NOx storage capacity,SO2 resistance and regeneration of Pt/(Ba)/CeZr model catalysts for NOx-trap system |
| |
Authors: | Corbos E. C. Elbouazzaoui S. Courtois X. Bion N. Marecot P. Duprez D. |
| |
Affiliation: | (1) Laboratoire de Catalyse en Chimie Organique, UMR 6503 CNRS-Université de Poitiers, 40 avenue du recteur Pineau, 86022 Poitiers cedex, France |
| |
Abstract: | NOx storage capacity, sulphur resistance and regeneration of 1wt%Pt/Ce0.7Zr0.3O2 (Pt/CeZr) and 1wt%Pt/10wt%BaO/Ce0.7Zr0.3O2 (Pt/Ba/CeZr) catalysts were studied and compared to a 1wt%Pt/10wt%BaO/Al2O3 (Pt/Ba/Al) model catalyst submitted to the same treatments. Pt/Ba/CeZr presents the best NOx storage capacity at 400 °C in accordance with basicity measurements by CO2 TPD and Pt/CeZr shows the better performance at 200 °C mainly due to a low sensitivity to CO2 at this temperature. For all samples, sulphating induces a detrimental effect on NOx storage capacity but regeneration at 550 °C under rich conditions generally leads to the total recovery of catalytic performance. However, the nearly complete sulphur elimination is only observed on Pt/CeZr. Moreover, an oxidizing treatment at 800 °C leads to partial sulphates elimination on the Pt/CeZr catalyst whereas a stabilization of sulphates on Ba containing species is observed. |
| |
Keywords: | NOx trap SO2 regeneration ceria– zirconia |
本文献已被 SpringerLink 等数据库收录! |
|