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Synergistic CO 2 conversion by hybridization of dielectric barrier discharge and solid oxide electrolyser cell
Author(s) -
Mori Shinsuke,
Tun Lin Lin
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.201600153
Subject(s) - dissociation (chemistry) , dielectric barrier discharge , decomposition , oxide , oxygen , chemistry , plasma , reaction rate , chemical engineering , saturation (graph theory) , materials science , analytical chemistry (journal) , catalysis , chromatography , electrode , organic chemistry , physics , mathematics , quantum mechanics , combinatorics , engineering
Hybrid reactor of Dielectric Barrier Discharge (DBD) and Solid Oxide Electrolyser Cell (SOEC) was fabricated and CO 2 decomposition characteristics were investigated. For the case of the DBD reactor alone, the CO 2 conversion saturates with residence time. In contrast, the saturation is not observed for the case of the hybrid system where CO 2 conversion increases monotonically with increasing residence time. This is because the reverse reaction to regenerate the CO 2 in plasma is suppressed by the oxygen removal by SOEC in hybrid system and consequently CO 2 decomposition reaction proceeds irreversibly. We have examined the experimental results by analytical modeling and reaction mechanism for the CO 2 decomposition in the hybrid reactor of DBD and SOEC is deduced. The time‐dependent CO 2 conversion for the only plasma reactor and hybrid reactor can be reproduced by a reversible and irreversible first‐order reaction model, respectively. The analytical model can also reproduce the dependence of CO 2 conversion on the plasma input power very well. Interestingly, not only the reverse reaction rate but also the forward dissociation reaction rate is reduced by the SOEC in the case of hybrid reactor. The analytical modeling suggests that CO 2 decomposition in the conventional DBD plasma reactor proceeds not merely by direct electron impact dissociation but also by reaction with reactive oxygen.