Authors: J Schobing V Tschamber J F Brilhac A Auclaire R Vonarb
Publish Date: 2016/05/03
Volume: 59, Issue: 10-12, Pages: 1013-1019
Abstract
The aim of this work is to quantify to what extent the presence of calcium zinc and/or phosphorus in realistic concentrations affects the efficiency of a commercial full body type SCR V catalyst used for offroad vehicles Samples containing Ca Zn and P and combinations thereof were prepared by incipient wetness impregnation of the catalyst The loading of these elements was set at 024 or 1 wt Experiments carried out on samples with a loading of 024 wt of the inorganic element showed that Ca and Zn reduce the DeNOx activity of the SCR catalyst at low temperature 300 °C A loading of phosphorus equals to 1 wt is needed to observe a similar deactivation at low temperature than the one obtained in presence of 024 wt Ca The simultaneous presence of Ca and Zn on the catalyst increases the DeNOx deactivation without insofar as the additivity of individual effect is observed Similarly introduction of 1 wt P together with Ca and Zn results in less dramatic consequences to catalyst efficiency than impregnation of P alone These results were attributed to the formation of phosphate complexes thereby reducing the catalytic deactivation the inorganic elements
Keywords: