Experimental and theoretical studies on the influence of water vapor on the performance of a Ce-Cu-Ti oxide SCR catalyst

► H2O inhibits the SCR performance of the Ce-Cu-Ti-O catalyst at low temperatures. ► H2O enhances the NO conversion of the Ce-Cu-Ti-O catalyst at high temperatures. ► The presence of H2O would greatly decrease the NH3 adsorption amount. ► NH3 oxidation at high temperatures decreases with the addition of 10% H2O.