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Oxidation of NO Into NO 2 by Surface Adsorbed O Atoms
Author(s) -
Guaitella O.,
Hübner M.,
Marinov D.,
Guerra V.,
Pintassilgo C.D.,
Welzel S.,
Röpcke J.,
Rousseau A.
Publication year - 2011
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.201000068
Subject(s) - chemisorption , adsorption , chemistry , plasma , analytical chemistry (journal) , molecule , absorption (acoustics) , atom (system on chip) , phase (matter) , infrared spectroscopy , oxygen , materials science , organic chemistry , physics , quantum mechanics , computer science , composite material , embedded system
Plasma‐surface interactions are increasingly recognised as a key factor in explaining molecule production and conversion processes. In order to scrutinise such effects well‐defined surface and gas phase conditions are required. Hence, the inner surface of a Pyrex tube was treated by a capacitively coupled RF plasma at low pressure. The post‐plasma oxidation of gas mixtures containing 1 % NO into NO 2 has been studied by means of quantum cascade laser absorption spectroscopy in the mid‐infrared spectral range. The plasma pre‐treatment experiments with oxygen containing precursors suggest O atom adsorption on the Pyrex tube with a surface density of 2.7 x 10 14 cm –2 . A simple kinetic model was developed and shows good agreement with the measured NO and NO 2 gas phase concentrations. In the model a fraction of the surface is considered to be covered with chemisorption sites where atoms and molecules can be adsorbed, whereas they can be removed only by recombination (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)