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Cerium/aluminum-based composite oxide with high specific surface area and its preparation method

A composite oxide, high specific surface area technology, used in chemical instruments and methods, separation methods, chemical/physical processes, etc., can solve the problems of large equipment, poor high temperature aging resistance, and high production costs, and can inhibit grain growth. Large, good thermal stability, easy to operate

Inactive Publication Date: 2013-01-02
南京辉虎环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Chinese patent CN1193948 reports that zirconium nitrate and cerium nitrate are used as raw materials. Under the condition of temperature higher than 100 °C, cerium-zirconium salts are precipitated by a precipitant to obtain a composite product, but the specific surface area of ​​the product is 30m after roasting at 900 °C. 2 / g, the product has poor high temperature aging resistance
[0008] The cerium-aluminum-based oxygen storage material prepared in the US patent US20020090512 is calcined at 600°C for 5 hours, and the pore dissolution is about 0.07ml / g, and after calcination at 800°C for 5 hours, the pore dissolution is reduced to about 0.04ml / g, and the production process uses pressure vessel equipment , huge equipment, high production cost

Method used

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  • Cerium/aluminum-based composite oxide with high specific surface area and its preparation method
  • Cerium/aluminum-based composite oxide with high specific surface area and its preparation method

Examples

Experimental program
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Embodiment 1

[0034] This example illustrates that the general chemical formula is Al 0.75 Ce 0.2 R 0.05 o 2 Preparation of Ce-Al-based composite oxides:

[0035] 1.5mol Al(NO 3 ) 3 9H 2 O, 0.4mol Ce(NO 3 ) 3 ·6H 2 O, 0.1mol La(NO 3 ) 3 ·6H 2Make 800ml mixed solution of O and deionized water, heat to 45±5℃, add 15g of additive (polyethylene glycol), stir for 10 minutes, then add 600ml of precipitant prepared by 5M ammonia water and 4mol hydrogen peroxide , the pH value in the reaction system will gradually increase during the dropping process, keep stirring until all the precipitant is added, control the temperature of the reaction system at 45±5°C, the pH of the reaction system=9.0±0.5, white precipitates are formed, continue to stir The reaction mixture was 30 minutes, the precipitate was filtered, washed three times with deionized water and ethanol respectively, and then the precipitate was dried in a blast oven at 110±10°C for 10 hours, and then roasted in a vacuum oven at 5...

Embodiment 3

[0039] This example illustrates that the general chemical formula is Al 0.45 Ce 0.5 R 0.05 o 2 Preparation of Ce-Al-based composite oxides:

[0040] 1.35mol Al(NO 3 ) 3 9H 2 O, 1.5mol Ce(NO 3 ) 3 ·6H 2 O, 0.15mol La(NO 3 ) 3 ·6H 2 Make 800ml mixed solution of O and deionized water, heat to 45±5℃, add 30g of additive (polyethylene glycol), stir for 10 minutes, then add 800ml of precipitant prepared by 5M ammonia water and 5mol hydrogen peroxide , the pH value in the reaction system will gradually increase during the dropping process, keep stirring until all the precipitant is added, control the temperature of the reaction system at 50±5°C, the pH of the reaction system=10.0±0.5, white precipitate is formed, continue to stir Reaction mixture for 30 minutes, filter the precipitate, wash with deionized water and ethanol three times respectively, then dry the precipitate in a blast oven at 110±10°C for 10 hours, then bake in a vacuum oven at 600±20°C for 3 hours , the ...

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Abstract

The invention provides a cerium / aluminum-based composite oxide with high specific surface area and its preparation method. The composite oxide has chemical formula of AlzCexRyO2, wherein R is rare earth element, x (10-50%), y (1-8%) and z (1-x-y) are molar ratios of Al, Ce and R. The composite oxide is used in three-way catalyst for exhaust gas purification of automobile, has large specific surface area, high thermal stability, and strong oxygen storage ability.

Description

technical field [0001] The invention relates to a high specific surface area cerium-aluminum-based composite oxide and a preparation method thereof. This type of material can be widely used in various waste gas purification or catalyst carrier materials, such as motor vehicle exhaust purification, flue gas desulfurization, organic waste gas elimination and ceramic additives. Background technique [0002] With the further stringent emission regulations at home and abroad, the requirements for motor vehicle exhaust emissions are getting higher and higher. So far, the installation of a three-way catalytic converter is an important means to effectively control the exhaust emissions of motor vehicles. Composite oxide coating materials with high specific surface area have become an indispensable key material in three-way catalysts as catalyst additives for automobile exhaust purification. Its function is mainly to increase the effective area of ​​the catalyst, improve the therma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J23/10B01J35/10B01D53/94
Inventor 游素月
Owner 南京辉虎环保科技有限公司
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