The role of the number of filaments in the dissociation of CO2 in dielectric barrier discharges

Autor: C Douat, S Ponduri, T Boumans, O Guaitella, S Welzel, E Carbone, R Engeln
Přispěvatelé: EIRES Chem. for Sustainable Energy Systems, Plasma & Materials Processing, Groupe de recherches sur l'énergétique des milieux ionisés (GREMI), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Eindhoven University of Technology [Eindhoven] (TU/e), Laboratoire de Physique des Plasmas (LPP), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École polytechnique (X)-Sorbonne Université (SU)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Dutch Institute for Fundamental Energy Research [Eindhoven] (DIFFER), Institut National de la Recherche Scientifique [Québec] (INRS), ASML [VELDHOVEN] (ASML), ASML Netherlands B.V., European Project: 606889,EC:FP7:PEOPLE,FP7-PEOPLE-2013-ITN,RAPID(2013)
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Plasma Sources Science and Technology, 32(5):055001. Institute of Physics
Plasma Sources Science and Technology
Plasma Sources Science and Technology, 2023, ⟨10.1088/1361-6595/acceca⟩
Plasma Sources Science and Technology, 32, 055001
ISSN: 0963-0252
1361-6595
Popis: An experimental investigation of the dissociation of CO2 in a symmetric pin-to-pin dielectric barrier discharge (DBD) is presented. The reactor geometry allows for an accurate control of the number of filaments (microdischarges) and is used to study the impact of one single filament on the CO2 dissociation. We show the number of filaments per half cycle follows a power-law as a function of the injected power and does not depend on pressure, flow or other process parameters. It is shown that for pressures between 200 and 700 mbar approximately 0.5 W per filament is required and the charge transferred per filament remains constant at 0.5 nC. Furthermore, the dependence of CO2 conversion on only specific energy input (SEI) is shown to be valid down to a single filament. Additionally, by using quantum cascade laser absorption spectroscopy the absolute number of CO molecules produced per filament is measured and is found to be in the range from 5.1011 to 2.1012. The conversion degree of CO2 into CO is estimated to be lower than 0.1% within a single filament and increases with SEI. In the presence of a couple of filaments, the maximum energy efficiency obtained is 25%. A comparison of the conversion degrees in pin-to-pin DBD and plane-to-plane DBD configuration shows that these two reactor geometries follow the same power law. This means the geometry is not the most important parameter in CO2 dissociation in DBDs, but the SEI and thus the number of filaments ignited per unit of time. This result means that the dependence of conversion degree on the SEI can be extended to a single filament. This observation leads to the conclusion that the SEI appears to be valid as a universal scaling parameter down to very low values.
Databáze: OpenAIRE
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