Download presentation
Presentation is loading. Please wait.
Published byMarilynn Sherman Modified over 9 years ago
1
Reforming and Fixation of Carbon Oxides in Atmospheric Pressure Non- thermal CO/CO 2 Plasmas Robert Geiger Advisor: Dr. David Staack Texas A&M Mechanical Engineering Plasma Engineering & Diagnostics Laboratory (PEDL)
2
Outline Introduction Experimental Setup Results Future Work Conclusion
3
Carbon Monoxide at Really High Pressures Lipp M J et al 2005 Nat. Mater. 4 211 V V Brazhkin 2006 J. Phys.: Condens. Matter 18 9643
4
EXPERIMENTAL SECTION
5
Experimental Setup Power Supply: V max ~ 10 kV I max ~ 40 mA Freq ~ 25 – 30 kHz P ~ 40W-150W
6
Low Power Setting (~60W) Color Changes with Time and Power 30 min60 min 120min180min Hi Power Setting (~130W, 180 min) Low Power Setting (~60W, 180 min)
7
FTIR – Comparison with High Pressure Film (High Pressure Film FTIR data taken from: Lipp M J et al 2005 Nat. Mater. 4 211)
8
Film Properties C:O ~ 1.5 - 3.5 (XPS) Solubility Water (Hydrates) Insoluble Acetone Ethanol Solubility allows for spin coating and layer by layer film growth Before After Hydration C:O ~ 1.9 1.7
9
Kinetics Proposed mechanism from several sources McTaggart FK PIasma Chemistry in Electrical Discharges (1967)
10
Kinetic Model in Development Still need to add CO* reactions C(s) reactions Surface reactions
11
Kinetic Model in Development
12
CO CO2 C3O2 C3O2(p) Const T Te = 1 eV ne = 10 13 cm -3 ne = const
13
Emission Spectroscopy Angstrom CO Bands (B 1 Σ + – A 1 π) C2 Swan Bands (d 3 π– a 3 π) Herzberg CO Bands (C 1 Σ + – A 1 π)
14
Emission Spectroscopy - Temperature
15
Future Work Characterize polymers and determine their properties Complete the kinetic model and compare with experimental Determine optimum production parameters
16
Conclusion Interesting films can be formed with solely carbon and oxygen atoms These films appear similar in structure to high pressure CO polymers A kinetic model in under development The C2 swan, CO angstrom and CO Herzberg bands enables temperature measurements in the visible range
17
References Lipp M J et al 2005 Nat. Mater. 4 211 V V Brazhkin 2006 J. Phys.: Condens. Matter 18 9643 McTaggart FK PIasma Chemistry in Electrical Discharges (1967) P.C.Cosby, J. Chem. Phys. 98,9560(1993). K.M.D’Amico,and A.L.S.Smith, J.Phys.D: Appl. Phys. 10,261 (1977) Questions?
18
Solubility and Hydration BeforeAfter
19
CO CO 2 + C (gr) Metastability of CO
21
C/O ratios ranging from 1.5-3.5 XPS Ref: INSERT REF
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.