High-purity large-specific-surface platinum black and preparation method thereof

A technology with high specific surface area and specific surface area, which is applied in the field of preparation of platinum black for fuel cells, and can solve problems such as purity and specific surface area that are not mentioned

Active Publication Date: 2018-10-09
SINO PLATINUM METALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • High-purity large-specific-surface platinum black and preparation method thereof
  • High-purity large-specific-surface platinum black and preparation method thereof
  • High-purity large-specific-surface platinum black and preparation method thereof

Examples

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Embodiment 1

[0020] The high-purity spherical ruthenium powder of the present invention is obtained through the following steps:

[0021] (1) Atomization drying process: with high purity (NH 4 ) 2 PtCl 6 Powder is used as raw material, the control liquid flow rate is 6.0 mL / min, the atomization pressure is 0.3MPa, the inlet temperature is 200°C, the hot air flow rate is 7.0L / min, the solution concentration is 0.2mol / l, and the high-purity (NH 4 ) 2 PtCl 6 Spherical particles, particle size is about 0.5 ~ 4μm; (2) microwave calcination process: the high-purity spherical (NH 4 ) 2 PtCl 6 The particles are calcined in two stages in a microwave oven. In the first stage, under the protection of nitrogen, the heating rate is 10°C / min, the temperature is raised to 470°C, kept for 3 hours, and cooled with the furnace; the second stage is hydrogen reduction, under the condition of hydrogen, The heating rate is 15°C / min, the temperature is raised to 600°C, kept for 1h, and cooled with the fur...

Embodiment 2

[0023] The difference from Example 1 is that the atomization and granulation process is as follows: the flow rate of the control liquid is 8.0 mL / min, the atomization pressure is 0.5 MPa, the inlet temperature is 220° C., and the flow rate of hot air is 10.0 L / min. The microwave calcination process is as follows: in the first stage, the temperature is raised from room temperature to 470° C. for 2 hours, and in the second stage, the temperature is raised to 600° C. for 2 hours, and then cooled with the furnace.

Embodiment 3

[0025] The difference from Example 1 is that the atomization and granulation process is as follows: the flow rate of the control liquid is 3.0 mL / min, the atomization pressure is 0.4 MPa, the inlet temperature is 160° C., and the flow rate of hot air is 4.0 L / min. The microwave calcination process is as follows: in the first stage, the temperature is raised from room temperature to 450° C. for 2 hours, and in the second stage, the temperature is raised to 550° C. for 2 hours, and then cooled with the furnace.

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Abstract

The invention discloses a kind of high-purity large-specific-surface platinum black and a preparation method thereof. The prepared platinum black has the average grain size being 2 microns, is spheroid and has the purity greater than 99.99 wt% and the specific surface greater than 27 m<2>/g. The platinum black for fuel cells is subject to reducing preparation through atomizing pelletizing and microwave calcinations. The platinum black has the purity greater than 99.99%, the average grain size being 2 microns and the specific surface greater than 27 m<2>/g and is spheroid. Platinum powder can be used for producing fuel cell electrode materials and has great market demands and wide application prospects. Meanwhile, the platinum powder can also be used for other catalyst fields.

Description

technical field [0001] The invention belongs to the technical field of noble metal catalysis, and in particular relates to a method for preparing platinum black for fuel cells. Background technique [0002] Platinum black with high specific surface area has excellent properties of high reactivity, many surface active sites, high catalytic efficiency and strong adsorption capacity, which makes it have an important application in chemical catalysis. As a high-efficiency catalyst, platinum black with high specific surface area has been widely used in petroleum cracking, automobile exhaust treatment and other fields. With the continuous development of high-tech, the awareness of environmental protection has also been improved. Fuel cell vehicles have begun to develop rapidly. Fuel cells can achieve high efficiency, zero emissions and zero pollution, so there is a good development trend. Platinum black with high purity and high specific surface can be As a cathode catalyst mater...

Claims

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Application Information

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IPC IPC(8): B22F9/22B22F1/00C22C5/04B82Y40/00
CPCC22C5/04B82Y40/00B22F9/22B22F1/065
Inventor 易伟赵盘巢陈家林李继刚俞建树柳森
Owner SINO PLATINUM METALS CO LTD
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