Modified TS-1 for shape selective phenol hydroxylation to hydroquinone

N. K. Mal, P. Kumar, M. Sasidharan, Masahiko Matsukata

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    A new method of modification of TS-1 by weak base (aqueous NH3) treatment leads to formation of bigger crystals and generation of internal hydroxyl groups as evident by SEM and IR (hydroxyl region). All the catalysts were characterized using, XRD, N2-sorption, UV-VIS, FT-IR and SEM. Activity of the modified and unmodified TS-1 were compare in the hydroxylation of phenol to hydroquinone and catechol in presence of aqueous H 2O2. A ratio of hydroquinone to catechol over modified, (TS-1(33)/OH1 and unmodified, TS-1(33) catalysts were 1.40 and 1.15, respectively, using H2O as solvent, and 2.01 and 1.68, respectively, using MeOH as solvent. Modification of TS-1 with strong base (e.g. NaOH) causes decrease in crystallinity, and hence decreases the conversion of phenol and selectivity of hydroquinone. A new mechanism controlling the product selectivity is proposed.

    Original languageEnglish
    Pages (from-to)2618-2625
    Number of pages8
    JournalStudies in Surface Science and Catalysis
    Volume154 C
    Publication statusPublished - 2004

      Fingerprint

    Keywords

    • Hydroquinone
    • Microporous zeolite
    • SEM
    • Titanium silicate-1

    ASJC Scopus subject areas

    • Physical and Theoretical Chemistry
    • Catalysis

    Cite this