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

Journal of the American Chemical Society
Jeongjin KimJeong Young Park

Abstract

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.

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Citations

Jun 8, 2017·Chemical Society Reviews·Matthijs A van SpronsenIrene M N Groot
Mar 31, 2017·Chemical Society Reviews·Jian DouFranklin Feng Tao
Nov 7, 2018·Nature Communications·Jun LiDavid Sinton
Nov 8, 2018·The Review of Scientific Instruments·Joong Il Jake ChoiJeong Young Park
Dec 9, 2020·Chemical Reviews·Miquel Salmeron, Baran Eren

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