Electrolysis: processes – compositions used therein – and methods – Electrolytic analysis or testing – For nitrogen or nitrogen containing compound
Reexamination Certificate
2007-05-15
2007-05-15
Olsen, Kaj K. (Department: 1753)
Electrolysis: processes, compositions used therein, and methods
Electrolytic analysis or testing
For nitrogen or nitrogen containing compound
C204S424000, C204S429000, C073S023310
Reexamination Certificate
active
11137693
ABSTRACT:
The present invention is a method and apparatus for measuring the total NOxconcentration in a gas stream utilizing the principles of a NOxsensor, i.e., mixed potential sensor. The exhaust gas is first conditioned by a catalyst assembly that converts the various species of nitrogen oxide gases present to a fixed steady state concentration ratio of NO2/NO, where NO2is approximately 0–10% of the total NOxconcentration present in the gas exhaust, thereby enabling the NOxsensor to generate a meaningful and reproducible determination of the concentration of total NOxpresent in the gas being measured. The catalyst assembly also functions to oxidize any unburned combustibles such as CH4, CO, etc., and remove potential contaminants such as SO2.
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Middlemas Michael
Nachlas Jesse A.
Nair Balakrishnan G.
Ceramatec, Inc.
Fonda David
Olsen Kaj K.
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