Due　to　the　presence　of　SO2　in　flue　gas,　SCR　catalysts　with　high　SO2　tolerance　are　desperately　required.　However,　except　vanadium-based　catalysts,　most　metal　oxide　catalysts　exhibit　low　SO2　tolerance.　In　this　research　study,　CuSO4/TiO2,　Fe2(SO4)3/TiO2,　MnSO4/TiO2,　Ce(SO4)2/TiO2　and　CoSO4/TiO2　catalysts　were　prepared　via　a　sol-gel　protocol　and　used　in　the　NH3-SCR　reaction.　Low-temperature　N2-sorption,　XRD,　FT-IR,　XPS,　H2-TPR,　NH3-TPD　and　in　situ　DRIFTS　were　used　to　characterize　the　physicochemical　properties　of　the　prepared　catalysts.　The　presence　of　SO2　had　little　influence　on　the　activity　of　all　metal　sulfate　catalyst　samples.　CuSO4/TiO2　showed　the　highest　SCR　activity　and　apparent　activation　energy　among　the　metal　sulfate　catalysts　following　the　sequence　of　CuSO4/TiO2　©　The　Royal　Society　of　Chemistry　and　the　Centre　National　de　la　Recherche　Scientifique.