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Cerium oxide-zirconium oxide-based composite oxide and preparation method thereof

A composite oxide, zirconia-based technology, applied in catalyst activation/preparation, chemical instruments and methods, separation methods, etc., can solve the problems of reduced specific surface area and low OSC value of cerium-zirconium composite oxides, and achieve excellent dispersion , the effect of high oxygen storage performance

Active Publication Date: 2012-06-27
方复(上海)新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is an obvious defect in this patent. The specific surface area of ​​the synthesized cerium-zirconium composite oxide decreases rapidly after aging, resulting in a relatively low OSC value.

Method used

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  • Cerium oxide-zirconium oxide-based composite oxide and preparation method thereof
  • Cerium oxide-zirconium oxide-based composite oxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take by weighing 70g ceria, be dissolved completely by the nitric acid of 65wt% by concentration; Take by weighing 348g zirconium nitrate (Zr(NO 3 ) 4 ·5H 2 O, corresponding to 100g ZrO 2 ), add 1000mL deionized water to dissolve completely; weigh 126g Ce(NO 3 ) 3 ·6H 2 O (corresponding to ceria content of 50g), add 500mL deionized water to dissolve; after stirring and mixing the three solutions prepared above, the Ce-containing 3+ with Ce 4+ A mixed solution of cerium and zirconium with a ratio of about 40:60;

[0036] Add sodium hydroxide solution (concentration is 10wt%) in gained cerium-zirconium mixed solution, stir gained mixed solution vigorously simultaneously, when solution pH reaches about 6, suspend adding alkali, this moment in solution Ce 4+ and Zr 4+ All have basically completely precipitated into cerium hydroxide (wherein cerium mainly exists in the form of +4 valence) and zirconium hydroxide, and the mixed turbid solution of cerium hydroxide and ...

Embodiment 2

[0039] Take by weighing 140g ceria, be dissolved completely by the sulfuric acid of 40wt% by concentration; Take by weighing 432.9g zirconium sulfate (Zr(SO 4 ) 2 4H 2 O, corresponding to 150g ZrO 2 ), add 1000mL deionized water to dissolve completely; weigh 124.2g Ce 2 (SO 4 ) 3 ·8H 2 O (corresponding to ceria content of 60g), add 600mL deionized water to dissolve; after stirring and mixing the three solutions prepared above, the Ce-containing 3+ with Ce 4+ The ratio is a 30:70 mixed solution of cerium and zirconium;

[0040] Slowly add ammonia solution (concentration is 30wt%) in the obtained cerium-zirconium mixed solution, while vigorously stirring the gained mixed solution, when the solution pH reaches about 6.5, suspend adding alkali, this moment in the solution Ce 4+ and Zr 4+ All have basically completely precipitated into cerium hydroxide (wherein cerium mainly exists in the form of +4 valence) and zirconium hydroxide, and the mixed turbid solution of cerium ...

Embodiment 3

[0043] Take by weighing 80g ceria, be that the nitric acid of 65wt% is dissolved completely by concentration; Take by weighing 348g zirconium nitrate (Zr(NO 3 ) 4 ·5H 2 O, corresponding to 100g ZrO 2 ), add 1000mL deionized water to dissolve completely; weigh 50.4g Ce(NO 3 ) 3 ·6H 2 O (corresponding to cerium oxide content of 20g), add 200mL deionized water to dissolve, then weigh 368g Al(NO 3 ) 3 9H 2 O (corresponding to Al 2 o 3 content of 50g) was dissolved in 500mL deionized water; after stirring and mixing the four solutions prepared above, the Ce-containing 3+ with Ce 4+ A mixed solution of cerium, zirconium and aluminum in a ratio of 20:80;

[0044] Slowly add sodium hydroxide solution (concentration is 10wt%) in the obtained cerium-zirconium-aluminum mixed solution, stir the gained mixed solution simultaneously, when solution pH reaches about 6, suspend adding alkali, this moment in the solution Ce 4+ and Zr 4+ All have basically completely precipitated in...

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Abstract

The invention provides a cerium oxide-zirconium oxide-based composite oxide and a preparation method of the cerium oxide-zirconium oxide-based composite oxide. The cerium oxide-zirconium oxide-based composite oxide is a mixture of CeO2 and ZrO2, wherein the mass ratio between the CeO2 and the ZrO2 is 45:55-70:30. Ce3+ and Ce4+ formation potential of hydrogen (pH) values of hydroxide precipitationis different ,firstly, mixing Ce4+ and Zr4+ in the mixed solution in a way of coprecipitation, and then precipitating Ce3+; and the solid solution of cerium zirconium and the composition of cerium oxide on the surface of the solid solution of the cerium zirconium can be simultaneously realized by high-temperature roasting. The cerium oxide-zirconium oxide-based composite oxide has excellent dispersive action for precious metal platinum and high oxygen storage capacity (OSC), and thus can be applied to catalyst promoter or catalyst carrier of automobile exhaust three-way catalyst (TWC).

Description

technical field [0001] The invention relates to a cerium oxide-zirconia based composite oxide and a preparation method thereof. Background technique [0002] Ce specific to cerium ions in cerium oxide 3+ / C 4+ The oxidation-reduction cycle makes it an important component of the three-way catalyst for automobile exhaust purification. In depleted oxygen, CeO 2 Oxygen is evolved to provide CO and CH x Oxygen required for the oxidation of compounds; in oxygen-rich conditions, CeO 2 Store oxygen to ensure NO x by CO and CH x reduction. However, pure CeO 2 This reversible redox reaction mainly occurs on the surface, and its corresponding oxygen storage capacity (OSC) performance is extremely low, which is difficult to meet the needs of practical applications. [0003] In recent years, the research around improving the OSC of ceria has received widespread attention, among which the research on the formation of cerium and zirconium oxide solid solution by doping zirconia in...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J37/03B01J32/00B01D53/94
CPCY02T10/22Y02A50/20Y02T10/12
Inventor 尹先升赵月昌杨筱琼赵秀娟陈曦蒙素玲
Owner 方复(上海)新材料科技有限公司
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