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
2:30 PM–4:00 PM,
Wednesday, October 5, 2022
Sendai International Center
Room: Tachibana
Chair: Pankaj Attri, Kyushu University
Abstract: DW5.00003 : Gas Phase and Surface Infrared Studies of Plasma-catalysis*
3:30 PM–4:00 PM
Presenter:
Gottlieb Oehrlein
(University of Maryland, College Park)
Authors:
Gottlieb Oehrlein
(University of Maryland, College Park)
Michael Hinshelwood
(University of Maryland)
Yudong Li
(University of Maryland)
For the CH4/O2 system we find that O atoms are key for CH4 oxidation when only Ar/O2 passes through the plasma at near 25°C. Thermal oxidation of CH4 becomes important as the catalyst is heated up to 500°C. On the other hand, CH4 oxidation to CO and CO2 is greatly enhanced if Ar/CH4/O2 plasma is used. In this case, the catalyst can be activated by large power plasma at 500°C and continues to produce CO after the APPJ is extinguished and not seen prior to plasma application.
For the N2/O2 system, N2 oxidation occurs within the APPJ and shows a dependance on ambient temperature for the NO to NO2 reaction, with NO becoming dominant at 350°C. In the presence of a Pt catalyst at 350°C, Pt promotes further oxidation and NO2 becomes dominant. At temperatures below 270°, plasma produced nitrogen-oxygen species are stored on the catalyst surface, including nitrites and nitrates, and released at high temperatures. The reasons for these observations will be discussed, along with correlations of gas phase and surface IR data aimed at gaining more insights into the plasma catalysis reactions.
*We gratefully acknowledge the financial support by National Science Foundation (CBET-1703211) and US Department of Energy (DE-SC0020232).
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