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Preparation method for metal-organic-framework-loaded platinum-based catalyst

A metal-organic framework and catalyst technology, which is applied in the field of preparation of metal-organic framework-supported platinum catalysts, can solve the problems of large average particle size and poor catalyst dispersion, and achieve the effects of uniform distribution, difficulty in agglomeration, and high electrochemical catalytic activity

Inactive Publication Date: 2016-09-21
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that the method is simple, and the disadvantage is that the prepared catalyst has poor dispersion and large average particle size.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 1g metal organic framework (center ion is Co, specific surface area is 534.3m 2 / g) into 20mL of ethylene glycol, vibrate with ultrasonic until a uniform dispersion is formed, then dropwise add 2mL of a mixed solution containing 0.01M chloroplatinic acid and 0.01M cobalt chloride, then add formic acid and stir at 25°C for 30 Minutes, then placed in a microwave oven at 1000W power for 10s and intermittently for 50s, heated for 10min, cooled and filtered, and vacuum dried for 10 hours to obtain a metal-organic framework-loaded Pt-based nanocatalyst. The charge-discharge efficiency for lithium-air batteries is 89.7%.

Embodiment 2

[0014] 0.5g metal organic framework (center ion is Mn, specific surface area is 3981.2m 2 / g) was added to 20mL of ethylene glycol, and ultrasonically oscillated until a uniform dispersion was formed, then 5mL of a mixed solution containing 0.2M chloroplatinic acid and 0.2M cobalt chloride was added dropwise, then formic acid was added and stirred at 25°C for 30 minutes, then placed in a microwave oven at 700W for 10s and intermittently for 50s, heated for 10min, cooled and filtered, and vacuum dried for 10 hours to prepare a Pt-based nanocatalyst supported by a metal-organic framework, which is used for the charge-discharge efficiency of lithium-air batteries was 83.6%.

Embodiment 3

[0016] 0.7g metal organic framework (center ion is Fe, specific surface area is 2353.8m 2 / g) was added to 20mL of ethylene glycol, and ultrasonically oscillated until a uniform dispersion was formed, then 4mL of a mixed solution containing 0.2M chloroplatinic acid and 0.2M cobalt chloride was added dropwise, then formic acid was added and stirred at 25°C for 30 Minutes, then placed in a microwave oven at 1500W power for 10s and intermittently for 50s, heated for 10min, cooled and filtered, and vacuum dried for 10 hours to prepare a metal-organic framework-loaded Pt-based nanocatalyst for the charge and discharge efficiency of lithium-air batteries was 84.1%.

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Abstract

The invention discloses a preparation method for a metal-organic-framework-loaded platinum-based catalyst. The metal organic framework is added to an alcoholic solution and the mixture is subjected to ultrasonic oscillation; then a mixed solution of chloroplatinic acid and cobalt oxide is added in a dropwise manner; next, NaOH is added and stirred, and the mixture is placed in a microwave oven to be heated intermittently; and next, the mixture is subjected to cooling, suction filtration and vacuum drying to obtain the metal-organic-framework-loaded platinum-based catalyst. The catalyst prepared by the invention is small in granules, hard to agglomerate, high in dispersibility and high in electrochemical catalytic activity.

Description

technical field [0001] The invention relates to a preparation method of a platinum catalyst supported by a metal organic framework. Background technique [0002] At present, the commonly used oxygen reduction catalysts in fuel cells and lithium-air batteries are carbon-supported platinum-based catalysts. However, due to the shortage of Pt resources and high prices, appropriate preparation methods and process conditions must be adopted to improve the dispersion of Pt and reduce the particle size of Pt. , reduce the load of Pt in the catalyst, and reduce the cost of the catalyst. At present, there are many methods for preparing unit and multi-component catalysts, such as impregnation-liquid phase reduction method: after dissolving the precursor of Pt, mixing with activated carbon carrier, and then adding a reducing agent, such as NaBH 4 , formaldehyde solution, sodium citrate, sodium formate, hydrazine, etc., to reduce Pt, deposit it on activated carbon, and obtain a Pt / C cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/92B82Y30/00
CPCB82Y30/00H01M4/8825H01M4/925Y02E60/50
Inventor 何小波银凤翔李国儒
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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