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The objective of this work was to explain the efficient NOx removal from simulated flue gas observed in the hybrid corona discharge-catalyst hybrid systems with either V 2 O 5 /TiO 2  catalyst or zeolite, both at room temperature. The simulated flue gas was a mixture of N 2  (80%):O 2  (5%):CO 2  (15%):NO (200 ppm). After analysing the results of several experiments on NOx removal in the corona discharge-catalyst (or zeolite) systems, two different mechanisms of NOx conversion in the hybrid systems are proposed. In the positive corona discharge-catalyst system, NOx molecules are removed due to the activation of the catalyst surface by the corona discharge (TiO 2  + ε (≥ 3.2 eV) → hole +  + e), which is followed by: (a) the catalyst surface driven formation of NH 2  radicals (which reduce NOx into N 2  in gas phase) and H +  (or NH 4   + ) ions, (b) the oxidation of NOx to surface-trapped NO 3  - . The NO 3  -  ions trapped on the catalyst surface are precursors of the formation of NH 4 NO 3  aerosols depositing on the catalyst surface. In the corona discharge-zeolite system, the conversion of NOx into NH 4 NO 3 , N 2  and H 2 O occurs due to the reactions involving zeolite-fixed NH 4  +  ions.

The Role of Surface Reactions in De-NOx Processes in Corona Discharge-Catalyst (or Zeolite) Hybrid Systems