Removal of NOx by pulsed intense electron beam irradiation

Fundamental research on removal of NOx from the mixture gas by irradiation using the pulsed intense electron beam, which have energy of ⩽160 keV, beam current of 140 A, current density of 2 A/cm² , pulse width of 700 ns and electron beam power of 12.6±0.4 J/pulse at standard conditions, was performed. When NO(=200 ppm)/N₂ was processed, NO was decomposed to N₂ and O₂ with the efficiency for the beam power of 220-300 nmol/J. Oxidization of NO to NO₂ was accelerated by the beam irradiation in the gas mixture of NO(=160 ppm)/O₂(20%)/N₂(80%). By introducing equal amount of NH₃ or CH₄ to NO into this gas mixture, NOx decreased at 8th shot of beam irradiation when NO was completely converted to NO₂. NOx removal from NO(=200 ppm)/N₂ gas in various gas cell and NO(=2000 ppm)/N₂ gas were investigated. The removal ratio in single shot was largest(30%) at the high current electron beam transported and compressed by external magnetic field but the removal efficiency was largest (650-860 nmol/J) at large volume gas cell without magnetic field. The efficiency increased to 1100 nmol/J for high NO concentration gas treatment