摘要
1.0 g碱式碳酸镁为碱源,在110℃加入15 mL氨水,通过20 g过量硫酸铝的均匀共沉淀反应,制备出了粒径约为500 nm的立方形Al（OH）3。对获得的Al（OH）3在不同温度进行焙烧,结果发现,450～600℃焙烧出的样品为无定形氧化铝;850℃焙烧的样品为κ-、θ-和η-Al2O3的混合物;当温度高于1 200℃时,得到纯相的α-Al2O3。通过SEM和TEM对焙烧前后的样品进行观察显示,样品的形貌不受温度的影响,均为立方形。
Cubic aluminum hydroxide with particle size of 500 nm was prepared at 110 ℃ by homogeneous co-precipitation of 20 g aluminum sulfate and 15 mL of aqueous ammonia solution,using 1. 0 g basic magnesium carbonate as the base source. The as-synthesized aluminum hydroxide was calcinated at different temperatures. It was found that amorphous A1203 was obtained in the temperature range of 450 ～600 ℃, the κ-, θ- and η-Al2O3 were obtained at calcinations temperature of 850 ℃ and pure-phase α-Al2O3 was obtained at 1 200 ℃. Based on TEM and SEM, the morphology of the product is all cubic before and after calcination.
出处
《精细化工》
CAS
CSCD
北大核心
2008年第6期558-561,共4页
Fine Chemicals
基金
国家自然科学基金(20577050)
国家重点基础研究计划资助课题(2003CB415001)~~
关键词
氢氧化铝
立方形氧化铝
共沉淀
aluminum hydroxide
cubic alumina
co-precipitation
