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Method for preparing cerium-zirconium-aluminum composite oxide

A composite oxide, cerium zirconium aluminum technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., can solve the complex preparation process, high cost, structure and texture. structural instability

Inactive Publication Date: 2020-06-02
启东润博园区管理服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Currently, the preparation of CeO 2 -ZrO 2 -Al 2 o 3 There are many methods of (CZA), such as hydrothermal crystallization method, impregnation method, sol-gel method and co-precipitation method, but the current CZA materials still have the problem of unstable structure and texture, the preparation process is relatively complicated, and the cost is too high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A method for preparing cerium-zirconium-aluminum composite oxides, comprising the steps of: 35 parts of CeO 2 and 20 parts ZrO 2 Put it into a planetary high-energy ball mill, use a stainless steel tank and quenched steel balls, the ball-to-material ratio is 10:1, the speed is 250r / min, ball mill for 32 hours under the protection of argon, and then add 55 parts of Al 2 o 3 The powder is then ball-milled for 32 hours, and then the obtained powder is placed in a box-type resistance furnace, roasted at 890° C. for 3 hours, and cooled to obtain the product; all raw materials are parts by weight.

Embodiment 2

[0016] A method for preparing cerium-zirconium-aluminum composite oxides, comprising the steps of: 30 parts of CeO 2 and 15 parts of ZrO 2 Put it into a planetary high-energy ball mill, use a stainless steel tank and quenched steel balls, the ball-to-material ratio is 10:1, the speed is 250r / min, ball mill for 31 hours under the protection of argon, and then add 50 parts of Al 2 o 3 The powder is then ball-milled for 31 hours, and then the prepared powder is placed in a box-type resistance furnace, roasted at 885° C. for 2.5 hours, and cooled to obtain the product; all raw materials are parts by weight.

Embodiment 3

[0018] A method for preparing cerium-zirconium-aluminum composite oxides, comprising the steps of: 40 parts of CeO 2 and 25 parts ZrO 2 Put it into a planetary high-energy ball mill, use a stainless steel tank and quenched steel balls, the ball-to-material ratio is 10:1, the speed is 250r / min, ball mill for 33 hours under the protection of argon, and then add 60 parts of Al 2 o 3 The powder is then ball-milled for 33 hours, and then the prepared powder is placed in a box-type resistance furnace, roasted at 895° C. for 3.5 hours, and cooled to obtain the product; all raw materials are parts by weight.

[0019] The method is simple, fast and easy to operate, and can prepare a large amount of CeO 2 -ZrO 2 The composite powder of solid solution, the prepared cerium-zirconium-aluminum composite oxide has good stability, large specific surface area and excellent catalytic activity.

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Abstract

The invention discloses a method for preparing a cerium-zirconium-aluminum composite oxide. The method comprises the following steps: putting CeO2 and ZrO2 into a planetary high-energy ball mill, andcarrying out ball milling for 31-33 h under argon protection, wherein a stainless steel tank and quenched steel balls are used, a ball-to-material ratio is 10:1, and the rotating speed is 250 r / min; adding Al2O3 powder, and continuously carrying out ball milling for 31-33 h; and placing the prepared powder in a box-type resistance furnace, roasting for 2.5-3.5 h at a temperature of 885-895 DEG C,and cooling to obtain the product. The method is simple, convenient, rapid and easy to operate, the composite powder containing a large amount of CeO2-ZrO2 solid solution can be prepared, and the prepared cerium-zirconium-aluminum composite oxide has good stability, large specific surface area and excellent catalytic activity.

Description

technical field [0001] The invention relates to a method for preparing cerium-zirconium-aluminum composite oxide. Background technique [0002] In three-way catalysts for automobile exhaust, γ-Al 2 o 3 Because of its stable high specific surface area and strong surface adsorption capacity, it is often used as a carrier and coating material, CeO 2 -ZrO 2 It is often used as an additive because of its good oxygen storage capacity. But Al 2 o 3 It is easy to undergo α phase transition and lose activity at high temperature, CeO 2 -ZrO 2 It is also easy to sinter and grow at high temperature, and its specific surface area will drop sharply, resulting in a decrease in the performance of oxygen storage and release. Therefore, the key to improving the performance of three-way catalysts is to prepare catalytic materials with excellent texture properties and good thermal stability at high temperatures. [0003] In recent years, CeO 2 -ZrO 2 and Al 2 o 3 There have been ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10
CPCB01J23/002B01J23/10B01J2523/00B01J2523/31B01J2523/3712B01J2523/48
Inventor 不公告发明人
Owner 启东润博园区管理服务有限公司
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