Supported transition metal or transition metal alloy nanocluster catalyst and preparation method and application thereof

A transition metal and alloy nanotechnology, applied in metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as unfavorable environmental protection and noble metal nanocluster aggregation. , to achieve the effect of easy control of structure, high availability and high dispersion

Inactive Publication Date: 2010-03-17
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This catalytic preparation method uses inorganic acid as a precipitating agent, which also easily leads to the aggregation of noble metal nanoclusters in the

Method used

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  • Supported transition metal or transition metal alloy nanocluster catalyst and preparation method and application thereof
  • Supported transition metal or transition metal alloy nanocluster catalyst and preparation method and application thereof
  • Supported transition metal or transition metal alloy nanocluster catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: prepare the Pt / C supported metal nanocluster catalyst containing 5wt%Pt

[0031] Dissolve 1g of chloroplatinic acid hexahydrate in 50ml of ethylene glycol, add it to 50ml of sodium hydroxide in ethylene glycol (0.26mol / L) with stirring, continue stirring for 30min at room temperature, and dissolve the resulting reactant Under the protection of nitrogen, reflux at 433K for 3 hours to prepare "unprotected" platinum metal nanocluster colloids, and cool to room temperature for later use, in which the concentration of metal Pt is 3.75g / L.

[0032] Transmission electron microscopy analysis showed that the average particle size of the Pt metal nanoclusters was 2nm, and the particle size distribution was 1-3nm. Electron micrographs of Pt metal nanoclusters as figure 1 shown.

[0033] Get Ketjen EC-300J type carbon black (specific surface area, 950m 2 / g) 2.0g dispersed in 30ml ethanol, ultrasonically dispersed.

[0034] Take 28.1ml of the above-mentioned Pt me...

Embodiment 2

[0037] Embodiment 2: prepare the Pt / C supported metal nanocluster catalyst containing 50wt%Pt

[0038] Dissolve 1.3282g of chloroplatinic acid hexahydrate in 10ml of ethylene glycol, add it into 10ml of sodium hydroxide in ethylene glycol solution (1.69mol / L) with stirring, continue to stir at room temperature for 30min, and react the obtained The material was refluxed at 433K for 3 hours under the protection of nitrogen to prepare the "non-protected" platinum metal nanocluster colloid, which was cooled to room temperature for later use, and the concentration of metal Pt was 25.0 g / L.

[0039] Get Vulcan XC-72R type carbon black (specific surface area, 256m 2 / g) 0.4g was dispersed in 55ml of water and ultrasonically dispersed.

[0040] Take 16.0ml of the prepared Pt metal nanocluster colloid, add it dropwise to the above water dispersed with 0.4g of carbon carrier (Vulcan XC-72R) under rapid stirring, continue to stir for 12h, the precipitate is filtered under reduced pressu...

Embodiment 3

[0043] Embodiment 3: preparation contains the Pt / C supported metal nanocluster catalyst containing 40wt%Pt

[0044] By the same method as in Example 2, adjust the mass ratio of Pt metal nanoclusters and carbon support (Vulcan XC-72R) in the Pt metal nanocluster colloid to prepare a Pt / C supported metal nanocluster catalyst containing 40 wt% platinum.

[0045] The electron micrographs of the prepared Pt / C supported metal nanocluster catalyst are as follows: Figure 4 As shown, transmission electron microscope analysis shows that the average particle size of Pt metal nanoclusters in the prepared Pt / C supported metal nanocluster catalyst is 2.5 nm, and the particle size distribution is 1-4 nm. The above characterization results show that the metal Pt nanoclusters are well dispersed on the carbon support, and there is no obvious aggregation between the Pt nanoclusters on the support.

[0046] The catalyst exhibits excellent catalytic performance in the reaction of 2,3,5-trimethyl...

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Abstract

The invention discloses a transition metal or an alloy nanocluster catalyst and preparation method and application thereof. The invention prepares a supported transition metal or an alloy nanoclustercatalyst by a new method in which a transition metal or an alloy nanocluster which is synthesized by an alkali-polyol method and stabilized by solvent and simple ions is supported on a carbon or oxidecarrier. The content of the transition metal or alloy nanocluster in the catalyst is 0.1-50wt%, and the particle size is 0.7-5nm. The transition metal or alloy nanocluster in the catalyst is distributed on the outer surface or in mesopores and macropores of the carrier material, and the atoms on the surface of the metal or alloy nanocluster have high availability. The catalyst has good catalyticperformance on the hydrogenation of 2,3,5-trimethylquinone, and the catalytic activity of the prepared Pt/Al2O3 and Pt/C supported metal nanocluster catalyst on the hydrogenation of the 2,3,5-trimethylquinone is much higher than that of the corresponding commercially available catalysts.

Description

technical field [0001] The invention relates to a class of supported transition metal or transition metal alloy nano-cluster catalysts and a preparation method and application thereof. Background technique [0002] Transition metal or alloy nanoclusters (i.e., transition metal or alloy nanoparticles with small size and narrow particle size distribution) are a class of nanomaterials with wide application value, and are important structural units for the construction of various functional materials (Y. Wang and Y . Wei, "Metal Nanoclusters" (Chapter) in H.S. Nalwa, Ed., Encyclopedia of Nanoscience and Nanotechnology, Vol.5, 337-367, 2004, American Scientific Publishers). The applicant of the present invention once invented a class of "non-protected" transition metal or alloy nanoclusters and the "alkali-polyol method" for synthesizing such nanoclusters. This kind of metal nanoclusters only uses simple ions and organic solvent molecules as stabilizers. Not only are they small ...

Claims

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Application Information

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IPC IPC(8): B01J23/40B01J23/89B01J23/63B01J23/60B01J37/02B01J37/16C07C39/08C07C29/136
Inventor 王远刘洪全郑宁刘岩
Owner PEKING UNIV
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