In situ transmission electron microscopy investigation of Ce(IV) and Pr(IV) reducibility in a Rh (1%)/Ce0.8Pr0.2O2-x catalyst

被引：21

作者：

López-Cartes, C

Bernal, S

Calvino, JJ

Cauqui, MA

Blanco, G

Pérez-Omil, JA

Pintado, JM

Helveg, S

Hansen, PL

机构：

[1] Univ Cadiz, Dept Ciencia Mat & Ingn Met & Quim Inorgan, Cadiz 11510, Spain

[2] Haldor Topsoe Res Labs, DK-2800 Lyngby, Denmark

来源：

CHEMICAL COMMUNICATIONS | 2003年 / 05期

关键词：

D O I：

10.1039/b211786j

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In-situ Atomic Resolution Transmission Electron Microscopy studies carried out on a Rh/Ce0.8Pr0,2O2-x catalyst, under hydrogen in the temperature range 298-1223 K, show the occurrence of consecutive reduction of Pr4+ and Ce4+ ions, and the formation of an oxygen-deficient Ln(16)O(30) (Ln: Ce, Pr) ordered phase.

引用

收藏

页码：644 / 645

页数：2

相关论文

共 21 条

[1]

Ahn C.C., 1983, EELS ATLAS

[2] Oxygen buffering capacity of mixed cerium terbium oxide: A new material with potential applications in three-way catalysts [J].

Bernal, S ;

Blanco, G ;

Cauqui, MA ;

Corchado, P ;

Pintado, JM ;

RodriguezIzquierdo, JM .

CHEMICAL COMMUNICATIONS, 1997, (16) :1545-1546

[3] Influence of the nature of the noble metal (Rh,Pt) on the low-temperature reducibility of a Ce/Tb mixed oxide with application as TWC component [J].

Blanco, G ;

Pintado, JM ;

Bernal, S ;

Cauqui, MA ;

Corchado, MP ;

Galtayries, A ;

Ghijsen, J ;

Sporken, R ;

Eickhoff, T ;

Drube, W .

SURFACE AND INTERFACE ANALYSIS, 2002, 34 (01) :120-124

[4] Atom-resolved imaging of dynamic shape changes in supported copper nanocrystals [J].

Hansen, PL ;

Wagner, JB ;

Helveg, S ;

Rostrup-Nielsen, JR ;

Clausen, BS ;

Topsoe, H .

SCIENCE, 2002, 295 (5562) :2053-2055

[5] Atomic-resolution in situ transmission electron microscopy of a promoter of a heterogeneous catalyst [J].

Hansen, TW ;

Wagner, JB ;

Hansen, PL ;

Dahl, S ;

Topsoe, H ;

Jacobsen, CJH .

SCIENCE, 2001, 294 (5546) :1508-1510

[6] Lattice oxygen transfer in fluorite-type oxides containing Ce, Pr, and/or Tb [J].

Kang, ZC ;

Eyring, L .

JOURNAL OF SOLID STATE CHEMISTRY, 2000, 155 (01) :129-137

[7]

KANG ZC, 1997, AUST J CHEM, V49, P981

[8] INVESTIGATION OF SOME STRUCTURAL AND VALENCE PROBLEMS IN THE PRASEODYMIUM OXIDES BY X-RAY ABSORPTION-SPECTROSCOPY [J].

KARNATAK, RC ;

GASGNIER, M ;

DEXPERT, H ;

ESTEVA, JM ;

CARO, PE ;

ALBERT, L .

JOURNAL OF THE LESS-COMMON METALS, 1985, 110 (1-2) :377-384

[9] X-RAY ABSORPTION STUDIES OF CEO2, PRO2, AND TBO2 .1. MANIFESTATION OF LOCALIZED AND EXTENDED F-STATES IN THE 3D ABSORPTION-SPECTRA [J].

KARNATAK, RC ;

ESTEVA, JM ;

DEXPERT, H .

PHYSICAL REVIEW B, 1987, 36 (03) :1745-1749

[10] Rare-earth oxides with fluorite-related structures:: their systematic investigation using HREM images, image simulations and electron diffraction pattern simulations [J].

López-Cartes, C ;

Pérez-Omil, JA ;

Pintado, JM ;

Calvino, JJ ;

Kang, ZC ;

Eyring, L .

ULTRAMICROSCOPY, 1999, 80 (01) :19-39