Thermal Evolution and Instability of CO-Induced Platinum Clusters on the Pt(557) Surface at Ambient Pressure

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Carbon monoxide (CO) is one of the most-studied molecules among the many modern industrial chemical reactions available. Following the Langmuir-Hinshelwood mechanism, CO conversion starts with adsorption on a catalyst surface, which is a crucially important stage in the kinetics of the catalytic reaction. Stepped surfaces show enhanced catalytic activity because they,. by nature, have dense active sites. Recently, it was found that surface-sensitive adsorption of CO is strongly related to surface restructuring via roughening of a stepped surface. In this scanning tunneling microscopy study, we observed the thermal evolution of surface restructuring on a representative stepped platinum catalyst, Pt(557). CO adsorption at 1.4 mbar CO causes the formation of a broken-step morphology, as well as CO induced triangular Pt clusters that exhibit a reversible disordered ordered transition. Thermal instability of the CO-induced platinum clusters on the stepped surface was observed, which is associated with the reorganization of the repulsive CO CO interactions at elevated temperature.
Publisher
AMER CHEMICAL SOC
Issue Date
2016-02
Language
English
Article Type
Article
Keywords

SCANNING-TUNNELING-MICROSCOPY; STRUCTURE SENSITIVITY; METAL-SURFACES; PT(111); DISSOCIATION; SPECTROSCOPY; TEMPERATURE; ADSORPTION; OXIDATION; SCIENCE

Citation

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.138, no.4, pp.1110 - 1113

ISSN
0002-7863
DOI
10.1021/jacs.5b10628
URI
http://hdl.handle.net/10203/207641
Appears in Collection
EEW-Journal Papers(저널논문)
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