CATALYTIC REDUCTION OF NOX USING METHANE IN THE PRESENCE OF OXYGEN

摘要

PATENT 211PUS04524 The invention describes a catalytic process for destroying NOx from oxygen-containing combustion products where-in methane serves as a reductant. The process comprises contacting the NOx-containing combustion products with a desired amount of methane and oxygen in the presence of a metal-exchanged crystalline zeolite having a silicon to aluminum ratio of greater than or equal to about 2.5 under conditions sufficient to effect conversion to gaseous nitrogen, water and carbon oxides. The zeolites are exchanged with a cation selected from the group consisting of cobalt, nickel, iron, chromium, rhodium and manganese.