Bimetallic particle formation in Pt-Re/Al2O3 reforming catalysts revealed by energy-dispersive X-ray spectrometry in the analytical electron microscope

被引：27

作者：

Prestvik, R ^{[1
]}

Totdal, B

Lyman, CE

Holmen, A

机构：

[1] SINTEF, N-7034 Trondheim, Norway

[2] Norwegian Univ Sci & Technol, Dept Phys, N-7034 Trondheim, Norway

[3] Lehigh Univ, Dept Mat Sci & Engn, Bethlehem, PA 18015 USA

[4] Norwegian Univ Sci & Technol, Dept Ind Chem, N-7034 Trondheim, Norway

来源：

JOURNAL OF CATALYSIS | 1998年 / 176卷 / 01期

关键词：

D O I：

10.1006/jcat.1998.2025

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：

The metal function of a commercial 0.3-0.3 wt% Pt-Re/Al2O3 catalyst was studied by scanning transmission electron microscopy (STEM) and energy dispersive X-ray spectrometry (EDX). Evidence for platinum-rhenium bimetallic particle formation in the reduced catalyst has been established. The degree of Pt-Re interaction is highly dependent on the conditions employed during catalyst pretreatment. The highest degree of Pt-Re interaction is obtained if the catalyst is not dehydrated prior to reduction. High-temperature N-2 treatment causes platinum oxide decomposition, sintering, and a low degree of Pt-Re interaction. The part of the rhenium not associated with platinum is possibly distributed on the surface of the alumina support as submicroscopic particles. (C) 1998 Academic Press.

引用

页码：246 / 252

页数：7

共 18 条

[1] THE EFFECT OF RE, S, AND CL ON THE DEACTIVATION OF PT/GAMMA-AL2O3 REFORMING CATALYSTS [J].