TRANSMISSION ELECTRON-MICROSCOPY AND ENERGY-DISPERSIVE X-RAY SPECTROSCOPY STUDIES OF PT-RE/ALPHA/AL2O3 CATALYSTS

被引：28

作者：

HUANG, Z

FRYER, JR

PARK, C

STIRLING, D

WEBB, G

机构：

[1] Department of Chemistry, University of Glasgow, Glasgow

来源：

JOURNAL OF CATALYSIS | 1994年 / 148卷 / 02期

关键词：

D O I：

10.1006/jcat.1994.1234

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 series of Pt/rAl2O3, Re/gamma-Al2O3, and Pt-Re/gamma-Al2O3 catalysts have been studied by transmission electron microscopy and energy dispersive X-ray spectroscopy. It has been shown that rhenium was not alloyed with platinum, but widely dispersed on the surface of alumina. Two types of platinum were found: (i) three-dimensional metallic particles, and (ii) small particles consisting of a few platinum atoms. Some aggregation of the platinum particles occurred during use of the catalysts in the reforming of octane. It is suggested that the interaction of rhenium with the alumina support and therefore the modification to the platinum play an essential role in promoting the enhanced stability and selectivity of these catalysts to cycloalkanes and aromatics in reforming reactions. (C) 1994 Academic Press, Inc.

引用

页码：478 / 492

页数：15

共 40 条

[1] CATALYTIC PROBE FOR ALLOY FORMATION IN SUPPORTED PTRE CATALYSTS - ISOTOPE EXCHANGE AND HYDROGENOLYSIS OF CYCLOPENTANE [J].