In Situ Scanning Tunneling Microscopy of the Dissociation of CO on Co(0001)

被引：39

作者：

Boeller, B. ^{[1
]}

Ehrensperger, M. ^{[1
]}

Wintterlin, J. ^{[1
,2
]}

机构：

[1] Univ Munich, Dept Chem, D-81377 Munich, Germany

[2] Ctr NanoSci, D-80799 Munich, Germany

来源：

ACS CATALYSIS | 2015年 / 5卷 / 11期

关键词：

Fischer-Tropsch; carbon monoxide; dissociation; Co(0001); in situ STM; XPS; SINGLE-CRYSTAL SURFACE; CARBON-MONOXIDE; COBALT CATALYSTS; TROPSCH; PRESSURE; CHEMISORPTION; ADSORPTION; ACTIVATION; REACTIVITY; MECHANISM;

D O I：

10.1021/acscatal.5b01684

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 dissociation of CO, a crucial step in the cobalt-catalyzed Fischer-Tropsch synthesis, was investigated by in situ scanning tunneling microscopy on Co(0001) at CO pressures up to 0.25 mbar and temperatures up to 493 K. A new type of surface reconstruction was observed that is formed by carbidic carbon, as shown by X-ray photoelectron spectroscopy. Using (CO)-C-13 and titrating C-13 with O-2, the surface carbon is shown to originate from CO. The results are in contrast to predictions by theoretical work. However, the dissociation rates are 3 orders of magnitude lower than the previously measured methanation rates under equivalent conditions.

引用

页码：6802 / 6806

页数：5

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