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Abstract: The combination of nonthermal plasma with honeycomb catalysts still represents one of the major challenges in plasma catalysis from the technological point of view. The objective of this paper was to investigate a generation of stable discharge inside the channels of honeycomb catalyst (honeycomb discharge) with the assistance of micro-hollow surface dielectric barrier discharge generated by a perforated ceramic substrate. The surface discharge driven by AC high voltage served as a source of
nonthermal plasma and was coupled in series with DC high voltage applied across the honeycomb channels. The honeycomb catalyst was emulated by a bundle of glass capillary tubes that enabled optical emission spectroscopy of the discharge. We investigated the effect of applied AC and DC high voltages, air flow rate and relative humidity on stability and light emission intensity of the honeycomb discharge. We found that generation of honeycomb discharge is positively supported by an increase of air flow rate as well as air relative humidity. A chemical activity of the honeycomb discharge in terms of ozone O3 production was also briefly examined. The results showed that O3 concentration increased with an increase of amplitude of both AC and DC high voltages and was found higher for positive than for negative polarity of DC high voltage.
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