Modified TS-1 for shape selective phenol hydroxylation to hydroquinone

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

Research output: Contribution to journalArticlepeer-review

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 Jan 1

Keywords

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

ASJC Scopus subject areas

  • Catalysis
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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