Oxygen storage material for catalytic purification of automobile exhaust and preparation method of oxygen storage matrial

A technology for catalytic purification and automobile exhaust, which is applied in the fields of pollution control and methods, can solve problems such as the decline of oxygen storage performance, and achieve the effects of simple method, easy operation and high oxygen storage performance.

Inactive Publication Date: 2012-10-24
JIANGSU GAOCHUN CERAMICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide an oxygen storage material for catalytic purification of automobile exhaust gas, which can be used in the coating of automobile exhaust gas purification catalysts to solve the problem of the decline in oxygen storage performance of automobile exhaust gas purification catalysts under high temperature and long-term use

Method used

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  • Oxygen storage material for catalytic purification of automobile exhaust and preparation method of oxygen storage matrial

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Get 217.1g cerium nitrate, 99.4g zirconium oxynitrate, 30.3g lanthanum nitrate, add deionized water to prepare mixed metal salt solution 1L, then add 30g polyethylene glycol 2000 and stir to dissolve, then under stirring condition, the mass fraction of ammonia is 5%, the mass fraction of ammonium carbonate is 10% ammonia water-ammonium carbonate buffer solution is added to the mixed metal salt solution to keep the pH value of the mixed solution at 8.0, react at room temperature for 1h and age for 2h, filter, wash with water, and finally at 100 °C for 3 h, and the dried product was calcined at 500 °C for 4 h to obtain a solid solution oxygen storage material Ce 0.5 Zr 0.43 La 0.07 o 2 .

[0028] The product is marked A.

Embodiment 2

[0030] Get 130.3g of cerium nitrate, 145.7g of zirconium oxynitrate, 29.9g of lanthanum nitrate and 0.40g of ferric nitrate, add deionized water to prepare 1L of mixed metal salt solution, then add 30g of polyethylene glycol 2000 and stir to dissolve, then dissolve under stirring The mass fraction of ammonia is 5%, the mass fraction of ammonium carbonate is 10% ammonia water-ammonium carbonate buffer solution, add mixed metal salt solution to keep the pH value of the mixed solution at 8.0, react at room temperature for 1h and age for 2h, filter, washed with water, and finally dried at 100°C for 3h, and the dried product was calcined at 500°C for 4h to obtain the solid solution oxygen storage material Ce of the present invention 0.3 Zr 0.63 Fe 0.001 La 0.069 o 2 .

[0031] The product is labeled B.

Embodiment 3

[0033] Take 173.7g of cerium nitrate, 179.8g of zirconium nitrate, 29.0g of lanthanum nitrate and 1.2g of ferric nitrate, add deionized water to prepare 1L of mixed metal salt solution, then add 30g of polyethylene glycol 4000 and stir to dissolve, then dissolve ammonia under stirring conditions The mass fraction of ammonium carbonate is 10%, and the mass fraction of ammonium carbonate is 10%. The ammonia water-ammonium carbonate buffer solution is added to the mixed metal salt solution to keep the pH value of the mixed solution at 8.5, react at room temperature for 2h and age for 1h, filter, wash with water , and finally dried at 120°C for 2h, and the dried product was calcined at 600°C for 3h to obtain the solid solution oxygen storage material Ce of the present invention 0.4 Zr 0.53 Fe 0.003 La 0.067 o 2 .

[0034] The product is marked C.

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Abstract

The invention relates to an oxygen storage material for the catalytic purification of automobile exhaust and a preparation method of the oxygen storage material. The oxygen storage material has a structure formula of CexZr(0.93-x)FeyLa(0.07-y)O2, wherein x is equal to 0.2-0.8 and y is equal to 0-0.01. The preparation method comprises the steps of weighing cerium salt, zircon salt, lanthanum salt and ferric salt according to the stoichiometric proportion in the structure formula and adding the salts in deionized water to prepare mixed solution; adding polyethylene glycol with a molecular weight of 2000-6000 into the mixed solution and adding a precipitator under stirring condition for reaction; after the reaction, carrying out ageing and filtration; and carrying out washing, drying and roasting on filtered matters. The oxygen storage material provided by the invention has good oxygen storage property, after being aged at a high temperature of 1000 DEG C for 5h, the oxygen storage material still has higher oxygen storage property, so that the oxygen storage material has high-temperature ageing resistance which is better than that of cerium-zircon composite oxide oxygen storage materials; and the oxygen storage material is simple in preparation method, easy to operate and suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of pollution control and technology, and relates to an oxygen storage material used for catalytic purification of automobile tail gas and a preparation method thereof. Background technique [0002] Automobile exhaust has become one of the main pollution sources of urban air pollution, which has aroused widespread concern and great attention from all over the world. Automobile exhaust catalytic purification technology is one of the most effective and reliable technologies for controlling automobile pollutants. Cerium-zirconium solid solution oxygen storage material is an important catalyst additive for automobile exhaust purification, which is used in the coating of automobile exhaust purification catalyst to improve the oxygen storage performance of automobile exhaust purification catalyst. In order to improve the oxygen storage performance of the cerium-zirconium solid solution, the main method at present is to intr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J23/10B01D53/94
Inventor 孙敏孔德双宦秀桦杨红兵
Owner JIANGSU GAOCHUN CERAMICS
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