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A kind of preparation method of high oxygen storage cerium zirconium composite oxide

A composite oxide and oxygen storage technology, which is applied in chemical instruments and methods, catalyst activation/preparation, zirconia, etc., can solve the problems of low oxygen storage capacity and unsatisfactory practical application of cerium-zirconium composite oxides, and achieve remarkable results Oxygen storage capacity, save oxidation time, and improve production efficiency

Active Publication Date: 2022-06-24
SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 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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  • A kind of preparation method of high oxygen storage cerium zirconium composite oxide
  • A kind of preparation method of high oxygen storage cerium zirconium composite oxide

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preparation example Construction

[0051] The invention provides a preparation method of a cerium-zirconium composite oxide, comprising the steps of preparing by a hydrothermal method, and the details are as follows:

[0052] S1, dissolve the salts of cerium, zirconium and rare earth metals respectively, and the total concentration is 20-160g / L;

[0053] S2, adding 30% H to the above solution at a molar ratio of hydrogen peroxide to cerium oxide of 1.5-3:1 2 O 2 , stir and oxidize for 5-35min;

[0054] S3, drip alkaline precipitating agent, described alkaline precipitating agent is one or more in ammoniacal liquor, sodium hydroxide, amines, preferably is mainly based on ammoniacal liquor, then adjust solution pH to 1.5-2;

[0055] S4, introducing the above solution into a high-pressure reaction kettle, and performing a high-temperature hydrolysis reaction at 120-220° C. for 10-20h;

[0056] S5, adding an alkaline precipitant to the precursor slurry obtained in S3 dropwise to adjust the pH to 8-10;

[0057] ...

Embodiment 1

[0061] Embodiment 1 provides a kind of cerium-zirconium composite oxide, which is prepared by the following method:

[0062] Take 527.1g of zirconium nitrate, dissolve it in 2000ml of deionized water until it becomes clear, and take another 32.1g of yttrium oxide, dissolve it in 82.0g of concentrated nitric acid, and mix it with the above solution, then add 159.2g of ceric ammonium nitrate and 23.4g of lanthanum nitrate, and stir until it becomes clear , to obtain solution A, and then add 30% H into solution A at a ratio of 2:1 in which the molar ratio of hydrogen peroxide to cerium oxide in the obtained composite oxide is 2 O 2 , stirred and oxidized for 5min;

[0063] The oxidized solution A was adjusted to pH 1.5-2 with ammonia water under the condition of 50 ℃ water bath, the volume was adjusted to 6400ml, and introduced into the pressure-dissolving bomb lined with PTFE, and hydrothermally hydrolyzed at 180 ℃ for 20 hours, at room temperature Adjust the pH to about 9.5 w...

Embodiment 2-4

[0067] Examples 2-4 were prepared according to the preparation method of Example 1 to obtain a cerium-zirconium composite oxide (composition: CeO 2 20%, ZrO 2 65%, La 2 O 3 3.5%, Y 2 O 3 12.5%), the difference is only in the preparation process, adding 30% hydrogen peroxide to the mixed salt solution of cerium, zirconium and rare earth metals for stirring and oxidizing the time is different, the oxidation time of Examples 2-4 is 10min, 15min, 20min respectively.

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Abstract

The invention provides a method for preparing a high oxygen storage cerium-zirconium composite oxide, wherein the cerium-zirconium composite oxide includes cerium oxide, zirconium oxide and at least one oxide of rare earth metal elements other than cerium, the method It includes the step of pretreating the salts of cerium, zirconium and rare earth metals in the process of preparing the cerium-zirconium composite oxide by hydrothermal method, and the pretreatment is oxidation treatment. Using the preparation method provided by the present invention, the cerium-zirconium composite oxide with high oxygen storage capacity can be obtained, and the cerium-zirconium composite oxide has a large pore volume structure and specific surface area, has a significant oxygen storage capacity, and remains It can maintain a good oxygen storage effect.

Description

technical field [0001] The invention relates to the field of inorganic catalytic materials, in particular to a preparation method of a cerium-zirconium solid solution with high oxygen storage capacity. Background technique [0002] With the development of industrialization, 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 has become a serious problem in today's society. [0003] Cerium-based oxygen storage materials (such as ceria) can store oxygen in oxygen-rich (lean) conditions and release oxygen in oxygen-lean (rich) conditions, thereby maintaining a relatively stable redox ratio and ensuring catalyst performance. Maximum catalytic purification effect. in which cerium ions generate Ce in an oxidizing or reducing atmosphere 3+ and Ce 4+ Oxygen can be stored under oxygen-enriched conditions, ensuring NO X The reduction, while releasing oxygen under o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01J35/10B01J37/03B01J37/08B01J37/10B01J37/12C01F17/32C01G25/02
CPCB01J23/10B01J23/002B01J37/10B01J37/12B01J37/031B01J37/088C01G25/02B01J2523/00C01F17/206B01J35/613B01J35/615B01J35/635B01J35/633B01J35/647B01J2523/36B01J2523/3706B01J2523/3712B01J2523/48B01J2523/3725
Inventor 宋锡滨邢晶刘洪升焦英训
Owner SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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