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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.137 SNIP: 0.341 CiteScore™: 0.43

ISSN Print: 1093-3611
ISSN Online: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v9.i4.40
pages 531-543

TOLUENE DESTRUCTION BY DBD AT ATMOSPHERIC PRESSURE IN A MULTI-POINT-TO-PLANE REACTOR. REACTION PATHWAYS BY ISOTOPIC LABELLING AND BY-PRODUCT DETERMINATION

L. Martin
Laboratoire de Génie des Procédés Plasmas et Traitement de Surfaces, 11 rue Pierre et Marie Curie, 75231 Paris Cedex France
S. Ognier
Laboratoire de Génie des Procédés Plasmas et Traitement de Surface, Ecole Nationale Supérieure de Chimie de Paris 11 rue Pierre et Marie Curie, 75005 Paris, France
F. Daou
Laboratoire de Génie des Procédés Plasmas et Traitement de Surfaces, 11 rue Pierre et Marie Curie, 75231 Paris Cedex France
Jacques Amouroux
Laboratoire de Genie des Precedes Plasmas Universite P. et M. Curie, ENSCP 11 rue P. et M. Curie 75005 Paris France

ABSTRACT

Depollution process by DBD reactor has been developed in air with toluene, a mono-aromatic molecule that simulates volatile aromatic pollutants (VOCs). The objective of the study is to understand the role of active oxygenate species produced by streamers in oxidation and polymerisation mechanisms of aromatic and polyaromatic compounds. A multi-point-to-plane plasma reactor is used. Discharge is produced by an AC 45 kHz HV generator and is electrically characterized by a 0.5 GHz numerical oscilloscope. An O2 (10%vol), H2O (1,8%vol), 700 or 300 ppmv toluene in N2 mixture is treated at atmospheric pressure and 100°C. A qualitative and quantitative chemical analysis of gas effluent and suspended particles is realized by Gas Chromatography coupled with a Mass Spectrometer in order to understand the pulsed discharge chemical reactivity. Alkanes, alkenes, oxidized molecules such as acetone and benzaldehyde, R-NOx (C2H5NO2, CH3ONO2) and heavy molecules such as octadecane-2-methyl, methylolpinene or anthracene have been identified. Labeled molecules, 18O2 and (C6H6)-CD3, are added in order to identify chemical pathways, especially toluene destruction. The active species coming from air oxygen lead to oxidation reactions with carbon chain cleavage whereas oxidants coming from H2O lead rather to addition reactions.


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