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Automobile emission detection oriented YSZ-based mixed-potential type NOx sensor and preparation method

A mixed potential type and automobile exhaust technology, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of NSC prone to sulfur poisoning, high oil quality requirements, etc., and achieve fast response recovery and raw materials The effect of low price and stable performance

Inactive Publication Date: 2018-10-02
JIANGSU AOLIWEI SENSING TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The best working temperature range of NSC is 250-500°C, but in this temperature range, NSC is prone to sulfur poisoning, so the sulfur content in gasoline must be reduced to a minimum, and the oil quality is very high; when NSC When the reaction temperature is increased above 650oC, sulfur can be removed by combustion. When driving at high speed, NSC can maintain such a high temperature, but when driving in the city (medium and low speed driving), the temperature drops, and it is difficult to remove the sulfur attached to NSC. It is necessary to monitor the working status of the NSC through the NOx sensor to determine the timing of increasing the exhaust gas temperature for sulfur removal

Method used

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  • Automobile emission detection oriented YSZ-based mixed-potential type NOx sensor and preparation method
  • Automobile emission detection oriented YSZ-based mixed-potential type NOx sensor and preparation method
  • Automobile emission detection oriented YSZ-based mixed-potential type NOx sensor and preparation method

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Effect test

Embodiment 1

[0030] The NiO sensitive electrode material was prepared by co-precipitation method, and the industrialized YSZ-based mixed potential NO was produced by screen printing. 2 Vehicle-mounted sensors and test the gas-sensing characteristics of the sensors, the specific process is as follows:

[0031] (1) Weigh NiCl 2 ·6H 2 O 4.5g, configure 0.15mol / L NiCl 2 Solution 90mL, put it in a beaker; use a graduated cylinder to measure 8ml of ammonia water, and according to the ratio of ammonia water to water volume ratio of 1:10, configure ammonia solution, put it in another beaker; put the prepared NiCl 2Place the solution in a water bath with a water bath temperature of 50°C, use a separatory funnel to drop ammonia water into the NiCl2 solution, and titrate NiCl with the ammonia solution at a rate of 8 seconds. 2 solution, so that the solution stops when the pH=7, and a flocculent precipitate is obtained; the precipitate is centrifuged and washed 5 times by a centrifuge until AgNO is...

Embodiment 2

[0039] The NiO sensitive electrode material was prepared by co-precipitation method, and the industrialized YSZ-based mixed potential NO was produced by screen printing. 2 Vehicle-mounted sensors and test the gas-sensing characteristics of the sensors, the specific process is as follows:

[0040] (1) Weigh NiCl 2 ·6H 2 O 4.74g, configure 0.2mol / L NiCl 2 Solution 100mL, put in a beaker; use a measuring cylinder to measure 10ml of ammonia water, and according to the ratio of ammonia water to water volume ratio of 1:10, configure the ammonia solution, put it in another beaker; put the prepared NiCl 2 Place the solution in a water bath with a water bath temperature of 60°C, use a separatory funnel to drop ammonia water into the NiCl2 solution, and titrate NiCl with the ammonia solution at a rate of 10 seconds. 2 solution, so that the solution stops when pH=8, and flocculent precipitates are obtained; the precipitates are centrifuged and washed 6 times by a centrifuge until AgNO...

Embodiment 3

[0048] The NiO sensitive electrode material was prepared by co-precipitation method, and the industrialized YSZ-based mixed potential NO was produced by screen printing. 2 Vehicle-mounted sensors and test the gas-sensing characteristics of the sensors, the specific process is as follows:

[0049] (1) Weigh NiCl 2 ·6H 2 O 5g, configure 0.25mol / L NiCl 2 Solution 110mL, put in a beaker; use a measuring cylinder to measure 12ml of ammonia water, and according to the ratio of ammonia water to water volume ratio of 1:10, configure ammonia solution, put it in another beaker; put the prepared NiCl 2 Place the solution in a water bath with a water bath temperature of 80°C, use a separatory funnel to drop ammonia water into the NiCl2 solution, and titrate NiCl with the ammonia solution at a rate of 15 seconds. 2 solution, so that the solution stops when pH=9, and flocculent precipitates are obtained; the precipitates are centrifuged and washed 8 times by a centrifuge until AgNO is ad...

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Abstract

The invention discloses an automobile emission detection oriented YSZ-based mixed-potential type NOx sensor in the field of gas sensors. The NOx sensor is composed of a strip-shaped YSZ substrate printed with a Pt heating electrode, a Pt reference electrode and a NiO sensitive electrode, wherein the reference electrode and the sensitive electrode are used for respectively printing reference electrode slurry and sensitive electrode slurry at two ends of an upper surface of the strip-shaped YSZ substrate by virtue of a silk-screen printing technology. The NOx sensor disclosed by the invention isexcellent in stability and has a novel practical structure. According to the sensitive electrode layer printed by silk-screen printing, the reference electrode layer and the Pt heating electrode, large-scale batch production can be realized, resources and time are effectively saved, and the sensor has practicality and can be applied to automobile emission detection.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, and in particular relates to a strip-shaped YSZ-based mixed potential NOx sensor with NiO as a sensitive electrode material and a preparation method thereof, which is mainly used for detecting NOx in automobile tail gas. Background technique [0002] In the process of industrialization, environmental pollution is always an unavoidable topic closely related to the living environment of human beings. In recent years, the popularity of words such as PM2.5 and urban smog in our country reflects the serious harm of industrialization to the living environment of human beings. The solid suspended particles produced by automobile exhaust, factory blast furnace exhaust gas, etc. are the main cause of smog, and what is more serious is that it forms compound pollution with environmental pollution gases or pollutants (such as NOx, CO, HC, lead and sulfur oxides) , pose a greater threat to human health. ...

Claims

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Application Information

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IPC IPC(8): G01N27/407G01N27/406
CPCG01N27/4074G01N27/4067G01N27/407G01N27/4075G01N27/4076
Inventor 卢革宇梁喜双刘方猛郝熙冬孙海鑫顾常飞顾天刚李卫
Owner JIANGSU AOLIWEI SENSING TECH
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