Sensor for measuring the total content of nitrogen oxides in mixed gas

A technology of nitrogen oxides and mixed gas, applied in the direction of material resistance, etc., can solve the problems of large interference, low-concentration NOX precision, complex sensor control process, etc., and achieve the effect of simple control process, sensitive detection, and simple structure

Active Publication Date: 2014-10-29
CHINA FIRST AUTOMOBILE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large interference of oxygen on the detection electrode, multiple oxygen pump batteries and oxygen sensitive batteries are required to w

Method used

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  • Sensor for measuring the total content of nitrogen oxides in mixed gas
  • Sensor for measuring the total content of nitrogen oxides in mixed gas
  • Sensor for measuring the total content of nitrogen oxides in mixed gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] For verifying the effect of the present invention made one such as figure 1 The sensor of the structure shown. Grind zirconia yttrium powder (yttrium doping content 8mol%) and alumina balls into slurry, cast and dry to make 0.8mm thick biscuit, cut the biscuit into 200mm×200mm square, substrate The preparation method of 1 is to take a piece of cut zirconia yttrium green blank and print platinum lead wires and oxygen pump electrodes 8a, 8b on its upper and lower surfaces by screen printing. After drying, a layer of LaMnO is screen-printed on the surface of electrode 8b. 3 Slurry 8c, dry. Take another piece of cut zirconia yttrium biscuit, according to image 3 The positions shown are perforated to form the substrate 2 . The substrate 3 is to screen-print platinum lead wires and platinum oxygen-sensitive electrodes 9a, 9b on the upper and lower surfaces of the cut zirconia yttrium blank, and print gold detection electrodes 10a, 10b on the same side of the electrode 9a...

Embodiment 2

[0040] like figure 2 As shown, except that the manufacturing process of the oxygen pump electrode 8b in the first chamber is changed to screen printing a layer of platinum and LaMnO on the lower surface of the substrate 1 3 Except for the slurry prepared by mixing, the others are exactly the same as the first embodiment.

Embodiment 3

[0042] In addition to changing the detection electrode gas-sensitive material 11 in the second chamber to In 2 o 3 Other than that, it is exactly the same as the second embodiment. Catalyst In 2 o 3 As the gas sensitive material 11, in order to evaluate the effect of this change, test the sensor C in the concentration range from 10 to 500ppm of NO content, the relationship curve between resistance and NO concentration ( Figure 4 ), the experimental results are as follows Figure 4 As shown, the figure shows that the sensor C shows a more obvious resistance change than the sensor described in Example 1 under the same concentration of NO, indicating that this improvement helps to reduce the NO 2 adsorption, thereby improving the sensitivity of the sensor.

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Abstract

The invention relates to a sensor for measuring the total content of nitrogen oxides in mixed gas. The sensor is characterized in that: the sensor comprises two inner chambers and a diffusion slit between the chambers, the first chamber is provided with an oxygen pump cell, gas to be measured can enter the first chamber, and the oxygen pump cell pumps oxygen in the gas to be measured into the chamber and oxidizes NO in the NOx mixed gas to be measured into NO2. The NO2 gas enters the second chamber through the diffusion slit between the two chambers. The second chamber is provided with a concentration cell capable of detecting the oxygen concentration in the chamber. The concentration cell and the oxygen pump cell are cooperated to allow the oxygen concentration in the second chamber to be constant and to guarantee that the oxygen in the first chamber is excessive. The second chamber is also provided with two NO2 detection electrodes. The position between the two electrodes is coated with a NO2 sensitive material. Measurement is performed by detecting the resistance value between the electrodes. The resistance value is corresponding to the NO2 concentration so as to reflect the total content of the NOx.

Description

technical field [0001] The invention relates to a sensor for measuring the total amount of nitrogen oxides in mixed gas, especially a sensor directly exposed to automobile exhaust gas for measuring the total concentration of NOX. The invention can also be used for the detection of the environment in the tunnel and the total amount of NOX in the factory exhaust. Background technique [0002] With the increasing number of automobiles, automobile exhaust pollution has surpassed old-fashioned industrial pollution and has become the "culprit" of air pollution. Nitrogen oxides (NO, NO) in automobile exhaust 2 , N 2 o 3 etc.), collectively known as NOX, are participants in the photochemical reactions that produce modern "smog", which seriously damages human health and the surrounding environment. In order to reduce the concentration of nitrogen oxides in automobile exhaust, it is urgent to develop NOx sensors that can continuously monitor NOx concentration in real time and can b...

Claims

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Application Information

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IPC IPC(8): G01N27/12
Inventor 王金兴张克金张斌许德超王丹魏传盟
Owner CHINA FIRST AUTOMOBILE
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