Title
DBD in burst mode : solution for more efficient <tex>$CO_{2}$</tex> conversion? DBD in burst mode : solution for more efficient <tex>$CO_{2}$</tex> conversion?
Author
Faculty/Department
Faculty of Sciences. Chemistry
Publication type
article
Publication
Bristol :Institute of Physics ,
Subject
Chemistry
Source (journal)
Plasma sources science and technology / Institute of Physics. - Bristol, 1992, currens
Volume/pages
25(2016) :5 , p. 1-9
ISSN
0963-0252
Article Reference
055005
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
CO2 conversion into value-added products has gained significant interest over the few last years, as the greenhouse gas concentrations constantly increase due to anthropogenic activities. Here we report on experiments for CO2 conversion by means of a cold atmospheric plasma using a cylindrical flowing dielectric barrier discharge (DBD) reactor. A detailed comparison of this DBD ignited in a so-called burst mode (i.e. where an AC voltage is applied during a limited amount of time) and pure AC mode is carried out to evaluate their effect on the conversion of CO2 as well as on the energy efficiency. Decreasing the duty cycle in the burst mode from 100% (i.e. corresponding to pure AC mode) to 40% leads to a rise in the conversion from 1626% and to a rise in the energy efficiency from 15 to 23%. Based on a detailed electrical analysis, we show that the conversion correlates with the features of the microfilaments. Moreover, the root-mean-square voltage in the burst mode remains constant as a function of the process time for the duty cycles  <70%, while a higher duty cycle or the usual pure AC mode leads to a clear voltage decay by more than 500 V, over approximately 90 s, before reaching a steady state regime. The higher plasma voltage in the burst mode yields a higher electric field. This causes the increasing the electron energy, and therefore their involvement in the CO2 dissociation process, which is an additional explanation for the higher CO2 conversion and energy efficiency in the burst mode.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/9661b4/134841.pdf
E-info
https://repository.uantwerpen.be/docman/iruaauth/f7909c/134841.pdf
Handle