Potentiometric sensors comprising yttria-stabilized zirconia and measurement method of total nox sensing without co interference

Abstract

A novel measurement system for determining total NO , including NO and NO concentration without interference from CO, from a gas sample is presented. The measurement system comprises a gas conduit having an upstream end and a downstream end. The gas conduit carries a gas comprising NO . Disposed within the gas conduit is a catalytic filter comprising platinum and a zeolite. The gas flowing through the gas conduit interacts with the catalytic filter to form an equilibrium mixture of NO and NO from the gas comprising NO . The measurement system further comprises a sensor element comprising an electrolyte substrate upon which are disposed a sensing potentiometric electrode adapted to contact the equilibrium mixture of NO and NO and a reference potentiometric electrode. In practice, there should be a temperature difference between the catalytic filter and the sensor element. Also provided is a method of determining the total NO content in a gas comprising NO based on the measurement system.