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Cerium-zirconium-barium-copper oxide catalyst for purifying tail gas of lean-burn engine and preparation method thereof

A lean-burn engine, copper oxide technology, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low copper content, unsatisfactory treatment effect, Reduce NO conversion temperature and other issues to achieve good high temperature aging resistance

Inactive Publication Date: 2010-04-21
SHANTOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Chinese patent publication CN101024182A discloses a copper cerium soot removal catalyst and a preparation method thereof, using soluble cerium salts and copper salts as raw materials, citric acid as a complexing agent, and a small amount of polyethylene glycol as a thickener, using sol- The general formula is Cu x Ce 1-x o 2-x (x=0.03~0.2) catalyst, in the presence of the catalyst, the CO in the tail gas of the simulated diesel vehicle oxygen-enriched combustion can be basically removed, and the combustion temperature of the soot is reduced to 320~420°C. Low content, low catalytic activity, no treatment effect on HC and NO
The combustion temperature of this technical solution is still high, and the treatment effect on HC and NO is not ideal
[0008] The three-way catalyst disclosed in CN101474553A contains oxides of cerium, zirconium and copper, which can significantly reduce the conversion temperature of NO, HC and CO, and has a three-way catalytic purification effect. The removal temperature of CO is above 200°C, and the removal temperature of NO The removal temperature is 300-350°C, but the removal effect of HC at 300-350°C is only 60-70%, and it is still necessary to further improve the removal effect of HC

Method used

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  • Cerium-zirconium-barium-copper oxide catalyst for purifying tail gas of lean-burn engine and preparation method thereof
  • Cerium-zirconium-barium-copper oxide catalyst for purifying tail gas of lean-burn engine and preparation method thereof
  • Cerium-zirconium-barium-copper oxide catalyst for purifying tail gas of lean-burn engine and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Ce 7 Zr 28 Ba 1 Cu 1.25 The catalytic effect of the catalyst

[0021] 0.00583mol of Ce(NO 3 ) 3 ·6H 2 O, 0.0233mol of Zr(NO 3 ) 4 ·5H 2 O and 0.000833mol of Ba(NO 3 ) 2 Soluble in water to form Ce 3+ 、Zr 4+ and Ba 2+ A cation solution with a molar ratio of 7:28:1 and a total cation concentration of 0.2mol / L.

[0022] Weigh 0.05mol of NH 4 HCO 3 Solid, dissolved in water to form a 0.2mol / L aqueous solution, and heated in a constant temperature water bath at 35°C, and the cationic solution was added dropwise with stirring at a rate of 10ml / min. After the dropwise addition was completed, the reaction was continued for two hours to complete the reaction. Then it was aged at room temperature for 18 hours, and the solid obtained by filtering was dried at 110°C for 11 hours, ground, and calcined at 700°C for 2 hours to obtain the Ce-Zr-Ba composite oxide. According to X-ray diffraction analysis, the Ce-Zr-Ba composite oxide forms a solid solution s...

Embodiment 2

[0028] Example 2: Ce 5.5 Zr 22 Ba 1 Cu 1 The catalytic effect of the catalyst

[0029] Ce(NO 3 ) 3 ·6H 2 O, Zr(NO 3 ) 4 ·5H 2 O, Ba(NO 3 ) 2 and Cu(NO 3 ) 2 ·3H 2 O, NH 4 HCO 3 The number of moles is Ce(NO 3 ) 3 ·6H 2 O, Zr(NO 3 ) 4 ·5H 2 O and Ba(NO 3 ) 2 2 times of the sum of the number of moles, the Ce, Zr, Ba and Cu oxide mol ratios are 5.5: 22: 1: 1 obtained by the operation steps of Example 1 5.5 Zr 22 Ba 1 Cu 1 Catalyst, test activity under the activity evaluation condition of embodiment 1. The conversion rates of HC, CO and NO on the catalyst are as follows:

[0030]

[0031] Visible, by the above Ce 5.5 Zr 22 Ba 1 Cu 1 Catalyst purification treatment simulates lean-burn motor vehicle exhaust, and can basically remove HC (conversion rate above 80%) above 350°C, and can completely remove CO at the same time, and can also completely remove NO when it reaches 400-450°C.

Embodiment 3

[0032] Example 3: Ce 4.5 Zr 18 Ba 1 Cu 0.83 The catalytic effect of the catalyst

[0033] Ce(NO 3 ) 3 ·6H 2 O, Zr(NO 3 ) 4 ·5H 2 O, Ba(NO 3 ) 2 and Cu(NO 3 ) 2 ·3H 2 O, NH 4 HCO 3 The number of moles is Ce(NO 3 ) 3 ·6H 2 O, Zr(NO 3 ) 4 ·5H 2 O and Ba(NO 3 ) 2 2 times of the sum of the number of moles, the Ce, Zr, Ba and Cu oxide mol ratios are 4.5: 18: 1: 0.83 obtained by the operation steps of Example 1 4.5 Zr 18 Ba 1 Cu 0.83 Catalyst, and test activity under the activity evaluation condition of embodiment 1. The conversion rates of HC, CO and NO on the catalyst are as follows:

[0034]

[0035] Visible, by the above Ce 4.5 Zr 18 Ba 1 Cu 0.83 Catalyst purification treatment simulates lean-burn motor vehicle exhaust, HC and CO can be completely removed at 300-350°C, and NO can also be completely removed at 400-450°C.

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Abstract

The invention discloses a three-way catalyst for improving the processing effect of hydrocarbons (HC) in the tail gas of a lean-burn engine and being capable of purifying carbon monoxide (CO) and nitrogen oxide (NO) and a preparation method thereof. The catalyst contains oxides of cerium, zirconium, barium and copper, wherein the mol ratio of the cerium to the zirconium to the barium to the copper is (2-15):(5-40):1:(0.5-1.5). Water-soluble cerate, zirconium salt and barium salt form an aqueous solution composition which is dropwise added into precipitator aqueous solution; solid substances are dried, ground and roasted at a temperature between 500 DEG C and 800 DEG C to obtain cerium-zirconium-barium oxide; the cerium-zirconium-barium oxide is impregnated into copper slat aqueous solution; and the mixture is dried and roasted at a temperature between 500 DEG C and 650 DEG C to obtain the catalyst. The invention can reduce the catalytic oxidation temperature of HC, has better high-temperature and ageing resistant performances and can be used for an exhaust system of the lean-burn engine to eliminate the pollution of HC, CO and NO on the environment.

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, hydrocarbon compounds (HC), carbon monoxide (CO) 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 I to Euro V, 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): B01J23/83B01D53/94B01D53/72B01D53/62B01D53/56B01D53/86
CPCY02A50/20
Inventor 郭锡坤彭桂芳陈耀文
Owner SHANTOU UNIV
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