NOx storage capacity, SO2 resistance and regeneration of Pt/(Ba)/CeZr model catalysts for NOx-trap system

被引：26
|
作者：
Corbos, E. C. [1 ]
Elbouazzaoui, S. [1 ]
Courtois, X. [1 ]
Bion, N. [1 ]
Marecot, P. [1 ]
Duprez, D. [1 ]
机构：
[1] Univ Poitiers, CNRS, UMR 6503, Lab Catalyse & Chim Organ, F-86022 Poitiers, France
来源：
TOPICS IN CATALYSIS | 2007年 / 42-43卷 / 1-4期
关键词：
NOx trap; SO2; regeneration; ceria-zirconia;
D O I：
10.1007/s11244-007-0142-x
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
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 degrees C in accordance with basicity measurements by CO2 TPD and Pt/CeZr shows the better performance at 200 degrees 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 degrees 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 degrees C leads to partial sulphates elimination on the Pt/CeZr catalyst whereas a stabilization of sulphates on Ba containing species is observed.
引用
收藏
页码：9 / 13
页数：5
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