Method and apparatus for selectively removing oxygen using a non-catalytic electrode in an electrochemical cell
First Claim
1. A method of selectively removing oxygen from a gas stream containing NOx and oxygen comprising the steps of:
- a) contacting the gas stream with an electrochemical cell comprising an electrode consisting of La1-XMXFeO3, where M is selected from the group consisting of Sr, Ba, Ca, and combinations thereof, and X is between 0.05 and 0.5, wherein the electrode is on one side of a solid oxide electrolyte, and wherein a counter electrode is on the opposite side of the solid oxide electrolyte, and b) applying a voltage to the electrochemical cell.
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Abstract
A method and apparatus for selectively removing oxygen from a gas stream containing NOx and oxygen by contacting the gas stream with an electrochemical cell made from an electrode consisting of La1-XMXFeO3, (where M is selected from the group consisting of Sr, Ba, Ca, and combinations thereof, and X is between 0.05 and 0.5), a solid oxide electrolyte and a counter electrode, wherein the La1-XMXFeO3 electrode is on one side of a solid oxide electrolyte, and a counter electrode is on the opposite side of the solid oxide electrolyte, and applying a voltage to the electrochemical cell. The apparatus is preferably employed in a two chambered NOx sensor utilizing solid electrolyte electrochemical cells, wherein an electrochemical cell capable of catalyzing oxygen reduction without catalyzing NOx decomposition is formed as integral to the first chamber.
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Citations
13 Claims
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1. A method of selectively removing oxygen from a gas stream containing NOx and oxygen comprising the steps of:
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a) contacting the gas stream with an electrochemical cell comprising an electrode consisting of La1-XMXFeO3, where M is selected from the group consisting of Sr, Ba, Ca, and combinations thereof, and X is between 0.05 and 0.5, wherein the electrode is on one side of a solid oxide electrolyte, and wherein a counter electrode is on the opposite side of the solid oxide electrolyte, and b) applying a voltage to the electrochemical cell. - View Dependent Claims (2, 3, 4)
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5. An electrochemical cell for selectively removing oxygen from a gas stream containing NOx and oxygen comprising:
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a) an electrode consisting of La1-XMXFeO3, where M is selected from the group consisting of Sr, Ba, Ca, and combinations thereof, and X is between 0.05 and 0.5, b) the electrode being affixed to one side of a solid oxide electrolyte, c) a counter electrode affixed to the opposite side of the solid oxide electrolyte. - View Dependent Claims (6, 7, 8)
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- 9. An improvement to a two chambered NOx sensor utilizing solid electrolyte electrochemical cells, the improvement comprising forming an electrochemical cell with an electrode capable of catalyzing oxygen reduction without catalyzing NOx decomposition as integral to the first chamber of the two chambered NOx sensor.
Specification