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Preparation of Active Alpha-Alumina Powder by the Thermal Decomposition of Diaspore

Research Project

Project/Area Number 01550584
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 無機工業化学
Research InstitutionHokkaido University

Principal Investigator

TSUCHIDA Takeshi  Hokkaido Univ., Fac. of Eng., Assistant, 工学部, 助手 (40041959)

Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1990: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1989: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsDiaspore / Alpha-alumina / Hydrothermal synthesis / Acicular particle / Dehydration kinetics / Surface reactivity / ^<27>Al MASNMR spectra / Specific surface area / ^<27>Al MASNMRスペクトル / アルミナ水和物 / diaspore / α-アルミナ / 反応性
Research Abstract

1. An acicular single crystal of diaspore (betaーAl_2O_3・H_2O) (width <lmum, length <10mum) was synthesized under the conditions of 1N NaOH, 450^゚C and 1200kg/cm^2 and characterized by means of XRD, SEM, ED, IR and ^<27>A1 MASNMR.
2. Dehydration kinetics of diaspore fitted Avrami-Erofeev equation which derived from nucleation-growth controlled process.
3. Diaspore showed a DTA endothermic peak due to the dehydration at 490^゚C and transformed directly to alpha-Al_2O_3. Even on heating to 1300^゚C, the original external shape of diaspore crystal was not destroyed, which indicated that diaspore transformed topotactically toalp ha-Al_2O_3.
4. Specific surface areas of diaspore and resulting alpha-Al_2O_3 at 530^゚C were 4 and 70 m^2/g. alpha-Al_2O_3 did not show any catalytic activity for the isomerization of 1-butene to 2-butene, in spite of the large surface area.
5. Application of acicular alpha-Al_2O_3 particles obtained from diaspore as an abvanced new material is investigated.

Report

(3 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] Takeshi Tsuchida: "Hydrothermal synthesis and characterization of diaspore,βーAl_2O_3・H_2O" Journal of Material Science. 25. 4423-4426 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Takeshi Tsuchida: "Hydrothermal synthesis and characterization of diaspore, beta-Al_2O_3・H_2O" Journal of Material Science. 25. 4423-4426 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Takeshi Tsuchida: "Hydrothermal synthesis and characterization of diaspore,βーAl_2O_3・H_2O" Journal of Material Science. 25. 4423-4426 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Takeshi Tsuchida: "Hydrothermal Synthesis and Characterization of Diaspore." Journal of Materials Science. (1990)

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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