Electrochemical removal of NO from a gas stream containing 2% O-2, 5% H2O and 5% CO2 has been carried out between 400 and 800 degrees C using a single-compartment reactor, constructed from CeO2-based solid electrolyte with two palladium electrodes. At all temperatures studied, NO was decomposed to N-2 at the palladium cathode by applying a direct current to the reactor. The dependence of the conversion of NO to N-2 on the concentration of NO, O-2, H2O or CO2 was investigated at 450 degrees C in detail.