Agglomeration of supported rhodium on model catalysts

Kohl, A.; Labich, S.; Taglauer, E.; Knözinger, Helmut

doi:10.1016/s0039-6028(00)00164-3

Cited by 16 publications

(11 citation statements)

References 20 publications

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“…6 Kohl et al followed this approach in a more recent work by using again the latter system to study silica supported Rh and Rh/VO x catalysts. 7 In contrast, Mayer et al and Madey et al deposited Ni ͑Ref. 8͒ and Pt ͑Ref.…”

Section: Introductionmentioning

confidence: 92%

Morphological and electronic properties of ultrathin crystalline silica epilayers on a Mo(112) substrate

et al. 2002

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Ultrathin crystalline silica layers grown on a Mo͑112͒ substrate have been shown to be a useful silica model oxide support in surface science model catalyst studies. As the oxide support material plays an important role in the catalytic process, a multitechnique surface science study is presented to characterize the morphological and electronic properties of the heteroepitaxial system SiO 2 /Mo(112). The long-range order of the silica epilayer which grows commensurate with a c(2ϫ2) surface unit mesh on the Mo͑112͒ substrate is studied by low-energy electron diffraction ͑LEED͒. The defect structure of the silica epilayer is characterized in a spot profile analysis ͑SPA͒-LEED study. Antiphase domain boundaries split the silica epilayer into an array of silica crystal grains whose average size and shape is determined. Aiming to prepare flat silica surfaces, the change in the surface roughness with progress in the film preparation is monitored in a combined SPA-LEED and scanning tunneling microscopy ͑STM͒ study and seen to influence also the Si-O stretching frequency in the infrared-reflection-absorption spectroscopy spectra. In STM images of the final silica film an average surface roughness of about 1 Å is detected. It is possible to visualize the silica film unit cell periodicity. A combined anger electron spectroscopy and ultraviolet photoelectron spectroscopy valence band study confirms the silica film stoichiometry and the growth of a 4:2 coordinated silica polymorph on the Mo͑112͒ surface. These various surface science studies allow us to propose models for the growth and structure of the silica epilayer on the Mo͑112͒ surface.

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Section: Introductionmentioning

confidence: 92%

Morphological and electronic properties of ultrathin crystalline silica epilayers on a Mo(112) substrate

et al. 2002

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“…The kinetic energy distribution of the scattered ions is measured, and the features of the energy spectrum correspond to different atomic masses in the uppermost atomic layer. Hence, the technique allows elemental analysis, and has been used for discerning the surface composition of a number of catalysts [28,29].…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Cobalt/Rhenium Systems: Preferred Position of Rhenium Through an Interdisciplinary Approach

et al. 2010

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Some commercial type Fischer-Tropsch catalysts are based on rhenium-doped cobalt. In an attempt to elucidate the preferred position of rhenium in the cobalt matrix, we have carried out experimental Low Energy Ion Scattering investigations of oxidized and reduced catalyst samples and computational DFT investigations of bimetallic Co/Re clusters. The results indicate that rhenium preferentially occupies subsurface sites, where it can coordinate to a maximum number of cobalt atoms.

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“…It is well established that the chemical properties and activities of supported metal oxide catalysts can be dramatically influenced by the nature of the carrier [7][8][9][10]. Therefore, knowledge of the local structure of the catalyst surface and insight into the factors that determine the surface structure play an important role in further development and optimization of supported metal oxide heterogeneous catalytic systems.…”

Section: Introductionmentioning

confidence: 99%

Influence of ferric oxide modification on the properties of copper oxide supported on γ-alumina

Gao

Liu

et al. 2010

Journal of Colloid and Interface Science

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Agglomeration of supported rhodium on model catalysts

Cited by 16 publications

References 20 publications

Morphological and electronic properties of ultrathin crystalline silica epilayers on a Mo(112) substrate

Morphological and electronic properties of ultrathin crystalline silica epilayers on a Mo(112) substrate

Bimetallic Cobalt/Rhenium Systems: Preferred Position of Rhenium Through an Interdisciplinary Approach

Influence of ferric oxide modification on the properties of copper oxide supported on γ-alumina

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