 100.13m 2 / g, 950℃, after 2 hours of aging, the specific surface is 32.27m 2 / g, 1050℃, after 2 hours of aging, the specific surface area is 18.35m 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 waste gas purification or catalytic combustion catalysts or catalyst carrier materials, such as automobile exhaust purification, organic waste gas elimination and natural gas catalytic combustion, etc. Can be used as fuel cell solid electrolyte or ceramic additive. Background technique [0002] Automobile exhaust has become a major public hazard. With the further stringent emission standards at home and abroad, higher and higher requirements are put forward for automobile exhaust catalysts. High specific surface cerium-zirconium composite oxide solid solution, as a good catalyst aid for automobile exhaust purification, has become an irreplaceable key material for automobile exhaust purification catalysts. As automobiles are mobile pollution sources, the components and properties ...

Claims

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Application Information

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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
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