Speaker
Vladislav Kotov
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P4.3010.pdf
Self-consistent 1D modelling of the CO2 conversion in microwave
discharges
Vladislav Kotov
Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik,
Partner of the Trilateral Euregio Cluster (TEC), 52425 Jüich, Germany
Splitting of the atmospheric CO2 into CO and O2 together with water electrolysis are the
basic processes required to transfer the intermittent electricity produced by the wind and solar
power plants into storable chemical fuels. An up to 80 % energy efficiency of the CO2 splitting
in microwave (2.4 GHz) induced plasmas was reported back in 1970s-1980s [1, 2]. To facilitate
the theoretical understanding and, thus, optimization of the process, recently a very detailed
model of the CO2 plasma chemistry has been compiled [3, 4, 5]. The model explicitly describes
72 heavy species, including vibrationally excited states, and takes into account more than 5000
reactions. With this reaction set, however, the maximum calculated efficiency of only around
30 % was obtained [4]. This result seem to contradict not only with the experimental values, but
also with theoretical calculations reported in the past.
In the present paper the energy efficiency of the process is investigated on the basis of a simple
1D model of the plasma flow. The electron density and temperature (average energy), as well as
the translational-rotational temperature of heavy particles are calculated self-consistently. For
the chemical kinetics the reaction set published in [5] is revised and implemented by translating
it into Fotran code. Analysis in the relevant range of discharge parameters will be presented.
Conditions of achieving the highest reported efficiency in the model will be discussed.
References
[1] V. D. Rusanov, A. A. Fridman, G. V. Sholin Sov. Phys. Usp. 24 447 (1981).
[2] A. Fridman Plasma Chemistry, Cambridge: Cambridge University Press, 2008
[3] T. Kozak, A. Bogaerts Plasma Sources Sci. Technol 23 045004 (2014).
[4] T. Kozak, A. Bogaerts Plasma Sources Sci. Technol 24 015024 (2015).
[5] P. Koelman et al. Plasma Proceses and Polymers 14 1600155 (2017),
https://plasimo.phys.tue.nl/resources/
