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Ternary-cerium-based oxygen storage material and preparation method thereof

A technology of oxygen storage materials and rare earth materials, which is applied in the field of ternary cerium-based oxygen storage materials and its preparation, can solve the problems of insufficient total oxygen storage capacity, dynamic oxygen storage performance, and insufficient high-temperature sintering resistance, and achieve stable and efficient storage Oxygen capacity, reduction of precious metal usage, and effects of weakening fluctuations

Active Publication Date: 2013-01-02
HUBEI HANGTE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a high-performance cerium-based ternary oxygen storage material and its preparation method in view of the insufficient total oxygen storage capacity and dynamic oxygen storage performance of existing oxygen storage materials, and insufficient high-temperature sintering resistance

Method used

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  • Ternary-cerium-based oxygen storage material and preparation method thereof
  • Ternary-cerium-based oxygen storage material and preparation method thereof
  • Ternary-cerium-based oxygen storage material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0056] Weigh the rare earth compound Ce(NO 3 ) 3 ·6H 2 O, Zr(NO 3 )4·5H 2 O, La(NO 3 ) 3 ·6H 2 O, dissolved in 1400mL of deionized water to prepare a solution with a metal ion concentration of about 0.5mol / L, adding hydrogen peroxide solution with a volume of 1% of the solution, and adding barium nitrate with a mass of 5% solid solution. Prepare a 3mol / L ammonia solution and a 3mol / L ammonium carbonate solution and mix them in a volume ratio of 1:1 as a precipitant.

[0057] Under 45°C constant temperature water bath and 200Kw ultrasonic conditions, the mixed solution and the precipitating agent are stirred in parallel in an appropriate proportion, and the pH of the solution is controlled at 8 during the concurrent flow. Stirring was continued for 1 h after co-flow was completed. Then add polyethylene glycol with a solid solution mass of 8% to adjust the pH to 10. After aging at 100° C. for 4 hours, take it out, and let it stand at room temperature for 12 hours. The p...

Embodiment 2

[0062] Weigh the rare earth compound Ce(NO 3 ) 3 ·6H 2 O, Zr(NO 3 )4·5H 2 O, La(NO 3 ) 3 ·6H 2 O, dissolved in 1400mL of deionized water to prepare a solution with a metal ion concentration of about 0.5mol / L, add 0.5% hydrogen peroxide solution by volume, and 5% copper nitrate by solid solution mass. Prepare a 3mol / L ammonia solution and a 3mol / L ammonium carbonate solution and mix them in a volume ratio of 1:1 as a precipitant.

[0063] Under the conditions of 80°C constant temperature water bath and 200Kw ultrasonic conditions, the mixed solution and the precipitating agent are stirred in parallel in an appropriate proportion, and the pH of the solution is controlled at 8 during the concurrent flow. Stirring was continued for 1 h after co-flow was completed. Then add polyethylene glycol with 5% solid solution mass to adjust the pH to 10. Stand at room temperature for 12h. The precipitate was suction filtered, washed with deionized water, pH = 7, and dried at 120° C...

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Abstract

The invention discloses a ternary-cerium-based oxygen storage material and a preparation method thereof. The oxygen storage material consists of an oxygen storage material main body, aids, and a dispersing agent; the oxygen storage material main body is a rare earth material which consists of cerous nitrate, zirconium nitrate and lanthanum nitrate; the aids are barium nitrate, copper nitrate, manganous nitrate or magnesium nitrate; the dispersing agent is polyvinyl alcohol, polyethylene glycol or citric acid; and the material has the advantage of obviously reducing the ignition temperature oftail gas catalytic conversion of a three-way catalytic converter, prolonging the service life of the three-way catalytic converter, and greatly reducing the fluctuation of air-fuel ratio windows during working of the three-way catalytic converter. Compared with the three-way catalytic converter in which the oxygen storage material is not adopted, the three-way catalytic converter in which the oxygen storage material is adopted has the advantage that the using amount of noble metal can be reduced by over 17 percent.

Description

technical field [0001] The invention relates to a ternary cerium-based oxygen storage material and a preparation method thereof. Background technique [0002] At present, the control technology of motor vehicle pollutant emission can be divided into three categories, which are pre-combustion control technology, in-combustion control technology and exhaust gas purification technology. Among them, the exhaust gas purification technology mainly adopts three-way catalytic converter technology, and the three-way catalytic converter (Three Way Catalyst) mainly consists of four parts: carrier, alumina coating, active components and additives. Through the catalytic oxidation and reduction reaction between CO, HC and NOx, the three-way catalyst can simultaneously reduce CO, HC and NOx emissions of gasoline engines by more than 90%. The catalytic activity of the three-way catalyst is related to the air-fuel ratio. There is a working window around the theoretical air-fuel ratio of 14....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10
CPCY02T10/22Y02T10/12
Inventor 童硕廖宏鹏万超
Owner HUBEI HANGTE TECH CO LTD
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