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Method for preparing montmorillonite-loaded platinum catalyst

A platinum catalyst, montmorillonite technology, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as poor stability, achieve good stability, high oxygen reduction activity, and improve catalytic activity.

Inactive Publication Date: 2010-12-15
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of montmorillonite-supported platinum catalyst for the poor stability of the existing fuel cell catalysts

Method used

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  • Method for preparing montmorillonite-loaded platinum catalyst
  • Method for preparing montmorillonite-loaded platinum catalyst
  • Method for preparing montmorillonite-loaded platinum catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The concrete steps of a kind of preparation method of montmorillonite supported platinum catalyst are as follows:

[0035] (1) Preparation of Organic Cationic Modified Montmorillonite

[0036] Weigh sodium montmorillonite and cetyltrimethylammonium bromide according to the mass ratio of sodium montmorillonite: hexadecyltrimethylammonium bromide is 1:0.5; first add sodium montmorillonite In deionized water at 60°C, ultrasonically stir for 30 minutes to form a sodium montmorillonite suspension with a mass concentration of 0.05g / ml; then slowly add cetyltrimethylammonium bromide under ultrasonic stirring at 60°C into the above sodium-based montmorillonite suspension, ultrasonically stirred at 60°C for 20 minutes, then heated to reflux at 100°C for 24 hours, cooled to 60°C, and finally vacuum filtered, deionized water washed, dried and The organic cation modified montmorillonite is obtained after grinding.

[0037] (2) Preparation of perfluorosulfonic acid resin intercala...

Embodiment 2

[0046] The concrete steps of a kind of preparation method of montmorillonite supported platinum catalyst are as follows:

[0047] Step (1) is the same as step (1) in Example 1.

[0048] (2) Preparation of perfluorosulfonic acid resin intercalation organic cation-modified montmorillonite suspension

[0049] The mass ratio of organic cationic modified montmorillonite: perfluorosulfonic acid resin is 1: 0.2 to take by weighing the organic cationic modified montmorillonite and perfluorosulfonic acid resin of step (1), wherein the perfluorosulfonic acid resin solution The mass concentration is 5%; then the organic cation-modified montmorillonite is added into deionized water, and ultrasonically stirred to form an organic cation-modified montmorillonite suspension with a mass concentration of 0.01g / ml; The fluorosulfonic acid resin solution was ultrasonically stirred at 50° C. for 16 hours, and cooled to room temperature to obtain a perfluorosulfonic acid resin intercalated organic...

Embodiment 3

[0057] The concrete steps of a kind of preparation method of montmorillonite supported platinum catalyst are as follows:

[0058] Step (1) is the same as step (1) in Example 1.

[0059] (2) Preparation of perfluorosulfonic acid resin intercalation organic cation-modified montmorillonite suspension

[0060] According to organic cationic modified montmorillonite: the mass ratio of perfluorosulfonic acid resin is 1: 0.3 to take by weighing the organic cationic modified montmorillonite and perfluorosulfonic acid resin of step (1), wherein the perfluorosulfonic acid resin solution The mass concentration is 5%; then the organic cation-modified montmorillonite is added into deionized water, and the organic cation-modified montmorillonite suspension with a mass concentration of 0.1 g / ml is formed through ultrasonic stirring; The fluorosulfonic acid resin solution was ultrasonically stirred at 80° C. for 5 hours, and cooled to room temperature to obtain a perfluorosulfonic acid resin ...

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Abstract

The invention provides a method for preparing a montmorillonite-loaded platinum catalyst and belongs to the technical field of fuel batteries. The method comprises the following steps of: exchanging Pt positive ions into a montmorillonite layer of perfluorinated sulfonic acid resin intercalation by an ion exchange method; reducing the Pt positive ions to Pt nano particles by a chemical method; etching montmorillonite into a porous layered structure by using hydrofluoric acid; and introducing carbon powder serving as a conductive agent to form the catalyst with an excellent three-phase interface for catalytic reaction of the fuel batteries. The catalyst prepared by the method has the advantages of high stability and high oxygen reduction activity, can be widely used as the catalyst of proton exchange membrane fuel batteries taking hydrogen and methanol as fuel, has the catalytic activity and the stability which are higher than those of a commercial Pt / C catalyst of Jonhson-Matthey company in Britain, and can replace the same kind of commercial catalyst products.

Description

1. Technical field [0001] The invention belongs to the technical field of fuel cells, in particular to a preparation method of a montmorillonite supported platinum catalyst. 2. Background technology [0002] Fuel cells have the advantages of high energy conversion efficiency, environmental friendliness, and rapid start-up at room temperature, and are considered to be the most promising chemical power sources for electric vehicles and other civilian applications in the future. However, the high cost and service life of fuel cells have always been the core issues that plague their development. The extensive use of noble metal Pt is the main reason for the high cost of fuel cells. In order to reduce the cost, Pt is highly dispersed on the carbon support in the form of nano-sized particles to improve the utilization rate of Pt and reduce the usage of Pt. However, due to the large difference in electronic structure between Pt and the carbon support, Pt nanoparticles are easy to ...

Claims

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Application Information

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IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 魏子栋丁炜陈四国李莉蔡洪英李庆武杨林江
Owner CHONGQING UNIV
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