IDEAS home Printed from https://ideas.repec.org/a/wsi/srlxxx/v09y2002i01ns0218625x02002191.html
   My bibliography  Save this article

ELECTRONIC STRUCTURE AND REACTIVITY OF TM-DOPEDLa1-xSrxCoO3(TM = Ni, Fe) CATALYSTS

Author

Listed:
  • S. C. GRICE

    (Department of Physics, UMIST, PO Box 88, Manchester M60 1QD, UK)

  • W. R. FLAVELL

    (Department of Physics, UMIST, PO Box 88, Manchester M60 1QD, UK)

  • A. G. THOMAS

    (Department of Physics, UMIST, PO Box 88, Manchester M60 1QD, UK)

  • S. WARREN

    (Department of Physics, UMIST, PO Box 88, Manchester M60 1QD, UK)

  • P. G. MARR

    (Department of Physics, UMIST, PO Box 88, Manchester M60 1QD, UK)

  • D. E. JEWITT

    (Department of Physics, UMIST, PO Box 88, Manchester M60 1QD, UK)

  • N. KHAN

    (Department of Physics, UMIST, PO Box 88, Manchester M60 1QD, UK)

  • P. M. DUNWOODY

    (Department of Physics, UMIST, PO Box 88, Manchester M60 1QD, UK)

  • S. A. JONES

    (Synetix, PO Box 1, Belasis Avenue, Billingham, Cleveland, TS23 1LB, UK)

Abstract

The catalytic properties ofLaCoO3in the oxidation of organic molecules in aqueous solution are explored as a function of doping with both Sr substitution for La and Fe and Ni substitution for Co. VUV photoemission is used to explore the surface reactivity of the ceramic catalysts in aqueous solution, usingH2Oas a probe molecule. These measurements are complemented by EXAFS and XANES measurements designed to probe the local defect structure and by GC measurements of catalytic activity in the aqueous epoxidation of crotyl alcohol. We relate the observed catalytic activity to the defect structure of the doped materials. In Ni-doped materials, oxygen vacancies appear to be the predominant defect, whereas in Fe-doped samples, electron holes are stabilised on Fe, leading to very different behaviour in oxidation. The surface reactivity to water is also influenced by the TM d electron count, with water binding more strongly to Fe-doped materials than to those containing Ni. The influence of these factors on the rate of the unwanted hydrogen peroxide decomposition reaction and hence on activity in epoxidation is discussed.

Suggested Citation

  • S. C. Grice & W. R. Flavell & A. G. Thomas & S. Warren & P. G. Marr & D. E. Jewitt & N. Khan & P. M. Dunwoody & S. A. Jones, 2002. "ELECTRONIC STRUCTURE AND REACTIVITY OF TM-DOPEDLa1-xSrxCoO3(TM = Ni, Fe) CATALYSTS," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 9(01), pages 277-283.
    • Handle: RePEc:wsi:srlxxx:v:09:y:2002:i:01:n:s0218625x02002191
    DOI: 10.1142/S0218625X02002191
    as

    Download full text from publisher

    File URL: http://www.worldscientific.com/doi/abs/10.1142/S0218625X02002191
    Download Restriction: Access to full text is restricted to subscribers
    File URL: https://libkey.io/10.1142/S0218625X02002191?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    More about this item

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:wsi:srlxxx:v:09:y:2002:i:01:n:s0218625x02002191. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Tai Tone Lim (email available below). General contact details of provider: http://www.worldscinet.com/srl/srl.shtml .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.