Title: C-H activation of alkanes on Rh+n (n=1-30) clusters : size effects on dehydrogenation
Authors : Adlhart, Christian
Uggerud, Einar
Published in : Journal of Chemical Physics
Volume(Issue) : 123
Issue : 21
Pages : 214709
Publisher / Ed. Institution : A I P Publishing LLC
Publisher / Ed. Institution: College Park, Maryland, USA
Issue Date: 2005
Language : Englisch / English
Subjects : Catalysis; Reaction rate constants; Ion molecule reactions; Metal clusters
Subject (DDC) : 540: Chemie
Abstract: The rate coeffs. for the dehydrogenation of ethane, propane, and isobutane with cationic rhodium atoms Rh+ and clusters Rh+n of up to 30 atoms were measured under single-collision conditions in a Fourier-transform ion cyclotron resonance mass spectrometer. The reaction rates are cluster size dependent and parallel for all the three alkanes. While the reactions proceed close to the theor. collision rates for a large no. of clusters, characteristic min. are obsd. for Rh+5/6/9/19/28. The degree of dehydrogenation varies with the cluster size with maxima for 10≤n≤15 for the three alkanes and for n=3 and 2-4 in the cases of ethane and propane, resp. However, complete dehydrogenation is only obsd. for the reaction of Rh+11 with propane. Dehydrogenation is remarkably selective and no other neutral products than H2 are obsd. The results are interpreted in terms of likely cluster geometries.
Departement: Life Sciences und Facility Management
Organisational Unit: Institut für Chemie und Biotechnologie (ICBT)
Publication type: Beitrag in wissenschaftlicher Zeitschrift / Article in scientific Journal
Type of review: Peer review (Publikation)
DOI : 10.1063/1.2131066
ISSN: 0021-9606
URI: https://digitalcollection.zhaw.ch/handle/11475/2114
License (according to publishing contract) : Lizenz gemäss Verlagsvertrag / Licence according to publishing contract
Appears in Collections:Publikationen Life Sciences und Facility Management

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