Structural evolution of Pt/ceria-zirconia TWC catalysts during the oxidation of carbon monoxide

被引：21

作者：

Martorana, A

Deganello, G

Longo, A

Prestianni, A

Liotta, L

Macaluso, A

Pantaleo, G

Balerna, A

Mobillo, S

机构：

[1] Univ Palermo, Dipartimento Chim Inorgan & Anal Stanislao Canniz, I-90128 Palermo, Italy

[2] CNR, ISMN, Sez Palermo, I-90146 Palermo, Italy

[3] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

[4] Univ Roma Tre, Dipartimento Fis E Amaldi, I-00146 Rome, Italy

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2004年 / 177卷 / 4-5期

关键词：

in situ XRD; synchrotron radiation; TWC; ceria-zirconia; CO oxidation;

D O I：

10.1016/j.jssc.2003.11.001

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The structural evolution of two Pt/ceria-zirconia catalysts, characterized by different amounts of supported Pt, was monitored by in situ X-ray diffraction during the anaerobic oxidation of CO at different temperatures. In a first phase, oxygen coming from the surface layers of the ceria-zirconia mixed oxide is consumed and no structural variation of the support is observed. After this induction time, bulk reduction of Pt/ceria-zirconia takes place as a step-like process, while the CO2 production continues at a nearly constant rate. This behavior is totally different from that of the metal-free support in similar reaction conditions, that show a gradual bulk reduction. In repeated oxidation-reduction cycles, it was observed that the induction time in Pt/ceria-zirconia is a function of the thermal history, of the amount of supported Pt and of the structural evolution of the samples. (C) 2003 Elsevier Inc. All rights reserved.

引用

页码：1268 / 1275

页数：8

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