NOx adsorption onto dehydroxylated or hydroxylated tin dioxide surface. Application to SnO2-based

Abstract : SnO2-based sensors present strong interactions with NOx-containing atmospheres. For this reason, it is fundamental to identify the nature of the adsorbed species resulting from the interaction of NO and NO2 with the tin oxide surface. This aspect has been studied in literature by Temperature Programmed Desorption (TPD). To state more precisely structures of adsorbed species, we link TPD with Diffuse Reflectance Fourier Transform Spectroscopy (DRIFTS). Concerning NO2 adsorption, DRIFTS experiments indicate the formation of monodentate nitrato species at room temperature. By increasing the temperature, a conversion of adsorbed species is observed. The nature of surface groups is discussed. In the presence of hydroxyl groups (two different OH groups are evidenced), the formation of hydrogeno nitrates is detected.
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Sensors and Actuators B: Chemical, Elsevier, 2000, 62 (1), pp.67-72. 〈10.1016/S0925-4005(99)00376-7〉
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https://hal-emse.ccsd.cnrs.fr/emse-00610000
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Soumis le : mercredi 20 juillet 2011 - 16:49:32
Dernière modification le : jeudi 8 février 2018 - 11:08:08

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Emmanuel Leblanc, Laurent Périer-Camby, Gérard Thomas, Michel Primet, Patrick Gelin. NOx adsorption onto dehydroxylated or hydroxylated tin dioxide surface. Application to SnO2-based. Sensors and Actuators B: Chemical, Elsevier, 2000, 62 (1), pp.67-72. 〈10.1016/S0925-4005(99)00376-7〉. 〈emse-00610000〉

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