REDISPERSION OF PLATINUM ON PT/AL2O3 MODEL CATALYST IN OXYGEN STUDIED BY TRANSMISSION ELECTRON-MICROSCOPY

被引：32

作者：

RICKARD, JM

GENOVESE, L

MOATA, A

NITSCHE, S

机构：

[1] Centre de Recherche sur les Wcanismes da la Croissance Cristalline, CNRS, 13288 Marseille Cedex 09, Campus de Luminy

来源：

JOURNAL OF CATALYSIS | 1990年 / 121卷 / 01期

关键词：

D O I：

10.1016/0021-9517(90)90224-8

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：

A model Pt/Al2O3 catalyst was studied by transmission electron microscopy and Auger electron spectroscopy. O2 treatments under industrial catalyst regeneration conditions (500°C, 20 Tort, 1 h) transform a monomodal distribution of Pt particles (mean diameter 18 Å) into a bimodal distribution consisting of a phase of particles 40 to 100 Å in diameter and a phase of very small clusters (diameter < 10 Å). This observation of stable small clusters is direct evidence for a Pt catalyst dispersion in O2. Auger spectroscopy gives in situ information about particle transformation and support interaction. An exchange of matter between particles which operates on a molecular scale and might include platinum oxide is postulated. © 1990.

引用

页码：141 / 152

页数：12

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