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Cerium-zirconium composite oxide, preparation method of cerium-zirconium composite oxide and use of catalyst

A composite oxide, cerium zirconium technology, applied in the field of its preparation, cerium zirconium composite oxide, can solve the limitations affecting the catalytic performance, stability and consistency of catalytic application effect of cerium zirconium composite oxide, cerium zirconium composite oxide Insufficient high temperature stability and other problems, to achieve the effect of good catalytic application performance and effect, high temperature stability improvement, good temperature resistance performance

Active Publication Date: 2016-10-05
GRIREM ADVANCED MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high temperature stability of the cerium-zirconium composite oxide prepared by the prior art is still insufficient, thus affecting the catalytic performance of the cerium-zirconium composite oxide
Patent CN101096012 (B) mentions cerium oxide and zirconia-based mixed oxide, the purpose of which is to improve the dispersion of noble metal platinum, and the proportion of this mixed species of cerium oxide is 50vol% or higher, this cerium-zirconium oxide The anti-aging performance is poor, the proportion of cerium oxide is 80.6 vol% and the specific surface area is only 14.4m 2 / g
Patent CN101024513B reports a cerium-zirconium composite oxide with rod-shaped particles, but it does not explain the exact mechanism of rod-shaped particles, and the ratio of rod-shaped particles is also uncontrollable, which is consistent with the stability of product production and catalytic application effect sex is very limited

Method used

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preparation example Construction

[0034] According to another aspect of the present invention, there is provided a method for preparing a cerium-zirconium composite oxide, the preparation method comprising the following steps: Step S1, the components of the cerium-zirconium solid solution phase in the cerium-zirconium composite oxide provided according to the present invention Proportionally configure the feed solution A containing tetravalent cerium ions, zirconium ions and doped metal ions, and configure the trivalent cerium ion solution according to the proportion of the cerium oxide phase in the cerium-zirconium composite oxide, and add the trivalent cerium ion solution to the trivalent cerium ion solution Add the complex to obtain the feed liquid B, wherein the doped metal ion is M in the cerium-zirconium composite oxide, and the complex contains complex ions of cerium ions; step S2, adding the feed liquid A, the feed liquid B and the precipitant at the same time Mixing and reacting in the reactor, adjusti...

Embodiment 1

[0048] The preparation method of the cerium-zirconium composite oxide provided in this embodiment comprises the following steps:

[0049] First, the molar ratio of Ce / Zr / Nd is 35:61:4 for batching to obtain a mixed solution A (volume of 3 L) of tetravalent cerium nitrate, neodymium nitrate and zirconium oxynitrate cerium-zirconium solid solution with a concentration of 1.5M; Then configuration concentration is the trivalent cerium nitrate solution of 1.5M as cerium oxide phase raw material solution and adds and accounts for trivalent cerium ion molar weight 10% ethylenediaminetetraacetic acid to obtain feed liquid B (volume is 160ml); Next, by and Liquid A, liquid B and precipitant ammonia water were mixed and precipitated by means of flow feeding, the pH value of the reaction system was adjusted to 10, the reaction time was 3 hours, and the reaction temperature was 60°C to obtain a cerium-zirconium composite hydroxide precipitation slurry. After the precipitation slurry was a...

Embodiment 2

[0053] At first, be 35:60:5 to carry out batching by the mol ratio of Ce / Zr / La, obtain the cerium ammonium nitrate, lanthanum nitrate and zirconium oxynitrate cerium zirconium solid solution mixed solution A (volume is 3L) that concentration is 1.5M; Configuration concentration is that the cerium chloride solution of 1.5M is as cerium oxide phase raw material solution and adds and accounts for trivalent cerium ion molar weight 3% citric acid to obtain feed liquid B (volume is 100ml); Liquid A, liquid B and the precipitating agent sodium hydroxide are mixed for precipitation reaction, the pH value of the reaction system is adjusted to 9, the reaction time is 3 hours, and the reaction temperature is 60°C to obtain the cerium-zirconium composite hydroxide precipitation slurry, and the precipitation slurry Put it into a high-pressure reactor, and age it hydrothermally at 200°C for 3 hours to obtain a cerium-zirconium composite hydroxide precipitation slurry, and filter, wash, and d...

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Abstract

The invention provides a cerium-zirconium composite oxide, a preparation method of the cerium-zirconium composite oxide and a use of the catalyst. The cerium-zirconium composite oxide has a composite phase structure and comprises a cerium oxide phase and a cerium-zirconium solid solution. The cerium-zirconium solid solution has a chemical formula of CexZr1-x-yMyO2, wherein M represents one or more of rare earth elements but cerium, transition metal elements and alkali earth metals, x is in a range of 15-85mol% and y is in a range of 0-20mol%. The cerium oxide phase and the cerium-zirconium solid solution have different cell parameters so that the cerium oxide phase and the cerium-zirconium solid solution have different phase boundaries and a contact area of a sintering neck is reduced. Under action of cooperation or coupling of the cerium oxide phase and the cerium-zirconium solid solution, the cerium-zirconium composite oxide has high anti-sintering performances so that high temperature stability of the cerium-zirconium composite oxide is improved.

Description

technical field [0001] The invention relates to the technical field of cerium-zirconium composite oxides, in particular to a cerium-zirconium composite oxide, its preparation method and the application of a catalyst. Background technique [0002] As domestic and foreign industrial waste gas and motor vehicle exhaust emission standards become more and more stringent, the requirements for industrial waste gas and motor vehicle exhaust purification catalysts are also getting higher and higher. As a mobile pollution source, motor vehicles are constantly changing the components and properties of exhaust gas during operation, which makes it difficult for ordinary catalysts to effectively purify motor vehicle exhaust. Therefore, an automobile exhaust gas purification catalyst containing platinum, palladium, and rhodium precious metals has been developed. And motorcycle exhaust purification catalysts, etc., a key active coating material, cerium-zirconium composite oxide material, is...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J23/34B01J23/83B01D53/94B01D53/86B01D53/56
CPCB01J37/03B01J23/10B01D53/94B01J23/63B01J2523/00B01J23/83B01J23/34B01J37/009B01J37/0236B01J35/50B01J35/58B01J35/51B01J35/613B01J2523/3712B01J2523/48B01J2523/3725B01J2523/3706B01J2523/3718B01J2523/36B01J2523/72B01J2523/24B01J2523/17B01J2523/3756B01J2523/23B01J2523/3743B01J2523/847B01J35/23B01D53/86B01D2255/407B01J37/038B01J37/04B01J37/10
Inventor 黄小卫王琦岳梅钟强王磊侯永可崔梅生
Owner GRIREM ADVANCED MATERIALS CO LTD
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