Electrochemical removal of NO and CH4 in the presence of excess O-2, H2O and CO2 using Sm2O3-doped CeO2 as a solid electrolyte

Electrochemical removal of NO and CH4 from a gas stream containing excess O-2, H2O and CO2 has been carried out between 400 and 800 degrees C using a single-compartment reactor, which is constructed from CeO2-based solid electrolyte with two palladium electrodes. At all temperatures studied, both NO and CH4 were decomposed by applying a direct current to the reactor. NO was decomposed to N-2 in two different ways depending on the applied current. At low currents, NO was electrolysed together with O-2 at the palladium cathode; and, at high currents, NO was catalytically reduced over the palladium surface free from adsorbed oxygen. By investigating the influences of the concentration of NO, H2O, CO2, CH4 or C3H8 contained in the reactant gas to these two decompositions, their mechanisms are discussed in detail.