Oxygen storage material for the catalytic purification of car exhaust gas

A technology for catalytic purification and oxygen storage materials, applied in energy. It can solve problems such as the decrease of oxygen storage capacity, and achieve the effects of no decrease in oxygen storage capacity, high oxygen storage capacity, and simple preparation process.

Inactive Publication Date: 2009-10-07
DALIAN UNIV OF TECH
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Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide a high-performance oxygen storage material for the catalytic purification of automobile exhaust, which can be used for the coating of automobile exhaust purification catalysts, so as to solve the problem of the high temperature (about 900 ° C or even 1000 ° C) of automobile exhaust purification catalysts. The problem of reduced oxygen storage capacity under conditions

Method used

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  • Oxygen storage material for the catalytic purification of car exhaust gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Specific steps are as follows:

[0018] (1) The molar ratio is (Ce:Zr):Fe=1-x:x, where x=0.1~0.9, Ce:Zr=6:4; weigh 1.00~20.00g of Ce(NO 3 ) 3 .6H 2 O and stoichiometric Zr(NO 3 ) 4 .5H 2 O, add 1.00-20.00g of citric acid, and then add an appropriate amount of deionized water.

[0019] (2) Add 60-100 ml of an appropriate amount of absolute ethanol to the solution of (1) above, and stir for 4-5 hours.

[0020] (3) Stirring was stopped, the above solution was put into a water bath at 75° C., and the solution was evaporated for 4 hours to make the solution a yellow clear liquid.

[0021] (4) Add a few drops of concentrated nitric acid to the above solution, then put it in an oven at 120°C, and dry it for 12 hours to obtain a yellow spherical powder. (5) The powder was fired at 600°C for 5 hours to obtain superfine particles of cerium-zirconium-iron composite oxide (Ce 0.6 Zr 0.4 ) x Fe 1-x o 2 .

Embodiment 2

[0022] Embodiment 2: with (Ce 0.6 Zr 0.4 ) 1-x Fe x o 2 In x=0.02, 0.1, 0.2, 0.5 as an example, list their oxygen storage capacity as a comparison, see Table 1.

[0023] Table 1. (Ce 0.6 Zr 0.4 ) x Fe 1-x o 2 Oxygen Storage Capacity Comparison

[0024] Table 1. (Ce 0.6 Zr 0.4 ) x Fe 1-x o 2 Oxygen Storage Capacity Comparison

[0025]

[0026] It can be seen from Table 1 that the cerium-zirconium-iron composite oxide prepared by us, with the increase of iron content, not only the low-temperature oxygen storage capacity increases, but also the oxygen storage capacity does not decrease much after high-temperature calcination. When the addition amount of iron is 0.5, the oxygen storage capacity of the sample is higher than that of the low-temperature roasted one. This shows that the powder we prepared has high anti-aging performance at high temperature, and is suitable as an auxiliary agent for a three-way catalyst.

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Abstract

The invention discloses an oxygen storage material for the catalytic purification of car exhaust gas, belongs to pollution control technology field, relates to an oxygen storage material for the catalytic purification of car exhaust gas, especially relates to an oxygen storage material which can remains the oxygen storage property at the elevated temperature of 900 Celsius system. The material is prepared with the colloidal sols jelly glue method which is indicated taking cerium nitrate, zirconium nitrate and ferric nitrate as raw charge, adding moderate citric acid as agglomerating agent, and preparing the powder of cerium ferro-zirconium composite oxides with taking de-ionized water as dissolvent and absolute ethyl alcohol as additive. The effect and benefit of this invention is indicated that the provided preparing technology for oxygen storage material is simple, which has stronger oxygen storage property of cerium zirconium composite oxides oxygen storage material, and especially the oxygen storage property does not fall after high temperature roasted.

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, in particular to an energy. Background technique [0002] Automobile exhaust is one of the main causes of air pollution, which has attracted great attention from all countries in the world, and a lot of money, technology and manpower have been invested in its treatment. Automobile exhaust gas purification catalysts are being widely used as environmental protection catalysts. [0003] CeO 2 It is an important part of the noble metal three-way catalyst, and it has been extensively studied since the 1970s. CeO 2 The main functions are: [0004] (1) Stabilize the alumina carrier and facilitate the uniform dispersion of precious metals on the surface; [0005] (2) Accelerate water-gas shift and steam reforming, increase CO, NO x and the conversion rate of HC; [0006] (3) Due to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/94B01J23/83B01J21/06B01J23/10B01J23/745
Inventor 石川查进朱爱民徐勇
Owner DALIAN UNIV OF TECH
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