The effect of indium addition on the properties and performance of Ag-TiO2 and Cu-TiO2 based SCR catalyst

This thesis investigated the effect of Indium (III) Nitrate Hydrate addition on the structural, chemical, and catalytic performance of TiO2-AgNO3-CuCl2-based selective catalytic reduction (SCR) catalysts. Experimental analyses and characterization techniques revealed that the TiO2-CuCl2 catalyst with % 3 Indium doping achieved a high NOx conversion efficiency of % 95,88 at 30000 h⁻¹ space velocity, 230 °C, and 4 kW power levels. BET and Langmuir's surface analyses demonstrated that Indium doping increased the total surface area of the catalyst, optimizing the microporous structures and thereby providing a broader active surface. Additionally, SEM-EDS analyses showed a homogeneous distribution of Indium and copper on the catalyst surface, which allowed for more efficient utilization of active regions and significantly enhanced reaction efficiency. Experimental data confirmed the direct and positive effects of increased temperature and power levels on NOx conversion efficiency, with stable and effective performance observed even at lower temperatures. These findings indicate that the catalyst CuCl2-TiO2-3In exhibits optimal performance at high temperatures and power levels, making it a reliable and efficient alternative for industrial applications. Keywords: Indium (III) Nitrate Hydrate, TiO2, SCR, NOx Reduction, Catalytic Performance