Effect of acidic components (SO42- and WO3) on the surface acidity, redox ability and NH3-SCR activity of new CeO2-TiO2 nanoporous aerogel catalysts: A comparative study

•New CeTiSO42- and WO3-CeTi nanoporous aerogel catalysts for NH3-SCR reaction.•SO42- modifies the nature of Ce species and increases the acidity of the CeTi aerogel.•WO3 generates more reactive surface oxygen and active redox sites at CeTi surface.•WO3-CeTi displays the highest SCR activity at 320–400 °C (NO conversion > 90 %)•CeTiSO42- exhibits superior SCR performance at 450–500 °C (NO conversion > 90 %)