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

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

Gold octamers (Au^sub 8^) bound to oxygen-vacancy F-center defects on Mg(001) are the smallest clusters to catalyze the low-temperature oxidation of CO to CO2, whereas clusters deposited on close-to-perfect magnesia surfaces remain chemically inert. Charging of the supported clusters plays a key rol...

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Veröffentlicht in:Science (American Association for the Advancement of Science) 2005-01, Vol.307 (5708), p.403
Hauptverfasser: Yoon, Bokwon, Häkkinen, Hannu, Landman, Uzi, Wörz, Anke S
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Sprache:eng
Schlagworte:
Carbon dioxide
Catalytic oxidation
Charged particles
Climate
Gold
Heat
Kinetics
Laboratory Experiments
Magnesium composites
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container_issue 5708
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container_title Science (American Association for the Advancement of Science)
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creator Yoon, Bokwon
Häkkinen, Hannu
Landman, Uzi
Wörz, Anke S
description Gold octamers (Au^sub 8^) bound to oxygen-vacancy F-center defects on Mg(001) are the smallest clusters to catalyze the low-temperature oxidation of CO to CO2, 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 O2 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. [PUBLICATION ABSTRACT]
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1095-9203
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source JSTOR Archive Collection A-Z Listing; American Association for the Advancement of Science
subjects Carbon dioxide
Catalytic oxidation
Charged particles
Climate
Gold
Heat
Kinetics
Laboratory Experiments
Magnesium composites
title Charging Effects on Bonding and Catalyzed Oxidation of CO on Au^sub 8^ Clusters on MgO
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