Structure and speciation of chromium ions in chromium doped Fe2O3 catalysts

被引：19

作者：

Martis, Vladimir ^{[1
,2
,3
]}

Oldman, Richard ^{[1
,3
]}

Anderson, Ross ^{[3
]}

Fowles, Martin ^{[3
]}

Hyde, Tim ^{[3
]}

Smith, Richard ^{[3
]}

Nikitenko, Sergey ^{[2
]}

Bras, Wim ^{[2
]}

Sankar, Gopinathan ^{[1
,3
]}

机构：

[1] UCL, Dept Chem, London WC1H 0AJ, England

[2] DUBBLE ESRF, Netherlands Org Sci Res NWO, F-38000 Grenoble, France

[3] Johnson Matthey Technol Ctr, Reading RG4 9NH, Berks, England

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2013年 / 15卷 / 01期

基金：

英国工程与自然科学研究理事会;

关键词：

GAS SHIFT REACTION; X-RAY-ABSORPTION; IN-SITU; SUPPORTED CHROMIUM; ACTIVATION; EXAFS; COORDINATION; SILICATE; STATE;

D O I：

10.1039/c2cp43307a

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：

In this paper, we report a detailed characterisation of chromium doped iron oxide catalysts using a range of techniques to establish the nature of chromium species in the near surface and bulk of iron oxide, high-temperature shift (HTS) catalysts. In particular we have employed X-ray absorption spectroscopy Cr K-edge near edge and extended fine structure data for comparison with chemical and X-ray photoelectron spectroscopy. There was excellent agreement between the techniques in terms of identification and quantification of Cr6+ and Cr3+ species as a function of calcination temperatures between 100 and 500 degrees C.

引用

页码：168 / 175

页数：8

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