Preparation And Characterization Of Catalysts For Selective Catalytic Reduction Of NO With NH₃ At Low-Temperature

Recently, the research of catalysts for SCR of NO with NH3 at low-temperature has attracted more concern. In this work, the purpose is to research novel catalysts used at low-temperature. Three types of catalysts (TiO2, carbon nanotubes (CNTs), graphene as carrier) were developed by impregnated method. The effect of preparation conditions of V2O5/TiO2 catalyst was investigated by the orthogonal experimental method. The CNTs pre-treated with acid was impregnated with different impregnants (active components including Mn, Fe, Cu, Ce, Mn-Ce, Mn-Fe, Fe-Ce). Then the activities of catalyst were investigated in detail and characterized by BET, XRD, TEM, XPS, TG methods. And the mechanism of Mn-Ce/CNTs catalyst was investigated based on the TPD tests and the transient response method. Furthermore, the activity of Fe/graphene catalyst was investigated. The main results showed that the active components were loaded successfully at the carriers by impregnation. The active component content had an outstanding influence on the de-NOx rate. The SCR performance of catalysts supported by CNTs had better activity. The factors, including reaction temperature, O2 content, n(NH3)/n(NO) and space velocity, had outstanding influence on the de-NOx rate. The mechanism of Mn-Ce/CNTs catalyst was Eley-Rideal. And the activity of Fe/graphene catalyst was lower than Fe/CNTs at the same conditions.