NANOSCALE EVOLUTION WITH REDUCTION TEMPERATURE OF A Pd/Ce0.8Tb0.2O2-X/LaOX-Al2O3 CATALYST

  1. C. López-Cartes 1
  2. G. Blanco 1
  3. J.J. Calvino 1
  4. J.M. Gatica 1
  5. H. Vidal 1
  6. C.J. Kiely 2
  7. J.G. Zheng 2
  8. J.A. Pérez-Omil 1
  1. 1 Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica. Facultadde Ciencias. Universidad de Cádiz. Polígono Río San Pedro s/n. Apdo 40 Puerto Real, Cádiz 1151 O.Spain
  2. 2 Departments of Chemistry and Engineering. University of Liverpool, L69 3BX. UK
Actas:
Electron Microscopy and Analysis Group Conf. EMAG2001, Dundee, 2001

ISSN: 0951-3248

Año de publicación: 2001

Volumen: 168

Páginas: 413-416

Tipo: Aportación congreso

GOOGLE SCHOLAR

Resumen

A Pd/CeosTbo202-xiLaOx-Ah03 catalyst has been studied by HREM and EDS after reduction treatments in the temperature range 623 K -1173 K. HREM has revealed that up to 973K, both Pd and the Ce0.8Tb0.20 2_x mixed oxide are present as nanosized particles welldispersed over the La-modified alumina support. After reduction at 1173K drastic changes occur: 1) severe sintering of the metallic Pd particles; 2) incorporation of Al and La into the mixed oxide particles which transform into lantl)anide aluminates. According to EDS analysis two different aluminate phases are formed: one Ce,Tb-rich and the other La-rich.