Radiation treatment of exhaust gases, (13)

The NH3 consumption by electron beam irradiation has been studied in the moist NO-SO2-O2-N2 mixtures containing NH3. The [NH3] decreased linearly with increasing dose at various NH3 initial concentrations. The G(-NH3) increased with NH3 concentration up to about 500 ppm and was held almost constant (G(-NH3) = 5.8 at 750 ppm NH3) above it. The rate of the NH3 consumption was about 175 ppm/Mrad above 500 ppm NH3. The G(-NH3) increased with H2O and SO2 concentrations. On the contrary, the G(-NH3) decreased with increasing NO concentration and was hardly affected by the presence of 3 -- 19.5% O2. The g(-NH3) became larger with decreasing temperature in the range of 80 -- 1500C. An apparent activation energy of the NH3 consumption was -3.82 kcal/mol. The NH3 is mainly consumed by the reactions of NH3 with HNO3 and H2SO4, leading to the formations of NH4NO3 and (NH4)2SO4 respectively. (author)