Abstract
The kinetics of destruction of C2H2 is investigated in a low pressure pulsed dc discharge in dry air. Tuneable diode laser absorption spectroscopy in the mid-infrared region (1350 cm−1) has been used to measure the influence of (i) the pulse duration, (ii) the pulse repetition rate and (iii) the pulse current on the C2H2 concentration in situ the discharge tube. First, it is shown that in the plasma region under flow conditions the time averaged concentration of C2H2 depends only on the time averaged discharge current. Second, time resolved measurements have been performed in a closed reactor, i.e. under static conditions. A simple kinetic modelling of the pulsed discharge leads to a good agreement with the experimental results and shows that the oxidation rate of C2H2 is mainly controlled by the time averaged concentration of O atoms. Finally, the influence of porous TiO2 photocatalyst on the C2H2 oxidation rate is reported.
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