EFFECT OF CaO ON NH3 + NO + O2 REACTION SYSTEM AT 650-900 °C

摘要

Effect of CaO on NH3 + NO + O2 reaction system was investigated at 650 – 900 °C. Experimental results showed that CaO had a strong catalytic effect on NH3 decomposition, NH3 oxidization by O2 to form NO, and NO + NH3 reaction for NO reduction by NH3 to N2 in the absence of O2. In the presence of O2, the overall effect of CaO on NO + NH3 + O2 reaction system at 650 – 900 °C was to enhance the oxidization of NH3 by O2 to produce more NO. Small amount of NO2 and no N2O was detected in the outlet gas stream over CaO bed in NH3 + NO + O2 reaction. NO2 formation decreased with temperature increase at 650 – 900 °C. The formation of NO2 over CaO bed in NH3 + NO + O2 reaction system was attributed to the oxidization of NH3 and NO by O2.