The decomposition of acetaldehyde, for a molecule concentration equal to 500 ppm, is studied in N_2/CH_3CHO mixtures at atmospheric pressure and ambient temperature, energised by a dielectric barrier discharge producing non-homogeneous filamentary plasma. The removal of CH_3CHO is followed by gas chromatography techniques and FTIR spectroscopy. By-products are fully characterized as function of the specific deposited energy. It is shown that CH_3CHO is efficiently decomposed through either electronic collisions or quenching of the nitrogen metastable states. This decomposition leads to various compounds. Main ones are hydrogen, methane, and carbon monoxide, highlighting the break of the C-C bond to produce methyl and formyl radicals. Other minor products are HCN and various nitriles, ethane, isocyanic acid, and acetone.
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