Nanoscale platinum-rhodium alloy powder and preparing method thereof

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...

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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 prepare nano-scale alloy powder, but the prepared alloy powder is very easy to agglomerate, which also causes the problem of slurry printing. At the same time, the particle size range of platinum-rhodium alloy powder prepared by hydrometallurgy is very wide (50nm-20μm ), resulting in a high fineness of the slurry, which can easily cause the electrode line to be disconnected during slurry printing

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