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Parametric analysis of plasma‐assisted pulsed dry methane reforming over Ni/Al 2 O 3 catalyst
Author(s) -
Kameshima Seigo,
Tamura Keishiro,
Mizukami Ryo,
Yamazaki Takumi,
Nozaki Tomohiro
Publication year - 2017
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.201600096
Subject(s) - dielectric barrier discharge , methane , catalysis , carbon dioxide reforming , plasma , analytical chemistry (journal) , chemistry , materials science , syngas , chemical engineering , environmental chemistry , organic chemistry , quantum mechanics , physics , engineering , electrode
Pulsed dry methane reforming (DMR) with CH 4 /CO 2 ratios of 0.5–2.0 was investigated in a dielectric barrier discharge (DBD) and Ni/Al 2 O 3 hybrid reaction. A pulsed CH 4 supply allows alternating DMR and de‐coking reactions, thus enabling reaction diagnostics without serious catalyst deactivation by coking. Parametric changes in the CH 4 /CO 2 ratio were used to probe the rate‐determining step and synergistic effect induced by DBD. Nonthermal plasma‐activated CO 2 and H 2 O were found to be key factors for enhancing the H 2 and CO yields and CO 2 conversion. In contrast, CH 4 conversion was not clearly enhanced by DBD at fixed temperatures near 550 °C. Moreover, based on experimental observations, a tentative mechanism was proposed wherein a trace amount of plasma‐excited H 2 O catalytically promoted solid carbon oxidation.