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

doi:10.1021/jp049170e

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 journal › Article › peer-review

102 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	11549-11555
Number of pages	7
Journal	Journal of Physical Chemistry B
Volume	108
Issue number	31
DOIs	https://doi.org/10.1021/jp049170e
Publication status	Published - Aug 5 2004
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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10.1021/jp049170e

Cite this

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title = "Titanium niobate and titanium tantalate nanosheets as strong solid acid catalysts",

abstract = "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 Br{\o}nsted acid sites that are available for this reaction.",

author = "Atsushi Takagaki and Takemi Yoshida and Darling Lu and Kondo, {Junko N.} and Michikazu Hara and Kazunari Domen and Shigenobu Hayashi",

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T1 - Titanium niobate and titanium tantalate nanosheets as strong solid acid catalysts

AU - Takagaki, Atsushi

AU - Yoshida, Takemi

AU - Lu, Darling

AU - Kondo, Junko N.

AU - Hara, Michikazu

AU - Domen, Kazunari

AU - Hayashi, Shigenobu

PY - 2004/8/5

Y1 - 2004/8/5

N2 - 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.

AB - 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.

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Titanium niobate and titanium tantalate nanosheets as strong solid acid catalysts

Abstract

All Science Journal Classification (ASJC) codes

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