title: Adsorption and reaction of acetylene on clean and oxygen-precovered Pd(100) studied with high-resolution X-ray photoelectron spectroscopy.
abstract: We investigated the adsorption and thermal evolution of acetylene on clean Pd(100) and Pd(100) precovered with 0.25 ML oxygen. The measurements were performed in situ by fast XPS at the synchrotron radiation facility BESSY II. On Pd(100) acetylene molecularly adsorbs at 130 K. Upon heating transformation to a CCH species occurs around 390 K along with the formation of a completely dehydrogenated carbon species. On the oxygen-precovered surface partial CCH formation already occurs upon adsorption at 130 K, and the dehydrogenation temperature and the stability range of CCH are shifted to lower temperatures by ∼200 K.
authors.affiliation: Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen, Germany and Erlangen Catalysis Resource Center (ECRC), Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen, Germany.
authors.forename: O
authors.initials: O
authors.lastname: Höfert
authors.forename: M P A
authors.initials: MP
authors.lastname: Lorenz
authors.forename: R
authors.initials: R
authors.lastname: Streber
authors.forename: W
authors.initials: W
authors.lastname: Zhao
authors.forename: A
authors.initials: A
authors.lastname: Bayer
authors.forename: H-P
authors.initials: HP
authors.lastname: Steinrück
authors.forename: C
authors.initials: C
authors.lastname: Papp