Correlating Catalytic Methanol Oxidation with the Structure and Oxidation State of Size-Selected Pt Nanoparticles

    Authors

    L. R. Merte; M. Ahmadi; F. Behafarid; L. K. Ono; E. Lira; J. Matos; L. Li; J. C. Yang;B. R. Cuenya

    Comments

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    Abbreviated Journal Title

    ACS Catal.

    Keywords

    platinum; methanol oxidation; operando; XAFS; EXAFS; XANES; alumina; nanoparticle; size-selected; X-RAY-ABSORPTION; SUPPORTED PLATINUM CATALYSTS; PT-GROUP METALS; CO; OXIDATION; MICELLE ENCAPSULATION; PARTICLE-SIZE; SILVER CATALYSTS; FINE-STRUCTURE; SPECTROSCOPY; PALLADIUM; Chemistry, Physical

    Abstract

    We have investigated the structure and chemical state of size-selected platinum nanoparticles (NPs) prepared by micelle encapsulation and supported on gamma-Al2O3 during the oxidation of methanol under oxygen-rich reaction conditions following both oxidative and reductive pretreatments. X-ray absorption near-edge structure ()CANES) and extended X-ray absorption fine-structure (EXAFS) spectroscopy measurements reveal that in both cases, the catalyst is substantially oxidized under reaction conditions at room temperature and becomes partially reduced when the reactor temperature is raised to 50 degrees C. Reactivity tests show that at low temperatures, the preoxidized catalyst, in which a larger degree of oxidation was observed, is more active than the prereduced catalyst. We conclude that,the differences in reactivity can be linked to the formation and stabilization of distinct active oxide species during the pretreatment.

    Journal Title

    Acs Catalysis

    Volume

    3

    Issue/Number

    7

    Publication Date

    1-1-2013

    Document Type

    Article

    Language

    English

    First Page

    1460

    Last Page

    1468

    WOS Identifier

    WOS:000321606100006

    ISSN

    2155-5435

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