Selective catalytic oxidation of arabinose - A comparison of gold and palladium catalysts

Bright T. Kusema, Betiana C. Campo, Päivi Mäki-Arvela, Tapio Salmi, Dmitry Yu Murzin

    Research output: Contribution to journalArticleScientificpeer-review

    23 Citations (Scopus)

    Abstract

    Aqueous-phase selective oxidation of arabinose by molecular oxygen was studied in an isothermal shaking reactor at moderate conditions of 50-70 °C and pH 6-9. Different gold and palladium catalysts on metal oxide and carbon supports were tested. High catalyst activity and selectivity to arabinonic acid were achieved with Au/Al2O3 catalyst. Pd catalysts were characterized with low activity and selectivity due to the increase of the amount of by-products. The influence of the kinetic parameters such as pH, temperature, and oxygen flow rate was investigated. In situ catalyst potential measurements during arabinose oxidation gave information about the extent of the oxygen accumulation on the metal surface and a correlation to activity was obtained. The apparent activation energy Ea for the selective oxidation of arabinose to arabinonic acid was 23.8 kJ mol-1 based on the temperature dependence of the experimental data.

    Original languageEnglish
    Pages (from-to)101-108
    Number of pages8
    JournalApplied Catalysis A: General
    Volume386
    Issue number1-2
    DOIs
    Publication statusPublished - 30 Sep 2010
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Arabinose
    • Electric chemical potential
    • Gold catalysts
    • Oxidation

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