Plasma-photocatalytic conversion of CO2 at low temperatures: Understanding the synergistic effect of plasma-catalysis



Mei, Danhua ORCID: 0000-0002-3024-3551, Zhu, Xinbo, Wu, Chunfei, Ashford, Bryony, Williams, Paul T and Tu, Xin ORCID: 0000-0002-6376-0897
(2016) Plasma-photocatalytic conversion of CO2 at low temperatures: Understanding the synergistic effect of plasma-catalysis. Applied Catalysis B: Environmental, 182. 525 - 532.

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Abstract

A coaxial dielectric barrier discharge (DBD) reactor has been developed for plasma-catalytic conversion of pure CO2 into CO and O2 at low temperatures (<150 °C) and atmospheric pressure. The effect of specific energy density (SED) on the performance of the plasma process has been investigated. In the absence of a catalyst in the plasma, the maximum conversion of CO2 reaches 21.7% at a SED of 80 kJ/L. The combination of plasma with BaTiO3 and TiO2 photocatalysts in the CO2 DBD slightly increases the gas temperature of the plasma by 6–11 °C compared to the CO2 discharge in the absence of a catalyst at a SED of 28 kJ/L. The synergistic effect from the combination of plasma with photocatalysts (BaTiO3 and TiO2) at low temperatures contributes to a significant enhancement of both CO2 conversion and energy efficiency by up to 250%. The UV intensity generated by the CO2 discharge is significantly lower than that emitted from UV lamps that are used to activate photocatalysts in conventional photocatalytic reactions, which suggests that the UV emissions generated by the CO2 DBD only play a very minor role in the activation of the BaTiO3 and TiO2 catalysts in the plasma-photocatalytic conversion of CO2. The synergy of plasma-catalysis for CO2 conversion can be mainly attributed to the physical effect induced by the presence of catalyst pellets in the discharge and the dominant photocatalytic surface reaction driven by the plasma. Graphical abstract

Item Type: Article
Uncontrolled Keywords: plasma-catalysis, dielectric barrier discharge, CO2 conversion, synergistic effect, energy efficiency
Depositing User: Symplectic Admin
Date Deposited: 27 Apr 2016 13:03
Last Modified: 15 Jan 2021 08:10
DOI: 10.1016/j.apcatb.2015.09.052
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3000944