A nitrogen-doped graphene-confined Pt nanocomposite material and its preparation method and application

A technology of nitrogen-doped graphene and nanocomposite materials, applied in separation methods, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as fuel cell electrode poisoning, achieve increased electron density, simple preparation methods, The effect of mature production technology

Active Publication Date: 2022-05-17
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in the research of fuel cells, the presence of CO will not only compete with hydrogen for the reaction with oxygen, but also cause electrode poisoning of fuel cells.

Method used

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  • A nitrogen-doped graphene-confined Pt nanocomposite material and its preparation method and application
  • A nitrogen-doped graphene-confined Pt nanocomposite material and its preparation method and application
  • A nitrogen-doped graphene-confined Pt nanocomposite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Preparation of a nitrogen-doped graphene-confined Pt nanocomposite CN@Pt / GO

[0027] (1) The preparation method is as follows:

[0028] 1. Preparation of Pt / GO

[0029] Weigh 200mg of graphene, put it into 40mL of ethylene glycol solution, and ultrasonicate for 3-10min to make the graphene evenly dispersed. Then add 1.325mL chloroplatinic acid solution, adjust the pH of the mixed solution to 12, react at a constant temperature of 130°C for 3h, cool to room temperature after the reaction, adjust the pH of the mixed solution to 3, filter the precipitate and wash it with deionized water, and place it in 60- Dry overnight in an oven at 70°C to obtain graphene-supported Pt nanoparticle composites, denoted as Pt / GO.

[0030] 2. Preparation of CN@Pt / GO

[0031] 1) Put 50mg Pt / GO in the alumina crucible, put 0.5mL acetonitrile in the porcelain boat, put Pt / GO and acetonitrile into two tube furnaces at the same time, and the two tube furnaces are connected by quartz...

Embodiment 2

[0035] Example 2 Application of CN@Pt / GO in catalytic CO oxidation reaction

[0036] Methods as below:

[0037] 1) Place CN@Pt / GO in H 2 atmosphere, H 2 The flow rate is 30mL / min, and the in-situ reduction is performed at 200°C for 1h.

[0038] 2) In the reaction vessel, 50 mg of CN@Pt / GO after in situ reduction treatment was added as a catalyst, and the process was carried out in a temperature-programmed manner under ambient pressure with a heating rate of 2°C / min. With He as the balance gas, the gas reactant contains 1vol% CO and 1vol% O 2 , passed into the reaction vessel containing the catalyst at a flow rate of 15mL / min, and catalyzed the oxidation of CO to CO at a temperature of 30-200°C under ambient pressure 2 . As a comparison, Pt / GO is added as a catalyst in another reaction vessel, the method is the same as above, and the oxidation of CO to CO is catalyzed. 2 .

[0039] 3) Detection, reactants and products were analyzed online by gas chromatography (Agilent 789...

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Abstract

The invention discloses a nitrogen-doped graphene-confined Pt nanocomposite material, a preparation method and an application thereof. The nitrogen-doped graphene-confined Pt nanocomposite is CN@Pt / GO; firstly, Pt nanoparticles are directly loaded on graphene by wet chemical reduction method to obtain Pt / GO; then, by CVD method, the Pt / GO prepared by rapidly depositing a nitrogen-doped graphene layer on the surface of Pt nanoparticles. The CN@Pt / GO prepared by the present invention exhibits better catalytic performance for low-temperature oxidation of CO. Due to the confinement of Pt nanoparticles and graphene and nitrogen-doped graphene, the electron density of supported Pt nanoparticles is increased, and the desorption of CO is enhanced, so that the low-temperature catalytic performance of CN@Pt / GO for CO is better than that of Pt / GO. Thus, the CO low-temperature catalytic performance of the CN@Pt / GO catalyst was improved.

Description

technical field [0001] The invention belongs to the technical field of CO oxidation reaction catalysts, and in particular relates to the application of a nitrogen-doped graphene-confined Pt nanocomposite material as a CO oxidation reaction catalyst. Background technique [0002] As we all know, carbon monoxide is a typical toxic and combustible compound. The combustion of chemical fuels such as coal and petroleum and the use of motor vehicles will cause a large amount of CO emissions, which has now become a serious environmental pollution problem and has attracted widespread attention. The low-temperature elimination of CO has very important application value in many aspects, such as carbon monoxide detector materials, respiratory gas purification devices, reduction of tobacco hazards, and low-temperature elimination of trace CO in closed systems such as aircraft and spacecraft. prospect. In addition, in the research of fuel cells, the presence of CO will not only compete ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01D53/86B01D53/62B01D53/94
CPCB01J27/24B01D53/864B01D53/94B01D53/62B01D2257/502B01D2258/01Y02A50/20
Inventor 杨黎妮马召彬秦帅夏立新
Owner LIAONING UNIVERSITY
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