Aerobic oxidative esterification of benzyl alcohol and acetaldehyde over gold supported on nanostructured ceria-alumina mixed oxides

E Smolentseva, VV Costa, RF Cotta, Olga Simakova, S Beloshapkin, EV Gusevskaya, A Simakov

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    16 Citations (Scopus)

    Abstract

    Au nanoparticles supported on nanostructured ceria-alumina mixed oxides (10 and 30wt% ceria) were prepared by a deposition-precipitation method. Their properties were studied by N-2 adsorption, XRD, TEM, X-ray photoelectron spectroscopy, and UV/Vis spectroscopy under temperature-programmed reduction or oxidation. The materials catalyzed the liquid-phase aerobic oxidative esterification of benzyl alcohol and benzaldehyde effectively and showed a much better performance than Au supported on the individual oxides. The reactions occurred with high turnover numbers (up to 19000) in methanol solutions in the absence of any auxiliary base and gave mainly methyl benzoate. The strong synergetic effect of ceria and alumina can be explained by the enhanced oxygen storage capacity of the materials prepared from mixed oxides compared to that of pure alumina and ceria. The order of the catalytic activity (Au/Al2O3<Au/CeO2<Au/Ce(10)-Al<Au/Ce(30)-Al) correlated well with the oxygen activation capacity of the materials.
    Original languageUndefined/Unknown
    Pages (from-to)1011–1017
    Number of pages7
    JournalChemCatChem
    Volume7
    Issue number6
    DOIs
    Publication statusPublished - 2015
    MoE publication typeA1 Journal article-refereed

    Keywords

    • alcohols
    • gold
    • oxidation
    • supported catalysts

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