Characterization of different Pt-Ru catalysts by X-ray diffraction and transmission electron microscopy

被引：66

作者：

Roth, C ^{[1
]}

Martz, N ^{[1
]}

Fuess, H ^{[1
]}

机构：

[1] Darmstadt Univ Technol, Inst Mat Sci, D-64287 Darmstadt, Germany

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2001年 / 3卷 / 03期

关键词：

D O I：

10.1039/b004887i

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：

Carbon-supported Pt-Ru (1 : 1)-catalysts have been synthesized by two reduction methods in an aqueous phase and in a third way in an organic solution and characterized in comparison to a commercial Pt-Ru/C catalyst purchased from E-TEK. X-ray diffraction and transmission electron microscopy were carried out on the different samples in the as-synthesized state and after heat-treatment at 500 degreesC in nitrogen and air atmospheres respectively. Powder patterns of the different catalysts in the as-synthesized state reveal a fcc pattern with d values matching or close to platinum. No evidence of metallic Ru or any oxide phases was found. After heat-treatment in nitrogen Ru reflections occur in the synthesized catalyst samples, backing the supposition of separate platinum and ruthenium particles instead of a Pt-Ru alloy.

引用

页码：315 / 319

页数：5

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