Propane oxidation and NO reduction at the proton conductor-electrocatalyst interface were investigated using electrochemical cells and impregnated catalysts. Sn0.9In0.1P2O7 and Pt or Pt-Rh were used as the proton conductor and electrocatalyst, respectively. In a gaseous mixture of propane, H2O, and NO. H2O is dissociated into protons and electrons at anodic sites at the interface and the resultant active oxygen oxidizes propane to CO2. Separately. NO reacts with protons and electrons to form N2O at cathodic sites at the interface. Under stoichiometric conditions, including 1000 ppm propane, 1000 ppm NO, 3% H2O, and 4500 ppm O-2, the temperatures at which the above series of reactions could successfully achieve 50% conversion (T-50%) was reduced to 310 and 385 degrees C for propane and NO, respectively, over a 0.01 wt.% Pt/Sn0.9In0.1P2O7 catalyst. These were much lower than T-50% of 430 and 535 degrees C for propane and NO, respectively, over a 0.01 wt.% Pt/-gamma-Al2O3 catalyst. Moreover, the addition of 0.005 wt.% Rh to the Pt/Sn0.9In0.1P2O7 catalyst enhanced NO reduction by promoting the dissociative adsorption of NO, thus providing a further reduction of T-50% for the NO reaction to 355 degrees C. 2011 Elsevier By. All rights reserved.