Patent ID: 8323574
Filing Date: 2012-12-04
Classification: B01D,F01N,G01N,Y02A,Y02T,Y10T

Abstract:
1. An apparatus for reducing a nitrogen oxide gas emitted by a emissions source, comprising (a) an emissions source, (b) an exhaust conduit for transporting the nitrogen oxide gas downstream from the emissions source, (c) an injector for injecting a reducing agent into the conduit, and (d) one or more gas analyzers located in the conduit upstream from the injector, wherein a gas analyzer comprises an array of chemo/electro-active materials selected as a member from the group of five arrays of chemo/electro-active material consisting of: (i) an array comprising SnO (ii) an array comprising ZnO (iii) an array comprising Sb (iv) an array comprising SnO (v) an array comprising Ni 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.