title: Ionic liquid based model catalysis: interaction of [BMIM][Tf2N] with Pd nanoparticles supported on an ordered alumina film.
abstract: Towards a better understanding of novel catalytic materials consisting of supported noble metal catalysts modified by an ionic liquid (IL) film, we have performed a study under ultrahigh-vacuum (UHV) conditions. The model surface consists of Pd nanoparticles grown in UHV on an ordered alumina film on NiAl(110). Thin films of the room temperature IL 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [BMIM][Tf(2)N] are deposited onto this surface by means of physical vapor deposition (PVD). The interaction of the IL with clean and CO-covered Pd/Al(2)O(3)/NiAl(110) at 300 K and the thermal behavior of the deposited IL films on Pd/Al(2)O(3)/NiAl(110) are investigated by time-resolved infrared reflection absorption spectroscopy (TR-IRAS) and X-ray photoelectron spectroscopy (XPS). At 300 K, the IL adsorbs molecularly both onto the Pd particles and onto the alumina. The IR spectra suggest that the [Tf(2)N](-) anions interact with Pd sites preferentially via the sulfonyl groups. CO pre-adsorbed on the Pd particles is partially displaced by the IL, even at 300 K, and only the part of CO adsorbed onto hollow sites on (111) facets of the Pd particles remains in place. Upon heating to temperatures higher than the desorption temperature of the IL (>400 K), molecular desorption of the IL competes with decomposition. The decomposition products, atomic species and small fragments, remain preferentially adsorbed onto the Pd nanoparticles and strongly modify their surface properties. Most of the decomposition products originate from the [BMIM](+) cations, whereas the [Tf(2)N](-) anions desorb for the most part.
authors.affiliation: Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstrasse 3, D-91058 Erlangen, Germany.
authors.forename: Marek
authors.initials: M
authors.lastname: Sobota
authors.forename: Martin
authors.initials: M
authors.lastname: Schmid
authors.forename: Markus
authors.initials: M
authors.lastname: Happel
authors.forename: Max
authors.initials: M
authors.lastname: Amende
authors.forename: Florian
authors.initials: F
authors.lastname: Maier
authors.forename: Hans-Peter
authors.initials: HP
authors.lastname: Steinrück
authors.forename: Natalia
authors.initials: N
authors.lastname: Paape
authors.forename: Peter
authors.initials: P
authors.lastname: Wasserscheid
authors.forename: Mathias
authors.initials: M
authors.lastname: Laurin
authors.forename: J Michael
authors.initials: JM
authors.lastname: Gottfried
authors.forename: Jörg
authors.initials: J
authors.lastname: Libuda