Patent ID: 8716169

Claim:
A method for increasing the active life of an SCR catalyst, the method comprising the steps of: (a) providing at least one coal-based fuel to a furnace, or boiler; (b) subjecting the at least one coal-based fuel to a staged combustion process, wherein the staged combustion process produces at least one gaseous phosphorus compound and/or at least one gaseous phosphorus-containing compound; (c) providing at least one iron-bearing compound to a combustion zone of a furnace, or boiler, prior to entry of the flue gas into an SCR, wherein the SCR is located upstream of at least one air heater; and (d) permitting the at least one iron-bearing compound to react with the at least one gaseous phosphorus compound and/or the at least one gaseous phosphorus-containing compound present in the combustion zone or flue gas prior to the entry of the flue gas into the SCR to form an iron phosphorus-containing compound.