Effect of Ca Doping on the Selective Catalytic Reduction of NO with NH3 Over Ce-Ti Oxide Catalyst.

Abstract: A series of Ca doped Ce-Ti oxides prepared by a single step sol-gel method were investigated for the selective catalytic reduction of NO with NH3. The results show that Ca doping had both positive and negative effects on the activities of Ce-Ti oxide. Ca0.1CT possessed the best catalytic activity and widest temperature window. Further investigations on BET, XRD, XPS, H2-TPR and NH3-TPD demonstrated that the good SCR performance of Ca0.1CT could be attributed to the increase in the amount of Ce3+ and surface adsorbed oxygen as well as the enhancement of Brønsted acidity and redox ability. In addition, the good dispersion of active Ce species, the alleviation of support sintering, and the interaction among Ce, Ti and Ca species were also responsible for its enhanced activity.Graphical Abstract: <graphic></graphic> [ABSTRACT FROM AUTHOR]