Method for preparing high-activity Pd nano particle-supported carbon catalyst by diglycol reduction process

A nano-catalyst, diethylene glycol technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the reduction of catalyst dispersion, catalytic activity and stability. , reduce the catalytic efficiency and surface activity of the catalyst, the uneven distribution of Pd nanoparticles, and achieve the effect of inhibiting mutual aggregation, small particle size, and mild reaction conditions

Inactive Publication Date: 2015-08-05
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the atomic distribution of the prepared Pd nanoparticles is extremely inhomogeneous, in order to control the size and degree of dispersion of the particles, it is necessary to add a protective agent or a stabilizer
However, the added stabilizer is strongly adsorbed on the surface of Pd nanoparticles, which greatly reduces the catalytic efficiency and surface activity of the catalyst.
In addition, the commonly used precursor is chloropalladium acid or palladium chloride, which will generate chloride ions during reduction, which can cause chloride ion poisoning, resulting in reduced catalyst dispersion, catalytic activity and stability.

Method used

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  • Method for preparing high-activity Pd nano particle-supported carbon catalyst by diglycol reduction process
  • Method for preparing high-activity Pd nano particle-supported carbon catalyst by diglycol reduction process
  • Method for preparing high-activity Pd nano particle-supported carbon catalyst by diglycol reduction process

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Embodiment 1

[0020] Weigh 10 mg of Vulan XC-72R activated carbon from Cabot Company, add it to 9 mL of diethylene glycol, oscillate ultrasonically for 3 to 5 minutes, then add 1.2 mg of palladium acetate, after ultrasonic dissolution, stir mechanically at 80 °C for 3 hours, and centrifuge, The obtained precipitate was dried in a vacuum drying oven at 60° C. to obtain a Pd / C catalyst, and the loading amount of metal Pd in ​​the catalyst was 10 wt.%.

Embodiment 2

[0025] Weigh 10 mg of Vulan XC-72R activated carbon from Cabot Company, add it to 9 mL of diethylene glycol, oscillate ultrasonically for 3 to 5 minutes, then add 1.2 mg of palladium acetate, after ultrasonic dissolution, mechanically stir at 70 ° C for 4 hours, centrifuge, The obtained precipitate was dried in a vacuum drying oven at 60° C. to obtain a Pd / C catalyst. The loading amount of metal Pd in ​​the catalyst was 10 wt.%, and the metal Pd particles were evenly dispersed, with an average particle diameter of 3-5 nm.

Embodiment 3

[0027] Weigh 10 mg of Vulan XC-72R activated carbon from Cabot Company, add it to 9 mL of diethylene glycol, oscillate ultrasonically for 3 to 5 minutes, then add 1.2 mg of palladium acetate, after ultrasonic dissolution, mechanically stir at 90°C for 2 hours, and centrifuge, The obtained precipitate was dried in a vacuum drying oven at 60° C. to obtain a Pd / C catalyst. The loading amount of metal Pd in ​​the catalyst was 10 wt.%, and the metal Pd particles were evenly dispersed, with an average particle diameter of 3-5 nm.

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Abstract

The invention discloses a method for preparing high-activity Pd nano particle-supported carbon nano catalyst by diglycol reduction process. In the method, diglycol is used as a solvent and a reducing agent, and Pd nano particle-supported carbon catalyst is obtained. Pd nano particles in the prepared catalyst are uniformly dispersed and average particle size is 2-5 nm; moreover, electro-catalytic property of the catalyst to methyl alcohol is obviously improved, and the catalyst has excellent electro-catalytic property and stability. The preparation method is simple and easy in operation, is energy-saved and environmental-friendly, has no pollution, high economic benefit and is very applicable to industrial large-scale production.

Description

technical field [0001] The invention relates to a method for preparing a direct methanol fuel cell catalyst, in particular to a method for preparing highly active carbon-supported Pd nanoparticles with diethylene glycol as a solvent and reducing agent. Background technique [0002] With the rapid development of my country's economy, the development and use of energy has become one of the focuses of people's attention. Traditional energy such as coal, oil, natural gas and other energy sources cause serious pollution, so the development and utilization of green energy is an inevitable choice to achieve sustainable energy development. Fuel cell is a new type of high-efficiency and green power generation device. It can directly convert chemical energy into electrical energy isothermally and electrochemically, and has become the most promising new energy source. [0003] The direct methanol fuel cell (DMFC) with methanol as fuel has the characteristics of high energy density, si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44H01M4/92
CPCY02E60/50
Inventor 陈煜何珊李淑妮
Owner SHAANXI NORMAL UNIV
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