In situ XANES cell used for the study of lanthanum strontium cuprate deNOx catalysts

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    Abstract

    The potential NOx-reduction electro catalyst lanthanum strontium cuprate has been characterized with an in situ X-ray spectrochemical gas reaction cell. In a series of samples with increasing substitution of trivalent lanthanum by divalent strontium ions, the oxidation state of copper increased, maintaining charge neutrality, with the concentration of oxygen vacancies likely increasing at substitution ratios larger than Sr/La>0.08. During heating in air, the valence of copper ions in the structure increased. Upon exposure to NO at 500 °C the valence of copper ions in a lanthanum strontium cuprate sample decreased, whereas it remained unchanged in the strontium-free lanthanum cuprate sample.
    Original languageEnglish
    JournalChemical Physics Letters
    Volume502
    Issue number4-6
    Pages (from-to)235-240
    ISSN0009-2614
    DOIs
    Publication statusPublished - 2011

    Keywords

    • Electrolysis

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