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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

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


Authors

F Dubray

M Jendrlin

J Grand

L Lakiss

J El Fallah

S Mintova

P Bazin

V Zholobenko



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.

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

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