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Preparation method of CeO2-ZrO2-Al2O3 oxygen-storage material

A technology of ceo2-zro2-al2o3 and oxygen storage materials, which is applied in the field of microwave calcination co-precipitation preparation, can solve the problems of incomplete cerium-zirconium complexes, uneven particle mixing, and insufficient uniformity, and achieve easy automatic control and thermal stability Good, high heating effect

Inactive Publication Date: 2013-10-16
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: the produced cerium-zirconium complex is incomplete, easy to agglomerate powder, complex process, relatively coarse grain and not uniform enough
Its disadvantages are: uneven mixing between particles, high cost and complicated process, etc.

Method used

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  • Preparation method of CeO2-ZrO2-Al2O3 oxygen-storage material

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Experimental program
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Effect test

Embodiment 1

[0029] Firstly, 25%Ce(NO 3 ) 3 ·6H 2 O, 25%Zr(NO 3 ) 4 ·8H 2 O and 50%Al(NO 3 ) 3 ·6H 2 O was added to deionized water to prepare a mixed salt solution, and 2% H 2 o 2 Will Ce 3+ Oxidized to Ce 4+ , the solution changed from colorless to light yellow, then added 5% PVA, and stirred for 30min. Then mix ammonium carbonate and ammonia water according to the mass ratio of 1:1 to prepare a buffered alkali solution for later use. The mixed salt solution and the prepared buffered alkali solution are mixed by co-current method and continuously stirred, and the pH of the solution is controlled to be 8. After the purplish red precipitation is complete, it is aged at 85°C for 8h. The aged solution was vacuum filtered to obtain CeO 2 -ZrO 2 -Al 2 o 3 Oxygen storage material precursor filter cake A. The obtained CeO 2 -ZrO 2 -Al 2 o 3 Oxygen storage material precursor filter cake is dried in a 2.45GHz frequency industrial microwave oven with a microwave heating power ...

Embodiment 2

[0031] Firstly, 25%Ce(NO 3 ) 3 ·6H 2 O, 25%Zr(NO 3 ) 4 ·8H 2 O and 50%Al(NO 3 ) 3 ·6H 2 O was added to deionized water to prepare a mixed salt solution, and 3% H 2 o 2 Will Ce 3+ Oxidized to Ce 4+ , the solution changed from colorless to light yellow, then added 7.5% PVA, and stirred for 45min. Then, ammonium carbonate and ammonia water are formulated into a buffered alkali solution according to the mass ratio of 3:2 for later use. The mixed salt solution and the prepared buffered alkali solution are mixed in parallel and continuously stirred to control the pH of the solution to 9. After the purplish red precipitation is complete, it is aged at 90°C for 6h. The aged solution was vacuum filtered and spray-dried to obtain CeO 2 -ZrO 2 -Al 2 o 3 Oxygen storage material precursor powder B. The obtained CeO 2 -ZrO 2 -Al 2 o 3 Oxygen storage material precursor filter cake is dried in a 2.45GHz frequency industrial microwave oven with a microwave heating power o...

Embodiment 3

[0033] Firstly, 25%Ce(NO 3 ) 3 ·6H 2 O, 25%Zr(NO 3 ) 4 ·8H 2 O and 50%Al(NO 3 ) 3 ·6H 2 O was added to deionized water to prepare a mixed salt solution, and 5% H 2 o 2 Will Ce 3+ Oxidized to Ce 4+ , the solution changed from colorless to light yellow, then added 10% PVA, and stirred for 60min. Then, ammonium carbonate and ammonia water are formulated into a buffered alkali solution according to the mass ratio of 4:3 for later use. The mixed salt solution and the prepared buffered alkali solution are mixed by co-current method and continuously stirred, and the pH of the solution is controlled to be 10. After the purplish red precipitation is complete, it is aged at 95°C for 4h. The aged solution was vacuum filtered and spray-dried to obtain CeO 2 -ZrO 2 -Al 2 o 3 Oxygen storage material precursor powder C. The obtained CeO 2 -ZrO 2 -Al 2 o 3 Oxygen storage material precursor filter cake is dried in a 2.45GHz frequency industrial microwave oven with a micro...

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Abstract

The invention discloses a preparation method of a CeO2-ZrO2-Al2O3 oxygen-storage material, and relates to a microwave calcination and coprecipitation preparation method for an oxygen-storage material for automobile exhaust catalytic purification. The preparation method is characterized in that the CeO2-ZrO2-Al2O3 oxygen-storage material is prepared from Ce(NO3)3.6H2O, ZrOCl2.8H2O and Al(NO3)3.6H2O after preparing a CeO2-ZrO2-Al2O3 precursor through coprecipitation and implementing microwave calcination. The preparation method has the effects and advantages that the CeO2-ZrO2-A12O3 solid solution oxygen-storage material, which is prepared at relatively low temperature through a microwave calcination technology, is simple in preparation process, low in cost, and remarkable in oxygen-storage capacity and thermal stability effect.

Description

Technical field [0001] A CEO 2 -Zro 2 -L 2 O 3 The preparation method of oxygen storage materials involves a microwave burning preparation method for the storage of oxygen storage materials for car tail gas catalysis and purification. Background technique [0002] Car tail gas is one of the main reasons for air pollution. It has attracted great attention from countries around the world and invested a lot of funds, technology and manpower for governance.For a long time, the precious metals such as the inorganic oxide such as oxide are used to form a ternary catalyst to purify and catalyze the exhaust emissions of the car.In this ternary catalyst, precious metals have the effects of nitrogen oxides and carbon monoxide and hydrocarbon oxidation reactions.In addition, inorganic oxides have increased the surface area of precious metals and divergent reactions to generate heat and inhibit the sintering effect of precious metals.In particular, oxidation has the ability to storage oxygen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/34B01J35/10B01J23/10
Inventor 刘永鹤
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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