Electrochemical removal of NO in the presence of excess O 2, H 2O and CO 2 using Sm 2O 3-doped CeO 2 as a solid electrolyte

Abstract

Electrochemical removal of NO from a gas stream containing 2% O 2, 5% H 2O and 5% CO 2 has been carried out between 400 and 800 °C using a single-compartment reactor, constructed from CeO 2-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, H 2O or CO 2 was investigated at 450 °C in detail.