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Catalyst for catalyzing methyl alcohol, preparation method and chemically modified electrode of catalyst

A catalyst, methanol technology, applied in the field of polymers, can solve the problems of direct interaction obstruction, low methanol oxidation reaction kinetics, difficult to achieve mass transfer and electron transfer, etc.

Inactive Publication Date: 2013-07-24
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to steric hindrance and the randomness of the reaction, the direct interaction between CO and oxygen-containing groups is hindered, making it difficult to achieve faster mass transfer and electron transfer, so the methanol oxidation reaction kinetics is still at a low level.

Method used

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  • Catalyst for catalyzing methyl alcohol, preparation method and chemically modified electrode of catalyst
  • Catalyst for catalyzing methyl alcohol, preparation method and chemically modified electrode of catalyst
  • Catalyst for catalyzing methyl alcohol, preparation method and chemically modified electrode of catalyst

Examples

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preparation example Construction

[0043] The invention provides a preparation method of a catalyst for methanol catalysis, comprising the following steps:

[0044] Provide a dispersion of graphene oxide;

[0045] The polyacrylic acid and ferrocene are mixed, and the polyacrylic acid-ferrocene compound is obtained after the reaction;

[0046] Mixing the graphene oxide dispersion with the polyacrylic acid-ferrocene composite and the metal nanoparticle precursor to obtain a mixed solution;

[0047] The mixed solution is mixed with a reducing agent, and a catalyst for methanol catalysis is obtained after a reduction reaction is performed.

[0048] The present invention provides a dispersion liquid of graphene oxide. The present invention has no special limitation on the source of the graphene oxide, and the graphene oxide well known to those skilled in the art can be used. In the present invention, the preparation method of the graphene oxide is the same as the preparation method of the graphene oxide described...

Embodiment 1

[0087] In a 500mL beaker, add 2.5g expanded graphite and 5g sodium nitrate, then add 120mL concentrated sulfuric acid with a mass concentration of 98%, and stir the obtained mixture under ice bath conditions for 120min;

[0088] Then, under the condition of strong stirring, slowly add 15g potassium permanganate to the obtained mixture to carry out the reaction, and the temperature of the reaction is controlled below 20°C;

[0089] After the addition of potassium permanganate was completed, the ice bath was removed, and the resulting reaction product was stirred at room temperature overnight. As the reaction progressed, the inventors observed that the mixture in the beaker gradually turned into a paste, and the color changed to bright brown;

[0090] Finally, 150 mL of secondary water was added dropwise to the beaker under vigorous stirring, the reaction temperature rose rapidly to 98°C, foam was observed, and the color of the reaction product in the beaker turned yellow;

[0...

Embodiment 2

[0094] The graphene oxide obtained in 30 mg of Example 1 was dissolved in 45 mL of methanol aqueous solution, and the volume ratio of methanol to water in the methanol aqueous solution was 1: 1, and graphene oxide (GO) dispersion was obtained after ultrasonication for 30 min;

[0095] 2mL of polyacrylic acid-ferrocene solution was added to the above GO dispersion, wherein the molar concentration of polyacrylic acid was 1.2 mol / L, and the molar concentration of ferrocene was 0.1 mol / L. After ultrasonication for 60 min, under stirring Add 1 mL of H with a molar concentration of 0.038 mol / L to it. 2 PtCl 6 Aqueous solution, then, add dropwise a NaOH solution with a molar concentration of 0.5 mol / L to it, and adjust the pH value of the mixed solution to 11;

[0096] Then, 200 mg of NaBH was slowly added to the mixed solution with a pH value of 11 under stirring conditions. 4 Powder, continue stirring at room temperature for 24h. Finally, the obtained reaction product was subjec...

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Abstract

The invention discloses a catalyst for catalyzing methyl alcohol. The catalyst disclosed by the invention comprises graphene, a polyacrylic acid-ferrocene compound and metal nanoparticles, wherein the mass ratio of the grapheme to the polyacrylic acid-ferrocene compound and the metal nanoparticles is (20-50):(150-250):(1-15). The graphene is taken as a substrate material of the catalyst for catalyzing methyl alcohol disclosed by the invention; the polyacrylic acid-ferrocene compound can enter a layer structure of the graphene to inhibit the aggregation of the graphene; homogeneous nucleation of the metal nanoparticles is promoted by the polyacrylic acid, so that the loaded metal nanoparticles has a higher catalytic activity; due to a net structure of the polyacrylic acid, the graphene-polyacrylic acid-ferrocene has a multi-channel stereoscopic structure, the movement of the particles is buffered and the homogeneous growth of the metal nanoparticles is further promoted. Therefore, the catalyst for catalyzing methyl alcohol disclosed by the invention has the advantages of higher catalytic activity for methanol and higher capability of resisting the poisoning of an intermediate.

Description

technical field [0001] The invention relates to the technical field of polymers, in particular to a catalyst for methanol catalysis, a preparation method thereof and a chemically modified electrode. Background technique [0002] Direct methanol fuel cells have been extensively studied due to their high energy density, easy operation, and environmental friendliness. However, due to the high catalyst cost and serious catalyst poisoning effect, direct methanol fuel cells have not yet achieved large-scale commercialization. [0003] In order to improve the utilization rate of catalyst Pt and enhance its anti-poisoning ability, the main way in the prior art is to prepare Pt-based alloy catalysts. The mechanism on which this method is based includes two, namely the bifunctional mechanism and the electronic effect. According to the dual-functional mechanism, the second metal can promote the dissociation of active water at a lower potential, thereby providing a large number of oxy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22H01M4/92
CPCY02E60/50
Inventor 王宗花史国玉夏建飞张菲菲李延辉夏延致
Owner QINGDAO UNIV
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