Title
Influence of vibrational states on <tex>$CO_{2}$</tex> splitting by dielectric barrier discharges Influence of vibrational states on <tex>$CO_{2}$</tex> splitting by dielectric barrier discharges
Author
Faculty/Department
Faculty of Sciences. Chemistry
Publication type
article
Publication
Washington, D.C. ,
Subject
Physics
Chemistry
Engineering sciences. Technology
Source (journal)
The journal of physical chemistry : C : nanomaterials and interfaces. - Washington, D.C., 2007, currens
Volume/pages
116(2012) :44 , p. 23257-23273
ISSN
1932-7447
1932-7455
ISI
000310769300012
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
In this paper, the splitting of CO2 in a pulsed plasma system, such as a dielectric barrier discharge (DBD), is evaluated from a chemical point of view by means of numerical modeling. For this purpose, a chemical reaction set of CO2 in an atmospheric pressure plasma is developed, including the vibrational states of CO2, O2, and CO. The simulated pulses are matched to the conditions of a filament (or microdischarge) and repeated with intervals of 1 μs. The influence of vibrationally excited CO2 as well as other neutral species, ions, and electrons on the CO2 splitting is discussed. Our calculations predict that the electrons have the largest contribution to the CO2 splitting at the conditions under study, by electron impact dissociation. The contribution of vibrationally excited CO2 levels in the splitting of CO2 is found be 6.4%, when only considering one microdischarge pulse and its afterglow, but it can be much higher for consecutive discharge pulses, as is typical for a filamentary DBD, when the interpulse time is short enough and accumulation effects in the vibrationally excited CO2 densities can occur.
E-info
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