Catalytic and electrocatalytic oxidation of carbon monoxide on a Fe electrode in a solid electrolyte cell

摘要

The catalytic oxidation of carbon monoxide on Fe catalyst was studied at 300-500 deg C and atmospheric total pressure.The reaction was studied under both open- and closed-circuit operation in an yttria-stabilized zirconia solid elecrolyte cell.The technique of Solid Electroyte Potentiometry (SEP) was used to monitor the themodynamic activity of oxygen adsorbed on the Fe electrode under open circuit.Kinetic and potentiometric measurements were xombinecd in order to elucidate the reaction mechanism.The sesults are in agreement with a Langmuir-Hinselwood type of adsorption-reaction with two different adsorption sites ofr carbon monoxide and oxygen.Under closed circuit,the effect of clectrochemical oxygen "pumping" to the catalyst was wxamined.The operation of the cell wes almost Faradaic as the rate enhancement factor (A) values measured were close to unity.