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Preparation method for high-performance ceria-zirconia nanocomposite oxide

A nanocomposite and oxide technology, which is applied in chemical instruments and methods, separation methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve complex synthesis procedures and unstable thermal stability of cerium-zirconium nanocomposite oxides. High cost, high cost and other problems, to achieve the effect of simple process, low cost and low equipment requirements

Inactive Publication Date: 2013-09-25
ZHEJIANG HAILIANG ENVIRONMENTAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for synthesizing high-performance cerium-zirconium nanocomposite oxides by co-precipitation in view of the shortcomings of existing cerium-zirconium nanocomposite oxides such as low thermal stability, complex synthesis procedures, and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Dissolve the nitrates of cerium and zirconium in water to make a solution with a certain concentration, add a certain amount of yttrium salt solution dropwise with ammonia water until the pH is 9, and ensure that the final molar ratio of cerium, zirconium and yttrium is 4:5:1 . Stir for 1h, vacuum dry at 80°C to remove water; bake at 700°C for 1h under nitrogen atmosphere, and finally bake at 400°C for 4h under air atmosphere. The specific surface area of ​​the obtained cerium-zirconium nanocomposite oxide is 140m 2 / g, the oxygen storage capacity is 310μmol / g, after aging at 1050℃ for 10h, its specific surface area is 82m 2 / g.

Embodiment 2

[0019] The difference from Example 1 is that the added elements are La and Nd, and the final molar ratio of cerium, zirconium and La+Nd is 4:5:1. Stir for 0.5h, vacuum dry at 70°C to remove water; bake at 800°C for 2h under nitrogen atmosphere, and finally bake at 500°C for 3h under air atmosphere, the specific surface area of ​​the obtained cerium-zirconium nanocomposite oxide is 130m 2 / g, the oxygen storage capacity is 330μmol / g, after aging at 1050℃ for 10h, its specific surface area is 75m 2 / g.

Embodiment 3

[0021] The difference from Example 2 is that the precipitating agent is a mixed solution of ammonia water and urea, stirred for 2 hours, and vacuum-dried at 60°C to remove water; roasted at 600°C for 1h under nitrogen atmosphere, and finally roasted at 300°C for 4h under air atmosphere, the obtained cerium-zirconium The specific surface area of ​​nanocomposite oxide is 150m 2 / g, the oxygen storage capacity is 345μmol / g, after aging at 1050℃ for 10h, its specific surface area is 88m 2 / g.

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Abstract

The invention relates to the ceria-zirconia nanocomposite oxide synthesis field, and especially relates to a preparation method for a high-performance ceria-zirconia nanocomposite oxide. The ceria-zirconia nanocomposite oxide is prepared from cerium nitrate, zirconium nitrate and soluble salts of Pr, La, Nd and Y by a coprecipitation method. Vacuum drying is used for removing water, and the high-performance ceria-zirconia nanocomposite oxide is obtained by successively roasting with nitrogen and air. The total content of CeO2 and ZrO2 is 85-95 wt%. The preparation method has the characteristics of simple process, low device requirements and low cost, and the prepared ceria-zirconia nanocomposite oxide has high stability and superior catalytic performance.

Description

Technical field: [0001] The invention relates to the field of synthesis of cerium-zirconium nano-composite oxides, in particular to a method for preparing high-performance cerium-zirconium nano-composite oxides. Background technique: [0002] With the development of transportation, the number of automobiles in the world is increasing rapidly, and China has become a big automobile country in the world. As of June 2011, the number of motor vehicles in China was 217 million, of which automobiles and motorcycles are the main components of motor vehicles. It is estimated that around 2020, the number of cars in my country will be roughly equivalent to that of the United States. While the cars fueled by petroleum products bring convenience and speed to people, they also bring unavoidable air pollution problems. [0003] The application of catalytic conversion technology is the most effective means to achieve ultra-low emissions from vehicles. In three-way catalysts (TWCs) for aut...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01D53/94
Inventor 刘雪松石磊
Owner ZHEJIANG HAILIANG ENVIRONMENTAL MATERIALS
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