Three-effect catalyst for purifying exhaust of lean-burn automotive and preparation method thereof

A lean-burn engine, three-way catalyst technology, applied in combustion engines, internal combustion piston engines, physical/chemical process catalysts, etc. Good thermal stability, improved catalytic performance, and high low-temperature activity
CN101474553AInactive Publication Date: 2009-07-08SHANTOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANTOU UNIV
Publication Date
2009-07-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a three-way catalyst for purifying and treating lean-burn engine tail gas and a preparation method thereof. The catalyst comprises the oxides of zirconium, cerium and copper. The mol ratio of the three oxides is 0-20:0-2.5:1, wherein, the sum of the mole numbers of the oxides of the cerium and the zirconium is more than 80% of the mole number of the oxide of the copper. Water soluble zircon salt, cerium salt, copper salt and lanthanum salt form water solution composition. After citric acid is added and hartshorn is dropwise added, the solid is parched and roasted, and the catalyst is gained. The catalyst obviously reduces the conversion temperature of NO, HC and CO and has a three-way catalytic and purifying effect. The catalyst can completely desorb the CO in simulated lean-burn engine tail gas at a temperature above 200 DEG C and completely desorb NO, HC and CO at a temperature below 300-350 DEG C, can be used in an exhaust system of a lean-burn engine to eliminate the environmental pollutions of NO, HC and CO.
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Description

[0001] Involved areas

[0002] The invention relates to the purification and treatment technology of motor vehicle tail gas, in particular to a three-way catalyst for purifying and treating hydrocarbon compounds, carbon monoxide and nitrogen oxides in lean-burn engine tail gas and a preparation method thereof. Background technique

[0003] With the rapid increase in the number of motor vehicles, carbon monoxide (CO), hydrocarbon compounds (HC) and nitrogen oxides (NO) emitted into the atmosphere x , of which NO accounts for more than 90%) is increasing day by day, and the impact on human production and life is also increasing. In order to reduce pollution, countries have formulated relevant standards and laws to limit the emission of motor vehicle exhaust. Europe has changed from Euro 1 to Euro 5, and my country implemented the National III emission standard in 2007. In order to alleviate the global energy crisis, the development and application of energy-saving lean-burn en...

Claims

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