Charging Effects on Bonding and Catalyzed Oxidation of CO on Au 8 Clusters on MgO-Reference-Cited by-同舟云学术

Charging Effects on Bonding and Catalyzed Oxidation of CO on Au 8 Clusters on MgO

Published:2005-01-21 Issue:5708 Volume:307 Page:403-407
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Yoon Bokwon¹²,Häkkinen Hannu¹²,Landman Uzi¹²,Wörz Anke S.¹²,Antonietti Jean-Marie¹²,Abbet Stéphane¹²,Judai Ken¹²,Heiz Ueli¹²

Affiliation:

1. School of Physics, Georgia Institute of Technology, Atlanta, GA 30332–0430, USA.

2. Departement Chemie, Lehrstuhl für Physikalische Chemie I, Technische Universität München, Lichtenbergstraße 4, 85747 Garching, Germany.

Abstract

Gold octamers (Au 8 ) bound to oxygen-vacancy F-center defects on Mg(001) are the smallest clusters to catalyze the low-temperature oxidation of CO to CO 2 , whereas clusters deposited on close-to-perfect magnesia surfaces remain chemically inert. Charging of the supported clusters plays a key role in promoting their chemical activity. Infrared measurements of the stretch vibration of CO adsorbed on mass-selected gold octamers soft-landed on MgO(001) with coadsorbed O 2 show a red shift on an F-center–rich surface with respect to the perfect surface. The experiments agree with quantum ab initio calculations that predict that a red shift of the C–O vibration should arise via electron back-donation to the CO antibonding orbital.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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