Influence of oxidizing and reducing treatments on the metal-metal interactions and on the activity for nitrate reduction of a Pt-Cu bimetallic catalyst

被引：70

作者：

Epron, F ^{[1
]}

Gauthard, F ^{[1
]}

Barbier, J ^{[1
]}

机构：

[1] Univ Poitiers, CNRS, UMR 6503, Catalyse Chim Organ Lab, F-86022 Poitiers, France

来源：

APPLIED CATALYSIS A-GENERAL | 2002年 / 237卷 / 1-2期

关键词：

nitrate; nitrite; Pt-Cu catalysts; catalytic reduction; TPR; morphological modifications; pre-treatment effect;

D O I：

10.1016/S0926-860X(02)00331-9

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：

Bimetallic Pt-Cu/gammaAl(2)O(3) catalyst has been prepared by controlled deposition of copper onto platinum particles according to a redox reaction between hydrogen, pre-adsorbed on metallic platinum, and Cu2+ ions in water. This catalyst has been submitted to either oxidizing or reducing treatments, at ambient temperature or at 400degreesC. The interaction between copper and platinum in the bimetallic catalysts was estimated from temperature-programmed reduction (TPR) profiles, determined after various pre-treatments, and compared to that of a fresh catalyst. It was demonstrated that reducing and oxidizing pre-treatments noticeably affect the interactions between platinum and copper and consequently the catalytic activity for nitrate reduction in water. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：253 / 261

页数：9

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