Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 24, Issue 34, Pages 20553-20564Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2cp02119f
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Funding
- IDEX Paris Saclay (University Paris Saclay)
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This study used a non-filamentous discharge and a mass spectrometer to investigate the decomposition of acetone in N-2/O-2 gas mixtures. It was found that the presence of oxygen significantly decreased acetone degradation and resulted in a tremendous change in the distribution of by-products.
Understanding non-thermal plasma reactivity is a complicated task as many reactions take place due to a large energy spectrum. In this work, we used a well-defined photo-triggered non-filamentous discharge to study acetone decomposition in N-2/O-2 gas mixtures. The plasma reactor is associated to a compact chemical ionization FTICR mass spectrometer (BTrap) in order to identify and quantify in real-time acetone and by-products in the plasma. Presence of oxygen (1 to 5%) decreased notably acetone degradation. A tremendous change is observed in the by-products distribution concomitantly to a global decrease of their total concentration. While main products observed in oxygen-free gas mix are nitrile compounds, in oxygenated media they are replaced by formaldehyde, methanol and ketene. Methanol is maximum for 1% of O-2 whereas formaldehyde and ketene concentration reach their maximum value at the highest oxygen concentration tested (5%). A number of nitrate, nitrite and isocyanate organic compounds (C1 and C2) are observed as well with HNO2, HNO3 and HNCO.
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