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Preparation method of modified palladium metal catalyst, prepared catalyst and application thereof

A metal catalyst and modification technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, chemical instrument and method, physical/chemical process catalyst, etc., can solve the problem of low catalytic activity, small catalytic active area, palladium metal Particle distribution and other issues, to achieve strong catalytic activity, increase catalytic active area, and strong anti-carbon monoxide poisoning ability

Inactive Publication Date: 2014-10-29
南京市生态环境保护科学研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with platinum metal catalysts, the existing palladium metal catalysts have a larger radius, which results in fewer catalytic sites per unit surface area and a smaller catalytic active area, resulting in lower catalytic activity.
In addition, it can be seen from the prior art that the more even the palladium metal particles are distributed on the carrier, the higher the catalytic activity of the catalyst is. However, it is difficult to make the palladium metal particles evenly distributed on the carrier in the prior art. Another reason for lower activity

Method used

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  • Preparation method of modified palladium metal catalyst, prepared catalyst and application thereof
  • Preparation method of modified palladium metal catalyst, prepared catalyst and application thereof
  • Preparation method of modified palladium metal catalyst, prepared catalyst and application thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 prepares modified palladium metal catalyst

[0025] The preparation method of the present embodiment modified palladium metal catalyst comprises the following steps:

[0026] The first step is to prepare the titanium dioxide dispersion: firstly grind the titanium dioxide powder evenly and then calcinate it for the first time, then add nitric acid solution to the powder calcined for the first time until the powder is wet, and then calcinate it for the second time after drying; then, the second time The secondary calcined powder is ground evenly and added with hydrofluoric acid solution, stirred and filtered to obtain a solid, and the solid is washed with water until the washing liquid is neutral and dried to obtain a powder; then, deionized water is added to the dried powder to obtain a solid-liquid ratio It is 5-10 g / L titanium dioxide dispersion.

[0027] Wherein, the titanium dioxide powder with a particle size of 20-80 nanometers, the nitric acid soluti...

Embodiment 2

[0043] Transmission electron microscope test and X-ray diffraction test of embodiment 2 modified palladium metal catalysts

[0044] The modified palladium metal catalysts prepared in each case of Example 1 were tested by transmission electron microscopy and X-ray diffraction using existing conventional methods.

[0045] The results show that the test results of each case are basically the same. Among them, the transmission electron microscope picture and its particle size distribution picture are as follows figure 1 As shown, the data shows that in the catalyst prepared in Example 1, the particle diameter of the palladium metal particles is mainly 3.5-5.0 nanometers, and the average particle diameter is 4.5 nanometers; this result shows that the palladium metal particles distributed on the surface of the carrier are evenly distributed. X-ray diffraction pattern as figure 2 As shown, it shows that the precursor-supported palladium metal catalyst was successfully prepared on ...

Embodiment 3

[0046] Embodiment 3 Modified palladium metal catalyst to the oxidation electrocatalytic performance detection of alkaline system ethanol

[0047] The detection experiment adopts a three-electrode system, wherein, the catalyst prepared in Example 1 is used as the working electrode, the platinum plate electrode is used as the counter electrode, and the saturated calomel electrode is used as the reference electrode, and Chenhua CHI660D electrochemical workstation is used as the detection experimental workstation. The volume of alkaline ethanol electrolyte (0.25mol / L ethanol + 0.25mol / L potassium hydroxide solution) is 10 ml, and the catalytic activity of the catalyst is investigated by cyclic voltammetry (the scan rate is 50 mV / s, and the scan potential range -0.8~0.6 volts).

[0048] The result is as image 3 As shown, wherein, the positive sweep peak current value is 19.6 mA / cm2, and the reverse sweep peak current value is 8.1 mA / cm2. Show that the catalyst prepared in Exampl...

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Abstract

The invention relates to a preparation method of a modified palladium metal catalyst, a prepared catalyst and applications thereof. The method comprises the following steps: preparing a titanium dioxide dispersion liquid; preparing titanium dioxide and tin oxide substrate; preparing a catalyst precursor; and preparing a modified palladium metal catalyst. A catalyst prepared by using the method disclosed by the invention is extremely strong in catalytic activity and carbon monoxide poisoning resistance, and applicable to alcohols fuel cells under alkaline conditions.

Description

technical field [0001] The invention relates to a preparation method of a modified palladium metal catalyst, the obtained catalyst and its application, and belongs to the technical fields of nanomaterials and fuel cell catalysts. Background technique [0002] As far as the applicant knows, direct alkaline fuel cells (such as direct methanol fuel cells, direct ethanol fuel cells, and direct ethylene glycol fuel cells) have received extensive theoretical research and experimental applications worldwide, and direct methanol fuel cells have been Conducted preliminary market application research. Direct methanol fuel cells use alkaline methanol system. Alkaline conditions can significantly improve the kinetics of methanol oxidation, but this system will generate more carbon monoxide, which will easily lead to catalyst poisoning and deactivation, and the entire fuel cell will be scrapped; direct ethanol or Ethylene glycol fuel cells use alkaline ethanol or ethylene glycol system....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/62H01M4/92
CPCY02E60/50
Inventor 路云霞刘海滨于忠华卢宁川李文青
Owner 南京市生态环境保护科学研究院
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