NOx storage and high temperature soot oxidation on Pt-Sr/ZrO2 catalyst

Abstract

NOx storage-release and soot oxidation have been studied using strontium promoted zirconia with different surface areas. It was found that the amount of the adsorbed NOx increases with the increase of the support surface and Sr concentration up to 20 wt% Sr. Introduction of platinum has no effect on the amount of NOx stored, but improve soot oxidation due to recycling of NO to NO2. A combination of oxidation catalyst with NOx storage materials enables to lower the temperature of 20% soot conversion up to 100 °C in comparison with un-catalyzed soot oxidation. © 2009 The Author(s).