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Preparation method of micron-grade spherical Pt-Ru alloy powder

A technology of micron-scale, alloy powder is applied in the field of preparation of micron-scale spherical Pt-Ru alloy powder, which can solve the problems of unfavorable industrial production and complicated operation process.

Active Publication Date: 2018-07-24
SINO PLATINUM METALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method replaces the alloy with a thin film of platinum and ruthenium, and can be directly used for on-site ATR-SEIRAS research on electrocatalytic adsorption and effects, the operation process of this method is relatively complicated, which is not conducive to its industrial production

Method used

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  • Preparation method of micron-grade spherical Pt-Ru alloy powder
  • Preparation method of micron-grade spherical Pt-Ru alloy powder
  • Preparation method of micron-grade spherical Pt-Ru alloy powder

Examples

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Embodiment 1

[0020] The preparation steps of the micron-scale spherical Pt-Ru alloy powder of the present invention are as follows:

[0021] 1. Spray drying: with (NH 4 ) 2 RuCl 6 and (NH 4 ) 2 PtCl 6 As a raw material, under the premise that the atomic ratio of platinum atoms and ruthenium atoms is 1:1, weigh the corresponding weight, configure it into a solution, and adopt the method of spray drying, control the liquid flow rate to 5.0ml / min, and the atomization pressure to 0.7 MPa, the inlet temperature is 180°C, and the flow rate of hot air is 10.0L / min, and the homogeneously mixed (NH 4 ) 2 RuCl 6 and (NH 4 ) 2 PtCl 6 Powder, the particle size is 1-4μm, its microscopic appearance is as image 3 shown.

[0022] 2. Hydrogen reduction: the uniform spherical precursor powder is calcined in a tube furnace under a hydrogen atmosphere, the temperature is controlled at 650°C, the holding time is 180min, and it is cooled under nitrogen. The particle size range At 1-4μm, the specif...

Embodiment 2

[0024] Compared with Example 1, the process parameters for manufacturing the precursor are the same, the difference is that the calcination temperature is 550 ° C, the holding time of the powder is 150 min, the size of the particles is in the range of 1-4 μm, and its microstructure is as follows: Figure 4b shown.

Embodiment 3

[0026] Compared with Example 1, the process parameters for manufacturing the precursor mixed powder are the same, the difference is that the calcination temperature is 450°C, the holding time of the powder is 120min, the size of the particles is in the range of 1-4μm, and its microstructure is as follows: Figure 4c shown.

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Abstract

The invention discloses a preparation method of micron-grade spherical Pt-Ru alloy powder. The particle size range of the prepared micron-grade Pt-Ru alloy powder is 1-4 [mu]m, the average size of particles is 2.5 [mu]m, and the specific surface range of the Pt-Ru alloy powder is 0.1-42 m<2> / g. Ammonium chloroplatinate [(NH4)2PtCl6] and diammonium hexachlororuthenate [(NH4)2RuCl6] are adopted as precursors of the platinum and ruthenium alloy powder, through combining of spray drying and hydrogen-leading reduction, the micron-grade Pt-Ru alloy powder is prepared. Through spray drying and hydrogen-leading reduction, the Pt-Ru alloy powder with the average size being about 2.5 [mu]m is prepared, the preparation process is simple in technology and high in operability, and meanwhile leading-inof impurities is also avoided.

Description

technical field [0001] The invention belongs to the technical field of noble metal powder metallurgy, and in particular relates to a preparation method of micron-sized spherical Pt-Ru alloy powder. Background technique [0002] Pt-Ru alloy powders are widely used as catalysts in the field of fuel cells. In terms of anti-toxicity, Pt-Ru alloy catalysts have better performance than individual metal Pt catalysts, especially in anti-carbon monoxide poisoning. In the 21st century, the concept of environmental protection is deepening day by day, and the development of new energy sources is also on the agenda. Among them, new energy sources represented by methanol fuel cells have attracted much attention, and platinum-ruthenium alloys have also been deeply studied as anode catalysts for fuel cells. , especially some supported platinum-ruthenium alloy catalysts, the most typical of which is carbon-supported platinum-ruthenium catalysts. For platinum ruthenium catalysts, if the part...

Claims

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Application Information

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IPC IPC(8): B22F9/26
CPCB22F9/26
Inventor 易伟张玉航李继刚郭磊陈家林崔浩孙绍霞
Owner SINO PLATINUM METALS CO LTD
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