Preparation of Active Alpha-Alumina Powder by the Thermal Decomposition of Diaspore
| Project/Area Number |
01550584
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
無機工業化学
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| Research Institution | Hokkaido University |
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Principal Investigator |
TSUCHIDA Takeshi Hokkaido Univ., Fac. of Eng., Assistant, 工学部, 助手 (40041959)
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| Project Period (FY) |
1989 – 1990
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| Project Status |
Completed (Fiscal Year 1990)
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| 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)
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| Keywords | Diaspore / 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 |
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| 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.
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Report
(3 results)
Research Products
(4 results)
