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Nitrogen oxide sensor-used platinum-rhodium electrode paste and preparation method thereof

A technology of electrode slurry and nitrogen oxides, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., can solve the problem of poor resolution of pure Pt electrodes

Active Publication Date: 2012-11-28
WUXI LONGSHENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, Pt is mainly used as the catalytic electrode, but since the concentration of nitrogen oxides in the exhaust gas of automobiles is generally below 2000ppm, the resolution of pure Pt electrodes is not good for this low concentration of nitrogen oxides. good

Method used

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Examples

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Effect test

preparation example Construction

[0024] A preparation method of platinum-rhodium electrode slurry for nitrogen oxide sensor, the steps are as follows:

[0025] (1) Production of glass binder: 40% SiO 2 , 20% Al 2 o 3 , 15% Bi 2 o 3 , 15% MgO, 2% CaO, 3% TiO 2 , 3% B 2 o 3 , 2% K 2 O, put it in a ball mill and mix it evenly, put it in a crucible, place it in a muffle furnace and heat it to 1500°C, keep it warm for 30 minutes, quench the molten glass in water and then pulverize it in a ball mill to obtain a particle size of <2 μm and a uniform composition Glass particles, stored for later use;

[0026] (2) Production of organic binder: weigh the organic solvent according to 90-95% of the total weight of the organic binder and place it in a beaker, first add additives to the solvent in accordance with the principle of increasing from less to more, and seal the beaker Place in a water bath and heat to 80°C, stir evenly until the additives are completely dissolved, then weigh the organic resin according t...

Embodiment 1

[0029] A platinum-rhodium electrode slurry (100g) for a nitrogen oxide sensor, the manufacturing process of which is as follows:

[0030] 1. Inorganic binder formula (prepared 100g): SiO 2 40g, AL 2 o 3 20g, Bi 2 o 3 15g; MgO15g; CaO2g; TiO 2 3g; B 2 o 3 3g;K 2 O2g;

[0031] 2. Production method of inorganic binder: Weigh the material according to the above weight, ball mill and mix it in a ball mill tank for 10 hours, take it out and place it in a crucible, heat it in a muffle furnace to 1300°C, keep it warm for 30 minutes, and quench it in high-purity water to obtain fine glass Particles, glass particles are crushed with a planetary ball mill for 4 hours, and the particle size is less than 10 μm;

[0032] 3. Ultra-fine platinum powder is micron powder, with an average particle size of 0.8μm and a bulk density of 1.1g / cm 3 , ultrafine platinum powder is spherical;

[0033] 4. The ultra-fine rhodium powder is a gradient powder: the particle size distribution of...

Embodiment 2

[0048] A platinum-rhodium electrode slurry (100g) for a nitrogen oxide sensor, the manufacturing process of which is as follows:

[0049] 1. Inorganic binder formula (prepared 100g): SiO 2 40g, AL 2 o 3 20g, Bi 2 o 3 15g; MgO15g; CaO2g; TiO 2 3g; B 2 o 3 3g;K 2 O2g;

[0050] 2. Production method of inorganic binder: Weigh the material according to the above weight, ball mill and mix it in a ball mill tank for 10 hours, take it out and place it in a crucible, heat it in a muffle furnace to 1300°C, keep it warm for 30 minutes, and quench it in high-purity water to obtain fine glass Particles, glass particles are crushed with a planetary ball mill for 4 hours, and the particle size is less than 10 μm;

[0051] 3. Ultra-fine platinum powder is micron powder, with an average particle size of 1μm and a bulk density of 1.1g / cm 3 , ultrafine platinum powder is spherical;

[0052] 4. The ultra-fine rhodium powder is a gradient powder: the particle size distribution of t...

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Abstract

The present invention discloses nitrogen oxide sensor-used platinum-rhodium electrode paste and a preparation method thereof. The platinum-rhodium electrode paste is prepared from the following raw materials by mass percentage: 1-10 wt% of an inorganic binder,10-20 wt% of an organic binder, 10-50 wt% of ultrafine rhodium powder, 30-60 wt% of ultrafine platinum powder, and 5-10 wt% of zirconium dioxide. The preparation method comprises: (1) preparing the inorganic binder, (2) preparing the organic binder, (3) weighing the organic binder, the inorganic binder, the ultrafine rhodium powder, the ultrafine platinum powder and zirconium dioxide by taking the preparation of 100 g of platinum-rhodium electrode paste as a reference, adding to the container in accordance with the principle of from less to more, stirring sufficiently for uniform dispersion on adding each material, then grinding by a three-roll mill, removing agglomerated particles, and then stirring for dispersion to obtain the uniformly dispersed paste. The paste is good in printing, drying, and sintering performances and good in adhesion after sintering at high temperature.

Description

technical field [0001] The invention relates to a platinum-rhodium electrode slurry and a manufacturing method thereof, in particular to a platinum-rhodium electrode slurry for a zirconia-based nitrogen oxide sensor and a manufacturing method thereof. Background technique [0002] In view of the current environmental problems and energy tensions, energy conservation and emission reduction has become my country's basic national policy, and the diesel engine industry is facing the challenge of Phase IV emission standards. At present, the Selective Catalytic Reduction (SCR) technology is gradually recognized by most engine companies as a diesel engine emission solution. When the SCR system is performing closed-loop control, the nitrogen oxide sensor is used to detect the nitrogen oxide emission of the diesel engine, so as to control the NH 3 Injection amount, so that the nitrogen oxide emission and NH after passing through the SCR system 3 All leaks meet discharge requirement...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/409G01N27/26B01J23/46
Inventor 尹亮亮倪铭肖琳张华邵兴隆
Owner WUXI LONGSHENG TECH
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