O. Boese

Solvay (Germany)

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Erhard Kemnitz

Humboldt-Universität zu Berlin

Sven L. M. Schroeder

Diamond Light Source

Wolfgang E. S. Unger

Federal Institute For Materials Research and Testing

Norbert Weiher

University of Manchester

Andreas Lippitz

Federal Institute For Materials Research and Testing

S.I. Troyanov

Lomonosov Moscow State University

B. Adamczyk

Silesian University of Technology

Cooperative Institutions

Humboldt-Universität zu Berlin

University of Manchester

Diamond Light Source

Federal Institute For Materials Research and Testing

Lomonosov Moscow State University

Humboldt State University

University of Leeds

Jožef Stefan Institute

Daresbury Laboratory

Laboratoire de Réactivité de Surface

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Active sites on an oxide catalyst for F/Cl-exchange reactions: X-ray spectroscopy of fluorinated γ-Al2O3

Physical Chemistry Chemical Physics (2002)

O. Boese Wolfgang E. S. Unger Erhard Kemnitz Sven L. M. Schroeder

The dismutation of CHClF2 to CHF3 and CHCl3 was used to probe the effect of γ-Al2O3 fluorination on fluorine-against-chlorine (Cl/F) exchange reactions. X-ray photoelectron spectroscopy (XPS), X-ray excited Auger electron spectroscopy (XAES) and X-ray absorption near edge structure (XANES) spectroscopy were employed to probe the modifications at the surface of γ-Al2O3 accompanying the initial stages of fluorination. The results suggest that fluorine uptake by γ-Al2O3 starts initially at the surface of the oxide particles, with the formation of a fluorine species that is characterised by a single bond and a high effective charge q. Catalytic Cl/F-exchange is only observed after accumulation of higher fluorine concentrations, for which insertion of fluorine into the sub-surface region of the oxide crystallites has commenced. Quantitative XPS shows that the fluorination level must exceed approximately 10 atom% of the anions to achieve catalytic activity. The spectroscopic evidence suggests that the formation of aluminium oxofluorides is sufficient to provide catalytic activity. The presence of an AlF3 phase is not a condition for the observation of catalytic activity, even though defect-rich AlF3 is ultimately the endpoint of the fluorination process and is itself a Cl/F exchange catalyst.

Fluorine

Auger electron spectroscopy

XANES

Aluminium oxides

X-ray absorption spectroscopy

10.1039/b110792e

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Citations (43)

CCDC 195657: Experimental Crystal Structure Determination

The Cambridge Structural Database (2003)

O. Boese S.I. Troyanov Erhard Kemnitz

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/cc6kljv

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Crystal Structure of a New Dimethyl Carbonate/2,4,6-Tris(trifluoromethyl)- 1,3,5-triazine 1:1 Adduct

Zeitschrift für Naturforschung B (2003)

O. Boese S.I. Troyanov Erhard Kemnitz

The crystal structure of a new 1:1 complex of dimethyl carbonate and 2,4,6-tris(trifluoromethyl)-1,3,5-triazine is reported. A high tendency of sublimation was observed by differential thermal analysis (DTA) and thermogravimetry (TG). Donor-acceptor interactions between dimethyl carbonate and 2,4,6-tris(trifluoro-methyl)-1,3,5-triazine are assumed to be responsible for the complex formation.

Dimethyl carbonate

Sublimation

Thermogravimetry

1,3,5-Triazine

Triazine

Acceptor

10.1515/znb-2003-0417

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Fluorine modified chromium oxide and its impact on heterogeneously catalyzed fluorination reactions

Journal of Fluorine Chemistry (2000)

B. Adamczyk O. Boese Norbert Weiher Sven L. M. Schroeder Erhard Kemnitz

Fluorine

XANES

10.1016/s0022-1139(99)00165-7

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Citations (39)

ChemInform Abstract: Fluorine Modified Chromium Oxide and Its Impact on Heterogeneously Catalyzed Fluorination Reactions

ChemInform (2000)

B. Adamczyk O. Boese Norbert Weiher Sven L. M. Schroeder Erhard Kemnitz

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Fluorine

Chromium oxide

10.1002/chin.200015055

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β-AlF3 by Au 4f7/2-referenced XPS and XAES

Surface Science Spectra (2001)

Andreas Lippitz O. Boese Erhard Kemnitz Wolfgang E. S. Unger

Powder x-ray diffraction (XRD) defined β-AlF3 has been investigated by x-ray photoelectron spectroscopy (XPS) and x-ray excited Auger electron spectroscopy (XAES). The Au 4f7/2 orbital is used for static charge referencing. This feature originates from well-defined and chemically inert 20 nm highly dispersed gold particles deposited on the sample surface. The particles, with a narrow particle size distribution, were obtained from a highly purified colloidal solution (sodium concentration below 1 mg/l). This procedure allows a determination of gold-referenced XPS and XAES data sets.

Auger electron spectroscopy

10.1116/11.20000403

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Citations (3)

γ-Al2O3 by Au 4f7/2-referenced XPS and XAES

Surface Science Spectra (2001)

Andreas Lippitz O. Boese Erhard Kemnitz Wolfgang E. S. Unger

Powder x-ray diffraction (XRD) defined γ-Al2O3 has been investigated by x-ray photoelectron spectroscopy (XPS) and x-ray excited Auger electron spectroscopy (XAES). The Au 4f7/2 orbital is used for static charge referencing. This feature originates from well-defined and chemically inert 20 nm highly dispersed gold particles deposited on the sample surface. The particles, with a narrow particle size distribution, were obtained from a highly purified colloidal solution (sodium concentration below 1 mg/l). This procedure allows a determination of gold-referenced XPS and XAES data sets.

Auger electron spectroscopy

10.1116/11.20020305

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Citations (2)