Bulletin of the American Physical Society
75th Annual Gaseous Electronics Conference
Volume 67, Number 9
Monday–Friday, October 3–7, 2022;
Sendai International Center, Sendai, Japan
The session times in this program are intended for Japan Standard Time zone in Tokyo, Japan (GMT+9)
Session DW1: Green Plasma Science & Technology I |
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Chair: Gerard Van Rooij, Maastricht University Room: Sendai International Center Tachibana |
Wednesday, October 5, 2022 8:00AM - 8:30AM |
DW1.00001: Nitrogen vibrational excitation in a non-self-sustained discharge plasma toward efficient nitrogen fixation processes Invited Speaker: Keisuke Takashima Inorganic nitrogen fertilizers, such as nitric acid, can be selectively generated with air and water by discharge plasmas, thus potentially become a sustainable method for the nitrogen-fixation with renewable energy resources. Some of suggested reaction pathways in the plasma nitrogen-fixation include vibrationally excited nitrogen molecules as a key reactant, whose efficient generation is important to improve the net efficiency. In a past few years, toward efficient and controlled nitrogen dissociation processes, we have studied on the discharge plasma source for efficient generation of vibrationally exited nitrogen molecule. This work focuses on building a concrete basis to study chemical reactivity of vibrationally excited nitrogen, in a way adoptable to variable energy input with measurements on the vibrational population and the rotational temperature of nitrogen at the ground electronic state. Control of reduced electric field E/N below the self-sustaining discharge voltage is realized by a developed discharge plasma source powered by both a lab-built nanosecond pulse generator and a DC power supply to superimpose the non-self-sustaining voltage for vibrational excitation. Apparent E/N higher than 5 has been achieved up to 0.2 atm with our discharge geometry and the pulse width modulation technique . The superimposed DC voltage is found to populate higher vibrational level more than v = 8 estimated by spontaneous Raman spectroscopy while the gas heating effects were found below the detection limit of the rotational and vibrational Raman spectra fitting. Fluid dynamical and vibrational relaxation modeling in the pulse intervals supports our arguments that the superimposed DC plays a key role in efficient generation of vibrationally excited nitrogen. Further details on the discharge characteristics and measurements on the Raman spectroscopy will be presented. |
Wednesday, October 5, 2022 8:30AM - 8:45AM |
DW1.00002: Selective Energy Input into Vibrational Energy of Nitrogen Molecule in Non-Self-Sustaining DC Discharge Plasma Source Yuki Kunishima, Keisuke Takashima, Toshiro Kaneko A Non-Self-Sustaining DC (NSS DC) discharge plasma source aiming for efficient nitrogen vibrational excitation by apparent reduced electric field (E/N) control has been developed. This plasma source utilizes a nanosecond pulse plasma generator and a DC power supply. The superimposed DC voltage controls the apparent E/N suitable for efficient nitrogen vibrational excitation. The ro-vibrational Raman spectrum of the ground state nitrogen molecule is experimentally measured to estimate the vibrational distribution function and the rotational temperature. The vibrational excitation is enhanced with the increase of the apparent E/N, and vibrational level more than v=8 is experimentally observed in the discharge volume. A vibrational relaxation model has been constructed to investigate the relation between vibrational distribution and the energy input with superimposed DC voltage. The model includes vibrational-to-vibrational energy transfer and vibrational-to-translational energy transfer of the nitrogen molecule. The model highlights the importance of energy input with E/N control to efficiently increase the density of vibrationally excited nitrogen molecules. Further details will be discussed at the meeting. |
Wednesday, October 5, 2022 8:45AM - 9:00AM |
DW1.00003: The energy cost of N2 dissociation in a microwave discharge: combining modeling and experiments Margherita Altin, Pedro Viegas, Luca Vialetto, Alex W van de Steeg, Savino Longo, Gerard J Van Rooij, Paola Diomede The production of N radicals in microwave (MW) plasma discharges is investigated through experiments and modeling. Particular attention is given to vibrational excitation as a means to reduce the energy cost of dissociation of N2 molecules as a first step for optimization of nitrogen fixation in plasmas. |
Wednesday, October 5, 2022 9:00AM - 9:30AM |
DW1.00004: Plasma assisted green ammonia production from water and nitrogen at atmospheric pressure Invited Speaker: Muzammil Iqbal Increasing fossil-free global energy demands have motivated the scientific community to investigate new clean and sustainable techniques that can meet global energy demands. The production of green and sustainable fuel, such as ammonia (NH3), from base molecules like water and nitrogen using electricity from renewable sources shows great potential to solve energy issues. Non-thermal plasma-based NH3 synthesis has great potential for carbon-free fertilizer production powered by renewable electricity. We developed a non-thermal plasma couple with a catalyst for a higher ammonia production rate. The studied plasma technique offers ~0.84 % NH3 concentration with ~95 % selectivity and a 120 µmol/s production rate by integrating a catalytic reduction system with plasma. Compared with previous studies on NH3 synthesis from N2, the remarkable NH3 yield (300–400-fold higher). These promising results provide a breakthrough in the transition toward sustainable and environmentally friendly NH3 production. |
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