微晶
热液循环
煅烧
谢乐方程
水热合成
材料科学
晶格常数
降水
衍射
分析化学(期刊)
X射线晶体学
矿物学
结晶学
化学工程
化学
催化作用
色谱法
物理
有机化学
光学
工程类
气象学
作者
Haris Puspito Buwono,Satworo Adiwidodo,Hangga Wicaksono,Hilmi Iman Firmansyah
出处
期刊:IOP conference series
[IOP Publishing]
日期:2021-02-01
卷期号:1073 (1): 012011-012011
标识
DOI:10.1088/1757-899x/1073/1/012011
摘要
Abstract The study of hydrothermal treatment on the phase formation and the crystallites of gamma-alumina (γ-Al 2 O 3 ) was performed. Different reaction time and temperature of hydrothermal treatment were investigated. The preparation of γ-Al 2 O 3 includes precipitation of aluminum nitrate nonahydrate by ammonia, aging, washing, transferred the gel into the hydrothermal reactor, drying, and calcination at 600 °C. The precipitation was stopped at pH equals 7.5. The reaction times of hydrothermal treatment were 1 – 2 hours, and the temperatures were 140 – 200 °C. X-Ray Diffraction analysis was used to investigate the phase formation and the particle size. The results show all the samples represented pure nano γ-Al 2 O 3 . The examination of hydrothermal treatment of y-Al 2 O 3 reveals as the reaction time longer, the crystallite grows bigger, as well as the higher temperature applied. The smallest γ-Al 2 O 3 obtained based on the Scherrer equation is 4 nm and the biggest is 6.5 nm. Interestingly, the peaks of the γ-Al 2 O 3 prepared by hydrothermal treatment at the longest time and the highest temperature have shifted into a higher diffraction angle. In the case of this sample, the peaks shifted into a higher diffraction angle. That is means there is a change in the lattice structure of γ-Al 2 O 3 probably was affected by the lattice of hydroxyl content.
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