Preparation method of hollow carbon nanocage loaded platinum-based composite catalysts

A composite catalyst and nanoparticle technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of difficult batch preparation, limited application, etc. Narrow diameter distribution, good dispersion, good catalytic activity and stability

Inactive Publication Date: 2012-07-25
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] It is worth noting that the carbon nanocages involved in the above two inventions use a relatively complicated process and are difficult to prepare in batches, which limits their application

Method used

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  • Preparation method of hollow carbon nanocage loaded platinum-based composite catalysts
  • Preparation method of hollow carbon nanocage loaded platinum-based composite catalysts
  • Preparation method of hollow carbon nanocage loaded platinum-based composite catalysts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh 50 mg 670 o C Preparation of carbon nanocages uniformly dispersed in 50 ml of ethylene glycol solution of chloroplatinic acid and ruthenium chloride, wherein the contents of Pt and Ru were 7.5 and 4.0 mg (molar ratio 1:1), under the protection of argon Stir for 3 hours, then heat up to 140 °C, react for 3 hours, filter and wash, dry at 110 °C to obtain Pt 1.0 Ru 1.0 / CNCs catalyst (see figure 2 , image 3 ). Platinum ruthenium nanoparticles have a good degree of dispersion, narrow particle size distribution, and a size of 1-10 nm.

[0038]

Embodiment 2

[0040] Weigh 50 mg of carbon nanocages and uniformly disperse them in 50 ml of ethylene glycol solution of potassium chloroplatinate and potassium chlororuthenate, in which the contents of Pt and Ru are 7.5 and 2.0 mg (molar ratio is 1:0.5), respectively. Stir for 3 hours under nitrogen protection, then heat up to 100 °C, react for 5 hours, filter and wash, and dry at 110 °C to obtain Pt 1.0 Ru 0.5 / CNCs catalyst. Platinum ruthenium nanoparticles have a good degree of dispersion, narrow particle size distribution, and a size of 1-10 nm.

[0041]

Embodiment 3

[0043] Weigh 50 mg 700 o C Preparation of carbon nanocages uniformly dispersed in 50 ml of ethylene glycol solution of platinum acetate and potassium chlororuthenate, in which the contents of Pt and Ru were 7.5 and 8.0 mg (molar ratio 0.5:1), under the protection of argon Stir for 3 hours, then raise the temperature to 180°C, react for 1 hour, filter and wash, and dry at 110°C to obtain Pt 0.5 Ru 1.0 / CNCs catalyst. Platinum ruthenium nanoparticles have a good degree of dispersion, narrow particle size distribution, and a size of 1-10 nm.

[0044]

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Abstract

The invention relates to a preparation method of hollow carbon nanocage loaded platinum-based composite catalysts, which includes the following steps of dispersing hollow carbon nanocages into solution containing platinum ions and reducing by the aid of a reducing agent so as to obtain the hollow carbon nanocage loaded platinum-based composite catalysts. The mass ratio of the platinum-based nano particles to the hollow carbon nanocages is 0.005-1, namely the metal particles accounts for 0.5-50% of the total mass of the catalyst. The mole ratio of platinum ions to other metal ions is a:b, wherein the a is equal to 0-1 but not equal to 0, and the b is equal to 0-1. The M is one of Ru, Fe, Co, Ni or Cu or a mixture of two or more of Ru, Fe, Ni or Cu according to any proportion. The hollow carbon nanocage loaded platinum-based composite catalysts prepared by the method and in the size ranging from 1nm to 15nm are good in dispersion degree and small in range of particle size distribution, can be used for proton exchange membrane fuel cells and direct-methanol fuel cells, can also be applicable to chemical reaction catalyzed by other platinum-based catalysts, and have excellent catalytic activity and stability.

Description

[0001] technical field [0002] The invention relates to a method for preparing a catalyst in the technical field of low-temperature fuel cells, in particular to a method for preparing a platinum-based nanoparticle composite catalyst supported by a hollow-seeded carbon nano-cage. [0003] Background technique [0004] Direct methanol fuel cells have the advantages of simple structure, high fuel specific energy, and easy fuel storage and transportation, and are one of the fuel cells suitable for transportation, mobile communications, hospitals and other fields (Baldauf M. , 84, 161; Andrian S. V. et al., J. Power Source 2000, 91, 193.). Under the dual pressure of environmental protection and energy crisis, DMFC, which has attractive commercialization prospects, has attracted more and more researchers and international companies. The slow anodic oxidation reaction rate of methanol is one of the main problems restricting the development of methanol fuel cells. At present, du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/46B01J23/89
Inventor 王喜章钱敏杰蒋湘芬吴强杨立军胡征
Owner NANJING UNIV
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