NOx removal enhancement by a jerks-and-jumps type electrode in a dielectric barrier discharge

Mercado-Cabrera, Antonio; León del Villar, Eliseo; Valencia-Alvarado, Raul; López-Callejas, Regulo; Barocio, Samuel R.; Peña-Eguiluz, Rosendo; Muñoz-Castro, Arturo; De la Piedad-Beneitez, Anibal Mexico

Dielectric barrier discharge cells with plane electrodes are some of the most broadly utilized devices for the generation of cold plasma at atmospheric pressure intended for NOx removal.
In this study, one of the plane electrodes of a reactor has been modified in order to reduce its electric potential level and, at the same time, to increase its removal capacity by generating a cold plasma using a non-homogenous electric field on the electrode surface. This field has been achieved by means of a jerks and jumps-like electrode profile. The other electrode conserves the original flat form. The experiments on the removal of NOx and SO2 were carried out in this 22.4 cm3 reactor. Concentrations of 30-80 ppm of NOx and SO2 in nitrogen were used with 1 SLPM flows. The power transferred to the reactor was determined from its Lissajous figures. The exhaust gases were analysed as well as characterised by gas chromatography and mass spectrometry. Additional tests were also carried out in a second reactor of the same reaction volume but where two flat and parallel electrodes were used, in order to compare the results.
According to preliminary results, the jerks and jumps reactor has made possible to generate dielectric barrier discharges using lower electric potentials. Under the same power supply conditions, the power transference in the modified reactor was increased. It is possible to attribute this fact to the observed peak effect on the electrode surface.. The NO removal efficiency in the two flat electrode case approached 95% for while ~98% in the jerks and jumps reactor

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