Abstract

This study investigates the catalytic performance of a series of oxide catalysts for the combustion of a model gas mixture simulating emissions from biomass combustion. Low-cost raw materials were used to prepare monometallic catalysts (1%, 3%, and 5% K/MgO) and bimetallic catalysts (1%, 3%, and 5% K/(Cu/MgO), K/(Mn/MgO), and K/(Fe/MgO)). The model gas mixture consisted of CO, CH4, C10H8, CO2, air, and N-2. The catalysts were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), differential thermal analysis (DTA), nitrogen adsorption for BET surface area determination, and CO2 temperature-programmed desorption (CO2-TPD). The results demonstrate that all catalysts were active for the oxidation of CH4 and C10H8, which those containing 1% potassium exhibiting the highest activity and achieving complete conversion at temperatures below 600 degrees C. Among the studied materials, the 1%K(5%Mn/MgO) catalyst showed the best performance, reaching 100% conversion of CH4 and C(10)H(8 )at approximately 400 degrees C and 600 degrees C. The enhanced catalytic performance, particularly for the Mn-containing catalysts, is attributed to improved surface basicity and metal-support interactions at low potassium loadings, while higher K contents promote carbonate formation and surface area reduction, leading to partial deactivation.