Device and method for preparing carbon-supported platinum nanometer catalyst slurry

A nano-catalyst, carbon-supported platinum technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of low mixing efficiency, inability to transport ultrasonic devices, large slurry loss, etc. Improve the turbulent flow energy dissipation rate, wide application prospects, and the effect of less slurry loss

Active Publication Date: 2013-10-02
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing technical methods have the following disadvantages: mechanical stirring and ultrasonic dispersion are carried out separately, the mixing efficiency is low, and the operation under the protective atmosphere cannot be realized
When the device and process are applied to the preparation of carbon-supported platinum nanocatalyst slurry, the following problems will occur: premixing is difficult, the delivery pipeline is easy to block, and cannot be transported to the ultrasonic device; the slurry is easy to stick to the wall of the pipeline during the delivery process, and the slurry is lost major issues
[0007] In addition, all these known nano-dispersion methods and equipment are still unable to realize the nano-particle dispersion process under gas protection

Method used

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  • Device and method for preparing carbon-supported platinum nanometer catalyst slurry
  • Device and method for preparing carbon-supported platinum nanometer catalyst slurry
  • Device and method for preparing carbon-supported platinum nanometer catalyst slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Start the glove box, feed nitrogen, and control the oxygen concentration in the glove box to be lower than 1ppm. In the glove box, 36.4 g of carbon-supported platinum nanocatalysts were weighed by an electronic balance, and the concentration was 909 g of 5 wt % sodium flolon solution, 545 g of deionized water, and 545 g of isopropanol. The inner diameter of the feed tank is 140mm and the height is 200mm. The anchor stirrer, the high-speed shear stirrer and the ultrasonic disperser are fixed on the upper cover of the tank at one end. The anchor stirrer is fixed at the center of the upper cover, and the high-speed shear stirrer and ultrasonic disperser are symmetrically fixed at 1 / 4d from the vertical centerline of the upper cover. The high-speed shear mixer and the ultrasonic generator are installed obliquely, and the angle between the vertical centerline of the mixing tank and the vertical center line is 15 degrees counterclockwise. The distance from the end of the an...

Embodiment 2

[0044] Start the glove box, feed nitrogen, and control the oxygen concentration in the glove box to be lower than 1ppm. In the glove box, 54.6 g of carbon-supported platinum nanocatalyst, 1364 g of 5 wt % sodium flolon solution, 818 g of deionized water, and 818 g of isopropanol were weighed by an electronic balance in the glove box. The inner diameter of the feed tank is 160mm and the height is 230mm. The anchor stirrer, the high-speed shear stirrer and the ultrasonic disperser are fixed on the upper cover of the tank at one end. The anchor stirrer is fixed at the center of the upper cover, and the high-speed shear stirrer and ultrasonic disperser are symmetrically fixed at 1 / 4d from the vertical centerline of the upper cover. The high-speed shear mixer and the ultrasonic generator are installed obliquely, and the angle between the vertical centerline of the mixing tank and the vertical center line is 15 degrees counterclockwise. The distance from the end of the anchor stir...

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Abstract

The invention relates to a device and a method for preparing carbon-supported platinum nanometer catalyst slurry. In the method, a catalyst and liquid are weighed in a glove box under the gas shield, and then the catalyst and the liquid are injected into homogenate equipment, the temperature of the homogenate is controlled by a constant-temperature water bath, and the prepared slurry is discharged into a nanometer slurry storage tank. The homogenate equipment is obliquely provided with a high-speed shear stirrer with a stator structure and a rotor structure, and an ultrasonic generator; meanwhile, high-speed shear jet flow and ultrasonic cavitation are realized, so that the dissipation rate of the local turbulent kinetic energy of a mixed flow field is improved greatly, and the problem of a mixed dead zone is solved by using an anchor type stirrer. According to the invention, the homogenate of nanometer particles with high solid content can be realized without a surfactant or a dispersing agent, so that the difficulty in efficient dispersive homogenate of the impurity-sensitive nanometer particles is solved; the homogenate process is rapid and efficient and is easy to operate; the slurry loss is low; the homogenate process is carried out under the nitrogen protection and is particularly suitable for preparing the nanometer particle slurry which is sensitive to the homogenate environment and easy to oxidize; and the device and the method have wide application prospect.

Description

technical field [0001] The invention relates to a preparation device and method for highly dispersed nanoparticle slurry, in particular to a device and method for preparing carbon-supported platinum nano-catalyst slurry under the combined action of gas protection, ultrasonic wave and high-low speed mechanical stirring. Background technique [0002] The fuel cell membrane electrode (MEA) technology based on CCM (Catalyst Coated Membrane) is a new technology developed in recent years to prepare the fuel cell membrane electrode assembly. The use of CCM technology not only improves the performance of the battery, but also greatly reduces the amount of precious metal catalysts, realizes continuous mass production, and reduces the cost of fuel cells. Regardless of the traditional MEA preparation technology or the CCM-based MEA preparation technology, the degree of dispersion of the nanoscale carbon-supported platinum catalyst in the slurry will directly affect the quality of the M...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B01J37/04B01J37/34B01J23/42
Inventor于新海涂善东白文田唐佳丽杨洁
OwnerEAST CHINA UNIV OF SCI & TECH