Rare earth zirconium-based composite oxide with core-shell structure, and preparation method and application thereof

A technology of composite oxides and rare earth oxides, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, separation methods, etc., can solve problems such as high energy consumption, complicated process, and expensive manufacturing cost , to achieve good oxygen storage capacity, avoid ammonia nitrogen wastewater, and excellent performance

Active Publication Date: 2013-07-03
GRIREM ADVANCED MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the process is complicated, the energy consu...

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  • Rare earth zirconium-based composite oxide with core-shell structure, and preparation method and application thereof
  • Rare earth zirconium-based composite oxide with core-shell structure, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0056] Weigh cerium chloride and zirconium oxychloride crystals according to the molar ratio of rare earth and zirconium being 9:1, prepare chloride solutions respectively, the molar concentrations of the two are 0.9M and 0.1M respectively, and the volumes are 10L each, and the prepared 50L sulfuric acid Ammonium solution and 1wt% hexamethylenetetramine are used as the base liquid, the amount of ammonium sulfate is 1.02 times the theoretical amount required for double salt precipitation, heated to 60 °C, and under stirring, 2L of the rare earth salt solution is first mixed with 0.5 L / min was added to the ammonium sulfate bottom solution, and then the remaining rare earth salt solution and zirconium salt solution were mixed to form a mixed solution, and the flow rate was controlled to 1.0L / min, and aged to form a core-shell structure of double salt precipitation.

[0057] After clarification, washing and filtration, the double salt precipitate was obtained, and 1.05 times the am...

Embodiment 2

[0060] Weigh rare earth chloride (70mol% Ce+25mol%La+5%molY) and zirconium oxychloride crystals according to the molar ratio of rare earth and zirconium being 1:9, and prepare chloride solutions respectively, and the molar concentrations of the two are respectively 0.1M and 0.9M, each volume 10L, the prepared 50L ammonium sulfate and hydrazine hydrate accounting for 0.1wt% of rare earth zirconium-based oxides are used as the bottom liquid, the amount of ammonium sulfate is 3 times the theoretical amount required for double salt precipitation, and heated to 60 ℃, under stirring, first add 2 L of rare earth salt solution into the ammonium sulfate base solution at 0.5 L / min, then make the remaining rare earth salt solution and zirconium salt solution into a mixed solution, add it at a controlled flow rate of 1.0 L / min, and age Formation of double salt precipitation with a core-shell structure.

[0061] After clarification, washing and filtering, the double salt precipitate was ob...

Embodiment 3

[0064] Weigh rare earth chloride (85mol% Ce+5mol%La+5mol%Nd+5mol%Pr) and zirconium oxychloride crystals according to the molar ratio of rare earth and zirconium being 2.5:7.5, prepare chloride solutions respectively, and the molar concentrations of the two are respectively 0.25M and 0.75M, each 10L in volume, the prepared 50L sodium sulfate solution and polyvinyl alcohol accounting for 0.2wt% of rare earth zirconium-based oxides are used as the bottom liquid, and the amount of sodium sulfate is the theoretical amount required for double salt precipitation. 1.2 times, heated to 90°C, under stirring, first add 2L of rare earth salt solution into the ammonium sulfate base solution at 0.5L / min, then make the remaining rare earth salt solution and zirconium salt solution into a mixed solution, control the flow rate of 1.0 Add L / min, age, and form a double salt precipitation with a core-shell structure.

[0065]After clarification, washing and filtering, the double salt precipitate ...

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Abstract

The invention relates to a rare earth zirconium-based composite oxide with a core-shell structure and a preparation method and application thereof. The rare earth zirconium-based composite oxide comprises, 5 to 95 mol% of a rare earth oxide and 95 to 5 mol% of a zirconium oxide; the rare earth zirconium-based composite oxide has a core-shell structure, and a difference between the content of the rare earth oxide in an internal layer and the content of the rare earth oxide in an external layer is more than 10% (relative content). The rare earth zirconium-based composite oxide with high temperature stability prepared by using the method provided in the invention has the advantages of low cost, high product quality and a specific surface area of more than 40 m<2>/g after ageing for 4 h at a temperature of 1000 DEG C and can be extensively used in fields like rare earth catalytic additives, oxygen storage materials, oxygen conduction materials, ceramic powder materials and oxygen sensors. The preparation method provided by the invention has the advantages of a wide source of the raw materials rare earth and zirconium, easiness, small investment for desired equipment, low preparation cost and good development and application prospects.

Description

technical field [0001] The invention relates to a rare earth zirconium-based composite oxide with a core-shell structure and a preparation method and application thereof, belonging to the technical field of rare earth materials. Background technique [0002] Motor vehicle exhaust has become the main source of urban air pollution. With the gradual tightening of automobile exhaust emission standards, high-performance automobile exhaust catalysts need further high-temperature stable cerium-zirconium composite oxide additive materials. The cerium-zirconium additive acts as an oxygen buffer, which has the functions of oxygen storage and oxygen release, effectively widens the operating window of the air-fuel ratio of the three-way catalyst, and improves the purification effect of the catalyst. In catalysts, a high specific surface is usually very necessary, and the specific surface of cerium oxide will be greatly reduced under the high temperature of automobile exhaust. The addi...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01D53/94C04B35/48C04B35/50
Inventor 龙志奇黄小卫崔梅生崔大立王良士于瀛张娜冯宗玉
Owner GRIREM ADVANCED MATERIALS CO LTD
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