Electron-induced dry reforming of methane in a temperature-controlled dielectric barrier discharge reactor

Type
Article

Authors
Zhang, Xuming
Cha, Min Suk

KAUST Department
Clean Combustion Research Center
Mechanical Engineering Program
Physical Science and Engineering (PSE) Division

Online Publication Date
2013-09-23

Print Publication Date
2013-10-16

Date
2013-09-23

Abstract
Dry reforming of methane has the potential to reduce the greenhouse gases methane and carbon dioxide and to generate hydrogen-rich syngas. In reforming methane, plasma-assisted reforming processes may have advantages over catalytic processes because they are free from coking and their response time for mobile applications is quick. Although plasma-assisted reforming techniques have seen recent developments, systematic studies that clarify the roles that electron-induced chemistry and thermo-chemistry play are needed for a full understanding of the mechanisms of plasma-assisted reformation. Here, we developed a temperature-controlled coaxial dielectric barrier discharge (DBD) apparatus to investigate the relative importance of electron-induced chemistry and thermo-chemistry in dry reforming of methane. In the tested background temperature range 297-773 K, electron-induced chemistry, as characterized by the physical properties of micro-discharges, was found to govern the conversions of CH4 and CO2, while thermo-chemistry influenced the product selectivities because they were found to depend on the background temperature. Comparisons with results from arc-jet reformation indicated that thermo-chemistry is an efficient conversion method. Our findings may improve designs of plasma-assisted reformers by using relatively hotter plasma sources. However, detailed chemical kinetic studies are needed. © 2013 IOP Publishing Ltd.

Citation
Zhang, X., & Cha, M. S. (2013). Electron-induced dry reforming of methane in a temperature-controlled dielectric barrier discharge reactor. Journal of Physics D: Applied Physics, 46(41), 415205. doi:10.1088/0022-3727/46/41/415205

Acknowledgements
This work was supported by KAUST.

Publisher
IOP Publishing

Journal
Journal of Physics D: Applied Physics

DOI
10.1088/0022-3727/46/41/415205

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