Electrolysis: processes – compositions used therein – and methods – Electrolytic analysis or testing – For nitrogen or nitrogen containing compound
Patent
1995-02-02
1997-07-01
Bell, Bruce F.
Electrolysis: processes, compositions used therein, and methods
Electrolytic analysis or testing
For nitrogen or nitrogen containing compound
204426, 204428, 204421, 204409, 204425, 205784, G01N 2726
Patent
active
056434294
ABSTRACT:
Sensors (10, 40) accurately measure the concentration of an oxide compound, such as nitrogen oxide NO.sub.x, in a gas mixture (11) which can include oxygen O.sub.2. The sensors (10, 40) each comprise a chamber (12, 42) adapted to receive the gas mixture (11) as well as first and second electrochemical cells (16, 17) for consuming oxygen and/or the oxide compound in the chamber (12, 42). The first electrochemical cell (16) comprises a first internal electrode (16a) inside the chamber (12, 42), a first external electrode (16b) outside the chamber (12, 42), and a first electrolyte body (14') therebetween. The second electrochemical cell (17) comprises a second internal electrode (17a) inside the chamber (12, 42), a second external electrode (17b) outside the chamber (12, 42), and a second electrolyte body (14") therebetween. The first and second electrolyte bodies (14', 14") are permeable to oxygen ions. Significantly, the first and second internal electrodes (16a, 17a) are metal oxides having a perovskite lattice structure, which generally exhibit high relative selectivity between oxide compounds, including NO.sub.x, and O.sub.2. The electrical characteristics of the first and second electrochemical cells (16, 17) are manipulated and/or monitored in order to determine the concentration of NO.sub.x within the chambers (12, 42) and the gas mixture (11).
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Bell Bruce F.
Gas Research Institute
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