Oxygen removal from a hydrocarbon containing gas stream by plasma catalysis
- Hydrocarbon exhaust gases containing residual amounts of oxygen may pose challenges for their conversion into value added chemicals downstream, because oxygen may affect the process. This could be avoided by plasma treating the exhaust to convert \(O_{2}\) in presence of hydrocarbons into CO or \(CO_{2}\) on demand. The underlying reaction mechanisms of plasma conversion of \(O_{2}\) in the presence of hydrocarbons are analysed in a model experiment using a radio frequency atmospheric pressure helium plasma in a plug flow design with admixtures of \(O_{2}\) and of \(CH_{4}\). The plasma process is analysed with infrared absorption spectroscopy to monitor \(CH_{4}\) as well as the reaction products CO, \(CO_{2}\) and \(H_{2}O\). It is shown that the plasma reaction for oxygen (or methane removal) is triggered by the formation of oxygen atoms from \(O_{2}\) by electron. Oxygen atoms are efficiently converted into CO, \(CO_{2}\) and \(H_{2}O\) with CO being an intermediate in that reaction sequence. However, at very high oxygen admixtures to the gas stream, the conversion efficiency saturates because electron induced \(O_{2}\) dissociation in the plasma seems to be counterbalanced by a reduction of the efficiency of electron heating at high admixtures of \(O_{2}\). The impact of a typical industrial manganese oxide catalyst is evaluated for methane conversion. It is shown that the conversion efficiency is enhanced by 15–20% already at temperatures of 430 K.
Author: | Theresa UrbanietzGND, Christoph StewigGND, Marc BökeORCiDGND, Achim von KeudellORCiDGND |
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URN: | urn:nbn:de:hbz:294-96829 |
DOI: | https://doi.org/10.1007/s11090-020-10151-6 |
Parent Title (English): | Plasma chemistry and plasma processing |
Publisher: | Springer Science + Business Media B.V. |
Place of publication: | Dordrecht |
Document Type: | Article |
Language: | English |
Date of Publication (online): | 2023/02/23 |
Date of first Publication: | 2021/01/16 |
Publishing Institution: | Ruhr-Universität Bochum, Universitätsbibliothek |
Tag: | Chemical modeling; Hydrocarbon conversion; Methane oxidation; Plasma catalysis |
Volume: | 41 |
First Page: | 619 |
Last Page: | 642 |
Note: | Dieser Beitrag ist auf Grund des DEAL-Springer-Vertrages frei zugänglich. |
Institutes/Facilities: | Institut für Experimentalphysik II, Reaktive Plasmen |
Institut für Experimentalphysik II | |
Dewey Decimal Classification: | Naturwissenschaften und Mathematik / Physik |
open_access (DINI-Set): | open_access |
faculties: | Fakultät für Physik und Astronomie |
Licence (English): | Creative Commons - CC BY 4.0 - Attribution 4.0 International |