Oxidation of NO Into NO2 by Surface Adsorbed O Atoms

• Type: Article in International Scientific Journal
• Date: 2011

Authors

Guaitella, O (Author) Other; Huebner, M (Author) Other; Marinov, D (Author) Other; Guerra, V (Author) Other; Carlos Daniel Diogo Matias Pintassilgo (Author) FEUP; Welzel, S (Author) Other; Roepcke, J (Author) Other; Rousseau, A (Author) Other

Journal

Title: Contributions to Plasma Physics

Vol. 51 No. 2-3

Pages: 176-181

ISSN: 0863-1042

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 7 Citations

Scopus - 4 Citations

Other information

Authenticus ID: P-002-TJN

DOI: 10.1002/ctpp.201000068

Abstract (EN): 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 NO2 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 2.7x10(14) cm(-2). A simple kinetic model was developed and shows good agreement with the measured NO and NO2 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. (c) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6