The X-ray photoelectron spectroscopy of surface composition of aged mixed copper manganese oxide catalysts

被引：40

作者：

Mirzaei, AA ^{[1
]}

Shaterian, HR ^{[1
]}

Kaykhaii, M ^{[1
]}

机构：

[1] Sistan & Balouchestan Univ, Fac Sci, Dept Chem, Zahedan 98135674, Iran

来源：

APPLIED SURFACE SCIENCE | 2005年 / 239卷 / 02期

关键词：

XPS; surface composition; aged catalyst; copper manganese oxide;

D O I：

10.1016/j.apsusc.2004.05.274

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 copper manganese oxide catalysts of approximate composition Cu1+xMn2-xO4 (x = 0.54 +/- 0.04), which was aged at various times and at different pH values, has been studied by X-ray photoelectron spectroscopy (XPS). In all cases, copper (II) and manganese (IV) are the only oxidation states. The copper/manganese concentration ratio exceeds the bulk value (0.5) at short ageing times, but falls to <0.4 on prolonged ageing. Sodium, which is believed to be a poison for the CO oxidation reaction; for which, the copper manganese oxide catalyst is the most useful, is formed on all samples, however, its concentration decreases significantly with increased ageing time. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：246 / 254

页数：9

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