Patent ID: 8617473
Filing Date: 2013-12-31
Classification: B01D,F01N,Y02T

Abstract:
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 ZnO (ii) an array comprising SnO (iii) an array comprising Nb 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.