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The purpose of this communication is to report the discovery of a new rapid homogeneous gas-phase reaction. This new reaction is the NH3-NO-02 reaction. There is, of course, nothing new about the reaction of NH3 and NO, the reaction of NH3 and 02, or the reaction of NO and 0 2 . The kinetics of these three re-

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The discovery and development of the Thermal DeNO, process are described. One important aspect of that development was the continuation of the basic research in order to develop the computer model of the NO reduction chemistry. This model proved useful in optimizing the application of the Thermal DeNO, process to boilers and furnaces, in understanding other potential applications, e.g., gas turbines, automobiles, fluid bed combustors, and low-Btu gas, and in understanding problems in the chemistry such as the self-inhibition effect and the lack of an effect from addition of sulfur oxides.

Since N3 is a stable molecule, one might expect the N–N2 exchange reaction to occur readily; however, if the reaction exists, its rate constant is ≤8 × 106 cc/mols at 1000 °C. An explanation in terms of spin conservation is discussed.

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