A superior Ce-W-Ti mixed oxide catalyst for the selective catalytic reduction of NOx with NH3

A superior Ce-W-Ti mixed oxide catalyst prepared by a facile homogeneous precipitation method showed excellent NH3-SCR activity and 100% N2 selectivity with broad operation temperature window and extremely high resistance to space velocity, which is a very promising catalyst for NOx abatement from diesel engine exhaust. The excellent catalytic performance is associated with the highly dispersed active Ce and promotive W species on TiO2. The introduction of W species could increase the amount of active sites, oxygen vacancies, and Brønsted and Lewis acid sites over the catalyst, which is also beneficial to improve the low temperature activity by facilitating “fast SCR” reaction and enhance both of the high temperature activity and N2 selectivity simultaneously by inhibiting the unselective oxidation of NH3 at high temperatures.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Ce-W-Ti mixed oxide catalyst prepared by homogeneous precipitation method. ► Excellent NH3-SCR activity and N2 selectivity in a wide temperature range. ► Extremely high durability to space velocity. ► Introduction of W species could increase the amount of active sites, oxygen vacancies, and Brønsted and Lewis acid sites.