Characterization of niobia-supported palladium-cobalt catalysts

被引：54
|
作者：
Noronha, FB
Schmal, M
Moraweck, B
Delichère, P
Brun, M
Villain, F
Fréty, R
机构：
[1] Univ Fed Rio de Janeiro, COPPE, PEQ, NUCAT, BR-21941 Rio De Janeiro, Brazil
[2] Inst Rech Catalyse, CNRS, F-69626 Villeurbanne, France
[3] Ctr Univ Paris Sud, LURE, F-91898 Orsay, France
[4] LACE, CNRS, Lab Applicat Chim Environm, F-69622 Villeurbanne, France
来源：
JOURNAL OF PHYSICAL CHEMISTRY B | 2000年 / 104卷 / 23期
关键词：
D O I：
10.1021/jp992777o
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 ; 081704 ;
摘要：
Niobium oxide supported Pd-Co catalysts were characterized through XPS (X-ray photoelectron spectroscopy), (XPS), temperature-programmed reduction (TPR), magnetic measurements, X-ray diffraction, and extended X-ray absorption fine structure (EXAFS). XPS analyses suggested the presence of Co3O4 particles and Co2+ surface phase. TPR and magnetic measurements showed that the palladium addition promoted not only the reduction of Co3O4 particles but also the cobalt surface phase. Magnetic measurements and EXAFS analyses revealed the Pd-Co alloy formation during reduction. A model represented by bimetallic particles enriched with palladium and particles containing only cobalt was proposed.
引用
收藏
页码：5478 / 5485
页数：8
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