Engelhard Corporation has been investigating catalytic combustion for low NOx applications since the 1970s [1]. Reactor systems have been developed for various applications including, gas turbines, boilers and automobiles. This paper will discuss the generic reactor system, its design and chemistry. An overview which shows the temperatures within the catalyst bed and the design parameter flexibility will be presented. The window of operation of the various reactors will be discussed as will life test data. Finally, the effect of fuel and temperature turndown and pressure will be discussed which demonstrate the feasibility of catalytically supported thermal combustion for natural gas fueled gas turbines.