title: Influence of Sn content on the hydrogenation of crotonaldehyde catalysed by colloidally prepared PtSn nanoparticles.
abstract: Bimetallic PtSn nanoparticles (NPs) of well-defined size and metal composition were prepared by means of colloidal methods. The mean particle diameter was about 2 nm for all samples irrespective of the Pt/Sn-ratio, which enables a systematic study of the influence of the composition on the catalytic properties while excluding particle size effects. The hydrogenation of crotonaldehyde was investigated as a reaction for which chemoselectivity is known to be a challenging task. Already very low atomic Sn contents (≈10%) were found to lead to a significantly improved activity which may be attributed to an electronic effect of Sn on Pt. For further increasing tin contents the activity decreased gradually. This trend was accompanied by a steady increase in selectivity towards the desired product (crotylalcohol). The results show that the highest crotylalcohol time yields can be obtained by using catalysts with an atomic Sn content of approximately 23%. In contrast, maximum crotylalcohol selectivities are achieved by using catalysts with a high tin content (>50%).
authors.affiliation: Institute of Applied and Physical Chemistry and Center for Environmental Research and Sustainable Technology, University of Bremen Leobener Str. UFT, D-28359 Bremen, Germany. SebKunz@Uni-Bremen.de.
authors.forename: Lena
authors.initials: L
authors.lastname: Altmann
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Wang
authors.forename: Holger
authors.initials: H
authors.lastname: Borchert
authors.forename: Joanna
authors.initials: J
authors.lastname: Kolny-Olesiak
authors.forename: Volkmar
authors.initials: V
authors.lastname: Zielasek
authors.forename: Jürgen
authors.initials: J
authors.lastname: Parisi
authors.forename: Sebastian
authors.initials: S
authors.lastname: Kunz
authors.forename: Marcus
authors.initials: M
authors.lastname: Bäumer
mesh_terms: D000447:Aldehydes / Q000737:chemistry*; D002384:Catalysis; D003102:Colloids / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*; D014001:Tin / Q000032:analysis* / Q000737:chemistry*
chemical_list: D000447:Aldehydes; D003102:Colloids; D010984:Platinum; D014001:Tin; D006859:Hydrogen; C012796:2-butenal