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

研究成果: Contribution to journalArticle査読

94 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)11549-11555
ページ数7
ジャーナルJournal of Physical Chemistry B
108
31
DOI
出版ステータス出版済み - 8 5 2004
外部発表はい

All Science Journal Classification (ASJC) codes

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

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