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The reaction characteristics of the SO2 oxidation catalyst by the catalyst preparation method were analyzed by investigating the catalyst properties on the TiO2 support using a vanadium-alkali (K) compound containing the catalyst. The slurry mix method and the dry ball milling method were used for the production of the catalyst. In this process, the difference in interaction between the active material (V) and the support (TiO2) has been confirmed. Especially, the high proportion of non-stoichiometric species of the initial catalyst reflects the high interaction between vanadium and TiO2. Therefore, an increase in non-stoichiometric species such as V4+ indicates an increase in the interaction between TiO2 and V2O5. In particular, the interaction between the support-active material improves the transfer of SO2 adsorbed on the support TiO2 to the active material (V2O5). Therefore, it induces the production of a high proportion of the active substance (VVO)2O(SO4)44− and consequently increases the SO2 oxidation performance. [ABSTRACT FROM AUTHOR]

This study investigated the SO2 resistance enhancement factors of silica with the V/SiW/TiO2 catalyst prepared using various precursors. BET, XPS, H2-TPR, DRIFT, and temperature-programmed desorption (TPD) were used to analyze the physical and chemical properties of the catalyst. The catalyst prepared with Dimethoxydimethylsilane (DMDMS), from various precursor silica fabricated to improve SO2 resistance, demonstrated the highest increase in resistance. The SO2 resistance improvement factor was confirmed to form Si2+(Si-O-Ti) species in the optimised V/SiW/TiO2 catalyst; the incoming SO2 was converted to Si(SO4). The formation of Si(SO4) increased the number of adsorbed sites for adsorbed NH3, in the form of SO4-NH3 to increase the amount of the reducing agent of NH3-SCR, and improve denitrification efficiency. It was optimal to increase the VOx surface density whilst increasing the ratio of the Si2+ species, the Si-sulfate site of SiW/TiO2 support, to improve denitrification performance and SO2 resistance concurrently. The SO2 resistance improvement factor was confirmed to form Si2+(Si-O-Ti) species. In the optimised V/SiW/TiO2 catalyst; the incoming SO2 was converted to Si(SO4). The formation of Si(SO4) increased active sites for adsorbed NH3, in the form of SO4-NH3 to improve denitrification efficiency. [ABSTRACT FROM AUTHOR]