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 DW5: Green Plasma Science & Technology II |
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Chair: Pankaj Attri, Kyushu University Room: Sendai International Center Tachibana |
Wednesday, October 5, 2022 2:30PM - 3:00PM |
DW5.00001: Ns Pulse and Hybrid Discharges for Plasma Chemistry and Plasma Catalysis Applications Invited Speaker: Igor V Adamovich Electric field in a capacitively coupled, non-self-sustained “hybrid” RF discharge in nitrogen, with external ionization generated by high-voltage ns pulses, has been measured by ps Electric Field Induced Second Harmonic generation. The combined ns pulse / sub-breakdown RF waveform generates a diffuse plasma between two plane dielectric-covered electrodes. The measurements are made in the bulk of the plasma and in the sheaths. Reduced RF electric field in the sheaths is significantly higher compared to that in the plasma, exceeding 100 Td, due to the displacement of the electrons by the drift oscillations. However, kinetic modeling indicates that the electron impact ionization in the sheaths is largely ineffective, due to the low electron density. Peak reduced RF electric field in the plasma ranges from 10 to 40 Td, indicating the efficient vibrational excitation of N2 by electron impact. Hybrid ns pulse / RF plasmas can be used for the selective vibrational excitation of molecular species, such as N2, CO2, CO, and H2. In the present work, this approach is used to study the CO2 dissociation kinetics in CO2-N2, and the plasma-catalytic ammonia generation in N2-H2. Time-resolved vibrational populations of CO2 and CO, translational-rotational temperature, and CO number density are measured by mid-IR, tunable Quantum Cascade Laser Absorption Spectroscopy. Vibrational populations of N2 are measured by CARS. The NH3 number density is measured by FTIR absorption spectroscopy. The results identify the effect of the targeted vibrational excitation on the process yield. |
Wednesday, October 5, 2022 3:00PM - 3:30PM |
DW5.00002: Solar-Plasma Reactors and Processes for Sustainable Chemical Synthesis Invited Speaker: Juan P Trelles The synthesis of fuels and chemicals utilizing renewable energy via environmentally-benign methods is recognized as essential towards achieving sustainable development. Solar-plasma chemical synthesis seeks to combine the sustainability advantages and scalability of concentrated solar thermochemical techniques and the versatility, continuous operation, and high-efficiency of plasmachemical methods. Solar-plasma processes are characterized by their ratio of input solar power (Ps) to input electric power (Pe) as either Solar-Enhanced Plasmachemical (SEP, for Pe > Ps) or Plasma-Enhanced Solar thermochemical (PES, for Ps > Pe). This talk summarizes the rationale of solar-plasma chemical synthesis reactors and processes and presents two specific implementations for the conversion of carbon dioxide (CO2): solar-microwave plasma SEP and solar-gliding arc discharge PES. The rationale and evaluation of each approach is presented and contrasted. Particularly, solar-microwave plasma processes allow greater power densities circumventing the limitations of skin-depth power absorption, and solar-glidarc approaches present simpler operation and potential integration with solar thermochemical methods. Strategies for the advancement of solar-plasma methods for sustainable chemical synthesis are discussed. |
Wednesday, October 5, 2022 3:30PM - 4:00PM |
DW5.00003: Gas Phase and Surface Infrared Studies of Plasma-catalysis Invited Speaker: Gottlieb Oehrlein Low-temperature plasma produces reactive species that can lead to new reaction pathways on a catalyst surface and lead to product enhancements. We will review two such examples: One, plasma-catalytic decomposition of CH4 by O2 over a Ni-SiO2/Al2O3 catalyst and two, plasma-enhanced N2 oxidation over a Pt-Al2O3 catalyst. For both, an atmospheric pressure plasma jet (APPJ) fed with the gasses of interest was interacted with the catalyst located 5 mm from the APPJ at variable catalyst temperatures. Fourier-transform infrared spectroscopy was used for measurement of downstream species, and diffuse reflectance infrared Fourier transform spectroscopy for analysis of surface species. |
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