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Methods for reduction of Volatile Organic Compounds (VOCs) content in airdepend on the 10 application considered. For low concentration and low flux,non-thermal plasma methods are often considered as efficient. However, thecomplex chemistry involved is still not well understood as there is a lack ofdatasets of byproducts formation. So as to overcome this issue, rapidanalytical methods are needed. We present the coupling of a rapid chemicalionization mass spectrometer (CIMS) for the real-time analysis of the VOCsformed during a degradation experiment. The high resolution instrument used 15allows for chemical ionization and direct quantification of non-targetedcompounds. We present degradation experiments of acetone in a photo-triggerednitrogen plasma discharge. Two regimes were highlighted: efficient conversionat low concentrations (<100ppm) and moderate efficiency conversion at higherconcentrations (>100ppm). Those two regimes were clearly delimited as the sumof two exponential curves occuring at respectively low and high concentrations.Many by-products were detected, in 20 particular HCN presented a significantlyhigh yield. Nitrile compounds (acetonitrile, propionitrile,...) are formed aswell. To a lower extent, ketene, acetaldehyde and formaldehyde are observed.The association of the high resolution mass spectrometer to the plasma reactorwill allow further insights into the plasma chemistry and comparison tomodelisation.

Direct and real-time analysis in a plasma reactor using a compact FTICR/MS: degradation of acetone in nitrogen and by-products formation