Investigation of the effect of Cu addition on the SO2-resistance of a CeTi oxide catalyst for selective catalytic reduction of NO with NH3

► SO2 sulfation resulted in the reduction of Ce4+ to Ce3+ on the CeTi oxide catalyst. ► The Cu atoms in the CeCuTi oxide will preserve the adjacent Ce4+. ► The reducibility of the CeTi catalyst significantly decreased due to the sulfation. ► The reducibility of the CeCuTi catalyst maintained at a qualified level for SCR.