Method and apparatus for reducing a nitrogen oxide
First Claim
1. An apparatus for reducing a nitrogen oxide contained in a multi-component gas mixture emitted by an emissions source, comprising(a) an exhaust conduit for transporting the gas mixture downstream from the emissions source,(b) an injector for injecting a reducing agent into the conduit, and(c) one or more gas analyzers located in the conduit downstream of the injector;
- wherein a gas analyzer comprises an array of chemo/electro-active materials selected as a member from the group of three arrays of chemo/electro-active material consisting of;
(i) an array comprising ZnOx, NbaTibOx, NiaZnbOx, SbaSnbOx, TaaTibOx, and TiaZnbOx;
(ii) an array comprising SnOx, TiaZnbOx, NbaTibOx, NiaZnbOx, TaaTibOx, and GaaTibZncOx;
(iii) an array comprising NbaTibOx, NiaZnbOx, GaaTibZncOx;
SbaSnbOx, TaaTibOx, and TiaZnbOx;
wherein a, b and c are each independently about 0.0005 to about 1; and
wherein x is a number sufficient so that the oxygen present balances the charges of the other elements in the chemo/electro-active material; and
wherein a gas analyzer outputs at least one signal that is related to the individual concentration within the gas mixture of an individual gas component therein, and at least one signal that is related to the collective concentration within the gas mixture of a subgroup of the component gases therein.
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Abstract
This invention relates to an apparatus for reducing a nitrogen oxide. In particular, it relates to the use of a gas analyzer to obtain information related to the compositional content of a multi-component gas mixture that contains a nitrogen oxide for the purpose of assisting in the control of the reduction. In particular, the apparatus provides control of the reaction of reduction, and, more particularly, control of the injection of a reducing agent into the gas mixture containing the nitrogen oxide. The apparatus enables the calculation of the amount of reducing agent to be injected in relation to information about the compositional content of the gas mixture, and a gas analyzer containing an array of chemo/electro-active materials may be used in conjunction therewith.
47 Citations
22 Claims
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1. An apparatus for reducing a nitrogen oxide contained in a multi-component gas mixture emitted by an emissions source, comprising
(a) an exhaust conduit for transporting the gas mixture downstream from the emissions source, (b) an injector for injecting a reducing agent into the conduit, and (c) one or more gas analyzers located in the conduit downstream of the injector; -
wherein a gas analyzer comprises an array of chemo/electro-active materials selected as a member from the group of three arrays of chemo/electro-active material consisting of; (i) an array comprising ZnOx, NbaTibOx, NiaZnbOx, SbaSnbOx, TaaTibOx, and TiaZnbOx; (ii) an array comprising SnOx, TiaZnbOx, NbaTibOx, NiaZnbOx, TaaTibOx, and GaaTibZncOx; (iii) an array comprising NbaTibOx, NiaZnbOx, GaaTibZncOx;
SbaSnbOx, TaaTibOx, and TiaZnbOx;wherein a, b and c are each independently about 0.0005 to about 1; and wherein x is a number sufficient so that the oxygen present balances the charges of the other elements in the chemo/electro-active material; and wherein a gas analyzer outputs at least one signal that is related to the individual concentration within the gas mixture of an individual gas component therein, and at least one signal that is related to the collective concentration within the gas mixture of a subgroup of the component gases therein. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification