Gas-sensitive coating and preparation method for monitoring CO and NO2 content of alcohol-based fuel tail gas

A coating and gas-sensing technology, applied in the field of real-time monitoring of alcohol-based fuel tail gas content of gas-sensing coatings and their preparation, can solve the problems of lack of integrated gas-sensing sensors for multiple gases, single, etc., and achieve high reliability and reliability. The effect of practicality, good selectivity and high detection sensitivity

Active Publication Date: 2021-01-15
GUILIN UNIVERSITY OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the existing technologies are all gas sensors for single gas detection. The gas sensor is a single coating, and there is a lack of integrated gas sensors for multiple gases. However, the combustion exhaust of alcohol-based fuels is not a single component in the actual state. , but contains a variety of components, the main components of which have been tested are carbon monoxide and nitrogen dioxide

Method used

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  • Gas-sensitive coating and preparation method for monitoring CO and NO2 content of alcohol-based fuel tail gas
  • Gas-sensitive coating and preparation method for monitoring CO and NO2 content of alcohol-based fuel tail gas
  • Gas-sensitive coating and preparation method for monitoring CO and NO2 content of alcohol-based fuel tail gas

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preparation example Construction

[0024] The invention provides a method for preparing a gas-sensitive coating, comprising the following steps:

[0025] S101: pretreating the ceramic pipe fittings, and then drying them. Wherein, the pretreatment includes: ultrasonically cleaning the ceramic pipe fittings with distilled water, and continuing to perform ultrasonic cleaning with absolute ethanol after drying.

[0026] S102: Mix the raw material components of the gas-sensitive coating with distilled water to prepare a slurry.

[0027] S103: dipping both ends of the dried ceramic tube in S101 step by step in the slurry, drying and cooling. Wherein, the dipping and pulling method is adopted, and the number of times of dipping and pulling is 1 to 8 times.

[0028] S104: Sintering the product obtained in S103 to finally obtain a gas-sensitive coating. Wherein, the specific sintering conditions are as follows: the heating rate is 5°C / min, the sintering temperature is 400°C-500°C, and the sintering time is 2h.

[00...

Embodiment 1

[0031] Example 1 SnO 2 doped BaTiO 3 Preparation of the CO sensitive element

[0032] (1) Preparation of SnO 2 Nanoparticles

[0033] SnO 2 The specific preparation process of nanoparticles is: accurately weigh 5.0g SnCl 4 Grind in an agate mortar for 20 min until no granular solids are present. Transfer to a 50.0mL beaker, add 50.0mL of 2.0mol / L ammonia water drop by drop and stir. After the sol is formed, continue to add ammonia water dropwise until the sol and ammonia water are clearly separated (pH=2). After standing for 10min, filter, collect the filter residue and Dry (120°C). Grind to powder after drying, transfer to muffle furnace for sintering for 2h (500°C, heating rate: 5°C / min) to obtain white SnO 2 powder.

[0034] (2) Preparation of CO sensitive element

[0035] The specific process for the preparation of the CO sensitive element is: use a high-alumina ceramic tube with Φ of 1 mm and d of 5 mm. The ceramic tube should be pretreated before slurry coating....

Embodiment 2

[0036] Embodiment 2 WO 3 doped SnO 2 NO 2 Sensitive component preparation

[0037] (1) Preparation of WO 3 Nanoparticles

[0038] WO 3 The specific preparation process of nanoparticles is as follows: accurately weigh 5.0 g of sodium tungstate dihydrate and grind it in an agate mortar for 20 minutes until there is no granular solid. Transfer to a 50.0mL beaker, add 10.0mL of distilled water, and then add 1g of citric acid to dissolve. Add 50.0mL 2.0mol / L HCl solution dropwise, after the sol is formed, continue to add HCl solution dropwise until the sol and HCl solution are clearly separated, then add 50.0mL 2.0mol / L ammonia water dropwise and stir, and adjust the pH to 2 Stop the dropwise addition, let it stand for 10 minutes and then filter, collect the filter residue and dry it (120°C). Grind to powder after drying, transfer to muffle furnace for sintering for 2h (500°C, heating rate: 5°C / min), to obtain light yellow WO 3 powder.

[0039] (2)NO 2 Sensitive component...

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Abstract

The invention relates to a gas sensitive coating layer for monitoring contents of CO and NO2 in alcohol-based fuel tail gas in real time and a preparation method of the gas sensitive coating layer. The preparation method comprises the following steps: pretreating a ceramic pipe fitting; mixing raw material components of the gas sensitive coating layer with distilled water to prepare slurry; soaking two ends of the dried ceramic pipe in the slurry step by step, and then drying and cooling both ends; sintering a cooled product, and finally obtaining the gas sensitive coating layer. The gas sensitive coating layer prepared through the method disclosed by the invention has a smooth surface which is free of thin film cracking; real-time monitoring for two types of tail gases, such as CO and NO2, in a combustion process of alcohol-based fuel can be realized, furthermore, the gas sensitive coating layer is excellent in detection sensitivity and selectivity; the CO detection range is 1.0 to 300 ppm, and the NO2 detection range is 2.0 to 100 ppm. In addition, a detection result of the gas sensitive coating layer disclosed by the invention is matched with a gas chromatography measurement result, which indicates that the gas sensitive coating layer is high in reliability and has an extensive value in use.

Description

technical field [0001] The invention relates to the technical field of environmental monitoring, in particular to a gas-sensitive coating for real-time monitoring of alcohol-based fuel tail gas content and a preparation method thereof. Background technique [0002] Alcohol-based fuel is similar to liquefied petroleum gas. It can replace liquefied petroleum gas as a civil fuel. It has the advantages of abundant sources, environmental protection, easy production and high thermal efficiency. However, due to formula and process problems, in practical applications, toxic and harmful gases such as carbon monoxide and nitrogen dioxide are often accompanied by insufficient combustion. Detection of carbon monoxide and nitrogen dioxide in the combustion products can effectively monitor the combustion of alcohol-based fuels. Improve the raw material formula and combustion process fundamentally. Existing alcohol-based fuel combustion tail gas monitoring mainly relies on extracting the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 李建平张连明陶积勇卢昌锐李力栾昕奇梁社连
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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