In situ high-pressure high-temperature scanning tunneling microscopy of a Co(0001) Fischer-Tropsch model catalyst

被引：38
作者：
Ehrensperger, Martin [1 ]
Wintterlin, Joost [1 ,2 ]
机构：
[1] Univ Munich, Dept Chem, D-81377 Munich, Germany
[2] Ctr NanoSci, D-80799 Munich, Germany
来源：
JOURNAL OF CATALYSIS | 2014年 / 319卷
关键词：
Cobalt; Fischer-Tropsch; High-pressure STM; In situ STM; Methanation; Model catalyst; Scanning tunneling microscopy; Single crystal; Surface science; XPS; SUPPORTED COBALT CATALYSTS; CARBON-MONOXIDE; CO HYDROGENATION; HETEROGENEOUS CATALYSIS; STRUCTURE SENSITIVITY; SURFACE SCIENCE; CHEMISORPTION; ADSORPTION; DECOMPOSITION; PHOTOEMISSION;
D O I：
10.1016/j.jcat.2014.09.011
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 Fischer-Tropsch synthesis of hydrocarbons from carbon monoxide and hydrogen over cobalt catalysts is expected to become the key method for the future production of liquid fuels. Despite decades of research on the reaction mechanism, the state of the surface of the operating catalyst is still uncertain. Using in situ high-temperature high-pressure scanning tunneling microscopy, we have investigated the Fischer-Tropsch reaction over a Co(0001) single crystal model catalyst in the methanation limit. Atomically resolved images show that the surface does not transform into an oxide or carbide, but remains metallic under reaction conditions. The data are consistent with a mobile layer of reversibly adsorbed particles on the surface. The surface morphology under reaction conditions is unchanged from the surface in ultra-high vacuum. Widespread assumptions about a surface restructuring that seemed to explain the activity of cobalt-based Fischer-Tropsch catalysts are not confirmed. (C) 2014 Elsevier Inc. All rights reserved.
引用
收藏
页码：274 / 282
页数：9
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