Environmental Applications of Zeolites: Hydrophobic Sn-BEA as a Selective Gas Sensor for Exhaust Fumes

Dubray, F; Jendrlin, M; Grand, J; Lakiss, L; El Fallah, J; Mintova, S; Bazin, P; Zholobenko, V

Abstract

Environmental monitoring of pollutants, such as NOx and COx, which can be facilitated by a range of gas sensors, is of considerable fundamental and practical importance. This work has been focused on the synthesis and evaluation of zeolite beta with tin (Sn-BEA) and dealuminated beta (DeAl-BEA) zeolites. The zeolite samples have been extensively investigated by IR, UV-VIS and NMR spectroscopy, XRD, TGA, and N-2 adsorption-desorption. The prepared Sn-BEA sample is characterised by the submicron particle size, an almost defect-free structure, and high hydrophobicity. Sensors containing selective microporous layers based on Sn-BEA and DeAl-BEA zeolites have been prepared and extensively tested. Both the Sn-BEA and DeAl-BEA zeolites have been deposited in thin films and evaluated as gas sensors for CO, CO2, NO, and NO2 in the presence of water vapour at room temperature. The Sn-BEA zeolite-based sensor showed high selectivity towards NO2, while the DeAl-BEA is selective towards CO2 and NO2.

Citation

Dubray, F., Jendrlin, M., Grand, J., Lakiss, L., El Fallah, J., Mintova, S., …Zholobenko, V. (2023). Environmental Applications of Zeolites: Hydrophobic Sn-BEA as a Selective Gas Sensor for Exhaust Fumes. Chemistry, 334 - 347. https://doi.org/10.3390/chemistry5010025

• Acceptance Date: Feb 16, 2023
• Publication Date: Feb 21, 2023
• Journal: Chemistry
• Print ISSN: 2624-8549
• Publisher: MDPI
• Pages: 334 - 347
• DOI: https://doi.org/10.3390/chemistry5010025
• Keywords: zeolites; BEA; layers; FTIR; gas sensors
• Publisher URL: https://www.mdpi.com/2624-8549/5/1/25