Dendritic platinum-palladium alloy nanometer catalyst as well as preparation method and application thereof

A nano-catalyst, platinum-palladium alloy technology, applied in the direction of preparation of amino compounds, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the requirements of production equipment and process control The difficulty of hydrogenation and reduction of base compounds and the poor stability of battery packs have achieved high electrocatalytic stability, reduced energy consumption, and easy control

Inactive Publication Date: 2015-05-20
俞杏英
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main problem of DMFC is that the single platinum used in the industry as a catalyst has low electrocatalytic activity for methanol oxidation, and is easily poisoned by intermediate products of methanol oxidation. At the same time, the amount of catalyst is too high, and the stability of the battery pack is poor.
A large amount of three wastes (waste slag, waste liquid, waste gas) will be produced in the reduction process of iron powder or alkali sulfide, which will cause serious environmental pollution and serious corrosion to equipment. At the same time, the catalyst remaining in the product will seriously reduce the quality of the product; catalytic hydrogenation Reduction method, complete reaction, less by-products, less environmental pollution, but often requires high temperature and high pressure, high requirements for production equipment and process control, and at the same time, it is very difficult to hydrogenate and reduce polynitro compounds

Method used

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  • Dendritic platinum-palladium alloy nanometer catalyst as well as preparation method and application thereof
  • Dendritic platinum-palladium alloy nanometer catalyst as well as preparation method and application thereof
  • Dendritic platinum-palladium alloy nanometer catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Dendritic Pt 15 Pd 85 (n(Pt(acac) 2 ) / n(Pd(acac) 2 )=1:1) Preparation of catalyst:

[0034] Mix 100 mg of platinum acetylacetonate, 77.45 mg of palladium acetylacetonate and 20 mL of oleylamine into a three-necked flask. Then put this mixed solution in a standard atmospheric pressure H 2 Slowly heat to 85°C in the atmosphere, the solution turns black, keep the temperature for 2 hours and then cool to room temperature, wash 2-3 times with absolute ethanol, and finally disperse the obtained solid in absolute ethanol for later use. See the TEM image figure 1 D in the XRD diagram, see figure 2 .

[0035] Figure 5 A, B are the cyclic voltammograms of Pt / Pd nanocatalysts and comparative platinum nanoparticles in a 0.5M sulfuric acid solution saturated with nitrogen; Figure 5 C and D are the current-voltage and current-time curves of methanol oxidation of Pt / Pd nanocatalysts and comparative platinum nanoparticles in a nitrogen-saturated 0.5M sulfuric acid and 0.5M methanol mi...

Embodiment 2

[0041] Dendritic Pt 20 Pd 80 (n(Pt(acac) 2 ) / n(Pd(acac) 2 )=1.5:1) Preparation of catalyst:

[0042] 100 mg of platinum acetylacetonate, 51.64 mg of palladium acetylacetonate, and 20 mL of oleylamine were mixed and uniformly added into the three-necked flask. Then put this mixed solution in a standard atmospheric pressure H 2 Slowly heat to 85°C in the atmosphere, the solution turns black, keep the temperature for 2 hours and then cool to room temperature, wash 2-3 times with absolute ethanol, and finally disperse the obtained solid in absolute ethanol for later use. See the TEM image figure 1 C, XRD diagram in figure 2 .

[0043] Figure 5 A, B are the cyclic voltammograms of Pt / Pd nanocatalysts and comparative platinum nanoparticles in a 0.5M sulfuric acid solution saturated with nitrogen; Figure 5 C and D are the current-voltage and current-time curves of methanol oxidation of Pt / Pd nanocatalysts and comparative platinum nanoparticles in a nitrogen-saturated 0.5M sulfuric a...

Embodiment 3

[0049] Dendritic Pt 25 Pd 75 (n(Pt(acac) 2 ) / n(Pd(acac) 2 )=2:1) ​​Preparation of catalyst:

[0050] Mix 100 mg of platinum acetylacetonate, 38.73 mg of palladium acetylacetonate and 20 mL of oleylamine into a three-necked flask. Then put this mixed solution in a standard atmospheric pressure H 2 Slowly heat to 85°C in the atmosphere, the solution turns black, keep the temperature for 2 hours and then cool to room temperature, wash 2-3 times with absolute ethanol, and finally disperse the obtained solid in absolute ethanol for later use. See the TEM image figure 1 See B in XRD diagram figure 2 .

[0051] Figure 5 A, B are the cyclic voltammograms of Pt / Pd nanocatalysts and comparative platinum nanoparticles in a 0.5M sulfuric acid solution saturated with nitrogen; Figure 5 C and D are the current-voltage and current-time curves of methanol oxidation of Pt / Pd nanocatalysts and comparative platinum nanoparticles in a nitrogen-saturated 0.5M sulfuric acid and 0.5M methanol mixed...

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Abstract

The invention relates to a dendritic platinum-palladium alloy nanometer catalyst as well as a preparation method and application thereof. A structural formula of the dendritic platinum-palladium alloy nanometer catalyst is PtxPd100-x, and x is not less than 0 and not more than 100; the dendritic platinum-palladium alloy nanometer catalyst is prepared from platinum pentanedionate and palladium pentanedionate in an oleylamine solution under conditions of a temperature of 50-90 DEG C and the presence of H2. The dendritic platinum-palladium alloy nanometer catalyst is used for hydrogenation reduction of a methanol fuel cell anode catalyst and a nitrocompound. The dendritic platinum-palladium alloy nanometer catalyst shows a relatively strong poisoning resistance and relatively high electric catalysis stability in a process of an electric catalytic oxidation of a methane solution with a certain concentration, can realize the hydrogenation reduction of the nitrocompound at a low temperature and a normal pressure, has a dormant advantage especially for the hydrogenation reduction of polynitro compounds, and can be used for effectively reducing the energy consumption.

Description

Technical field [0001] The invention belongs to the field of nano metal catalysts, and particularly relates to a dendritic platinum-palladium alloy nano catalyst, and a preparation method and application thereof. Background technique [0002] Nanomaterials containing Pt and Pd can effectively catalyze the oxidation of hydrogen and the reduction of oxygen, so they have been widely studied. The most important research hotspot is to obtain the desired material composition, size and shape through effective control from theory to process, thereby improving the activity of the nanocatalyst. Yan et al. successfully developed Pt / Cu and Pd / Cu concave nanocubes, which showed good catalytic activity. Sun reported an ultrafine FePtPd nanowire with excellent catalytic properties. The Xia R&D team uses the method of seed growth, using Pt as the seed, and then modifying Pd on the Pt to form a Pt / Pd nanomaterial. Recently, Lacroix has been operating at 3 standard atmospheres of H 2 Dendritic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J23/42C07C211/46C07C211/47C07C211/52C07C211/51C07C209/36C07C217/84C07C213/02C07C225/34C07C221/00H01M4/92
CPCY02E60/50
Inventor 俞杏英顾宏伟
Owner 俞杏英
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