Control of selectivity in phenol hydroxylation using microstructured catalytic wall reactors

Kunio Yube, Masashi Furuta, Nobuaki Aoki, Kazuhiro Mae

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    22 Citations (Scopus)


    Selective hydroxylation of phenol to benzenediols with hydrogen peroxide aqueous solution over titanium silicalite-1 (TS-1) catalyst was performed using microstructured catalytic wall reactors. We investigated effects on the reaction results of various reaction conditions, such as reactant conversion and product selectivities were investigated. The regioselectivity of the parallel reactions, i.e., the molar ratio of para-diol (hydroquinone) to ortho-diol (catechol), is known to be dependent on the reaction parameters, such as temperature and reactant concentrations. In this study, we found that the selectivity also depends on the characteristics of the microreactor, such as catalyst placement and sizes of microchannels, which contributed significantly to the reactant concentrations on the catalyst surface. Especially, the selectivities changed markedly with increases in the height of microchannels. The results indicated that the regioselectivities could be arranged linearly as a function of Sh number, expressed by the velocity u and the design parameters of the microreactor, i.e., microchannel height H and microchannel length L.

    Original languageEnglish
    Pages (from-to)278-286
    Number of pages9
    JournalApplied Catalysis A: General
    Issue number2
    Publication statusPublished - 2007 Aug 15


    • Heterogeneous catalyst
    • Hydroxylation of phenol
    • Microreactors
    • Selective oxidation

    ASJC Scopus subject areas

    • Catalysis
    • Process Chemistry and Technology


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