| CPC B01D 53/32 (2013.01) [B01D 53/261 (2013.01); B01D 53/92 (2013.01); F01N 3/01 (2013.01); F01N 3/037 (2013.01); F01N 3/0892 (2013.01); B01D 2257/404 (2013.01); B01D 2257/502 (2013.01); B01D 2257/702 (2013.01); F01N 2240/22 (2013.01); F01N 2240/28 (2013.01); F01N 2240/30 (2013.01)] | 32 Claims |

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[ 28. A method of treating a gas stream, the method comprising:
directing the gas stream into a first reaction zone;
energizing the gas stream to generate a first plasma comprising a dielectric barrier discharge (DBD) plasma between a first inner electrode nested within a second electrode in the first reaction zone;
further energizing, within a second reaction zone, the gas stream energized in the first reaction zone to generate a second plasma comprising one of a rotating glide-arc plasma or a microwave plasma,
wherein the first and second reaction zones are disposed serially such that the first inner electrode is directly coupled to a common reaction zone common to the first and second reaction zones and configured to sustain therein the first plasma. ]
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