Highly and stably dispersed Pt catalysts supported over La 1-xSrxAlO3-0.5x perovskite for oxidative methane activation and their structures

Daiki Mukai, Yoshiyuki Izutsu, Yasushi Sekine

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    Catalytic activity for oxidative methane conversion (partial oxidation of methane) over Pt catalyst supported on La1-xSrxAlO 3-0.5x was investigated. Pt/La0.7Sr0.3AlO 2.85 showed higher and more stable hydrogen yield than Pt/α-Al2O3 did. Pt/La0.7Sr 0.3AlO2.85 showed higher catalytic activity for steam reform of methane even in an oxidative atmosphere, which was attributable to high Pt dispersion in the oxidative reaction atmosphere. Pt dispersion over La0.8Sr0.2AlO2.9 or La0.7Sr 0.3AlO2.85 increased concomitantly with increasing calcination temperature in air. This phenomenon was not observed by aging in He flow. From structural analyses using XRD, XPS, EXAFS, and XANES, the interaction or coordination between Pt and surface oxygen (Os) was observed. This coordination was weakened in a reductive atmosphere and regenerated in an oxidative atmosphere. This interaction or coordination between the Pt and La1-xSrxAlO3-0.5x contributed to high Pt dispersion in an oxidative atmosphere and to high catalytic activity for the partial oxidation of methane.

    Original languageEnglish
    Pages (from-to)71-81
    Number of pages11
    JournalApplied Catalysis A: General
    Volume458
    DOIs
    Publication statusPublished - 2013 May 10

    Fingerprint

    Methane
    Catalyst supports
    Perovskite
    Chemical activation
    Catalyst activity
    Oxidation
    Steam
    Calcination
    Hydrogen
    X ray photoelectron spectroscopy
    Aging of materials
    Oxygen
    perovskite
    Air
    Temperature

    Keywords

    • High dispersion
    • Lattice oxygen
    • Oxidative atmosphere
    • Partial oxidation of methane
    • Perovskite support
    • Pt catalyst

    ASJC Scopus subject areas

    • Catalysis
    • Process Chemistry and Technology

    Cite this

    Highly and stably dispersed Pt catalysts supported over La 1-xSrxAlO3-0.5x perovskite for oxidative methane activation and their structures. / Mukai, Daiki; Izutsu, Yoshiyuki; Sekine, Yasushi.

    In: Applied Catalysis A: General, Vol. 458, 10.05.2013, p. 71-81.

    Research output: Contribution to journalArticle

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