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Mesoporous La0.8Sr0.2CoO3 loaded nanometer CeO2 catalyst as well as preparation method and application thereof

A catalyst and mesoporous technology, applied in the field of oxide-supported catalysts, can solve the problems that harmful components of cold-start exhaust gas cannot be well treated, limit the practical application of catalysts, and deactivate catalysts, and achieve good low-temperature catalytic activity and thermal stability. properties, improving low-temperature catalytic activity, and simple preparation process

Active Publication Date: 2016-11-30
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, automobile exhaust catalysts are mainly divided into noble metal catalysts and non-precious metal catalysts. The existing problems are: (1) Most of the current catalysts have good high-temperature activity, but poor low-temperature activity, and the harmful components of cold-start exhaust gas cannot be well treated.
(2) Catalysts for automotive applications are still mainly metal oxides doped or supported by noble metals, and the cost is still high
(3) The deactivation problem of the catalyst is serious, including thermal deactivation and S, Pb poisoning deactivation, these problems greatly limit the practical application of the catalyst, therefore, the preparation of high low temperature activity, good high temperature stability and strong poisoning resistance Catalysts for purification of automobile exhaust gas become an urgent problem to be solved
However, there are no literature and patent reports at home and abroad, and nano-CeO 2 Loading onto large specific surface area mesoporous La under hydrothermal conditions 0.8 Sr 0.2 CoO 3 Above and its application in the treatment of CO in automobile exhaust

Method used

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  • Mesoporous La0.8Sr0.2CoO3 loaded nanometer CeO2 catalyst as well as preparation method and application thereof
  • Mesoporous La0.8Sr0.2CoO3 loaded nanometer CeO2 catalyst as well as preparation method and application thereof
  • Mesoporous La0.8Sr0.2CoO3 loaded nanometer CeO2 catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Preparation of mesoporous La with large specific surface area 0.8 Sr 0.2 CoO 3 ,Specific steps are as follows:

[0053] 1) Take a clean beaker, pour 200ml deionized water, add 0.016mol La(NO 3 ) 3 ·6H 2 O, 0.004mol Sr(NO 3 ) 2 , 0.02mol Co(NO 3 ) 2 ·6H 2 O, stir to dissolve, add 0.03mol citric acid monohydrate to the above-mentioned nitrate solution, stir to dissolve, magnetically stir for 12 hours at room temperature, and record it as solution A.

[0054] 2) Take another clean beaker, pour 200ml of deionized water into it, add 0.03mol of citric acid monohydrate and stir to dissolve, then add 2.4g (equivalent to 0.04mol) of SBA-15, sonicate for 15min, stir magnetically at room temperature for 12h, record it as a solution B; The template agent SBA-15 used in this example is prepared according to the literature (P.D.Yang, D.Y Zhao, et.al.Nature, 1998, 396:152~155), and the specific surface area is 840m 2 / g, the pore diameter is 6nm, the pore volume is 1.08cm ...

Embodiment 2

[0061] Only to the catalyst La that embodiment 1 makes 0.8 Sr 0.2 CoO 3 Perform hydrothermal treatment without loading CeO 2 ,Specific steps are as follows:

[0062] 1) Weigh 3.2g NaOH and dissolve it in 80ml deionized water, stir and dissolve at room temperature to obtain a NaOH solution with a concentration of 1mol / L, add 1.2g of the mesoporous La in Example 1 0.8 Sr 0.2 CoO 3 Stir well, and ultrasonically disperse for 30 minutes to obtain a dispersion;

[0063] 2) Put the dispersion liquid obtained in step 1) in a reaction kettle, conduct a hydrothermal reaction at 100°C for 24 hours, take out, filter, wash until neutral, and dry at 80°C for 12 hours to obtain a solid;

[0064] 3) The solid obtained in step 2) is ground; in a muffle furnace, the heating rate is raised to 400° C. for 2 hours at a rate of 2° C. / min, and a black powder product is obtained, that is, La 0.8 Sr 0.2 CoO 3 .

[0065] figure 1 The middle B curve is the mesoporous La obtained in this example...

Embodiment 3

[0068] Preparation of 10% CeO 2 / La 0.8 Sr 0.2 CoO 3 ,Specific steps are as follows:

[0069] 1) Weigh 0.3gCe(NO 3 ) 3 ·6H 2 O was dissolved in 10ml of deionized water, 3.2g of NaOH was weighed and dissolved in 50ml of deionized water, and the two solutions were mixed and stirred for 15min; then 1.2g of the mesoporous La prepared in Example 1 was added 0.8 Sr 0.2 CoO 3 Stir well, ultrasonic 1h to get the dispersion, add 20ml of deionized water to the dispersion, so that the concentration of NaOH is diluted to 1mol / L;

[0070] 2) Transfer the dispersion liquid into a reaction kettle, conduct a hydrothermal reaction at 100°C for 24 hours, take out the solid, filter, wash, and dry at 100°C for 8 hours to obtain a solid;

[0071] 3) Grind the solid obtained in step 2), and raise the temperature in a muffle furnace to 400°C at a rate of 2°C / min for 2 hours to obtain a black powder of 10% CeO 2 / La 0.8 Sr 0.2 CoO 3 .

[0072] figure 1 Middle C curve is the 10%CeO that...

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Abstract

The invention relates to a mesoporous La0.8Sr0.2CoO3 loaded nanometer CeO2 catalyst as well as a preparation method and an application thereof. According to the mesoporous La0.8Sr0.2CoO3 loaded CeO2 catalyst disclosed by the invention, mesoporous perovskite La0.8Sr0.2CoO3 with a high specific surface area is used as a carrier, a cerium nitrate solution is used as a cerium source, and under alkaline conditions, CeO2 is loaded on the surface of mesoporous La0.8Sr0.2CoO3 by a hydrothermal method so that a loaded type catalyst is obtained. The preparation method comprises the specific steps of (1) performing mixing and hydrothermal loading on La0.8Sr0.2CoO3 which is used as a carrier and has a large specific surface area, and the cerium nitrate solution under the alkaline conditions for some time; and (2) washing the obtained mixture, filtering the washed mixture, drying the filtered mixture, and roasting the dried mixture so as to obtain a loaded type perovskite catalyst, wherein the La0.8Sr0.2CoO3 with the high specific surface area can be synthesized by using mesoporous SiO2 as a hard template. The mesoporous La0.8Sr0.2CoO3 loaded nanometer CeO2 catalyst as well as the preparation method and the application thereof disclosed by the invention have the advantages that the preparation method is simple, the cost of the mesoporous La0.8Sr0.2CoO3 loaded nanometer CeO2 catalyst is lower than that of a noble metal catalyst, all components in the catalyst are uniformly dispersed and interact, the growth of crystal grains is restrained, the obtained loaded type catalyst has good low temperature catalytic activity and good heat stability on oxidation of CO in the automobile tail gas, and the mesoporous La0.8Sr0.2CoO3 loaded nanometer CeO2 catalyst has good application prospects in the respects of treatment and purification of the automobile tail gas.

Description

technical field [0001] The present invention relates to a kind of mesoporous La 0.8 Sr 0.2 CoO 3 Loaded Nano CeO 2 The catalyst, its preparation method and its application in automobile tail gas purification belong to the field of oxide-loaded catalysts. Background technique [0002] Automobile exhaust pollutes the atmospheric environment and endangers people's health. The country's standards for motor vehicle exhaust emissions are getting higher and higher, and the treatment of automobile exhaust has become an urgent problem to be solved. In the emission cycle test, according to the FTP-75 test of the U.S. Environmental Protection Agency, nearly 80% of the CO, CH x It is generated in the first 200s of the cold start of the car (the process of warming up the car). At present, automobile exhaust catalysts are mainly divided into noble metal catalysts and non-precious metal catalysts. The existing problems are as follows: (1) Most of the current catalysts have good high-t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J32/00B01J35/10B01D53/94
CPCB01D53/94B01J23/002B01J23/83B01D2258/01B01D2256/20B01J2523/00B01J35/39B01J35/613B01J35/615B01J2523/24B01J2523/3706B01J2523/3712B01J2523/845
Inventor 黄学辉商晓辉牛鹏举李正晔杨银波窦世静
Owner WUHAN UNIV OF TECH
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