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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

Inactive Publication Date: 2009-07-08
SHANTOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The combustion temperature of this technical solution is still high, and the treatment effect on NO and HC is not ideal

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: CeCuO 3-λ The catalytic effect of the catalyst

[0025] Ce(NO at a molar ratio of 1:1 3 ) 3 ·6H 2 O and Cu(NO 3 ) 2 ·3H 2 O is added to deionized water, under constant temperature conditions of 80°C, fully stirred, after completely dissolving, add citric acid to the solution, the molar ratio of citric acid to the sum of metal ions is 1.5: 1, and continue to stir at 80°C, After 30 minutes, 25 wt% ammonia water was added dropwise to the solution until the pH value was adjusted to 7. After the gel is formed, put the gel into an oven and dry it at 115°C for 48 hours. Then it is calcined at two stages of temperature: 500° C. for 4 hours, and 800° C. for 2.5 hours to prepare the oxide composition catalyst of cerium and copper.

[0026] Due to Ce 3+ The oxide is partially oxidized to Ce during the calcination process 4+ Oxide, Cu 2+ The oxide is partially reduced to Cu during the calcination process + Oxide, for the convenience of expression, the prep...

Embodiment 2

[0030] Embodiment two: Zr 0.6 Ce 0.4 CuO 3-λ The catalytic effect of the catalyst

[0031] Zr(NO 3 ) 4 ·5H 2 O, Ce(NO 3 ) 3 ·6H 2 O and Cu(NO 3 ) 2 ·3H 2 O is added to deionized water, and Zr is obtained by the method of Example 1 0.6 Ce 0.4 CuO 3-λ Catalyst, and test activity under the activity evaluation condition of embodiment one. The conversion rates of HC, CO and NO on this catalyst are as follows:

[0032]

[0033] Visible, from the above Zr 0.6 Ce 0.4 CuO 3-λ Catalyst purification treatment simulates lean-burn motor vehicle exhaust. CO can be completely removed at 250-350°C, NO can be basically removed at 300-350°C, and HC removal effect exceeds 60%.

Embodiment 3

[0034] Embodiment three: Zr 0.8 Ce 0.2 CuO 3-λ The catalytic effect of the catalyst

[0035] Zr(NO 3 ) 4 ·5H 2 O, Ce(NO 3 ) 3 ·6H 2 O and Cu(NO 3 ) 2 ·3H 2 O is added to deionized water, and Zr is obtained by the method of Example 1 0.8 Ce 0.2 CuO 3-λ Catalyst, and test activity under the activity evaluation condition of embodiment one. The conversion rates of HC, CO and NO on this catalyst are as follows:

[0036]

[0037] Visible, from the above Zr 0.8 Ce 0.2 CuO 3-λ Catalyst purification treatment simulates lean-burn motor vehicle exhaust, CO can be basically removed at 250-350°C, and NO can be removed by more than 78% at 300-350°C.

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J23/83B01D53/94B01D53/56B01D53/62B01D53/72
CPCY02T10/22Y02A50/20Y02T10/12
Inventor 郭锡坤贾海建范倩玉
Owner SHANTOU UNIV
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