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  • 1
    Electronic Resource
    Electronic Resource
    Linear combination of XANES for quantitative analysis of Ti–Si binary oxides (2001)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 8 (2001), S. 163-167 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A new method is demonstrated for the quantification of Ti—O—Si and Ti—O—Ti bonds in Ti–Si binary oxides. It is based on the linear combination of two reference X-ray absorption near-edge structure (XANES) spectra at the Ti K edge. The proper selection of a Ti—O—Si reference material is most important for the successful application of this method. Three Ti–Si binary oxide systems have been analysed by the new method: Ti–Si mixed oxides, titania supported on silica and Ti-substituted MCM-41 (crystalline mesoporous molecular sieve material invented by Mobil) with various Ti contents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049500020331
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    XAFS study on Mn-Ni/Al2O3 catalyst for carbon dioxide reforming of methane (2001)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 8 (2001), S. 596-598 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: As an effective catalyst for carbon dioxide reforming of methane, manganese-promoted Ni/Al2O3 catalyst was studied with XAFS. The catalysts after the reduction above 1073 K contained the metallic nickel, and several phases of manganese were shown by XANES and EXAFS. Results of EXAFS curve fitting indicated that the surface of large metallic nickel particles was partly covered with patches of MnO and metallic Mn. Radial structure function (RSF) of Mn K-edge showed the peaks due to Mn-Ni scattering without Mn-Mn scattering, indicating that the metallic manganese was attached to nickel in a highly dispersed state. Separate manganese phase was also formed without interaction with nickel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049500016198
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    XAFS characterization of supported PdCl2−CuCl2 catalysts for CO oxidation (1996)
    Springer
    Reaction kinetics and catalysis letters 57 (1996), S. 227-236 
    Details
    ISSN: 1588-2837
    Keywords: Supported PdCl2−CuCl2, CO oxidation ; XAFS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A heterogenized Wacker catalyst system in which pores of a high surface area alumina were filled with an aqueous solution of PdCl2−CuCl2 was active for the oxidation of CO near room temperature. The structure of thecatalyst was studied by XRD and XAFS. The active phase of Pd was a molecular Pd species whose structure was similar to PdCl2, probably modified by a carbonyl ligand. The active phase of copper was found to be solid Cu2Cl(OH)3 particles. The presence of Cu was essential to keep the Pd in the Pd(II) state during the reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02064737
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    Paper (German National Licenses)
    Fulltext
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