OH kinetics in photo-triggered discharges used for VOCs conversion

Abstract

The kinetic of the hydroxyl radical is studied in N 2 /O 2 /H 2 O mixtures with small amounts of acetone or isopropyl alcohol (0.5 %). The radical density is measured in absolute value in the afterglow of a photo-triggered discharge, which generates an homogeneous transient nonequilibrium plasma, using a time resolved absorption measurement method. For dry mixtures, experimental results are compared to predictions of a self-consistent 0D discharge and kinetic model. It is shown that dissociation of the VOCs through quenching collisions of nitrogen metastable states plays an important role in the production of OH. Measurements can not be explained looking only at the oxidation of acetone or IPA by the oxygen atom. This result is reinforced by experimental results about the OH density in wet mixtures, with or without VOCs, compared to dry ones. PACS:Plasma

Detailed Characterization of 2-Heptanone Conversion by Dielectric Barrier Discharge in N2 and N2/O2 Mixtures

“…Among the various methods of production of this radical, it was shown that the three-body recombination of O and H atoms is an efficient OH production process . For a phototriggered discharge (homogeneous plasma) in a mixture of dry air with 0.5% ethane, the maximum hydroxyl radical density in the afterglow was found to be equal to about 1% of the oxygen atom density produced during the current pulse. This important OH production is related to the production of H atoms following the dissociation of C 2 H 6 , and of its byproduct, through quenching processes of the nitrogen metastable states.…”

Propane dissociation in a non-thermal high-pressure nitrogen plasma

“…The photo-triggered reactor used in the present study, called "UV510", has been described in previous publications [21][22][23][24]. It allows to create an homogeneous plasma volume, V D , of 50 cm 3 , with a discharge current pulse of 60 ns for duration.…”

Catalyst screening for acetone removal in a single-stage plasma-catalysis system

“…To the best of our knowledge, far less has been done to investigate the effect of a range of supported metal oxide catalysts on the plasma-catalytic removal of low concentration acetone. The fundamental understanding of catalyst properties in the plasma-catalytic oxidation of acetone is still very limited [17,20]. It is of primary interest to screen a range of supported metal oxide catalysts to get new insights into the roles of different metal oxides and related structures in the plasma-catalytic removal of acetone and to establish a relationship between the process performance and catalyst properties.…”