Exfoliated nanosheets as a new strong solid acid catalyst

Atsushi Takagaki, Mariko Sugisawa, Darling Lu, Junko N. Kondo, Michikazu Hara, Kazunari Domen, Shigenobu Hayashi

Research output: Contribution to journalArticlepeer-review

247 Citations (Scopus)


Two-dimensional metal oxide sheets in HTiNbO5 and HSr2Nb3O10, cation-exchangeable layered metal oxides, were examined as solid acid catalysts. Exfoliation of HTiNbO5 and HSr2Nb3O10 in aqueous solutions formed colloidal single-crystal TiNbO5- and Sr2Nb3O10- nanosheets, which precipitated under an acidic condition to form aggregates of HTiNbO5 nanosheets and HSr2Nb3O10 nanosheets. Although esterification of acetic acid, cracking of cumene, and dehydration of 2-propanol were not catalyzed by original HTiNbO5 because of the narrow interlayer distance, which prevents the insertion of organic molecules, HTiNbO5 nanosheets functioned as a strong solid acid catalyst for the reactions. Nanosheets of HSr2Nb3O10 exhibited no or slight catalytic activity for these reactions. NH3 temperature-programmed desorption and 1H magic-angle spinning nuclear magnetic resonance spectroscopy revealed that HTiNbO5 nanosheets have strong Brønsted acid sites, whereas HSr2Nb3O10 nanosheets do not.

Original languageEnglish
Pages (from-to)5479-5485
Number of pages7
JournalJournal of the American Chemical Society
Issue number18
Publication statusPublished - May 7 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry


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