Solid electrolyte aided studies of NO-CO reaction on Pd

The Pd-catalyzed NO-CO reaction at temperatures between 320 and 480 degrees C exhibited electrochemical promotion. This reaction was performed in a fue l-cell configuration when Pd is coated on Y2O3-stabilized ZrO2. The electro chemical promotion of the catalytic activity and modification of the select ivity to N2O is reversible and this system showed both electrophilicity and electrophobicity, depending on the direction of oxygen ion pumping. In a t ypical experiment, the enhancement of reaction rate is 100 times greater th an the rate of oxygen ion removal from the catalyst electrode. Rate enhance ment, which is defined as the ratio of the reaction rate under electrochemi cal oxygen removal to the rate under open circuit, of rho (CO2) = 2.2, rho (N2O) = 2.2 and rho (N2) = 4.2 were measured for V-WR = - 1.8 V at 370 degr eesC. (C) 2000 Elsevier Science B.V. All rights reserved.