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Article Dans Une Revue Journal of Physics D: Applied Physics Année : 2014

NO oxidation on plasma pretreated Pyrex: the case for a distribution of reactivity of adsorbed O atoms

V. Guerra
  • Fonction : Auteur
Olivier Guaitella
Antoine Rousseau

Résumé

The formation of NO 2 molecules on a Pyrex surface, as a result of NO oxidation by adsorbed O atoms on the wall, is experimentally demonstrated and quantified. The measurements reveal that the characteristic times of heterogeneous NO 2 production and NO gas phase decay change from ?60 to ?1500 s as the gas phase concentration of NO introduced in a tube pretreated with an oxygen radiofrequency discharge increases from 10 13 to 10 15 cm ?3 . Moreover, a clear variation of the characteristic loss frequency of NO molecules when small amounts of NO are successively injected in the tube is detected, between ?7 × 10 ?2 and ?5 × 10 ?3 s ?1 . The complex surface kinetics observed is studied and interpreted with the help of a mesoscopic surface model accounting for Eley?Rideal NO oxidation and slow NO 2 adsorption, confirming the existence of adsorption sites possessing a distribution of reactivity on the surface.
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Dates et versions

hal-01549372 , version 1 (28-06-2017)

Identifiants

Citer

V. Guerra, Daniil Marinov, Olivier Guaitella, Antoine Rousseau. NO oxidation on plasma pretreated Pyrex: the case for a distribution of reactivity of adsorbed O atoms. Journal of Physics D: Applied Physics, 2014, 47 (22), pp.224012. ⟨10.1088/0022-3727/47/22/224012⟩. ⟨hal-01549372⟩
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