The Mechanism of Selective NO x Reduction by Hydrocarbons in Excess Oxygen on Oxide Catalysts: II. Spectral and Kinetic Characteristics of Intermediate Complexes on the Commercial NTK-10-1 Catalyst

Quantitative spectrokinetic in situ measurements showed that the nitrate complex is an intermediate species in the process of the selective reduction of nitrogen oxides by propane on the commercial NTK-10-1 catalyst at T > 150°C. A nitroorganic compound is formed via the next step and is capable of transforming into the products of complete oxidation and into nitrogen oxides in the oxidative medium. At T < 150°C, the reaction occurs via the formation and further transformation of the nitrite complex. This process explains the unexpectedly high activity of the catalyst at low temperatures.