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Efficient NH₃ Detection Based on MOS Sensors Coupled with Catalytic Conversion.

Boxuan Yang¹, Xian Li², Wenjing Yuan³

¹Tianjin Key Laboratory of Electronic Materials and Devices, School of Electronic and Information Engineering, Hebei University of Technology, Tianjin 300401, China.

|May 26, 2020

Summary

This study presents a novel method for detecting ammonia (NH3) using metal-oxide-semiconductor (MOS) gas sensors and platinum-supported catalysts. The catalytic conversion enhances sensor sensitivity and selectivity for accurate NH3 monitoring.

Keywords:

In2O3 NH3 Pt catalysts WO3 catalytic conversion gas sensors

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Area of Science:

Materials Science
Chemical Engineering
Sensor Technology

Background:

Metal-oxide-semiconductor (MOS) gas sensors exhibit high sensitivity to nitrogen dioxide (NO2) but low response and poor selectivity to ammonia (NH3).
Cross-sensitivity to interfering gases like carbon monoxide (CO) and ethanol complicates accurate NH3 detection with conventional MOS sensors.

Purpose of the Study:

To develop a sensitive and selective NH3 detection method using MOS gas detectors.
To improve the performance of MOS sensors for NH3 by employing a catalytic conversion strategy.

Main Methods:

Preparation of platinum-supported catalysts (Pt-loaded HZSM-5 and Al2O3) via wet impregnation.
Fabrication of MOS gas detectors using nanosized indium oxide (In2O3) and tungsten oxide (WO3) via screen-printing.
Catalytic conversion of NH3 into NO2 for enhanced detection by MOS sensors.

Main Results:

The proposed method enabled MOS sensors to detect NH3 with high sensitivity down to 0.25 ppm.
The catalytic conversion significantly improved NH3 selectivity by combusting interfering reducing gases into CO2 and water.
MOS sensors based on In2O3 and WO3 showed enhanced response to NH3 after catalytic conversion.

Conclusions:

The catalytic conversion approach offers a promising solution for sensitive and selective NH3 detection using MOS gas sensors.
This concept has potential for broader gas sensing applications by adapting catalysts and detectors.
The study highlights the utility of integrating catalysis with MOS sensor technology for improved gas analysis.