produce steam that drives a steam turbine during the combustion of natural gas and liquid fuels pollutants such as but not limited to carbon monoxide or u201c co u201d unburned hydrocarbons or u201c uhc u201d and nitrogen oxides or u201c no x u201d emissions may be formed and emitted into the atmosphere as will be appreciated co and uhc are generally formed during combustion conditions with lower temperatures and or conditions with an insufficient time to complete a reaction in contrast no x is generally formed under higher temperatures at least some known pollutant emission sources include devices such as but not limited to industrial boilers and furnaces larger utility boilers and furnaces reciprocating engines gas turbine engines steam generators and other combustion systems modern air quality regulations mandate continuingly reduced emission levels for power generating plants while at the same time fuel efficiency requirements continue to increase due to stringent emission control standards it is desirable to control no x emissions by suppressing the formation of it as will be understood nitrous oxides include no and no 2 with no 2 being known as a pollutant that produces a visible yellow plume from exhaust stacks and further creates u201c acid rain u201d combustion controls alone may prove inadequate to satisfy these often conflicting performance objectives and thus continued the improvement of post combustion exhaust gas treatment systems is desired as will be appreciated one technology for the control no x that is widely.