Abstract
AbstractIn order to evaluate the potential of the combination of non-thermal plasma (NTP) and in situ heterogeous catalysis (plasma catalysis) for the improvement of efficiency and selectivity towards total oxidation of organic pollutants, the impact of plasma processes inside the inner pore volume of porous materials was investigated by means of catalytic reactions and spectroscopy. Besides studying the conversion of organic model substances, electron paramagnetic resonance (EPR) spectroscopy was applied to detect both the formation of radical species by the NTP and the initiation of structural changes to the catalyst. The presence of short-lived oxidizing species and plasma effects in the inner pore volume of porous catalysts (alumina in this case) could be clearly shown by detecting a significant influence on the oxidation process and the formation of a paramagnetic site which can be correlated to an aluminum peroxide radical: Al-O-O. The relatively stable paramagnetic center (lifetime > 14 days) was formed by the NTP independently of the gas atmosphere, namely its oxygen content. The signal was not significantly affected by the application of reducing agents to the sample.
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