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Preparation method of high-performance palladium/graphene methanoic acid oxidation catalyst

A formic acid oxidation and graphene technology, which is applied in the field of formic acid oxidation catalyst preparation, can solve the problems of unsatisfactory catalytic performance of formic acid, large palladium metal crystal particle size, and small specific surface of carbon carrier, and achieve excellent long-term stability, high ratio Surface area, the effect of simple preparation method

Inactive Publication Date: 2014-07-02
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Commercial palladium / carbon catalysts have unsatisfactory performance and low stability in catalyzing formic acid due to their large palladium metal crystal particle size and small carbon support surface area.

Method used

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  • Preparation method of high-performance palladium/graphene methanoic acid oxidation catalyst
  • Preparation method of high-performance palladium/graphene methanoic acid oxidation catalyst
  • Preparation method of high-performance palladium/graphene methanoic acid oxidation catalyst

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Embodiment 1

[0028] The preparation method of the palladium / graphene high-performance formic acid oxidation catalyst of the present embodiment may further comprise the steps:

[0029] 1) Dissolve 10.5mg of graphene, 50mg of polyvinylpyrrolidone and 12mg of ammonium chloropalladate in 2ml of water to prepare a mixed solution;

[0030] 2) After ultrasonically dispersing the mixed solution prepared in step 1) for 30 minutes, add 3ml of formic acid, and continue to ultrasonically mix for 5 minutes;

[0031] 3) Put the solution homogeneously mixed in step 2) in a reaction kettle for hydrothermal reaction at 120°C for 12 hours;

[0032] 4) Wash the product of the hydrothermal reaction in step 3) and dry it at 60°C for 6 hours to obtain a palladium / graphene high-performance formic acid oxidation catalyst.

[0033] figure 1 The transmission electron microscope figure of the palladium / graphene catalyst prepared for embodiment 1; can clearly find out from the figure that ultra-small palladium meta...

Embodiment 2

[0038] The preparation method of the palladium / graphene high-performance formic acid oxidation catalyst of the present embodiment may further comprise the steps:

[0039] 1) Dissolve 18mg of graphene, 70mg of polyvinylpyrrolidone and 12mg of ammonium chloropalladate in 3ml of water to prepare a mixed solution;

[0040] 2) After ultrasonically dispersing the mixed solution prepared in step 1) for 40 minutes, add 4ml of formic acid, and continue to ultrasonically mix for 10 minutes;

[0041] 3) Put the solution homogeneously mixed in step 2) in a reaction kettle for hydrothermal reaction at 140°C for 8 hours;

[0042] 4) Wash the product of the hydrothermal reaction in step 3) and dry it at 80°C for 6 hours, which is a palladium / graphene high-performance formic acid oxidation catalyst.

[0043] Figure 4 For the transmission electron microscope figure of the palladium / graphene catalyst prepared in embodiment 2; from the figure, it can be clearly seen that ultra-small palladium...

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Abstract

The invention discloses a preparation method of a high-performance palladium / graphene methanoic acid oxidation catalyst. The preparation method comprises the following steps: (1) dissolving graphene, polyvinylpyrrolidone and ammonium tetrachloropalladate into water, so as to prepare a mixed solution; (2) after carrying out uniform ultrasonic dispersion on the mixed solution prepared in the step (1), adding methanoic acid, and continuously carrying out the uniform ultrasonic dispersion; (3) carrying out hydrothermal reaction on the solution uniformly and ultrasonically dispersed in the step (2); and (4) cleaning and drying a product of the hydrothermal reaction in the step (3), so as to obtain the high-performance palladium / graphene methanoic acid oxidation catalyst. Compared with a commercial palladium / carbon catalyst, the palladium / graphene catalyst prepared by utilizing the preparation method has excellent methanoic acid oxidation catalytic performance and long term stability and a high practical value and can be used for replacing commercial palladium / carbon catalyst to be directly applied to methanoic acid fuel cells and other energy conversation fields; furthermore, the catalyst is wide in raw material source and simple in preparation method and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a preparation method of a formic acid oxidation catalyst, in particular to a preparation method of a palladium / graphene high-performance formic acid oxidation catalyst. Background technique [0002] Fuel cells are high-efficiency and clean power generation devices that directly convert chemical energy into electrical energy. It is of great significance to solve the two major problems of "energy shortage" and "environmental pollution" facing the world today. It is considered to be the most important energy source in the 21st century. one. Direct formic acid fuel cells have attracted much attention due to their high electrochemical catalytic activity, low permeability, non-toxic, non-combustible, convenient storage and transportation, and safety, and have become a hot topic in current research. [0003] Formic acid oxidation is one of the most important electrocatalytic reactions in fields such as direct formic acid fuel cells....

Claims

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Application Information

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IPC IPC(8): B01J23/44H01M4/92
CPCY02E60/50
Inventor 李长明张连营赵志亮
Owner SOUTHWEST UNIVERSITY
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