CO Hydrogenation: Exploring Iridium as a Promoter for Supported Cobalt Catalysts by TPR-EXAFS/XANES and Reaction Testing

被引：22

作者：

Cronauer, Donald C. ^{[2
]}

Jacobs, Gary ^{[1
]}

Linganiso, Linda ^{[1
]}

Kropf, A. Jeremy ^{[2
]}

Elam, Jeffrey W. ^{[2
]}

Christensen, Steven T. ^{[2
]}

Marshall, Christopher L. ^{[2
]}

Davis, Burtron H. ^{[1
]}

机构：

[1] Univ Kentucky, Ctr Appl Energy Res, Lexington, KY 40511 USA

[2] Argonne Natl Lab, Argonne, IL 60439 USA

来源：

CATALYSIS LETTERS | 2011年 / 141卷 / 07期

关键词：

Cobalt; Iridium; Alumina; Incipient wetness impregnation; Atomic layer deposition; TPR; EXAFS; XANES; FISCHER-TROPSCH SYNTHESIS; IN-SITU EXAFS; L-III EDGES; CO/AL2O3; CATALYSTS; REDUCTION PROPERTY; REDUCIBILITY;

D O I：

10.1007/s10562-011-0620-4

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 price of iridium currently trends at about half the cost of platinum, the latter being a typical reduction promoter for Co/Al2O3 Fischer-Tropsch (FT) synthesis catalysts in gas-to-liquids (GTL) technology. In the current contribution, both fixed-bed catalytic FT and TPR-EXAFS/XANES experiments were carried out over 0.1% iridium-doped 25% Co/Al2O3 catalysts in order to (1) assess the effectiveness of Ir as a promoter of cobalt oxide reduction and (2) evaluate the effectiveness of the incipient wetness impregnation (IWI) technique for adding the Ir precursor by comparing a catalyst prepared by IWI to one prepared by atomic layer deposition (ALD). Ir was demonstrated to be an effective promoter for facilitating the second step of cobalt oxide reduction, CoO to Co-0, and the IWI method was found to be superior to ALD.

引用

页码：968 / 976

页数：9

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