Support effects on hydrogen desorption, isotope exchange, chemical reactivity, and magnetism of platinum nanoclusters in KL zeolite

dc.contributor.authorJensen, Christopher
dc.contributor.authorVan Slageren, Joris
dc.contributor.authorJakes, Peter
dc.contributor.authorEichel, Rudiger A.
dc.contributor.authorRoduner, Emil
dc.date.accessioned2014-02-20T11:53:56Z
dc.date.available2014-12-01T00:20:05Z
dc.date.issued2013-11
dc.description.abstractPlatinum clusters were prepared by ion exchange of a KL zeolite, followed by oxygen calcination and hydrogen reduction, and characterized by electron paramagnetic resonance (EPR) and hyperfine sublevel correlation experiment (HYSCORE) spectroscopy. Simulations indicate that the cluster contains 12 equivalent platinum atoms. Therefore, the most likely structure is an icosahedral or cuboctahedral magic number Pt13 cluster with 12 platinum atoms at the surface. One atom in the center possesses only a small spin density. H/D desorption and readsorption experiments monitored via EPR and HYSCORE measurements provide information about the structure of the clusters and about the reversibility of the adsorption/desorption and isotope exchange process. Deuterium desorption experiments result in a value of 2.1±0.2 eV for the D2 desorption energy of the Pt13 clusters dispersed in KL zeolite. This is more than double of the value for a (111) Pt single-crystal surface, revealing a finite size and/or support effect. Oxygen adsorption on deuterium covered Pt13 clusters did not show a vigorous oxyhydrogen reaction. It appears that the reaction is inhibited by the deuterium coverage.en_US
dc.description.librarianhb2014en_US
dc.description.urihttp://pubs.acs.org/journal/jpcccken_US
dc.identifier.citationJensen, C, Van Slageren, J, Jakes, P, Eichel, RA & Roduner, E 2013, 'Support effects on hydrogen desorption, isotope exchange, chemical reactivity, and magnetism of platinum nanoclusters in KL zeolite', Journal of Physical Chemistry C, vol. 117, no. 44, pp. 22732-22745.en_US
dc.identifier.issn1932-7447 (print)
dc.identifier.issn1932-7455 (online)
dc.identifier.other10.1021/jp406303x
dc.identifier.urihttp://hdl.handle.net/2263/34147
dc.language.isoenen_US
dc.publisherAmerican Chemical Societyen_US
dc.rights© American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, vol 117, no. 44, pp. 22732-22745, 2013. doi : 10.1021/jp406303xen_US
dc.subjectPlatinum nanoclustersen_US
dc.subjectEPR spectroscopyen_US
dc.subjectCatalytic support effecten_US
dc.subjectMagnetic propertiesen_US
dc.subjectElectron paramagnetic resonance (EPR)en_US
dc.titleSupport effects on hydrogen desorption, isotope exchange, chemical reactivity, and magnetism of platinum nanoclusters in KL zeoliteen_US
dc.typePostprint Articleen_US

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