Development of Ag-Ti-Nb/Cordierite Catalyst for HC-SCR with Impregnation Method
Various emission control systems have been used in diesel engines to reduce NOx emissions. Nowadays, Selective Catalytic Reduction (SCR) is one of most popular and effective systems, especially in heavy vehicles. In this experimental study, synthesizing of Ag based catalyst for Hydrocarbon- Selective Catalytic Reduction (HC-SCR) systems were studied with impregnation method. Phases of the impregnation method were acidic treatment of cordierite, solution preparation with ultrasonic blender, evaporation, grinding, calcination and drying. Acidic treatment of cordierite were carried out in order to obtained high surface. Different metal nanoparticles such as silver nitrate (AgNO3), niobium (V) chloride (NbCl5) and titanium dioxide (TiO2) were used to coat the cordierite (2Al2O3-5SiO2-2MgO) structure. Molar values of TiO2, AgNO3 and NbCl5 were 0.9 M, 0.05 M, and 0.05 M, respectively. For determining the chemical and physical properties of the catalyst, Scanning Electron Microscopy (SEM), Inductively Coupled Mass Plasma Spectrometer (ICP), X-Ray Diffraction (XRD) and Brunauer-Emmett-Teller (BET) were carried out. Surface area and properties of cordierite structure with acidic treatment improved significantly. The catalyst materials were dispersed homogenously on main structure surface. In addition, these catalyst materials were penetrated the entire surface of the pores.
Keywords - Catalyst, SCR, SEM, ICP, XRD, BET