The adsorption of benzene on Pd(111) and ordered Sn/Pd(111) surface alloys

Hamm, G.; Schmidt, Timm; Breitbach, J.; Franke, D.; Becker, Conrad; Wandelt, K.

doi:10.1016/j.susc.2004.05.119

Cited by 41 publications

(26 citation statements)

References 38 publications

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“…This mode is slightly shifted to 87 meV for benzene on the Pd 3 Sn/Pd(111) surface and even more for Pd(111) (90 meV) indicating a stronger bonding. Following the theoretical results of Morin et al [62] we assign the vibration spectrum on Pd(111) to a bridge position geometry, which had already been suggested before [33]. (111) Pt (111) x 500…”

Section: Adsorption Of Benzene On Pt(111) Pd(111) and Their Surfacementioning

confidence: 78%

“…The preparation routes are similarly to the Pt-Sn cases, however, the initial tin coverage and the annealing temperatures needed are considerably different [32]. Unlike the Pd 2 Sn/Pd(111) surface alloy, which is 2-dimensional as the Pt-Sn surface alloys, the Pd 3 Sn/ Pd(111) surface alloy is not confined to the topmost substrate layer but extends into the bulk [32,33]. As a consequence the electronic structure of the Pd 3 Sn/ Pd(111) surface alloy differs quite a bit from that of the Pd 2 Sn/Pd(111) surface alloy [33].…”

Section: Model Surfacesmentioning

confidence: 99%

“…Unlike the Pd 2 Sn/Pd(111) surface alloy, which is 2-dimensional as the Pt-Sn surface alloys, the Pd 3 Sn/ Pd(111) surface alloy is not confined to the topmost substrate layer but extends into the bulk [32,33]. As a consequence the electronic structure of the Pd 3 Sn/ Pd(111) surface alloy differs quite a bit from that of the Pd 2 Sn/Pd(111) surface alloy [33]. Despite this difference to the Pt-Sn system the Pd-Sn surface alloys will be discussed as substrates for benzene adsorption.…”

Section: Model Surfacesmentioning

confidence: 99%

“…As on the Pt(111) surface the adsorption of benzene on Pd(111) is only partially reversible [33,63,64]. Coverage dependent TPD measurements show a broad peak that extends from 500 K at low coverage to 390 K at high coverage.…”

Section: Adsorption Of Benzene On Pt(111) Pd(111) and Their Surfacementioning

confidence: 99%

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Tailoring specific adsorption sites by alloying: adsorption of unsaturated organic molecules on alloy surfaces

Becker

Wandelt

2007

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Alloy surfaces can be used to control the reactivity of adsorbed molecules. We show that the adsorption of small hydrocarbons on alloy surfaces can be understood in terms of a template effect. This approach enables us to overcome the somewhat arbitrary classification of alloying effects on molecules as being due to either electronic (ligand) or geometric (ensemble) effects. By combining high-resolution electron energy loss spectroscopy and density functional theory an exact determination of the properties of the respective adsorption complex is possible.

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Section: Adsorption Of Benzene On Pt(111) Pd(111) and Their Surfacementioning

confidence: 78%

Section: Model Surfacesmentioning

confidence: 99%

Section: Model Surfacesmentioning

confidence: 99%

Section: Adsorption Of Benzene On Pt(111) Pd(111) and Their Surfacementioning

confidence: 99%

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Tailoring specific adsorption sites by alloying: adsorption of unsaturated organic molecules on alloy surfaces

Becker

Wandelt

2007

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“…Benzene and hydrogen desorption occurred in TPD of benzene adsorbed Pd. Benzene dehydrogenation in thermal desorption could take place at irreversible benzene coverage over Pd/C [30][31][32]. The strong interaction of Pd and the surface p sites of C-A and C-AN was previously shown to lead to modification of the chemical properties of Pd [33].…”

Section: Resultsmentioning

confidence: 99%

Influence of Acid Modification on Selective Phenol Hydrogenation Over Pd/Activated Carbon Catalysts

Watanabe¹,

Arunajatesan²

2010

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The influence of the acid treatment on cyclohexanone selectivity of phenol hydrogenation over Pd on active carbon was studied in liquid phase reaction and by temperature-programmed desorption. Acid treatment of activated carbon led to an increased cyclohexanone/cyclohexanol ratio. Acid modification of the carbon support enriched the electron density of Pd, and enhanced the desorption of the phenoxy species, which resulted in improved cyclohexanone selectivity in phenol hydrogenation.

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High Resolution Electron Energy‐Loss Spectroscopy

Soriaga

Chen

Ding

et al. 2005

Encyclopedia of Inorganic Chemistry

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The determination of the identity and structure of molecular species present in no more than monolayer quantities at solid surfaces is one of the more difficult tasks in interfacial science. In this regard, vibrational spectroscopy is an invaluable technique; in the evaluation of the molecular integrity of surface‐bound compounds, it has few equals. Optical methods such as infrared spectroscopy, while rather uncomplicated for bulk materials, lack the high sensitivity needed for most surface species due to minuscule molecular amounts. A much more responsive alternative is based on the use of low‐energy electrons to interact with the molecular oscillators on the surface. If inelastic interactions occur, the energy of the backscattered electrons will be lower than that of the incident electrons, and the energy loss will correspond to a vibrational‐mode frequency. The present article briefly describes the fundamental principles of and instrumental considerations in high‐resolution electron energy‐loss spectroscopy (HREELS), and cites seminal applications in the study of the adsorption of organic and inorganic molecules at metal and semiconductor surfaces. A limited list of HREELS work published since the turn of the century is added in the last section.

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The adsorption of benzene on Pd(111) and ordered Sn/Pd(111) surface alloys

Cited by 41 publications

References 38 publications

Tailoring specific adsorption sites by alloying: adsorption of unsaturated organic molecules on alloy surfaces

Tailoring specific adsorption sites by alloying: adsorption of unsaturated organic molecules on alloy surfaces

Influence of Acid Modification on Selective Phenol Hydrogenation Over Pd/Activated Carbon Catalysts

High Resolution Electron Energy‐Loss Spectroscopy

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