Automobile tail gas purification catalyst carrier and preparation method thereof

A technology for purifying catalysts and automobile exhaust gas, applied in the field of materials, can solve the problems of reduced specific surface area, pore volume oxygen storage and release capacity, failure to meet exhaust emission standards, poor mechanical mixing method, etc. Low impurity composition and good oxygen storage and release performance

Active Publication Date: 2019-03-26
KUNMING METALLURGY INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the mechanical mixing method has poor effect and is gradually eliminated; at present, the impregnation method is mainly used. When the exhaust gas temperature transiently reaches 800°C, the structure of this type of product will change to α-Al 2 o 3 , the specific surface area, pore volume, and oxygen storage and release capacity decrease, and the light-off temperature increases, which cannot effectively catalyze the conversion of NO, CO and incompletely combusted hydrocarbons into N 2 , CO 2 and H 2 O, not up to the exhaust emission standard; the sol-gel method is still in the stage of process research and development, and industrial production has not yet been realized

Method used

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  • Automobile tail gas purification catalyst carrier and preparation method thereof
  • Automobile tail gas purification catalyst carrier and preparation method thereof

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preparation example Construction

[0026] The preparation method of the vehicle exhaust gas purification catalyst carrier of the present invention is a two-step precipitation method, which specifically includes the following steps:

[0027] A. Using sodium aluminate or potassium aluminate as raw materials, nitric acid, modifier and surfactant as auxiliary materials, through co-precipitation, aging, filtration and washing to obtain modified aluminum hydroxide, and then drying, calcining and pulverizing to obtain modified aluminum hydroxide Alumina;

[0028] B. The modified aluminum hydroxide or modified alumina prepared in step A is used as the raw material, the modified aluminum hydroxide or alumina slurry containing the surfactant and the oxidant is used as the bottom liquid, and the precipitant and the modifier are sprayed together The precipitation temperature is -20 ℃ ~ 90 ℃, and the pH value of the precipitation is 7.0 ~ 12.5; after precipitation, the compound modified target is prepared by aging, filtrati...

Embodiment 1

[0038] 1) Prepare Al(OH) according to the patented catalyst carrier and preparation method (patent number: 201710094079.2) 3 :La 2 O 3 :Pr 6 O 11 =153:8:6 modified aluminum hydroxide;

[0039] 2) Prepare Al(OH) with a solid content of 40% 3 :La 2 O 3 :Pr 6 O 11 =153:8:6 modified aluminum hydroxide primer, with composite modified aluminum oxide (Al 2 O 3 :La 2 O 3 :Pr 6 O 11 : CeO2 :ZrO 2 =50:4:3:31:12) Add 8% of the mass of the surfactant ammonium polyacrylate into the primer, and add the oxidant H to 50% of the mass of the composite modified alumina 2 O 2 into the bottom material;

[0040] 3) Prepare CeO according to the ratio of composite modified alumina 2 :ZrO 2 = 72:28 rare earth modifier nitrate solution;

[0041] 4) Precipitate as Me(OH) by rare earth nitrate x 1.2x OH required - Ammonia solution is prepared according to the quantity, wherein the volume of rare earth nitrate solution is equal to the volume of precipitant solution;

[0042] 5) The ...

Embodiment 2

[0050] 1) Prepare Al according to the patented catalyst carrier and preparation method (patent number: 201710094079.2) 2 O 3 :ZrO 2 :Y 2 O 3 =95.5:3.3:1.2 modified alumina;

[0051] 2) Prepare Al with a solid content of 40% 2 O 3 :ZrO 2 :Y 2 O 3 = 95.5:3.3:1.2 modified alumina primer, compound modified alumina (Al 2 O 3 :ZrO 2 :Y 2 O 3 : CeO 2 =70:2.4:0.9:26.7) 8% by mass of PEG-2000 and 2% of cetyltrimethylammonium bromide, add oxidant H at 40% of the mass of composite modified alumina 2 O 2 into the bottom material;

[0052] 3) Prepare 26.7% CeO according to the ratio of composite modified alumina 2 The rare earth modifier nitrate solution;

[0053] 4) Precipitate as Me(OH) by rare earth nitrate x 1.2x OH required - The volume of the rare earth nitrate solution is equal to the volume of the precipitant solution;

[0054] 5) The modifier solution and the precipitant solution are sprayed into the primer in parallel, the precipitation temperature is 50 °C, ...

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Abstract

The invention discloses an automobile tail gas purification catalyst carrier and a preparation method thereof. The impurity Na content in the automobile tail gas purification catalyst carrier is lowerthan 400ppm; the apparent density is 1.8g / L or higher; the specific surface area at 950 DEG C at 2h is 110m<2> / g or higher; the pore volume is 0.4ml / g or higher. According to a preparation method, sodium aluminate / potassium aluminate are used as raw materials, and nitric acid, modification agents and surfactants are used as auxiliary materials; coprecipitation, aging, filtering washing, drying, roasting and crushing are performed; then, modified aluminum hydroxide or aluminum oxide is used as raw materials, surfactant and oxidizing agent containing modified aluminum hydroxide or aluminum oxide slurry is used as substrate materials; precipitators and modification agents are jointly sprayed into a bottom solution for precipitation; after the precipitation, aging, filtering washing, materialmixing, drying, roasting and crushing are performed to obtain the composite modified automobile tail gas purification catalyst carrier of composite modification aluminum oxide; the contents of impurities Na, S, P and the like are low; the requirements of the automobile tail gas purification agent carrier can be met.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a catalyst carrier for automobile exhaust purification and a preparation method thereof. Background technique [0002] Today, when the new energy vehicle industry is immature, has not yet been applied on a large scale and cannot be replaced by fossil fuel-powered vehicles, the world is facing increasingly serious problems of environmental pollution and energy shortages, and it is urgent to make more effective use of existing energy sources. , and reduce the generation of pollutants as much as possible. Automobiles are the largest user of oil consumption. NO, CO and incompletely burned hydrocarbon compounds (HC) produced by automobile exhaust are one of the important sources of environmental pollution in my country. [0003] Fossil energy brings civilization to mankind, but also brings environmental pollution and climate change. With the development of the automobi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/04B01J23/10B01J21/06B01J35/10B01J37/03B01J37/08B01J32/00B01D53/94
CPCB01D53/945B01J21/04B01J21/06B01J23/002B01J23/10B01J35/1019B01J35/1023B01J35/1028B01J35/1038B01J35/1042B01J35/1047B01J37/031B01J37/082
Inventor 郝红杰徐庆鑫彭建蓉车立志刘定民施辉献和晓才袁野晏华钎何清谢刚胥福顺赵加平黄源徐亚飞许娜李文明李永刚任玖阳谢桂炳杨德荣郝竞一朱杨昆张微陈映
Owner KUNMING METALLURGY INST
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