Interaction of oxygen with palladium deposited on a thin alumina film

Shaikhutdinov, Sh.K.; Heemeier, M.; Hoffmann, Jens; Meusel, Ingo; Richter, B.; Bäumer, Marcus; Kuhlenbeck, Helmut; Libuda, Jörg; Freund, Hans‐Joachim; Oldman, R. J.; Jackson, S. David; Konvicka, C.; Schmid, Michael; Варга, П.

doi:10.1016/s0039-6028(01)01850-7

Cited by 117 publications

(112 citation statements)

References 30 publications

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“…4). This procedure is similar to that previously used for the Pd/Al 2 O 3 /NiAl(110) system [38,39], and practically recovers the original CO TPD spectra and cleanliness of the Pt surfaces as judged by AES.…”

Section: Resultssupporting

confidence: 52%

CO adsorption and dissociation on iron oxide supported Pt particles

et al. 2009

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Abstract. We studied CO adsorption on Pt part icles deposited on well-ordered Fe3O4 (111) thin films grown on Pt(111) by temperature programmed desorption (TPD). A highly stepped Pt(111) surface produced by ion sputter ing and annealing at 600 K was studied for comparison. Structural characterization was performed by scanning tunneling microscopy and Auger electron spectroscopy. The TPD spectra revealed that in addition to the desorption peaks at ~ 400 and ~ 480 K, assigned to CO adsorbed on Pt(111) facets and low -coordination sites respectively, the Pt nanoparticles annealed at 600 K exhibit a desorption state at ~ 270 K.This state is assigned to initial stages of strong metal-support interaction resulting in partial Fe-Pt intermixing. On both Pt/Fe 3 O 4 (111) and stepped Pt(111) surfaces CO is found to dissociate at 500 K. The results suggest that CO dissociation and carbon accumulation occur on the low-coordinated Pt sites.

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Section: Resultssupporting

confidence: 52%

CO adsorption and dissociation on iron oxide supported Pt particles

et al. 2009

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“…In addition, previous studies on the oxygen interaction with alumina supported particles showed that the metal particles may promote thickening of the alumina film via oxygen dissociation and subsequent diffusion of atomic oxygen to the alumina/NiAl interface [35,36]. This in turn may also alter the interaction of the niobia particles and the alumina film.…”

Section: Methodsmentioning

confidence: 96%

Preparation and structure of alumina supported niobia model catalysts

et al. 2007

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Abstract.Niobia/alumina model catalysts were prepared by physical vapor deposition of Nb in an oxygen atmosphere onto thin alumina films. Structural characterization, performed with scanning tunneling microscopy and infrared reflection absorption spectroscopy, revealed highly dispersed N 2 O 5 nanoparticles exposing Nb=O groups. Thermal stability of the system was also examined. The results are compared with those obtained on thin niobia films and previously studied vanadia/alumina systems.

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“…The metals were deposited onto alumina at ~ 90 K. The samples were then oxidized for ~10 min in 10 -6 mbar of O 2 at 500 K, reduced by CO at 300 K and flashed to 600 K. This procedure has been shown to prevent Pd from diffusing into the oxide film [32] and in addition resembles calcinations-reduction treatments of real catalysts.…”

Section: Methodsmentioning

confidence: 99%

Acetylene and Ethylene Hydrogenation on Alumina Supported Pd-Ag Model Catalysts

2006

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Adsorption and co-adsorption of ethylene, acetylene and hydrogen on Pd-Ag particles, supported on thin alumina films, have been studied by temperature programmed desorption (TPD). The TPD results show that adding of Ag to Pd suppresses overall hydrogenat ion activity but increases selectivity towards ethylene, i.e. similar to that observed on real catalysts. The results are rationalized on the basis of a complex interplay between surface and subsurface hydrogen species available in the system, whereby the latter species are the most critical for total hydrogenation of acetylene to ethane.

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Interaction of oxygen with palladium deposited on a thin alumina film

Cited by 117 publications

References 30 publications

CO adsorption and dissociation on iron oxide supported Pt particles

CO adsorption and dissociation on iron oxide supported Pt particles

Preparation and structure of alumina supported niobia model catalysts

Acetylene and Ethylene Hydrogenation on Alumina Supported Pd-Ag Model Catalysts

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