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Cerium-zirconium composite oxide as well as preparation method and application thereof

A composite oxide, cerium oxide technology, applied in chemical instruments and methods, catalyst activation/preparation, separation methods, etc., can solve the problems of unsatisfactory practical application, low oxygen storage capacity of cerium zirconium composite oxide, etc. Oxygen storage capacity, improving oxygen storage performance, good oxygen storage and reducing effect

Active Publication Date: 2019-07-19
SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The oxygen storage capacity of the cerium-zirconium composite oxide prepared by the above method is low, which is not ideal in practical application

Method used

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  • Cerium-zirconium composite oxide as well as preparation method and application thereof
  • Cerium-zirconium composite oxide as well as preparation method and application thereof
  • Cerium-zirconium composite oxide as well as preparation method and application thereof

Examples

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preparation example Construction

[0047] The invention provides a method for preparing a cerium-zirconium composite oxide, including the steps of preparing by hydrothermal method, specifically as follows:

[0048] S1, dissolving salts of cerium, zirconium, and rare earth metals respectively, with a total concentration of 20-160g / L;

[0049] S2, add an appropriate amount of 30% H to the above solution 2 o 2 , stirred and oxidized for 5-35min;

[0050] S3, drop an alkaline precipitating agent, the alkaline precipitating agent is one or more of ammonia water, sodium hydroxide, and amines, preferably ammonia water, and then adjust the pH of the solution to 1.5-2;

[0051] S4, introducing the above solution into a high-pressure reactor, and performing a high-temperature hydrolysis reaction at 120-220° C. for 10-20 hours;

[0052] S5, adding an alkaline precipitant dropwise to the precursor slurry obtained in S3 to adjust the pH to 8-10;

[0053] S6, introducing the precursor slurry obtained in S4 into an autocl...

Embodiment 1

[0057] Example 1 provides a cerium-zirconium composite oxide, which is prepared by the following method:

[0058] Take 473.5g of zirconium nitrate, dissolve it with 2000ml of deionized water until it becomes clear, and take another 16.3g of yttrium oxide, dissolve it with 53.2g of concentrated nitric acid, mix it with the above solution, add 434.4g of ammonium cerium nitrate and 84.9g of lanthanum nitrate, and stir until it becomes clear. Obtain solution A, then add 30% H in solution A with 1.5 times the molar amount of cerium 2 o 2 , stirred and oxidized for 10 minutes;

[0059] Adjust the pH of the oxidized solution A to 1.5-2 with ammonia water in a 50°C water bath, set the volume to 6400ml, and introduce it into a polytetrafluoroethylene-lined pressure melting bomb. Adjust the pH to about 9.5 with ammonia water to obtain slurry B;

[0060] Transfer the slurry B to a titanium kettle, and conduct a hydrothermal reaction at 180° C. for 10 h at a rotation speed of 200 r / min...

Embodiment 2

[0063] Example 2 provides a cerium-zirconium composite oxide, which is prepared by the following method:

[0064] Take 550.7g of zirconium nitrate, dissolve it with 2000ml of deionized water until it becomes clear, take another 39.9g of yttrium oxide, dissolve it with 102.0g of concentrated nitric acid and mix it with the above solution, then add 194.9g of ammonium cerium nitrate and 22.3g of lanthanum nitrate, and stir until it becomes clear , to obtain solution A, and then add 30% H with 1.5 times the molar amount of cerium to solution A 2 o 2 , stirred and oxidized for 10 minutes;

[0065] Adjust the pH of the oxidized solution A to 1.5-2 with ammonia water in a 50°C water bath, set the volume to 6400ml, and introduce it into a polytetrafluoroethylene-lined pressure melting bomb. Adjust the pH to about 9.5 with ammonia water to obtain slurry B;

[0066] Transfer the slurry B to a titanium kettle, and conduct a hydrothermal reaction at 180° C. for 10 h at a rotation speed...

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Abstract

The invention provides a cerium-zirconium composite oxide which comprises a cerium-containing oxide, a zirconium-containing oxide and at least one oxide, wherein the oxide is selected from rare-earthmetallic elements except cerium; the content of the oxide which is selected from rare-earth metallic elements except cerium is 10-20wt%; after 4-8 hours of thermal treatment at 950 DEG C, the composite oxide has a pore volume of 0.30-0.60ml / g, a specific surface area of 58-100m<2> / g and an oxygen storage amount of 1.00mmol[O] / g at least. The cerium-zirconium composite oxide provided by the invention has a large pore volume structure, has a remarkable oxygen storage capability, and has a very good oxygen storage effect after high-temperature aging.

Description

technical field [0001] The invention relates to the field of inorganic catalytic materials, in particular to a cerium-zirconium composite oxide and its preparation method and application. Background technique [0002] With the development of industrialization, motor vehicle exhaust, industrial waste gas, chemical waste gas, etc. have become the main sources of urban air pollution, reducing CO, HC, NO X The emission of harmful gases such as pollutants has become a serious problem in today's society. [0003] Cerium-based oxygen storage materials (such as ceria) can store oxygen in the case of oxygen-rich (lean-burning), and release oxygen in the case of oxygen-poor (rich-burning), thereby maintaining a relatively stable redox ratio and ensuring the catalytic performance of the catalyst. Maximum catalytic purification effect. Among them, cerium ions generate Ce under oxidizing or reducing atmosphere 3+ and Ce 4+ The oxidation-reduction reaction between them can store oxyge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J35/10B01J37/10B01D53/46B01D53/86
CPCB01J23/10B01J37/10B01D53/46B01D53/86B01J35/613B01J35/633B01J35/647
Inventor 宋锡滨邢晶刘洪升焦英训
Owner SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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