Electrochemical Removal of NO_x-gasses by use of LSM-cathodes Impregnated with a NO_x Storage Compound

摘要

Electrochemical decomposition of NO on La_0.85Sr_0.15MnO_3-δ-Ce_0.90Gd_0.10O_1.95 electrodes with and without KNO3 impregnation is investigated. The KNO_3 is added as this compound is expected to work as a NO_x-storage compound. Measurements are made in the temperature range 300-400 ℃ and in three different atmospheres: 1000 ppm NO, 10% O_2 and 1000 ppm NO + 10% O_2. Electrochemical impedance spectroscopy and cyclic voltammetry are used for electrochemical characterization of the electrodes, and the conversion of NO and O_2 is measured on a mass-spectrometer. The results show a significant increase in the NO-conversion, when KNO3 is added to the Lao.85Sro.15MnO_3-δ-Ceo.90Gdo.10O1.95 electrodes.