2005 Fiscal Year Final Research Report Summary
Development of novel solid acid catalyst based on polyanion nanosheets
| Project/Area Number |
15360427
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Catalyst/Resource chemical process
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
HARA Michikazu Tokyo Institute of Technology, Chemical Resources Laboratory, Associated professor, 資源化学研究所, 助教授 (70272713)
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| Co-Investigator(Kenkyū-buntansha) |
KONDO Junko N. Tokyo Institute of Technology, Chemical Resources Laboratory, Assistant professor, 資源化学研究所, 助手 (60234936)
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| Project Period (FY) |
2003 – 2005
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| Keywords | solid-acid catalysts / cation-exchangeable layered metal oxides / nanosheets / amorphous carbon / Bronsted acid sites / sulfonic acid groups |
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| Research Abstract |
Two-dimensional metal oxide sheets in cation-exchangeable layered metal oxides such as HTiNbO_5 and HNb_3O_8 were examined as solid-acid catalysts. Exfoliation of HTiNbO_5 and HNb_3O_8 in aqueous solutions formed colloidal single-crystal TiNbO_5 and Nb_3O_8 nanosheets, precipitating under an acidic condition to form aggregates of the nanosheets. Although esterification of acetic acid, cracking of cumene and dehydration of 2-propanol were not catalyzed by original layered metal oxides because of the narrow interlayer distance, which prevents the insertion of organic molecules, the nanosheet aggregates functioned as strong solid acid catalysts for the reactions. NH_3 temperature-programmed desorption and ^1H magic-angle spinning nuclear magnetic resonance spectroscopy revealed that these nanosheet aggregates have strong Bronsted acid sites due to Nb^<5+> (or Ti^<4+>)-(OH)-Nb^<5+>.
We also found that amorphous carbon composed of small graphen sheets with high density of sulfonic acid groups function as a replacement for sulfuric acid catalyst. The material prepared from inexpensive starting materials has high thermal and chemical stability.
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[Journal Article] HNb_3O_8 nanosheets as a strong protonic solid acid.2005
Author(s)
Takagaki, Atsushi, Yoshida, Takemi, Lu, Darling, Kondo, Junko N., Hara, Michikazu, Domen, Kazunari, Hayashi, Shigenobu
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Journal Title
Chemistry of Materials 17(10)
Pages: 2487-2489
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] A Carbon Material as A Strong Protonic Acid.2004
Author(s)
Hara, Michikazu, Yoshida, Takemi, Takagaki, Atsushi, Takata, Tsuyoshi, Kondo, Junko N., Domen, Kazunari, Hayashi, Shigenobu
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Journal Title
Angewante Chemie International Edition 43
Pages: 2955-2958
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Titanium niobate nanosheets with strong Bronsted acid sites.2004
Author(s)
Takagaki, Atsushi, Yoshida, Takemi, Lu, Darling, Kondo, Junko N., Hara, Michikazu, Domen, Kazunari, Hayashi, Shigenobu
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Journal Title
Journal of Physical Chemistry B 108(31)
Pages: 11549-11555
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Exfoliated Nanosheets as a New Strong Solid Acid Catalyst.2003
Author(s)
Takagaki, Atsushi, Sugisawa, Mariko, Lu, Darling, Kondo, Junko N., Hara, Michikazu, Domen, Kazunari, Hayashi, Shigenobu
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Journal Title
Journal of the American Chemical Society 125(18)
Pages: 5479-5485
Description
「研究成果報告書概要(欧文)」より
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