Adsorption on oxide surfaces: structure and dynamics

Winkelmann, F.C.; Wohlrab, Sebastian; Libuda, Jörg; Bäumer, Marcus; Cappus, D.; Menges, M.; Al‐Shamery, Katharina; Kuhlenbeck, Helmut; Freund, Hans‐Joachim

doi:10.1016/0039-6028(94)91556-3

Cited by 68 publications

(19 citation statements)

References 20 publications

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“…A comparison with preceding studies for Pt on the same substrate [5] demonstrates that the particle substrate interaction being different for both cases can playa significant role for the adsorption behaviour.…”

Section: Introductionmentioning

confidence: 92%

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The Growth and Properties of Pd and Pt on Al₂O₃/NiAl(110)

Bäumer

Libuda

Sandell

et al. 1995

Ber Bunsenges Phys Chem

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Small metal particles have strongly size-dependent properties, which -in the case of supported particles -are also influenced by the particle substrate interaction. We have investigated such effects for Pd deposited on a thin alumina film grown on NiAl(11 0) by probing the adsorption behaviour of CO. Structure and size of the metal islands were varied by employing different substrate temperatures during evaporation. We found that at 90 K small, disordered aggregates are formed, whereas deposition at 300 K results in larger crystallites with (111) facets. The CO thermal desorption spectra show a size-dependent behaviour which can be attributed to a higher degree of CO coordination with decreasing particle size. The results are compared with the corresponding behaviour of Pt. In contrast to Pd, Pt leads to a strong interaction with the substrate at 300 K. This gives rise to a desorption feature of CO in a temperature range which is typical for transition metal oxides.

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Section: Introductionmentioning

confidence: 92%

“…Since growth and adsorption properties of Pt on the alumina film have been described in detail elsewhere [5], a short summary is sufficient within the scope of this paper. It will demonstrate that the situation for Pt differs from the behaviour of Pd:…”

Section: Deposition Of Ptmentioning

confidence: 99%

The Growth and Properties of Pd and Pt on Al₂O₃/NiAl(110)

Bäumer

Libuda

Sandell

et al. 1995

Ber Bunsenges Phys Chem

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“…Adsorption on defect-free oxides is generally weak given the high degree of bond saturation at their surface and the large gap that governs their electronic structure [12][13][14][15][16][17][18]. Metal atoms deposited onto pristine oxides have essentially two means to interact with the surface.…”

Section: General Considerationsmentioning

confidence: 99%

Model Catalysts Based on Au Clusters and Nanoparticles

Nilius

Risse

Shaikhutdinov

et al. 2013

Structure and Bonding

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Small Au particles have been shown to exhibit interesting catalytic properties. In an attempt to parallel catalytic studies on powder supports we have undertaken a series of model studies using oxide films as support. We address the formation of Au aggregates as a function of size starting from Au atoms to clusters and islands of larger size and as a function of the support. In addition we have studied different support materials such as alumina and iron oxide and we compare ultrathin and thicker oxide films of the same material (MgO). From a comparison of charge transfer through ultrathin films with the situation encountered in thicker films, we propose the use of dopants in bulk materials to control particle shape.We include the study of carbon monoxide adsorption on Au clusters of varying size. It is demonstrated how chemical modification (hydroxylation) of oxide supports influence particle growth and properties. Finally, we report on effects to study the processes involved in particle growth by wet impregnation in order to bridge the gap to catalyst preparation under realistic conditions. On that basis one may now compare properties of supported particles prepared in ultrahigh vacuum using physical vapor deposition with those prepared by wet impregnation

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“…Adsorption on defect-free oxides is generally weak given the high degree of bond saturation at their surface and the large gap, in particular, that governs their electronic structure [14,15,24,26,31,38,44,45,[52][53][54]58]. Metal atoms deposited onto pristine oxides have essentially two means to interact with the surface [58].…”

Section: Introductionmentioning

confidence: 99%

Oxygen activation on oxide surfaces: A perspective at the atomic level

Freund

2014

Catalysis Today

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a b s t r a c tThin oxide films have been used as model supports to unravel the influence of the oxide-metal and oxide-gas interface. We discuss the influence of defects in the oxide lattice and the oxide surface on properties of adsorbed species, in particular the formation of oxide particles from a deposited transition metal onto ceria and of adsorbed oxygen from the gas phase. Here we correlate the structure of the particles, as revealed by a combination of STM and spectroscopic as well as theoretical calculations, with their reactive properties. The nature of the involved defects is characterized by adsorption of Au as a way to correlate the influence of various defects of different structure on the Au charge state. In a second case study, we demonstrate the influence of dopants within the supporting oxide on the adsorption of oxygen on a defect free surface. This is shown to be potentially relevant for the activation of methane in oxidative methane coupling reactions, as recently demonstrated.

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Adsorption on oxide surfaces: structure and dynamics

Cited by 68 publications

References 20 publications

The Growth and Properties of Pd and Pt on Al₂O₃/NiAl(110)

The Growth and Properties of Pd and Pt on Al₂O₃/NiAl(110)

Model Catalysts Based on Au Clusters and Nanoparticles

Oxygen activation on oxide surfaces: A perspective at the atomic level

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Adsorption on oxide surfaces: structure and dynamics

Cited by 68 publications

References 20 publications

The Growth and Properties of Pd and Pt on Al2O3/NiAl(110)

The Growth and Properties of Pd and Pt on Al2O3/NiAl(110)

Model Catalysts Based on Au Clusters and Nanoparticles

Oxygen activation on oxide surfaces: A perspective at the atomic level

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The Growth and Properties of Pd and Pt on Al₂O₃/NiAl(110)

The Growth and Properties of Pd and Pt on Al₂O₃/NiAl(110)