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

一水硬铝石热分解制备活性α-氧化铝粉体

基本信息

批准号：
01550584
负责人：
TSUCHIDA Takeshi
金额：
$ 1.28万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550584/
关键词：
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

项目摘要

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.

1.在1N NaOH、450^ﾟC、1200kg/cm^2条件下合成了一水硬铝石针状单晶(βーAl_2O_3·H_2O)(宽度<lmum，长度<10mum)，并通过XRD、SEM、ED、IR和^<27>A1 MASNMR对其进行了表征。2．一水硬铝石的脱水动力学符合由成核生长控制过程推导的Avrami-Erofeev方程。 3．一水硬铝石在490℃脱水，出现DTA吸热峰，直接转化为α-Al_2O_3。即使加热到1300^ﾟC，一水硬铝石晶体原有的外形也没有被破坏，这表明一水硬铝石已局部转变为Al_2O_3.4。 530^ﾟC 时水硬铝石和所得α-Al_2O_3 的比表面积分别为4 和70 m^2/g。尽管α-Al_2O_3具有较大的表面积，但对1-丁烯异构化为2-丁烯没有表现出任何催化活性。5．研究了从水硬铝石中获得的针状α-Al_2O_3颗粒作为先进新材料的应用。