Ultrathin epitaxial deposits of platinum of NaCl to be used as model catalysts

Gehrer, Eugen; Hayek, K.

doi:10.1016/0040-6090(84)90091-9

Cited by 10 publications

(1 citation statement)

References 11 publications

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“…47 However, good lattice fit and proper surface preparation appear to be most important for the display of bulk-like properties in the film after deposition of only monolayer concentrations. 46 An empirical treatment of the epitaxial growth mode of metals on metals based on geometrical considerations is given by Bauer.49 We examined Pd thin films on a variety of support materials like MgO, quartz, sapphire, mica, CaF2, and W foil. 60 The most promising results were obtained with the Pd/W film.…”

Section: Catalyst Designmentioning

confidence: 99%

Rational design of a heterogeneous palladium catalyst for the selective hydrogenation of alkynes

Ulan¹,

Maier²,

Smith³

1987

J. Org. Chem.

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terium chemisorption. The catalysts were prereduced in D2 for 3-4 h at room temperature in a standard gas titration apparatus. They were then evacuated under vacuum (1CT1 234 mbar) overnight at 270 °C to yield the zero-valent clean metal surface. Deuterium was chosen over hydrogen to avoid the ,3-hydride phase formation and the deuterium titrations were performed with the catalyst heated to 100 °C as a further measure to avoid deuterium absorption in to the Pd bulk.24 Electron Microscopy Studies. The powdered Pd/CaC03 catalysts were crushed by an agate mortar and dispersed into suspension by shaking in ethanol. A drop of suspension was placed on a holey-carbon grid and allowed to dry. These specimens were examined in a JEOL JEM-200CX high resolution as well as in an analytical transmission electron microscope.Auger Electron Spectroscopy. The Auger electron spectroscopic studies were obtained from the Charles Evans & Associates Materials Characterization Laboratories in Redwood City.General Hydrogenation Procedure. Hydrogenations were carried out at ambient conditions in a three-necked round-bottom flask connected to a hydrogen reservoir maintained at normal pressure. The catalysts were placed in the flask and flushed (24) Benson,

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Section: Catalyst Designmentioning

confidence: 99%

Rational design of a heterogeneous palladium catalyst for the selective hydrogenation of alkynes

Ulan¹,

Maier²,

Smith³

1987

J. Org. Chem.

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Model Systems

Ribeiro

Somorjai

Wedler³

et al. 1997

Handbook of Heterogeneous Catalysis

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Epitaxial noble metal particles upon oxidation and reduction. A model system for supported metal catalysts

Rupprechter

Seeber

Hayek

et al. 1994

Phys. Stat. Sol. (a)

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Small particles of Pt, Rh, and Ir, epitaxially grown on NaCl substrates and subsequently embedded in Al2O3 or TiO2, provide a suitable model for supported metal catalysts. Owing to the regular as‐grown particle shapes, examined by high resolution electron microscopy, weak‐beam dark‐field imaging, and selected‐area electron diffraction, these films are in particular suited to study structural and morphological changes occurring during the catalyst activation pretreatment. These changes strongly depend on the as‐deposited film structure. While only slightly established at isolated particles, e.g. by microfaceting, they seriously alter by coalescence and spreading the catalyst structure and performance at closely neighboured particles.

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Ultrathin epitaxial deposits of platinum of NaCl to be used as model catalysts

Cited by 10 publications

References 11 publications

Rational design of a heterogeneous palladium catalyst for the selective hydrogenation of alkynes

Rational design of a heterogeneous palladium catalyst for the selective hydrogenation of alkynes

Model Systems

Epitaxial noble metal particles upon oxidation and reduction. A model system for supported metal catalysts

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