MICRO-GRATING OF PSEUDOMORPHIC AMORPHOUS PHASE AND MICRO-CUBIC CRYSTALLINE PHASE OBTAINED BY ALKALI DISSOLUITON OF ISOTHERMAL TREATED NH_4-ZEOLITE A

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概要

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• Ammonium exchanged zeolites A were isothermally treated at 400-1000℃ for durations up to 100 min in the air, and then were leached in 1 M NaOH solution at 70℃. The products were characterized by XRD, SEM, ICP-AES and ATR-FTIR. The results from isothermal treatments confirmed that the pseudomorphic transformations took place through the formations of an amorphous phase with the tweed-like patterns on the surface of the cubic solid and a subsequent recrystallization to a cubic-shaped composite of mullite and amorphous material. These characterizations supported the existence of a thin surface layer of zeolite crystals acting as a microvessel, which was consistent with a previous hypothesis. After leaching by hot alkali solution, micro-grating patterns appeared on the surfaces of the pseudomorphic amorphous phase which exhibited the tweed-like patterns. A cubic solid with fine voids were obtained from a composite of mullite and an amorphous phase. The observed differences in the surface morphology are closely related to the investigated solids.

• 日本粘土学会の論文

著者

• TAMURA KENJI

  National Institute for Materials Science

• YAMADA HIROHISA

  National Institute for Materials Science

• Komatsu Yu

  College Of Environmental Engineering And Architecture Kanazawa Institute For Technology

• Hatta Tamao

  Japan International Res. Center For Agricultural Sci. Ibaraki Jpn

• Pascua Chelo

  Photocatalytic Materials Center National Institute For Materials Science

• Yamada Hirohisa

  National Institute For Research In Inorganic Materials

• TAMURA Kenji

  Photocatalytic Materials Center, National Institute for Materials Science

• Yamada H

  National Institute For Research In Inorganic Materials

• Yamada Hirohisa

  Photocatalystic Materials Center National Inst. For Materials Sci.

• Yamada Hirohisa

  National Institute For Materials Science (nims)

• NEMOTO Seiko

  Japan International Research Center for Agricultural Sciences (JIRCAS)

• Nemoto Seiko

  Japan International Research Center For Agricultural Sciences

• WATANABE YUJIRO

  College of Environmental Engineering and Architecture, Kanazawa Institute for Technology

• YOKOYAMA SHINGO

  Civil Engineering Research Laboratory, Central Research Institute of Electric Power Industry

• YOKOYAMA SHINGO

  Photocatalytic Materials Center, National Institute for Materials Science

• TAMURA Kenji

  NIMS

• Tamura Kenji

  National Institute For Materials Science (nims)

• Yokoyama Shingo

  Photocatalytic Materials Center National Institute For Materials Science

• Watanabe Yujiro

  College Of Environmental Engineering And Architecture Kanazawa Institute For Technology

• WATANABE YUJIRO

  College of Bioscience and Chemistry, Department of Applied Chemistry, Kanazawa Institute of Technology

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