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Pt@ZrO2 photo-thermal catalyst with hollow core-shell mesoporous structure, and preparation method and application thereof

A core-shell mesoporous and catalyst technology, which is applied in the field of catalytic materials and environmental protection, can solve the problems of limited application, and achieve the effects of convenient operation, promotion of photothermal catalytic reaction, and mild preparation conditions

Active Publication Date: 2018-09-28
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported that the inorganic shell wraps metal particles to prevent particle aggregation, but the dense and thick shell makes it difficult for reaction molecules to access the wrapped catalytic active centers, which limits the application of this structure in the field of catalysis.

Method used

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  • Pt@ZrO2 photo-thermal catalyst with hollow core-shell mesoporous structure, and preparation method and application thereof
  • Pt@ZrO2 photo-thermal catalyst with hollow core-shell mesoporous structure, and preparation method and application thereof
  • Pt@ZrO2 photo-thermal catalyst with hollow core-shell mesoporous structure, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) 10mg H 2 PtCl 6 .6H 2 O, 30ml of deionized water, 60mg of sodium citrate were mixed in a 100ml three-necked flask, stirred and refluxed at 80°C for 4h, and 0.1g of PVP was added after cooling to obtain monodisperse Pt metal nanoparticles; (2) Take 20ml of Pt nanoparticle solution and ultrasonic Disperse in 50ml ethanol solution, slowly add 25wt% ammonia water under rapid stirring to adjust the pH to 10-11, then add 0.5ml tetraethyl orthosilicate, stir at room temperature for 12h, centrifuge, wash with pure water and ethanol three times alternately, and re- Disperse in 100ml of ethanol solution for use; (3) Take 30ml of the solution in step (2), 1ml of deionized water, mix and stir evenly, add 0.5ml of zirconium tetra-n-butoxide, stir for 8h, age for 12h, centrifuge, put Dry at constant temperature in an oven at 60°C for 10 hours to obtain SiO-containing 2 Pt@ZrO 2 powder; (4) ultrasonically disperse the powder in step (3) in NaOH solution and stir at room temper...

Embodiment 2

[0025] (1) 10mg H 2 PtCl 6 .6H 2 O, 30ml of deionized water, 60mg of sodium citrate were mixed in a 100ml three-necked flask, stirred and refluxed at 80°C for 4h, and 0.1g of PVP was added after cooling to obtain monodisperse Pt metal nanoparticles; (2) Take 20ml of Pt nanoparticle solution and ultrasonic Disperse in 50ml ethanol solution, slowly add 25wt% ammonia water under rapid stirring to adjust the pH to 10-11, then add 0.5ml tetraethyl orthosilicate, stir at room temperature for 12h, centrifuge, wash with pure water and ethanol three times alternately, and re- Disperse in 100ml of ethanol solution for use; (3) Measure 30ml of the solution in step (2), 1ml of deionized water, mix and stir evenly, add 0.5ml of zirconium tetra-n-butoxide, stir for 8h, age for 24h, centrifuge, put Put it into a 60°C oven for 10 hours to dry it at a constant temperature to obtain SiO-containing 2 Pt@ZrO 2powder; (4) ultrasonically disperse the powder in step (3) in NaOH solution and stir...

Embodiment 3

[0027] (1) 10mg H 2 PtCl 6 .6H 2 O, 30ml of deionized water, 60mg of sodium citrate were mixed in a 100ml three-neck flask, stirred and refluxed at 80°C for 4h, and 0.2g of PVP was added after cooling to obtain monodisperse Pt metal nanoparticles; (2) Take 20ml of Pt nanoparticle solution and ultrasonic Disperse in 50ml ethanol solution, slowly add 25wt% ammonia water under rapid stirring to adjust the pH to 10-11, then add 0.5ml tetraethyl orthosilicate, stir at room temperature for 12h, centrifuge, wash with pure water and ethanol three times alternately, and re- Disperse in 100ml of ethanol solution for use; (3) Take 30ml of the solution in step (2), 1ml of deionized water, mix and stir evenly, add 0.5ml of zirconium tetra-n-butoxide, stir for 8h, age for 24h, centrifuge, put Dry at constant temperature in an oven at 60°C for 10 hours to obtain SiO-containing 2 Pt@ZrO 2 powder; (4) ultrasonically disperse the powder in step (3) in NaOH solution and stir at room temperat...

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PUM

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Abstract

The invention discloses a Pt@ZrO2 photo-thermal catalyst with a hollow core-shell mesoporous structure, and a preparation method and an application thereof. The Pt@ZrO2 photo-thermal catalyst is prepared by embedding Pt nanoparticles into the interiors of hollow ZrO2 nanoparticles, wherein the weight percentage content of Pt is 0.1% to 0.5% on the basis that the weight percentage content of the catalyst is 100%. The preparation method comprises the following steps: (1) dissolving H2PtCl6.6H2O into purified water, adding sodium citrate as a reducing agent, then adding a surfactant, carrying outrefluxing at a high temperature, and carrying out cooling; (2) adding tetraethoxysilane and ammonia water, carrying out uniform mixing under stirring so as to form a suspension, carrying out centrifuging and washing, and carrying out redispersing in ethanol for subsequent usage; (3) adding zirconium n-butoxide to coat zirconium dioxide, and carrying out stirring, aging, centrifuging, washing anddrying; and (4) carrying out etching with an excess NaOH solution, and carrying out centrifuging, washing, drying and calcining. The Pt@ZrO2 photo-thermal catalyst provided by the invention has the following advantages: the preparation method is simple; photo-thermal catalytic oxidation of an organic pollutant is realized under the condition of 100 to 200 DEG C; the Pt@ZrO2 photo-thermal catalystremains basically unchanged activity after continuous and cyclic application for 30 times or above; and the Pt@ZrO2 photo-thermal catalyst has the characteristics of high efficiency, stability, recyclability and easy recovery.

Description

technical field [0001] The invention relates to the technical field of catalytic materials and environmental protection, in particular to a Pt@ZrO with hollow core-shell mesoporous structure 2 Photothermal catalyst and its preparation method and application. Background technique [0002] In recent years, with the gradual improvement of people's living standards and quality, more and more attention has been paid to the effective elimination of VOCs and other volatile organic compounds. Among them, the photothermal catalytic oxidation method can completely oxidize organic pollutants such as toluene into CO 2 and H 2 O, has become one of the most effective and environmentally friendly technologies for purifying volatile organic pollutants, and the development of efficient and stable catalytic materials is the key issue to enhance the competitiveness of this technology. At present, the highly active catalysts for photothermal catalytic oxidation of VOCs are mainly noble metals...

Claims

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Application Information

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IPC IPC(8): B01J23/42B01J35/10B01D53/86B01D53/72B01D53/44
CPCB01D53/005B01D53/007B01D53/8668B01D53/8687B01J23/42B01D2257/708B01D2257/704B01D2257/7027B01D2259/802B01J35/398B01J35/39
Inventor 纪红兵江春立王永庆鲜丰莲
Owner SUN YAT SEN UNIV
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