Search results for: Sh.K. Shaikhutdinov

Items from 1 to 16 out of 16 results

article

Alkene chemistry on the palladium surface: nanoparticles vs single crystals

A.M. Doyle, Sh.K. Shaikhutdinov, H.-J. Freund

Journal of Catalysis > 2004 > 223 > 2 > 444-453

The adsorption of trans-2-pentene, cis-2-pentene, and 1-pentene on Pd(111) and Pd/Al ₂ O ₃ model catalysts has been studied using temperature-programmed desorption (TPD). Each molecule reacts in an identical manner on the Pd(111) surface. Three distinct molecular adsorption states are observed, which have been assigned to multilayer, π-bonded pentene and interchanging di-σ-bonded pentene/pentyl...

article

CO adsorption on oxide supported gold: from small clusters to monolayer islands and three-dimensional nanoparticles

C. Lemire, R. Meyer, Sh.K. Shaikhutdinov, H.-J. Freund

Surface Science > 2004 > 552 > 1-3 > 27-34

CO adsorption on gold vapor-deposited on a thin FeO(111) film grown on a Pt(111) has been studied with temperature programmed desorption (TPD) and infrared reflection absorption spectroscopy (IRAS). Structural characterization has been performed with scanning tunneling microscopy. Both TPD and IRAS results clearly show a particle size effect such that small Au deposits adsorb CO more strongly. This...

article

Two-dimensional growth of Pd on a thin FeO(111) film: a physical manifestation of strong metal-support interaction

R. Meyer, M. Bäumer, Sh.K. Shaikhutdinov, H.-J. Freund

Surface Science > 2003 > 546 > 2-3 > L813-L819

Nucleation and growth of palladium vapor deposited on a thin FeO(111) film grown on a Pt(111) have been studied by scanning tunneling microscopy (STM). STM data shows that Pd randomly nucleates on the oxide surface and forms two-dimensional islands at sub-monolayer coverages. Annealing to 600 K results in strong metal sintering, thus forming extended Pd(111) monolayer islands at low coverage, and...

article

On the thermal stability of metal particles supported on a thin alumina film

M. Heemeier, S. Stempel, Sh.K. Shaikhutdinov, J. Libuda, more

Surface Science > 2003 > 523 > 1-2 > 103-110

The structure of metal (Co, Rh, Pd) particles deposited on a thin alumina film grown on a NiAl(110) substrate were studied as a function of annealing temperature. The results reveal at least three processes to occur upon heating: (a) re-arrangement of metal atoms on the particle surface, (b) sintering of the particles, and (c) metal migration into the substrate. The latter process is probably mediated...

article

Size and Support Effects for CO Adsorption on Gold Model Catalysts

Sh.K. Shaikhutdinov, R. Meyer, M. Naschitzki, M. Bäumer, more

Catalysis Letters > 2003 > 86 > 4 > 211-219

CO adsorption on gold particles deposited on well-ordered alumina and iron oxide films was studied with temperature-programmed desorption. Scanning tunneling microscopy was used to provide correlative structural characterization. The results show that the adsorption of CO on gold exhibits a size effect in that small particles adsorb CO more strongly. For a given particle size (∼3 nm), CO desorption...

article

Effect of Carbon Deposits on Reactivity of Supported Pd Model Catalysts

Sh.K. Shaikhutdinov, M. Frank, M. Bäumer, S.D. Jackson, more

Catalysis Letters > 2002 > 80 > 3-4 > 115-122

Alumina-supported Pd model catalysts were prepared by Pd evaporation onto a thin alumina film grown on a NiAl(110) substrate. Adsorption and co-adsorption of ethene, CO and hydrogen on Pd/Al₂O₃/NiAl(110) covered by carbon species, formed by ethene dehydrogenation at ∼550 K, was studied by temperature programmed desorption (TPD). TPD results show that carbon deposits do not prevent adsorption but inhibit...

article

Ex situ scanning tunneling microscopy study of under-potential oxidation of a Ag(111) electrode in an alkaline electrolyte

Sh.K. Shaikhutdinov, E.R. Savinova, A. Scheybal, K. Doblhofer, more

Journal of Electroanalytical Chemistry > 2001 > 500 > 1-2 > 208 - 212

A Ag(111) single crystal electrode emersed from NaF+NaOH electrolyte (pH 11) under potential control in the interval between -0.8 V and +0.2 V vs. Hg HgO was studied by scanning tunneling microscopy (STM) in an inert atmosphere. The STM images show that the oxidation of the Ag(111) surface starts above the point of zero charge and exhibits a nucleation-growth mechanism. It starts at the steps and...

article

Ex situ scanning tunneling microscopy study of under-potential oxidation of a Ag(111) electrode in an alkaline electrolyte

Sh.K. Shaikhutdinov, E.R. Savinova, A. Scheybal, K. Doblhofer, more

Journal of Electroanalytical Chemistry > 2001 > 500 > 1-2 > 208-212

A Ag(111) single crystal electrode emersed from NaF+NaOH electrolyte (pH 11) under potential control in the interval between −0.8 V and +0.2 V vs. Hg|HgO was studied by scanning tunneling microscopy (STM) in an inert atmosphere. The STM images show that the oxidation of the Ag(111) surface starts above the point of zero charge and exhibits a nucleation-growth mechanism. It starts at the steps and...

article

Interaction of potassium with Fe3O4(111) at elevated temperatures

Sh.K Shaikhutdinov, W Weiss, R Schlögl

Applied Surface Science > 2000 > 161 > 3-4 > 497-507

The surface structures formed by the annealing of a potassium overlayer on Fe ₃ O ₄ (111) were investigated by low energy electron diffraction (LEED), Auger electron spectroscopy (AES) and scanning tunneling microscopy (STM). Annealing at 600–700°C in vacuum or 10 ⁻⁶ mbar of oxygen resulted in well-ordered surface structures depending on the amount of potassium pre-deposited...

article

Oxygen pressure dependence of the α-Fe ₂ O ₃ (0001) surface structure

Sh.K. Shaikhutdinov, W. Weiss

Surface Science > 1999 > 432 > 3 > L627-L634

The dependence of the α-Fe ₂ O ₃ (0001) hematite surface structure on ambient oxygen gas pressure was investigated with scanning tunneling microscopy and low energy electron diffraction. For this, thin epitaxial α-Fe ₂ O ₃ (0001) films grown onto a Pt(111) substrate were prepared in oxygen partial pressures between 10 ^- ⁶ and 1mbar at temperatures around...

article

Destruction of the charge density wave structure in 1T-TaS ₂ under pyridine intercalation

T.K. Kim, V.P. Babenko, B.N. Novgorodov, D.I. Kochubey, more

Nuclear Inst. and Methods in Physics Research, A > 1998 > 405 > 2-3 > 348-350

XANES data for 1T- and 2H-TaS ₂ were obtained for L _I _I _I and L _I _I a edges. The changes of the electron density in that were determined after pyridine intercalation.

article

Carbon on the Pt(110) surface: a scanning tunneling microscopy study

Sh.K. Shaikhutdinov, A.I. Boronin, R.I. Kvon

Surface Science > 1997 > 382 > 1-3 > 187-192

Carbon on the Pt(110) surface is investigated by STM, AES and XPS. The data show that carbide-like carbon is formed by surface segregation. If produced, carbon ad-atoms are found to be located at the near-top site on the Pt(110)-(1 1) surface. STM images of the carbon overlayer, deposited by ethylene decomposition at 1150 K, show no three-dimensional graphitic islands, but rather a reconstructed...

article

Nickel catalysts supported on carbon nanofibers: structure and activity in methane decomposition

Sh.K. Shaikhutdinov, L.B. Avdeeva, B.N. Novgorodov, V.I. Zaikovskii, more

Catalysis Letters > 1997 > 47 > 1 > 35-42

Structures of Ni catalysts supported on filamentous carbon (CFC) produced by methane decomposition over coprecipitated Ni and Ni-Cu/alumina catalysts were studied by EXAFS and TEM. Thermal pre-treatment in N₂ at 350°C of samples impregnated by nickel nitrate precursor was found to produce either NiO or nickel carbide, Ni₃C, phase. This was explained by different reducing properties of the carbon nanofibers...

article

Coprecipitated Ni-alumina and Ni-Cu-alumina catalysts of methane decomposition and carbon deposition III. Morphology and surface structure of the carbon filaments

V.I. Zaikovskii, L.B. Avdeeva, Sh.K. Shaikhutdinov

Applied Catalysis A, General > 1996 > 148 > 1 > 123-133

Filamentous carbons produced by the coprecipitated Ni-alumina and Ni-Cu-alumina catalysts of methane decomposition were studied with high resolution transmission electron microscopy and scanning tunneling microscopy. Graphite layers were found to orient at an angle to the filament axis in carbon prepared by Ni catalysts, and perpendicular to the axis in those deposited on Ni-Cu catalysts. In both...

article

Electrochemical Deposition of Platinum Hydrosol on Graphite Observed by Scanning Tunneling Microscopy

Sh.K. Shaikhutdinov, F.A. Möller, G. Mestl, R.J. Behm

Journal of Catalysis > 1996 > 163 > 2 > 492-495

article

Coprecipitated Ni-alumina and Ni-Cu-alumina catalysts of methane decomposition and carbon deposition. II. Evolution of the catalysts in reaction

Sh.K. Shaikhutdinov, L.B. Avdeeva, O.V. Goncharova, D.I. Kochubey, more

Applied Catalysis A, General > 1996 > 141 > 1-2 > 117-129

Using coprecipitated Ni-alumina and Ni-Cu-alumina catalysts, up to 250 g/g _c _a _t of filamentous carbon was produced by methane decomposition at 823 K and a methane pressure of 100 kPa. The process evolved three general stages. In the induction period carbon was dissolved into the Ni particles as evidenced by in situ X-ray powder diffraction measurements. This promoted the formation...

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