Pt–Pd/MnOx–Al2O3 Oxidation Catalysts: Prospects of Application for Control of the Soot Emission with Diesel Exhaust Gases

Abstract

Together with exhaust gases from motor vehicles with diesel engines, soot and toxic nitrogen oxides are released into the environment. In this work, we consider the possibility of removing diesel soot on the surface of the Pt–Pd/MnO_x–Al₂O₃ oxidation catalyst with a low Pt–Pd content. The rate and activation energy of the catalytic oxidation of diesel soot with oxygen and NO_x were studied in the isothermal mode and compared with the kinetic characteristics of the oxidation of charcoal soot and two samples of synthetic soot (Printex U, Vulkan XC-72). The physicochemical properties of soot, such as nano- and microstructure, elemental composition, composition of surface functional groups, determine its oxidative reactivity, which is higher in mixtures with NO_x than in oxygen-containing mixtures.