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Cerium-zirconium composite oxide loaded with noble metal and preparation method and application of cerium-zirconium composite oxide

A technology of composite oxides and noble metals, applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, separation methods, etc., can solve the problems of difficult control of reduction efficiency, degradation of catalytic performance, and difficulty in maintaining the size of loaded particles Uniformity and other problems, to achieve the effect of improving low-temperature catalytic activity and anti-aging activity, refining precious metal particles, and good catalytic oxidation effect

Inactive Publication Date: 2020-01-17
SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have their own characteristics, but there are also common shortcomings that the noble metal particles are not easy to disperse evenly and the particle size of the loaded particles is difficult to maintain uniformity, which directly affects the light-off temperature and catalytic conversion rate of the obtained catalyst, and is easy to sinter after high-temperature aging, making it The catalytic performance is greatly reduced, and the service life of the catalyst is severely shortened
[0005] CN108579744A provides a preparation method of a cerium-zirconium-based catalyst loaded with ruthenium. The method uses sodium borohydride as a reducing agent to reduce the metal ions of the noble metal ruthenium into metal atoms supported on the surface of the catalyst, but sodium borohydride is easy to absorb moisture, and It is easy to decompose when exposed to moisture, and the reduction efficiency is not easy to control
Both CN106824187A and CN108579719A have prepared a kind of cerium-zirconium composite oxide loaded with precious metals by equal volume impregnation method, but the low-temperature catalytic effect of the catalyst prepared by the above method is not ideal

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  • Cerium-zirconium composite oxide loaded with noble metal and preparation method and application of cerium-zirconium composite oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Example 1 provides a palladium-loaded nano-cerium-zirconium composite oxide, which is prepared by the following method:

[0055] Take 768.1g of zirconium nitrate, dissolve it with 2000ml of deionized water until clear; take 24.3g of oxidation spectrum, dissolve it with 48.5g of concentrated nitric acid until clear, combine the two solutions to obtain solution A;

[0056] Take 603.5g of ammonium cerium nitrate and 63.3g of lanthanum nitrate into solution A, stir until clear, adjust the pH of solution A to 1.5 with ammonia water in a water bath at 50°C, and add 8.1g of 50% palladium chloride solution , mix evenly and set the volume to 7000ml, and introduce it into a polytetrafluoroethylene-lined pressure melting bomb, conduct a hydrothermal hydrolysis reaction at 200°C for 20 hours, adjust the pH to about 9.5 with ammonia water at room temperature, and obtain slurry B;

[0057] Transfer the slurry B to a titanium kettle, and conduct a hydrothermal reaction at 200° C. for ...

Embodiment 2-3

[0060] Embodiment 2-3 provides a palladium-loaded nano-cerium-zirconium composite oxide, and its preparation method is the above-mentioned method. The nano-cerium-zirconium composite oxide obtained in embodiment 1-3 is referred to as CZ below, and the difference is only in the embodiment The amounts of 50% palladium chloride solution added in 1-3 were 8.1g, 16.2g and 24.3g respectively, that is, the palladium loadings of Examples 1-3 were 0.5wt%, 1.0wt% and 1.5wt%, respectively. Therefore, combining the components and palladium loading, the nano-cerium-zirconium composite oxides obtained in Examples 1-3 are called CZ-0.5, CZ-1.0, and CZ-1.5, respectively.

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Abstract

The invention provides a preparation method of cerium-zirconium composite oxide loaded with noble metal. The preparation method comprises the steps that a cerium source, a zirconium source and at least one rare-earth metal source except cerium are mixed after being dissolved respectively, pH is regulated to be acid, a noble metal source is added, a constant volume is obtained, and first hydrothermal treatment is performed; and the pH is regulated to be alkaline, second hydrothermal treatment is performed, and the composite oxide is obtained after the obtained product is subjected to high-temperature thermal treatment. Compared with an existing noble metal loading method, the preparation method of the cerium-zirconium composite oxide loaded with the noble metal is simple and easy to implement, the cerium-zirconium composite oxide containing fine noble metal particles which are uniformly scattered and uniform in size can be obtained, and improvement to the low-temperature catalytic activity and anti-aging activity of cerium-zirconium catalysts is benefited; and the cerium-zirconium composite oxide prepared through the method and loaded with the noble metal has a remarkable CO low-temperature catalytic oxidation advantage, can maintain a good catalytic oxidation effect even after high-temperature aging and can be applied to low-temperature catalytic moving source tail gases or industrial gases.

Description

technical field [0001] The invention relates to the technical field of tail gas purification catalysts, in particular to a cerium-zirconium composite oxide loaded with precious metals and a preparation method and application thereof. Background technique [0002] Mobile source is the abbreviation of mobile air pollution source, which can produce a large amount of pollutants, for example, a large amount of carbon monoxide (CO), nitrogen oxide (NO X ) and harmful gases such as hydrocarbons (HC). [0003] At present, the main means to solve the cold start exhaust problem is to install a purifier with a built-in catalyst at the exhaust emission of the vehicle. Cerium-zirconium composite oxides are widely used in the field of automobile exhaust catalysis. In addition to participating in catalytic reactions, cerium-zirconium composite oxides also have the function of a carrier to support and disperse catalytically active metals. In addition, they can also provide a catalyst for t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J35/02B01D53/86B01D53/62B01J35/00
CPCB01J23/002B01J23/63B01D53/864B01J2523/00B01J35/40B01J2523/3706B01J2523/3712B01J2523/3718B01J2523/48Y02A50/20
Inventor 宋锡滨邢晶刘洪升焦英训
Owner SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD