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Method for preparing core-shell type nano-porous platinum alloy catalyst

A nanoporous, platinum-based alloy technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve complex processes, unfavorable promotion and application, and inability to batch Production and other issues, to achieve the effect of convenient regulation, high production efficiency and simple process

Inactive Publication Date: 2013-04-24
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above methods can prepare nanoscale Pt-based alloy catalysts, there are problems such as complex process and the need to precisely control experimental conditions, so it cannot be mass-produced, and it is difficult to control the alloy ratio, which is not conducive to industrial application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] (1) Weigh pure Al powder, pure Ni powder and pure Pt powder (purity ≥ 99.5%, mass ratio) in sequence according to the atomic percentage of 70% Al, 29% Ni and 1% Pt, weighing 30g in total. Adopt zirconia ball mill tank, weigh zirconia balls according to the ball-to-material ratio of 15:1, wherein the mass ratio of the balls with diameters of 10 mm, 6 mm, and 4 mm is 1:1:1, and weigh the grinding aid (stearin acid), its weight is 1% (mass ratio) of the metal powder.

[0014] (2) Add the powder and balls into the ball mill tank in the order of "ball first, then feed", set the speed of the high-energy ball mill to 300 rpm, stop for 10 minutes every 30 minutes, set the automatic forward and reverse, The ball milling time is 150 hours, and the Al-Pt-Ni alloy powder is obtained after the ball milling treatment.

[0015] (3) Prepare a 2M (M=mol / L, the same below) aqueous solution of sodium hydroxide with analytically pure reagents and distilled water, prepare a 2M aqueous solu...

Embodiment 2

[0018] (1) Weigh pure Al powder, pure Ni powder and pure Pt powder (purity ≥ 99.5%, mass ratio) in sequence according to the atomic percentage of 60% Al, 30% Ni and 10% Pt, weighing 30g in total. Adopt zirconia ball mill pot, weigh zirconia balls according to the ball-to-material ratio of 20:1, wherein the mass ratio of 10 mm, 6 mm, and 4 mm diameter balls is 1:1:1, and weigh the grinding aid (stearin acid), its weight is 1% (mass ratio) of the metal powder.

[0019] (2) Put the powder and balls into the ball mill tank according to the order of "ball first, then feed", set the speed of the high-energy ball mill to 200 rpm, stop for 10 minutes every 30 minutes, set the automatic forward and reverse, The ball milling time is 200 hours, and the Al-Pt-Ni alloy powder is obtained after the ball milling treatment.

[0020] (3) Use analytical reagents and distilled water to prepare 0.2M potassium hydroxide aqueous solution, use concentrated nitric acid and distilled water to prepare...

Embodiment 3

[0023] (1) Weigh pure Al powder, pure Ni powder and pure Pt powder (purity ≥ 99.5%, mass ratio) in sequence according to the atomic percentage of 80% Al, 15% Ni and 5% Pt, weighing 30g in total. Adopt zirconia ball mill tank, weigh zirconia balls according to the ratio of ball to material 30:1, wherein the mass ratio of the diameters of 10 mm, 6 mm, 4 mm balls is 1:1:1, weigh the grinding aid (stearin acid), its weight is 1% (mass ratio) of the metal powder.

[0024] (2) Add the powder and balls into the ball mill tank in the order of "ball first, then feed", set the speed of the high-energy ball mill to 400 rpm, stop for 10 minutes every 30 minutes, set the automatic forward and reverse, The ball milling time is 100 hours, and the Al-Pt-Ni alloy powder is obtained after the ball milling treatment.

[0025] (3) Use analytical reagents and distilled water to prepare 5M aqueous sodium hydroxide solution, use concentrated nitric acid and distilled water to prepare 8M aqueous nit...

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PUM

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Abstract

The invention belongs to the technical field of nanometallic materials, and relates to a method for preparing a core-shell type nano-porous platinum alloy catalyst. The method comprises the following steps of: weighing pure Al powder, pure Pt powder and pure X element powder according to an alloy composition proportion of Al-Pt-X (X is at least one of Ni, Co, Cu, Fe or Ti), and mechanically alloying the weighed pure Al powder, pure Pt powder and pure X element powder in a ball grinding mill to obtain Al-Pt-X alloy powder; and de-alloying the Al-Pt-X alloy powder in an alkaline solution and an acid solution sequentially, selectively removing Al element and partial X element, thus obtaining the core-shell type nano-porous platinum alloy catalyst. A mechanical alloying method is adopted to prepare a precursor alloy, the technology is simple, the production efficiency is greatly increased, the obtained nano-porous platinum-base alloy is small in size and of a core-shell type nano-porous structure, and the catalyst has a high specific surface area and can serve as a fuel cell catalyst.

Description

technical field [0001] The invention belongs to the field of nano-metal material preparation, and in particular relates to a preparation method of a core-shell nanoporous platinum-based alloy catalyst. Background technique [0002] With the environmental pollution caused by the excessive use of traditional fossil fuels and the energy crisis caused by the depletion of fossil fuels, the development of sustainable energy and efficient energy conversion devices has attracted more and more attention. Among them, fuel cells are more and more popular due to their advantages of environmental friendliness and designability. Proton exchange membrane fuel cells (PEMFC) exhibit the highest power density among all fuel cell types, and at the same time have the characteristics of the fastest start-up and switch cycles, so they are very suitable for portable power sources and transportation vehicles, and are more advanced in terms of technology and applications. prospect. [0003] In the...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J35/02
Inventor 张忠华孙俊哲张弛
Owner SHANDONG UNIV
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