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Spinelle type composite oxides for catalytic purification of motor vehicle tail gas and method of preparing the same

A composite oxide, spinel-type technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, separation methods, etc., can solve the problems of immature preparation methods and achieve rich sources. , the effect of simple catalyst structure and simple manufacturing process

Inactive Publication Date: 2008-10-01
天津环科机动车技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although, due to various reasons, it has not been widely used in the purification of motor vehicle exhaust, and its preparation method is not very mature, but its high catalytic activity, stable structure, clear composition, good redox characteristics and resistance High temperature performance has attracted the attention of many enterprises and technicians

Method used

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  • Spinelle type composite oxides for catalytic purification of motor vehicle tail gas and method of preparing the same
  • Spinelle type composite oxides for catalytic purification of motor vehicle tail gas and method of preparing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] When x=0, according to the stoichiometric ratio Cu 2+ : Ni 3+ =1:2-x add Cu(NO 3 ) 2 , Ni(NO 3 ) 3 , and add a certain amount of citric acid, put it into a round bottom beaker with a capacity of 1000ml, stir and add water to dissolve. Gradually heat at 100°C to boil and concentrate until ashing occurs to obtain the spinel matrix; then put the matrix into a muffle furnace and burn at 500°C for 3-8 hours to obtain the final product. The crystal phase analysis of the sample was carried out by X-ray diffraction (XRD) method, and the radiation source was CuKa. According to the X-ray diffraction analysis results, the powder is a composite oxide with a spinel structure.

Embodiment 2

[0019] When x=0.5, according to stoichiometric ratio Cu 2+ : Ni 3+ :Mn 3+ =1:2-x:x added Ni(NO 3 ) 3 , Cu(NO 3 ) 2 , Mn(NO 3 ) 2 , and add a certain amount of citric acid, put it into a round bottom beaker with a capacity of 1000ml, stir and add water to dissolve. Gradually heat at 100°C to boil and concentrate until ashing occurs to obtain the spinel matrix; then put the matrix into a muffle furnace and burn at 500°C for 3-8 hours to obtain the final product. According to the X-ray diffraction analysis results, the powder is a composite oxide with a spinel structure.

Embodiment 3

[0021] When x=2, according to stoichiometric ratio Cu 2+ :Mn 3+ =1:x add Cu(NO 3 ) 2 , Mn(NO 3 ) 2 , and add a certain amount of citric acid, put it into a round bottom beaker with a capacity of 1000ml, stir and add water to dissolve. Gradually heat at 100°C to boil and concentrate until ashing occurs to obtain the spinel matrix; then put the matrix into a muffle furnace and burn at 500°C for 3-8 hours to obtain the final product. According to the X-ray diffraction analysis results, the powder is a composite oxide with a spinel structure. See details figure 2 It is a sample evaluation experiment report of the present invention, light-off temperature: CO: 234°C; HC: 260°C; NOx: 278°C, catalyst composition: Pd / CuNi 1.5 mn 0.5 o 4 -CeO 2 -ZrO / Al 2 o 3 . Experimental Unit: Tianjin Chemical Industry Research and Design Institute

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Abstract

The invention relates to a spinel-typed compoposition oxide used for catalysis and purification of tail gases of motor vehicles, which is characterized in that the chemical formula is CuNi2-xMnxO4, wherein X is equal to 0-2. The preparation method comprises the steps as follows: stoichiometric ratio of Cu<2+>, Ni<3+> and Mn<3+> is equal to 1: <2-x>: x, metal nitrate and citric acid are mixed to prepare mixed solution which is then heated to 100 DEG C, boiled and concentrated to ashing so as to obtain loose maternal powders which are then grinded and calcined in a muffle furnace under the temperature of 450-550 DEG C for 3-8 hours so as to prepare the powers, thus forming composite oxide powders of spinel structural type. The invention has the beneficial effects that in the spinel-typed catalyst CuNi2->MnxO4, A position of spinel structure AB2O4 is formed by a copper element while B position thereof is formed by nickel and manganese elements; namely, the spinel-typed composite oxide consists of copper, nickel, manganese and oxygen. The adopted raw material has rich source, the manufacturing technique is simple without use of high-performance and complex processing equipments, and the structure of the catalyst is simple; therefore, the spinel-typed composite oxide is suitable for development conditions of China and has popularization values.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a spinel-type composite oxide for catalytic purification of motor vehicle exhaust and a preparation method thereof. Background technique [0002] For a long time, catalysts with noble metals as the main active components have occupied the main body of the automobile exhaust purification catalyst market. Since the 1990s, due to the gradual increase in the price of precious metals in the international market and the lack of resources, the three-way catalyst has been gradually improved in formula, with the research and development goal of reducing the amount of precious metals used. Adding rare earth composite oxides to catalysts to improve catalytic activity and reducing precious metals is an important development direction. From the perspective of reducing catalyst cost and improving catalyst activity, spinel-type composite oxide catalysts have great ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/94
Inventor 刘伯潭秦蓁豆立新
Owner 天津环科机动车技术开发有限公司