The Mechanism of Selective NO x Reduction by Hydrocarbons in Excess Oxygen on Oxide Catalysts: I. Adsorption Properties of the Commercial NTK-10-1 Catalyst

According to X-ray phase and spectral analyses, the NTK-10-1 catalyst is a mixture of ZnO, CuO, NiO, ZnAl₂O₄, CuAl₂O₄, and CaCO₃. Under conditions of selective reduction of nitrogen oxides by propane, nitrite and nitrate complexes are formed on the surface of the NTK-10-1 catalyst. With an increase in temperature, nitrite complexes transform to nitrate complexes at a rate that decreases in the presence of propane in the gas phase. Propane adsorption is an activated process in which oxygen plays an important role. The results of temperature-programmed reduction showed that oxygen readily desorbs from the catalyst surface even under oxidative conditions.