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Cerium-based core-shell structure catalyst and preparation method thereof

A core-shell structure and catalyst technology, which is applied in the field of catalysis, can solve problems such as unsatisfactory catalytic effect, poor thermal stability of the catalyst, and complicated steps, and achieve the effects of improving catalytic performance, increasing catalytic activity, and increasing the concentration of oxygen vacancies

Inactive Publication Date: 2018-09-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, overcome the complex steps of the existing control method, obtain the shortcomings of poor thermal stability of the catalyst, and unsatisfactory catalytic effect, and use laser to synthesize Ag@CeO 2 The core-shell structure greatly improves the oxygen vacancy concentration of the catalyst and the stability of the catalyst, and promotes the research of cerium-based catalysts, thereby further improving the catalytic activity and stability of the catalyst and reducing the emission of pollutants

Method used

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  • Cerium-based core-shell structure catalyst and preparation method thereof
  • Cerium-based core-shell structure catalyst and preparation method thereof
  • Cerium-based core-shell structure catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] In the first step, mix 40ml of glycerol and 10ml of distilled water to form a solution, add 0.18g of silver nitrate and 0.142g of sodium citrate, ultrasonically disperse, place in a 135°C oil bath, heat and stir at a constant temperature for 1h. Centrifuge, wash, and dry to obtain silver nanoparticles.

[0027] In the second step, 0.2171g of cerium nitrate and 0.1078g of silver nanoparticles were weighed and added to distilled water, 0.26g of citric acid was added, and the pH value was adjusted to 6.7 with 1mol / L of ammonia water to produce dispersion. Magnetic stirring, using the method of pulse laser action to act on the mixed solution for 1.5h, set the laser head perpendicular to the mixed solution (the laser target surface is 5mm away from the liquid surface), so that the laser acts on the mixed solution, and the obtained product is centrifuged and dried. The laser parameters are: power 10 6 w / cm 2 , voltage 720v, pulse width 10ms, frequency 10Hz, wavelength 523nm...

Embodiment 2

[0031] In the first step, mix 40ml of glycerol and 10ml of distilled water to form a solution, add 0.18g of silver nitrate and 0.142g of sodium citrate, ultrasonically disperse, place in a 135°C oil bath, heat and stir at a constant temperature for 1h. Centrifuge, wash, and dry to obtain silver nanoparticles.

[0032] In the second step, 0.4342g of cerium nitrate and 0.1078g of silver were weighed and added to distilled water, 0.26g of citric acid was added, and the pH value was adjusted to 6.7 with ammonia water to produce dispersion. Magnetic stirring was used to act on the mixed solution for 1.5 hours by means of pulsed laser action, and the obtained product was centrifuged and dried. The laser parameters are: power 10 6 w / cm 2 , voltage 720v, pulse width 10ms, frequency 10Hz, wavelength 523nm, energy 250mJ / cm 2 .

[0033] The third step is to use high-temperature sintering method to decompose nitrate to obtain catalyst product, sinter the above-mentioned completely dri...

Embodiment 3

[0036] In the first step, mix 40ml of glycerol and 10ml of distilled water to form a solution, add 0.18g of silver nitrate and 0.142g of sodium citrate, ultrasonically disperse, place in a 135°C oil bath, heat and stir at a constant temperature for 1h. Centrifuge, wash, and dry to obtain silver nanoparticles.

[0037] In the second step, 0.2171g of cerium nitrate and 0.1078g of silver were weighed and added to distilled water, 0.26g of citric acid was added, and the pH value was adjusted to 6.7 with ammonia water to produce dispersion. Magnetic stirring was used to act on the mixed solution for 1.5 hours by means of pulsed laser action, and the obtained product was centrifuged and dried. The laser parameters are: power 10 6 w / cm 2 , voltage 720v, pulse width 10ms, frequency 10Hz, wavelength 523nm, energy 350mJ / cm 2 .

[0038] The third step is to use high-temperature sintering method to decompose nitrate to obtain catalyst product, sinter the above-mentioned completely dri...

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Abstract

The invention discloses a cerium-based core-shell structure catalyst and a preparation method thereof, wherein the core-shell structure is synthesized by using pulsed laser. According to the present invention, through the interaction between cerium oxide and silver, the catalytic performance of the catalyst is enhanced, and the activity and the stability of the catalysis of the cerium-based catalyst on soot particulates are improved so as to reduce the emission of pollutants and reduce air pollution.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and more specifically relates to a cerium-based catalyst and a synthesis method thereof. Background technique [0002] Cerium oxide is a cheap and versatile material, widely used in luminescent materials, ultraviolet absorbing materials, catalysts, glass polishing, automobile exhaust purification catalysts, electronic ceramics and other fields. In recent years, with the rapid development and wide application of new rare earth materials, it has been discovered that nano-CeO 2 The powder has new excellent properties and applications, and the preparation, functional characteristics and application research of CeO2 nanomaterials have become research hotspots. [0003] Cerium oxide is easy to sinter at high temperature, which limits the application of cerium oxide as exhaust gas catalyst. Therefore, researchers use various methods to improve the catalytic activity of cerium oxide. Li Yadong et al....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/66
CPCB01J23/66B01J35/396B01J35/393B01J35/23
Inventor 龚彩荣司马晋强达毓敏范国樑
Owner TIANJIN UNIV
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