title: Metal-support interactions in zeolite-supported noble metals: influence of metal crystallites on the support acidity.
abstract: The metal-support interactions on a series of catalysts of different acidities, including platinum-modified zeolites and H-MCM-41, are investigated by means of XPS, CO and pyridine adsorption, and a model reaction (ring opening of decalin). The electronic properties of Pt are influenced by the acidity of the support, and the alteration of Pt properties increases with increasing acidity of the support, as can be seen from the changes in the Pt binding energy and stretching frequency of adsorbed CO. At the same time, the presence of platinum affects the acidic properties of the supports by reducing the strength of the acid sites. This is observed directly as the changes in desorption of pyridine from the acid sites and indirectly as the suppression of cracking reactions during the ring opening of decalin on the Pt-modified catalysts. The observed results are discussed in terms of the interatomic potential model.
authors.affiliation: Laboratory of Industrial Chemistry, Process Chemistry Centre, Abo Akademi University, Biskopsgatan 8, FIN-20500 Abo/Turku, Finland.
authors.forename: David
authors.initials: D
authors.lastname: Kubicka
authors.forename: Narendra
authors.initials: N
authors.lastname: Kumar
authors.forename: Tapani
authors.initials: T
authors.lastname: Venäläinen
authors.forename: Hannu
authors.initials: H
authors.lastname: Karhu
authors.forename: Iva
authors.initials: I
authors.lastname: Kubicková
authors.forename: Heidi
authors.initials: H
authors.lastname: Osterholm
authors.forename: Dmitry Yu
authors.initials: DY
authors.lastname: Murzin