Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1994-03-09
1995-03-14
Niebling, John
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
20415318, 20415314, 204425, 204426, 204428, 338 34, 73 2331, 422 94, 422 98, G01N 2726, G01N 3002, G01N 2700, H01C 700
Patent
active
053974425
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
Niebling John
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