首页| Identification of an efficient adsorbent for ethanol sensing at room temperature using quartz crystal microbalance
Identification of an efficient adsorbent for ethanol sensing at room temperature using quartz crystal microbalance
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Zeolite coated quartz crystal microbalance (QCM) is proposed as an efficient sensor for the detection of ethanol at room temperature. In this work, three zeolites DaY, ZSM-5, and BEA were investigated in order to determine the most efficient adsorbent for ethanol sensing at room temperature. The sensing performances were found to be mostly influenced by the acid site density and the zeolite's pore size. The BEA coated QCM sensor exhibited the best performances with a high relative frequency shift from 9.0 x 10~(-7) to 2 x 10~(-6) for 10 ppm of ethanol. Furthermore, this sensor exhibited fast response and recovery times which makes it a suitable material for the monitoring of ethanol in the air. In addition, the ethanol diffusion order was evaluated using Fickian diffusion law and was found to be the highest for the zeolite BEA. A sensing mechanism was also proposed for the adsorption and desorption of ethanol into zeolites based on unstable protonated dimers, water and diethyle ether resides for the energy-efficient ethanol sensor.
ZeolitesBronsted and Lewis acid sitesAdsorption-desorptionAdsorbent coated QCM sensorRelative frequency shift
Mohit Kumar、Achraf EL. Mohajir、Franck Berger
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Institut FEMTO-ST, UMR CNRS 6174, Universite Bourgogne Franche-Comte, 15B Avenue des montboucons, 25030, Besancon, France
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