The Ohio State University

Nicholas F Szabo

Prabir K Dutta

Sheikh A Akbar

Hongbin Du

A potentiometric sensor for nitrogen oxide (NO) measurement based on yttria-stabilized zirconia with a zeolite-modified electrode is presented. A potentiometric sensor of the present invention comprises a tube having an interior and an exterior. A cap member comprising yttria-stabilized zirconia closes one end of the tube. The cap member has an interior surface exposed to the interior of the tube where a first electrode is disposed. The first electrode is then covered with a zeolite layer. A second electrode is disposed on the exterior of the cap member.

Potentiometric NOx sensors based on yttria-stabilized zirconia with zeolite modified electrode

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.

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Columbus, OH, United States of America

Nicholas F Szabo