Journal
WASTE DISPOSAL & SUSTAINABLE ENERGY
Volume 2, Issue 2, Pages 139-150Publisher
SPRINGERNATURE
DOI: 10.1007/s42768-020-00034-z
Keywords
CO2 activation; Plasma catalysis; TiO2; Synergistic effect
Funding
- National Natural Science Foundation of China [51706204]
- National Key Technologies RD Program [YS2018YFE010498]
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [823745]
- State Key Laboratory of Electrical Insulation and Power Equipment at Xi'an Jiaotong University [EIPE19207]
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For the first time, this paper demonstrates a synergistic effect from the combination of a gliding arc discharge plasma with a photocatalyst TiO2 for CO2 dissociation. The effects of adding a tray downstream the discharge and the combination of the catalyst with plasma have been investigated. Two different combination modes of plasma catalysis, i.e., in-plasma catalysis and post-plasma catalysis, have been evaluated with the emphasis on the analysis of potential mechanisms. The results show that modifying the gliding arc reactor by the addition of a tray can enhance the fraction of gas treated by plasma, thus improving the reaction performance. An exceptional synergistic effect of combining the gliding arc discharge with TiO2 for CO2 activation forms in the in-plasma catalysis mode. The presence of TiO2 significantly enhances the CO2 conversion by 138% and the energy efficiency by 133% at a flow rate of 2 L/min. The plasma activation effect, which produces energetic electrons that can create the electron-hole pairs on the catalyst surface, is believed to be the major contributor to the generation of the plasma catalysis synergy. This mechanism has been further evidenced by the negligible influence of the post-plasma catalysis on the reaction performance.
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