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Acid gas removal experiments are carried out in a large bench scale corona radical shower reactor-catalyst hybrid system. A simulated stationary jet engine test cell flue gas is air mixed with NO, SO2 and CH4. NO, NO2 and SO2 concentrations were measured by a Green Line gas analyzer and the trace by-products are determined by Fourier Transform Infra-Red spectroscopy (FTIR). The aerosol particles generated by the acid gases and methane related plasma processes were collected by the electrostatic precipitator operated at !19 kV dc downstream of the reactor. The size of the reactor is (10×30×100 cm) and four pipe with nozzle type radical injectors are placed in series. The corona radical shower electrode used was a 6 mm o.d. tube equipped with 28 hollow electrodes (1.2 mm i.d./1.5 mm o.d.).