Speaker
P. Zikan
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/O5.301.pdf
Vibrational excitation kinetics of CO2 in a pulsed glow discharge studied
by FTIR and Raman spectroscopy
B.L.M. Klarenaar , A.S. Morillo-Candas , M. Grofulović , M.C.M. van de Sanden ,
1 3 4 1,2
O. Guaitella , R. Engeln
3 1
Eindhoven University of Technology, Eindhoven, The Netherlands
1
2
Dutch Institute for Fundamental Energy Research, Eindhoven, The Netherlands
3
Ecole Polytechnique, Univ. Paris Sud-11, UPMC, CNRS, Palaiseau, France
4
Instituto Superior Técnico, Universidade de Lisboa, Portugal
The intermittency property of renewable energy provides a great challenge when the
share of renewable energy sources increases. E.g. solar energy is only produced during the
day, while the electrical energy demand at night rarely drops below 50% of daytime
demand. Due to the intermittent nature of renewable energy sources production and demand
do not always coincide. To overcome this problem, renewable energy should be temporally
stored, e.g. by producing energy-dense hydrocarbon fuels, or solar fuels, from CO2. In this
process, efficient reduction of CO2 to CO is a key step. This dissociation step is believed to
be most efficient when selectively exciting the asymmetric-stretch vibration of CO2 [1].
We study the vibrational dynamics of CO2 by performing in situ Fourier Transform Infrared
(FTIR) spectroscopy [2], as well as rotational Raman spectroscopy [3] on a pulsed glow
discharge. For the analysis of the FTIR data we developed an algorithm to calculate and fit
the transmittance spectra for CO2 and CO mixtures. Some of the fit parameters are the
rotational temperature, Trot, the temperature of the fermi-resonant symmetric stretch mode
and bending mode of CO2, T1,2, and the temperature of the asymmetric mode, T3. The
algorithm uses the HITEMP-2010 database. Time and spatially-resolved rotational Raman
measurements are used to study the assumption made in the FTIR analysis, i.e. no
temperature variations along the line-of-sight. No significant changes of Trot along the
longitudinal axis of the reactor where found, while the values measured for different time
points during the plasma duty cycle correspond well to IR transmittance fits.
[1] V.D. Rusanov, A.A. Fridman, G.V. Sholin, Usp. Fiz. Nauk, 134, 6 (1981).
[2] B.L.M. Klarenaar, R. Engeln, D.C.M. van den Bekerom, M.C.M. van de Sanden, A.S.
Morillo-Candas, and O. Guaitella, Plasma Sources Sci. Technol., 26, 115008 (2017)
[3] B.L.M. Klarenaar, et al., (submitted to Plasma Sources Sci. Technol.)
