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li-based + or la 3+ Ion-exchange Y-type zeolite ammonia sensor

An ammonia sensor and ion exchange technology, applied in the direction of material resistance, etc., can solve the problems of inoperable detection performance, increased sensor energy consumption, waste, etc., and achieve low power consumption, low operating temperature, and stable and reliable performance

Active Publication Date: 2019-09-27
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ammonia sensor installed in the SCR system, if the operating temperature is lower than the system temperature, its detection performance will be affected by the ambient temperature and cannot work, but if the operating temperature is higher than the system temperature, it will increase the energy consumption of the sensor, resulting in waste

Method used

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  • li-based <sup>+</sup> or la <sup>3+</sup> Ion-exchange Y-type zeolite ammonia sensor
  • li-based <sup>+</sup> or la <sup>3+</sup> Ion-exchange Y-type zeolite ammonia sensor
  • li-based <sup>+</sup> or la <sup>3+</sup> Ion-exchange Y-type zeolite ammonia sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A Y-type zeolite ammonia sensor based on cation exchange is prepared by soaking the zeolite-based sensor in a lithium chloride solution with a concentration of 0.1mol / L and exchanging it on a shaker for 12 hours.

[0036] Specifically, it is prepared by the following preparation method: Weigh a certain amount of Y-type zeolite and put it into a mold, press it into a circular sheet by an oil press, and sinter it in a high-temperature furnace at 600 ° C for 2 hours in an air environment to obtain an area of ​​40 mm. 2 Zeolite flakes with a thickness of 1.0mm;

[0037] Use screen printing technology to print silver paste on both sides of the zeolite sheet as electrodes, and the area of ​​the electrodes on both sides is 30mm 2 , with a thickness of 50 μm, and dot silver wires on the middle of the electrodes on both sides with silver paste, first dry at 80°C for 0.5h, and then sinter in a high-temperature furnace at 600°C for 2h to form electrodes and electrode leads on both...

Embodiment 2

[0040] The only difference from Example 1 is that the cation-exchange-based Y-type zeolite ammonia sensor performs liquid-phase ion exchange by soaking the zeolite-based sensor in a lanthanum nitrate solution with a concentration of 0.1mol / L, and the others are the same as in Example 1. It is not repeated here, and the present embodiment makes a 3+ Ion-exchange Y-type zeolite ammonia sensor.

Embodiment 3

[0042] The only difference from Example 1 is that the sintering temperature of the zeolite flakes is 590°C, the sintering time is 1.5h, and the area of ​​the zeolite flakes is 42mm 2 , thickness is 0.9mm, electrode area is 28mm 2 , with a thickness of 50 μm, first dry at 85°C for 0.8h after spotting the silver wire with silver paste, and then sinter at 590°C for 2.5h in a high-temperature furnace; the concentration of lithium chloride solution is 0.15mol / L, and the others are the same as in Example 1 , which will not be repeated here.

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Abstract

Belonging to the technical field of gas sensitive devices, the invention relates to a Y type zeolite ammonia gas sensor based on Li<+> or La<3+> ion exchange, and the Y type zeolite ammonia gas sensor is applicable to but not limited to concentration detection of ammonia gas in a selective catalytic reduction (SCR) system. The Y type zeolite ammonia gas sensor is prepared by soaking a zeolite-based sensor in a solution and subjecting the sensor to exchange on a shaking table for 10-20h. The solution is lithium chloride solution or lanthanum nitrate solution. And the concentration of the lithium chloride solution and the lanthanum nitrate solution is 0.05-0.2mol / L. The Y type zeolite ammonia gas sensor based on Li<+> or La<3+> ion exchange provided by the invention has the characteristics of high sensitivity response, low working temperature, low power consumption, and stable and reliable performance, and the preparation technology and application of the sensor are very simple.

Description

technical field [0001] The present invention relates to based on Li + or La 3+ The ion-exchanged Y-type zeolite ammonia gas sensor is applicable to but not limited to detecting ammonia gas concentration in a selective catalytic reduction (SCR) system, and belongs to the technical field of gas sensor devices. Background technique [0002] In recent years, with the rapid development of the automobile industry and the rapid growth of the number of automobiles, the air pollution caused by automobile exhaust emissions has received extensive attention. In order to reduce the pollution of motor vehicle exhaust to the air environment, especially for the harmful gas NO in automobile exhaust X The control method adopted is to install a selective catalytic reduction (SCR) system, and inject ammonia gas into the system as a reducing agent, and decompose nitrogen oxides into nitrogen and water under the action of the SCR catalyst. But in order to control the NO in the SCR system X co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
Inventor 郑雁公吴其树简家文
Owner NINGBO UNIV
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