Nanoscale platinum-rhodium alloy powder and preparing method thereof

A platinum-rhodium alloy, nano-scale technology, applied in the field of nano-scale platinum-rhodium alloy powder and its preparation, can solve the problems of high slurry fineness, easy agglomeration of alloy powder, open circuit of electrode wires, etc., achieve good printing performance and avoid agglomeration The effect of the phenomenon

Active Publication Date: 2017-05-10
GRIKIN ADVANCED MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The particle size of the platinum-rhodium alloy powder prepared by the traditional physical ball milling method is generally above 1 μm. The electrode slurry prepared by this powder is not conducive to the preparation of catalytic electrodes by screen (360 mesh) printing, and the powder particles are too large, causing the blockage of the mesh screen; use The method of hydrometallurgy can pre

Method used

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  • Nanoscale platinum-rhodium alloy powder and preparing method thereof
  • Nanoscale platinum-rhodium alloy powder and preparing method thereof
  • Nanoscale platinum-rhodium alloy powder and preparing method thereof

Examples

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Effect test

Embodiment 1

[0027] A kind of platinum rhodium alloy powder (5g), preparation technology is as follows:

[0028] (1) Preparation of platinum-rhodium mixed solution: use deionized water to dissolve chloroplatinic acid and hydrated rhodium trichloride solid, Pt 4+ with Rh 3+ The mass ratio of is 2:3, obtains platinum-rhodium mixed solution 1L, in mixed solution Pt 4+ with Rh 3+ The concentration sum is 5g / L;

[0029] (2) Adjustment of the pH of the platinum-rhodium mixed solution: the pH value of the mixed solution in (1) is prepared using ammonia water to be 3;

[0030] (3) Preparation of dispersant: the mass fraction of glycerin dispersant prepared by deionization is 4%;

[0031] (4) Reduction: get the mixed solution in step (2), put into five 250ml polytetrafluoroethylene respectively in the stainless steel reaction kettle of liner, each reaction kettle adds the hydrazine hydrate reducing agent of 2ml, each reaction Add 1ml of the dispersant in step (3) to the kettle, stir evenly, an...

Embodiment 2

[0038] A kind of platinum rhodium alloy powder (10g), preparation technology is as follows:

[0039] (1) Preparation of platinum-rhodium mixed solution: use deionized water to dissolve chloroplatinic acid and hydrated rhodium trichloride solid, Pt 4+ with Rh 3+ The mass ratio of is 1:1, obtains platinum-rhodium mixed solution 1L, in mixed solution Pt 4+ with Rh 3+ The concentration sum is 10g / L;

[0040] (2) Adjustment of the pH of the platinum-rhodium mixed solution: use sodium fluoride to prepare the pH value of the mixed solution in (1) to be 4;

[0041] (3) Preparation of dispersant: the mass fraction of polyvinyl alcohol dispersant prepared by deionization is 10%;

[0042] (4) Reduction: Take the mixed solution in step (2), put it into five 250ml polytetrafluoroethylene-lined stainless steel reaction kettles, add 5ml of formaldehyde reducing agent to each reaction kettle, and add 5ml of formaldehyde reducing agent to each reaction kettle. In step (3), add 1ml of disp...

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Abstract

The invention discloses nanoscale platinum-rhodium alloy powder and a preparing method thereof, and belongs to the field of preparing nano metal materials. The size distribution of the platinum-rhodium alloy powder is 50-100 nm, the average particle size is 65 nm, the open setting density is 1.2-1.6 g/cm<3>, and the tapping density is 1.8-2.0 g/cm<3>. The platinum-rhodium alloy powder is prepared through a hydrothermal method, and a chloroplatinic acid and rhodium trichloride mixed solution, an organic reducing agent and a dispersing agent are put into a stainless steel reaction kettle with a polytetrafluoroethylene lining and heated for a period of time to prepare the nanoscale platinum-rhodium alloy powder. The alloy powder prepared through the method is small in particle size, size distribution is concentrated, the nanoscale platinum-rhodium alloy powder can be used for preparing a catalytic electrode of a NOx sensor, and the preparing method is simple, easy to implement and beneficial for industrial production.

Description

technical field [0001] The invention belongs to the technical field of nano-metal material preparation, and in particular relates to a nano-scale platinum-rhodium alloy powder and a preparation method thereof. Background technique [0002] NO in automobile exhaust x , HC, CO and particulate matter are the main causes of environmental pollution such as haze, acid rain, photochemical smog, and ozone layer destruction. Vehicle exhaust has become the primary source of air pollution in large and medium-sized cities. NO x The sensor is a kind of precise and selective detection of NOx molecules in diesel vehicle exhaust through noble metal catalytic electrodes, and then realizes the control of the SCR system, and the poisonous NOx x The gas becomes non-polluting N 2 , CO 2 sensor. [0003] The catalytic electrode is NO x Sensor can accurately measure NO x The key electrode of the concentration, its performance determines the chip NO x The quality of the sensor. The particl...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B22F9/24B22F1/054
Inventor 关俊卿陈峤贺昕滕海涛罗瑶陈斐熊晓东李治宇
Owner GRIKIN ADVANCED MATERIALS
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