Process for preparing Ce-Zr based composite oxide

A composite oxide, cerium zirconium technology, applied in chemical instruments and methods, zirconia, separation methods, etc., can solve problems such as high production cost, pollution, and waste gas generation, and achieve high oxygen absorption and release capacity and low cost. Effect

Inactive Publication Date: 2002-09-18
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method has high production cost and produces waste gas, causing pollution
[0011] The cerium-zirconium composite oxide prepared by the sol-gel method (Molecular Catalysis, 2000, 14:81) is simple, but the specific surface area of ​​the cerium-zirconium composite oxide is small

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] This example illustrates that the general formula is Ce 0.5 Zr 0.5 o 2 Preparation of mixed oxides.

[0018] to produce 30g Ce 0.5 Zr 0.5 o 2 Solid solution as the basis. (1) Take 44gCe(NO 3 ) 3 6H 2 o, 44g Zr(NO 3 ) 4 5H 2 o make solution (I) with 490ml deionized water; Get 635ml, 0.4mol / l NH 4 HCO 3 Solution (II). The solution (I) is dripped into the solution (II). During the dropping process, the pH value is continuously reduced. After the solution (I) is dripped, the ammonia solution is added dropwise, and the pH is kept at 4 ± 0.5 range; At this time, a white flocculent precipitate is formed, and the precipitate is stirred at room temperature for 4 hours; (2) The solution is statically precipitated overnight, and then the solution is dried in static air at 60°C, and roasted at 500°C for 2 hours to obtain product. The product is a single cerium-zirconium composite oxide solid solution with a specific surface area of ​​47m 2 / g, the oxygen storage cap...

Embodiment 2

[0020] Illustrate with examples that the general formula is Ce 0.495 Zr 0.495 PR 0.01 o 2 Preparation of mixed oxides.

[0021] 43.6g Ce(NO 3 ) 3 6H 2 o, 43.1gZr(NO 3 ) 4 5H 2 o, 0.35gPr 6 o 11 Make solution (I) with 507ml deionized water. Take 627ml 0.4mol / l NH 4 HCO 3 The solution was made into solution (II). The solution (I) is dripped into the solution (II), and during the dropping process, the pH value is continuously reduced. After the solution (I) is dripped, the ammonia solution is added dropwise, and the pH is kept in the range of 5 ± 0.5; A white flocculent precipitate is formed, and the precipitate is stirred at room temperature for 2 hours; (2) The solution is statically precipitated overnight, and then the solution is dried in static air at 60°C, and roasted at 500°C for 2 hours to obtain the product. Subsequent operating steps are the same as in Example 1. The product is a single cerium-zirconium-based composite oxide solid solution with a specifi...

Embodiment 3

[0023] Illustrate with examples that the general formula is Ce 0.45 Zr 0.45 PR 0.1 o 2 Preparation of mixed oxides.

[0024] 39g Ce(NO 3 ) 3 6H 2 o, 38.6gZr(NO 3 ) 4 5H 2 o, 3.4gPr 6 o 11 and 499ml deionized water to make solution (V). Take 562ml 0.4mol / l NH 4 HCO 3 The solution was made into solution (VI). The solution (V) is dripped into the solution (VI), and during the dropping process, the pH value is continuously reduced. After the solution (I) is dripped, the ammonia solution is added dropwise, and the pH is kept at 3 ± 0.5; A white flocculent precipitate is formed, and the precipitate is stirred at room temperature for 3 hours; (2) The solution is statically precipitated overnight, then the solution is dried in static air at 60°C, and roasted at 500°C for 2 hours to obtain the product. Subsequent operating steps are the same as in Example 1. The product is a single cerium-zirconium-based composite oxide solid solution with a specific surface area of ​​4...

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Abstract

A composite Ce-Zr based oxide is preparedf rom nitrate through precipitation by using ammonium bicarbonate as precipitant, chemical reaction, drying and calcine. It can be used as co-catalyst with high power to absorb and release oxygen. Its advantages are high specific surface are and high oxygen bearing power.

Description

Technical field: [0001] The invention relates to a method for preparing a cerium-zirconium-based composite oxide of cerium oxide and zirconium oxide with high specific surface area and high oxygen storage capacity. Its preparation method uses nitrate as raw material, and is prepared through precipitation, drying, roasting and other processes. Background technique: [0002] In the treatment of automobile exhaust gas, the currently used three-way catalyst is a multi-component composite catalyst. The three-way catalyst can convert carbon monoxide, hydrocarbons and nitrogen oxides from automobile exhaust. Simultaneous purification, in which the purification of carbon monoxide and hydrocarbons is achieved through oxidation reactions and nitrogen oxides are achieved through reduction reactions, which requires the catalyst to have better oxygen storage and oxygen release capabilities. The cerium and zirconium composite oxides (may contain a small amount of other components) in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/34B01J23/10C01F17/00C01G25/02C04B35/48C04B35/488
Inventor 刘源张磊白雪郝东升
Owner INNER MONGOLIA UNIV OF TECH
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