Regeneration of thermally aged Pt-Rh/CexZr1-xO2-Al2O3 model three-way catalysts by oxychlorination treatments

被引：56

作者：

Anderson, J. A. ^{[1
]}

Daley, R. A.

Christou, S. Y.

Efstathiou, A. M.

机构：

[1] Univ Aberdeen, Surface Chem & Catalysis Grp, Aberdeen AB24 3UE, Scotland

[2] Univ Cyprus, Dept Chem, Heterogeneous Catalysis Lab, CY-1678 Nicosia, Cyprus

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2006年 / 64卷 / 3-4期

关键词：

Pt-Rh/CexZr1-xO2-Al2O3; three-way catalysts; regeneration; redispersion; thermal ageing; oxychlorination;

D O I：

10.1016/j.apcatb.2005.12.007

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 [物理化学]; 081704 [应用化学];

摘要：

Pt-Rh/CexZr1-xO2-Al2O3 with 0.6 and 1.0 wt.% noble metal loadings were prepared and characterized for their metal dispersion with respect to CexZr1-xO2-free Pt-Rh/Al2O3 in fresh, thermally aged and oxychlorinated states. Thermal ageing at 973 K led to loss of metal dispersion in all cases but to negligible effect on the dispersion of the CexZr1-xO2 component where present. Oxychlorination was able to fully recover metal dispersion in all cases but led to different effects on the redox properties of CexZr1-xO2 which appeared to be related to the metal loadings. Despite showing improved dispersion following regeneration, higher loaded catalyst showed no improvement in light-off performance for either NO reduction or CO oxidation and showed poorer oxygen storage (OSC) ability, particularly at higher temperatures. Lower loaded catalyst showed improved dispersion, improved OSC and reduced light-off temperatures for NO reduction and CO oxidation after oxychlorination compared to that in the thermally aged state. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：189 / 200

页数：12

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