Low-temperature NOx decomposition using an electrochemical reactor

We attempted to fabricate and evaluate a NO(x) decomposition electrochemical reactor with an additional NO(x) adsorption layer on a multilayer catalytic cathode and investigated a cell operating method to achieve low-temperature operation. To clarify the capability of a NO(x) adsorption layer, we carried out the NO(x) decomposition measurements of the cell. As a result, NO(x) adsorption layers have improved the NO(x) decomposition properties, though the current values of each cell were almost the same. The NO decomposition by a 10 mol % Gd-doped CeO(2) based cell with a Pt/K/AI(2)O(3) adsorbent took onset around 225 degrees C. It was clarified that the starting temperature and the efficiency of the NO(x) decomposition are heavily dependent on the adsorptivity of NO(x) adsorbent and the cell operating voltage mode. (C) 2008 The Electrochemical Society.