System and method for increasing the service life and/or catalytic activity of an scr catalyst and control of multiple emissions

A method for simultaneously increasing the active life of an SCR catalyst and controlling the selenium speciation in a flue gas and/or selenium speciation in at least one piece of emission control equipment, the method comprising the steps of:

• (A) providing at least one iron-bearing compound to a combustion zone or flue gas stream of a furnace, or boiler, prior to entry of the flue gas into an SCR;
• and
• (B) simultaneously permitting the at least one iron-bearing compound to react with any gaseous phosphorus compounds, or phosphorus-containing compounds, present in the combustion zone or flue gas as well as any selenium and/or selenium compounds present in the combustion zone, flue gas, gas phase and/or at least one piece of emission control equipment prior to the entry of the flue gas into the SCR,
• wherein the method achieves an increase in either one, or both, of a catalytic activity and/or a catalytic lifespan of at least about 10 percent at an operational time of at least about 2,000 hours while simultaneously permitting the control of the selenium speciation in one or more of the gas phase and/or the at least one piece of emission control equipment thereby resulting in a reduction in the amount of selenium emitted in a flue gas and/or from one or more pieces of emission control equipment.

A method for controlling the selenium speciation in a flue gas and/or in at least one piece of emission control equipment in conjunction with a post combustion CO2 capture process, the method comprising the steps of:

• (I) providing at least one metal-bearing compound to a combustion zone or flue gas stream of a furnace, or boiler, prior to entry of the flue gas into an SCR;
• and
• (II) permitting the at least one metal-bearing compound to react with any selenium and/or selenium compounds present in the combustion zone, flue gas, gas phase and/or at least one piece of emission control equipment,
• wherein the method permits the control of the selenium speciation in one or more of the gas phase and/or in the at least one piece of emission control equipment thereby resulting in a reduction in the amount of selenium emitted in a flue gas, from one or more pieces of emission control equipment and/or in at least one amine compound that is utilized in conjunction with the post combustion CO2 capture process.