Document Detail


Selective oxidation with dioxygen by gold nanoparticle catalysts derived from 55-atom clusters.
MedLine Citation:
PMID:  18719586     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Supported gold nanoparticles have excited much interest owing to their unusual and somewhat unexpected catalytic properties, but the origin of the catalytic activity is still not fully understood. Experimental work on gold particles supported on a titanium dioxide (110) single-crystal surface has established a striking size threshold effect associated with a metal-to-insulator transition, with gold particles catalytically active only if their diameters fall below approximately 3.5 nm. However, the remarkable catalytic behaviour might also in part arise from strong electronic interaction between the gold and the titanium dioxide support. In the case of industrially important selective oxidation reactions, explanation of the effectiveness of gold nanoparticle catalysts is complicated by the need for additives to drive the reaction, and/or the presence of strong support interactions and incomplete understanding of their possible catalytic role. Here we show that very small gold entities ( approximately 1.4 nm) derived from 55-atom gold clusters and supported on inert materials are efficient and robust catalysts for the selective oxidation of styrene by dioxygen. We find a sharp size threshold in catalytic activity, in that particles with diameters of approximately 2 nm and above are completely inactive. Our observations suggest that catalytic activity arises from the altered electronic structure intrinsic to small gold nanoparticles, and that the use of 55-atom gold clusters may prove a viable route to the synthesis of robust gold catalysts suited to practical application.
Authors:
Mark Turner; Vladimir B Golovko; Owain P H Vaughan; Pavel Abdulkin; Angel Berenguer-Murcia; Mintcho S Tikhov; Brian F G Johnson; Richard M Lambert
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Nature     Volume:  454     ISSN:  1476-4687     ISO Abbreviation:  Nature     Publication Date:  2008 Aug 
Date Detail:
Created Date:  2008-08-22     Completed Date:  2008-09-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  England    
Other Details:
Languages:  eng     Pagination:  981-3     Citation Subset:  -    
Affiliation:
Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK.
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Comment In:
Nature. 2008 Aug 21;454(7207):948-9   [PMID:  18719574 ]

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