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Gaseous by-products and deposited material obtained from the decomposition of benzene, toluene and xylene in an atmospheric pressure DC corona discharge were minutely investigated by gas chromatograph mass spectrometry and infrared absorption spectroscopy, and the decomposition processes of benzene, toluene and xylene were estimated. It was found that carbon dioxide (CO 2 ), carbon monoxide (CO), formic acid (HCOOH) and formic anhydride ((CHO) 2 ) were the major gaseous by-products from benzene, toluene and xylene, while acetic formic anhydride (CH 3 COOCHO) and acetic acid (CH 3 COOH) were the major by-products from toluene and xylene. Benzaldehyde (C 6 H 5 CHO) and methyl benzaldehyde (CH 3 CH 4 CHO) were produced from toluene and xylene, respectively. It was hypothesized that the decomposition of benzene, toluene, and xylene was initiated by the production of phenyl radicals, phenyl and benzyl radicals, and methyl benzyl and methyl phenyl radicals, respectively. These radicals are deposited on electrodes, wall, etc., resulting in the polymerization of aromatic rings and the substitution of function groups. Also, those radicals are decomposed and converted into by-products described above. In addition, it is probably that benzyl and methyl benzyl radicals are precursors of C 6 H 5 CHO and CH 3 C 6 H 4 CHO, respectively, and that C 6 H 5 CHO and CH 3 C 6 H 4 CHO are decomposed, contributing to by-product production and deposition. Furthermore, some intermediate by-products, produced by the cleavage of the aromatic ring in benzene, toluene and xylene decomposition and containing O=C-O, C=O, O-H, and C-H groups, may be deposit on the electrodes.

journal of advanced oxidation technologies

Decomposition Characteristics of Benzene, Toluene and Xylene in an Atmospheric Pressure DC Corona Discharge II. Characteristics of Deposited By-products and Decomposition Process