RAPID SINTERING IN NO OF NANOMETER-SIZED PT PARTICLES ON GAMMA-AL2O3 OBSERVED BY CO TEMPERATURE-PROGRAMMED DESORPTION AND TRANSMISSION ELECTRON-MICROSCOPY

被引：74

作者：

LOOF, P

STENBOM, B

NORDEN, H

KASEMO, B

机构：

[1] CHALMERS UNIV TECHNOL,DEPT APPL PHYS,S-41296 GOTHENBURG,SWEDEN

[2] CHALMERS UNIV TECHNOL,DEPT PHYS,S-41296 GOTHENBURG,SWEDEN

来源：

JOURNAL OF CATALYSIS | 1993年 / 144卷 / 01期

关键词：

D O I：

10.1006/jcat.1993.1314

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 dispersion loss due to sintering of nanometre-sized Pt particles on porous γ-Al2O3 was measured in different atmospheres (Ar, H2, O2, CO, NO) at temperatures 200-700°C. The methods used were temperature-programmed desorption with CO as the dispersion probing molecule, and transmission electron microscopy, respectively. The sintering rate was negligible in Ar and H2, accelerated in O2, as reported by several previous investigators, and dramatically enhanced in NO compared to O2. Possible sintering mechanisms are discussed. © 1993 by Academic Press, Inc.

引用

页码：60 / 76

页数：17

共 51 条

[1]

ANDERSON JR, 1975, STRUCTURE METALLIC C, pCH5

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