Local and long range order in promoted iron-based Fischer-Tropsch catalysts: A combined in situ X-ray absorption spectroscopy/wide angle X-ray

被引：159

作者：

de Smit, Emiel ^{[1
]}

Beale, Andrew M. ^{[1
]}

Nikitenko, Sergey ^{[2
]}

Weckhuysen, Bert M. ^{[1
]}

机构：

[1] Univ Utrecht, Debye Inst Nanomat Sci, NL-3584 CA Utrecht, Netherlands

[2] European Synchrotron Radiat Facil, DUBBLE, Netherlands Org Sci Res NWO, F-38043 Grenoble 9, France

来源：

JOURNAL OF CATALYSIS | 2009年 / 262卷 / 02期

关键词：

Fischer-Tropsch synthesis; Iron; Catalyst promotion; In situ; XAFS; WAXS; SUPPORTED FE CATALYSTS; MOSSBAUER-SPECTROSCOPY; REDUCTION BEHAVIOR; WORKING CATALYST; ANOMALOUS WATER; ACTIVATION; CARBON; CARBIDE; SILICA; DIFFRACTION;

D O I：

10.1016/j.jcat.2008.12.021

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 structural properties of three Fe-based Fischer-Tropsch synthesis (FTS) catalysts containing different amounts of Cu, K and SiO2 additives were investigated during pretreatment and FTS in a fixed bed-like reactor using combined in situ X-ray absorption fine structure (XAFS)/wide angle X-ray scattering (WARS) techniques. This combination enabled acquisition of complementary information regarding the local environment of iron atoms from XAFS and crystalline phases from WAXS during H-2 and CO/H-2 pretreatment and FTS at 1 bar. The presence of the SiO2 support and promoter elements significantly influenced the structural properties of the catalysts after pretreatment. After FTS, H-2 pretreated catalysts mainly consisted of amorphous theta-Fe3C clusters (unsupported catalysts) or amorphous iron (II) silicate (supported catalyst), while the CO/H-2 pretreated catalysts all consisted mainly of gamma-Fe and chi-Fe5C2. Catalysts activated in CO/H-2 showed superior stability and activity, while H-2 pretreated unsupported catalysts deactivated rapidly during the first 15 h of FTS. (C) 2009 Elsevier Inc. All rights reserved.

引用

页码：244 / 256

页数：13

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