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Alumina cryogels with superior thermal stability for catalyst supports

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Abstract

Alumina cryogels were synthesized from a colloidal boehmite sol through a sol–gel processing and subsequent freeze drying, and thermal stability was examined by comparison to that of the corresponding xerogel, precipitate and commercial alumina. N2 adsorption, X-ray powder diffraction and transmittance electron micrography observations revealed that the stability was higher for the cryogel than for others in particular at temperatures above 1,000 °C. The higher stability was ascribed to the fine and uniform primary particles with fibrous shapes formed by the sol–gel technique and furthermore to the suppression of aggregation of the primary particles owing to the subsequent freeze drying. It was also found that aluminum sec-butoxide employed as a precursor for the preparation of boehmite sol was preferable compared to aluminum iso-propoxide.

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Acknowledgments

This work has been supported by the New Energy and Industrial Technology Development Organization (NEDO) under the sponsorship of Ministry of Economy, Trade and Industry (METI) of Japan.

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Authors and Affiliations

  1. National Institute of Advanced Industrial Science and Technology (AIST), 2266-98, Shimoshidami, Moriyama-ku, Nagoya, 463-8560, Japan

    Toshihiko Osaki, Kiho Yamada, Koji Watari, Koji Tajiri, Saori Shima, Takeshi Miki & Yutaka Tai

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  1. Toshihiko Osaki
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  2. Kiho Yamada
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  3. Koji Watari
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  4. Koji Tajiri
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  5. Saori Shima
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  7. Yutaka Tai
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Correspondence to Toshihiko Osaki.

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Osaki, T., Yamada, K., Watari, K. et al. Alumina cryogels with superior thermal stability for catalyst supports. J Sol-Gel Sci Technol 61, 268–274 (2012). https://doi.org/10.1007/s10971-011-2623-4

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  • DOI: https://doi.org/10.1007/s10971-011-2623-4

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