Method for stabilizing palladium catalyst by montmorillonite

A palladium catalyst and montmorillonite technology, applied in the field of montmorillonite-stabilized palladium catalysts, can solve the problems of low oxygen reduction activity, poor stability and the like, and achieve the effects of high oxygen reduction activity, accelerated transfer, and excellent oxygen reduction catalytic performance.

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

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for montmorillonite-stabilized palladium catalysts for the poor stability and low oxygen reduction activity of existing palladium-based catalysts

Method used

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  • Method for stabilizing palladium catalyst by montmorillonite
  • Method for stabilizing palladium catalyst by montmorillonite
  • Method for stabilizing palladium catalyst by montmorillonite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The concrete steps of a kind of method of montmorillonite stable palladium catalyst are as follows:

[0044] (1) Organic cationic modification of montmorillonite

[0045] Take sodium montmorillonite and cetyltrimethylammonium bromide according to the mass ratio of sodium montmorillonite: hexadecyltrimethylammonium bromide is 1: 0.5; Add deionized water at 60°C, and ultrasonically stir for 30 minutes to form a sodium-montmorillonite suspension with a mass concentration of 0.05 g / ml; Add it to the above sodium-based montmorillonite suspension, stir ultrasonically at 60°C for 20 minutes, then heat and reflux at 100°C for 24 hours, cool to 60°C, and finally vacuum filter, wash with deionized water, and dry And the organic cationic modified montmorillonite is obtained after grinding.

[0046] (2) Preparation of perfluorosulfonic acid resin intercalation organic cation-modified montmorillonite suspension

[0047] Organic cationic modified montmorillonite obtained by step (...

Embodiment 2

[0057] The concrete steps of a kind of method of montmorillonite stable palladium 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] Organic cationic modified montmorillonite obtained by step (1): the mass ratio of perfluorosulfonic acid resin is 1: 0.1. Weigh organic cationic modified montmorillonite and perfluorosulfonic acid resin, wherein perfluorosulfonic acid resin The mass concentration of the solution is 5%; then the organic cation-modified montmorillonite is added to ethanol, ultrasonically oscillated for 40 minutes, and stirred at 60°C for 3 hours to disperse evenly to form an organic cation-modified montmorillonite with a mass concentration of 0.03g / ml Montmorillonite suspension; then add perfluorosulfonic acid resin solution to the above suspension, stir at 60°C for 12 hours, and cool to room temperature t...

Embodiment 3

[0070] The concrete steps of a kind of method of montmorillonite stable palladium catalyst are as follows:

[0071] Step (1) is the same as step (1) in Example 1.

[0072] (2) Preparation of perfluorosulfonic acid resin intercalation organic cation-modified montmorillonite suspension

[0073]Organic cationic modified montmorillonite obtained by step (1): the mass ratio of perfluorosulfonic acid resin is 1: 0.3. Weigh organic cationic modified montmorillonite and perfluorosulfonic acid resin, wherein perfluorosulfonic acid resin The mass concentration of the solution is 5%; then the organic cation-modified montmorillonite is added to isoprene glycol, ultrasonically oscillated for 40 minutes, and stirred at 70°C for 1 hour to disperse evenly to form an organic compound with a mass concentration of 0.05g / ml. Cationic modified montmorillonite suspension; then add perfluorosulfonic acid resin solution to the above suspension, stir at 70°C for 5 hours, and cool to room temperature ...

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Abstract

The invention provides a method for stabilizing a palladium catalyst by montmorillonite and belongs to the technical field of fuel cells. The method comprises the following steps of: exchanging palladium cations into a montmorillonite layer intercalated with perfluorinated sulfonic acid resin through ion exchange; performing in-situ reduction on the palladium cations into nano palladium inside the montmorillonite layer by using a chemical method; and finally, forming the catalyst with an excellent three-phase interface of a fuel cell catalyst by introducing carbon powder. The prepared catalyst has the advantages of high catalytic stability and high oxygen reduction activity, can be widely used as a catalyst of a proton exchange membrane fuel cell taking hydrogen and methanol as fuel, has better oxygen reduction catalytic performance than a Pd / C catalyst using carbon as a carrier, is equivalent to a commercial Pd / C catalyst in British Jonhson-Matthey Company, has obviously higher stability than that the Pd / C catalyst using carbon as the carrier, and can replace the Pd / C catalyst to become a main fuel cell catalyst.

Description

1. Technical field [0001] The invention belongs to the technical field of fuel cells, in particular to a method for stabilizing a palladium catalyst with montmorillonite. 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. In the process of fuel cell industrialization, its cost and life problems have always been the core issues that plague its development. Currently, the main reason for the high cost of fuel cells is the extensive use of the precious metal Pt. Due to the high price of Pt and the scarcity of resources, the development of non-Pt catalysts and the improvement of catalyst activity have become the focus of research on fuel cell catalysts. Metal Pd has the advantages of abundant reserves, low price and excellent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/92B01J31/22
CPCY02E60/50
Inventor 魏子栋丁炜陈四国张骞赵巧玲李云霞刘灿
Owner CHONGQING UNIV
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