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Noble metal-rare-earth catalyst for purifying waste gas and its preparation

An exhaust gas purification and catalyst technology, which is applied in the field of automobile exhaust gas purification, can solve the problems such as the need to improve the anti-lead poisoning performance, the high content of precious metals in the catalyst, and increase the economic cost, so as to achieve excellent exhaust gas purification performance, promote conversion efficiency, and improve collision probability. Effect

Inactive Publication Date: 2004-02-11
昆明贵研催化剂有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst has high noble metal content, which increases the economic cost, and its anti-lead poisoning performance needs to be improved, and its adaptability to gasoline with high sulfur and olefin content is narrow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 10kg Al(NO 3 ) 3 , 3.8kg La(NO 3 ) 3 ·6H 2 O and 3.8kg Ce(NO 3 ) 3 ·6H 2 O, dissolved in 200 L of deionized water with constant stirring until completely dissolved. Slowly add 35 wt% NH with constant stirring 4 OH aqueous solution, to a pH value of about 10.0, resulting in a precipitate. After aging the precipitate for 24 hours, it was filtered and rinsed with deionized water 5 times. The filter cake was calcined at 500° C. for 3 hours to obtain mixed metal oxides. Calculated according to the oxides of aluminum, cerium, and lanthanum, the ratio relationship of the co-precipitation reaction is: CeO 2 :(CeO 2 +La 2 o 3 )=0.514:1, (CeO 2 +La 2 o 3 ): (Al 2 o 3 +CeO 2 +La 2 o 3 )=0.552:1. The coprecipitation reaction ratio relationship is obtained by the following conversion: W (kg) Al2O3 =W(kg) Al(NO3)3 ×MW Al2O3 / 2MW Al(NO3)3 =10kg×102 / 426=2.39kgW(kg) La2O3 =W(kg) La(NO3)3·6H2O ×MW La2O3 / 2MW La(NO3)3·6H2O =3.8kg×326 / 866=1.43kgW(kg) C...

Embodiment 2

[0036] Weigh 1.8kg Al(NO 3 ) 3 , 0.7kg La(NO 3 ) 3 ·6H 2 O and 0.7kg Ce(NO 3 ) 3 ·6H 2 O, dissolved in 200 L of deionized water with constant stirring until completely dissolved. Slowly add 35 wt% NH with constant stirring 4 OH aqueous solution, to a pH value of about 10.0, resulting in a precipitate. After aging the precipitate for 24 hours, it was filtered and rinsed with deionized water 5 times. The filter cake was calcined at 700° C. for 3 hours to obtain mixed metal oxides. Measured by the oxides of aluminum, cerium, and lanthanum, the proportioning relationship of the co-precipitation reaction is: W Al2O3 0.43kg, W La2O3 0.26kg, W CeO2 0.28kg, CeO 2 :(CeO 2 +La 2 o 3 )=0.52:1, (CeO 2 +La 2 o 3 ): (Al 2 o 3 +CeO 2 +La 2 o 3 )=0.56:1.

[0037] The above co-precipitated mixed metal oxide and stabilizer ZrO 2 Mix directly with BaO, then add water and wet grind to make a slurry, and apply the slurry on the honeycomb ceramic carrier according to th...

Embodiment 3

[0040] Weigh 144.5kg Al(NO 3 ) 3 , 15.2kg La(NO 3 ) 3 ·6H 2 O and 23 kgCe(NO 3 ) 3 ·6H 2 O, dissolved in 200 L of deionized water with constant stirring until completely dissolved. Slowly add 35 wt% NH with constant stirring 4 OH aqueous solution, to a pH value of about 10.0, resulting in a precipitate. After aging the precipitate for 24 hours, it was filtered and rinsed with deionized water 5 times. The filter cake was calcined at 600° C. for 3 hours to obtain mixed metal oxides. Measured by the oxides of aluminum, cerium, and lanthanum, the proportioning relationship of the co-precipitation reaction is: W Al2O3 34.6kg, W La2O3 5.72kg, W Ceo2 9.11kg, CeO 2 :(CeO 2 +La 2 o 3 )=0.62:1, (CeO 2 +La 2 o 3 ): (Al 2 o 3 +CeO 2 +La 2 o 3 )=0.3:1.

[0041] According to the process in Example 1, the co-precipitated mixed metal oxide was made into slurry and coated on the honeycomb ceramic carrier. Using the method of Example 1, the coating weight:carrier we...

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Abstract

The catalyst includes alumina, RE metal oxide, composite Al-La oxide, and active metal Pt, Pd and Rh. It features that the mixed oxide grain with aluina, cerium oxide and Al-La oxide carries at least one of Pt and Pd as well as Rh. The mixed oxide grain is prepared through dissolving salt of Al, Ce and La in water, adding NH3OH to produce precipitate, and heating to decompose the precipitate. The catalyst preparing process includes carrying mixed oxide grains onto the carrier, carrying least one of Pt and Pd onto the mixed oxide grains, and carrying Rh finally. The catalyst is especially suitable for purifying automobile tail gas of gasoline engine near the theoretical air / fuel ratio, and has the features of lasting use, less noble metal consumption, high purifying efficiency and powerful sulfur poison resistance.

Description

technical field [0001] The invention relates to a noble metal-rare earth oxide waste gas purification catalyst and a preparation method thereof, which is especially suitable for purifying automobile tail gas near the theoretical air-fuel ratio of a gasoline engine. Background technique [0002] Vehicle exhaust is an important source of pollution to the atmospheric environment. The catalyst is applied to the automobile exhaust purification system to make the carbon monoxide CO, hydrocarbon HC and nitrogen oxide NO produced during the engine work x The conversion to the harmless gases carbon dioxide, water vapor and nitrogen remains an important topic in the field of catalysis now and in the future. When a gasoline engine operates at a stoichiometric air-fuel ratio or a slightly lower air-fuel ratio, such as between 14.7 and 14.4, a catalyst containing precious metals such as rare earth, platinum, palladium and rhodium can effectively convert the above three gases simultaneou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/94B01J23/46B01J23/63B01J37/02
Inventor 贺小昆黄荣光卢军杨冬霞桓源峰台继明张爱敏张云峰白屏刘沁曦吴乐刚栾浩
Owner 昆明贵研催化剂有限责任公司
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