Titanium niobate and titanium tantalate nanosheets as strong solid acid catalysts

Atsushi Takagaki, Takemi Yoshida, Darling Lu, Junko N. Kondo, Michikazu Hara, Kazunari Domen, Shigenobu Hayashi

Research output: Contribution to journalArticlepeer-review

102 Citations (Scopus)


HTiNbO5, HTi2NbO7, and HTiTaO5 nanosheets obtained by exfoliation of protonated cation-exchangeable layered metal oxides are examined as solid acids. These nanosheets exhibit high catalytic activity for esterification of acetic acid and hydrolysis of ethyl acetate, competing with niobic acid, Nb2O5·nH 2O. NH3 temperature-programmed desorption reveals that the acidity of the nanosheets corresponds to the density of strong acid sites of H-ZSM-5 or niobic acid. 1H magic-angle-spinning nuclear magnetic resonance spectroscopy suggests that bridging hydroxyl groups (Ti(OH)M) (M = Nb5+ or Ta5+)) on these titanium niobate/tantalate nanosheets function as strong Brønsted acid sites that are available for this reaction.

Original languageEnglish
Pages (from-to)11549-11555
Number of pages7
JournalJournal of Physical Chemistry B
Issue number31
Publication statusPublished - Aug 5 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry


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