摘要
以NH4Al(SO4)2和NH4HCO3为原料,用沉淀法在搅拌转速10000r/min,1%(质量分数)分散剂PEG1000,陈化15h的条件下制备了氧化铝前驱体碳酸铝铵(AACH)。经850℃×30min煅烧制得了粒度为20～30nm,比表面积为245.8m2/g,形貌为球形的纳米γAl2O3,并研究了AACH焙烧过程中晶体结构的变化。研究表明:搅拌强度、有机表面活性剂、陈化时间对前驱体晶体结构有重要影响。γAl2O3的粒径分布及形貌与AACH的粒径分布及形貌有密切的关系;强化搅拌及添加有机表面活性剂对阻止纳米颗粒的团聚有较好的效果;室温下陈化时间超过30h,前驱体形貌有转变为棒状的趋势。
Ammonium aluminum carbonate hydroxide (AACH),the precursor of alumina,has been synthesized by precipitation method using NH_4Al(SO_4)_2 and NH_4HCO_3 as raw materials under the condition of stirring speed 10000 rpm,adding dispersion 1%PEG1000 and aging 15h.After calcination at 850℃×30min,a spherical Nano-γ-Al_2O_3,with original particle sizes of 20-30nm and the specific surface area of 245.8 sq.m/g is obtained.The crystal structure changes during the calcinations of AACH have been studied as well.The above experiment results show:the precursor of alumina is greatly influenced by stirring strength,organic dispersion and aging time.The particle size and distribution and the crystal structure of γ-Al_2O_3 are closely related to the ones of AACH;Enhancing stirring strength and adding organic dispersion are helpflul to resist the agglomeration of nano-sized particles.As the aging time is over 30h at indoor temperature,the precursor crystal structure tends to take the shape of rod.
出处
《河南科技大学学报（自然科学版）》
CAS
2005年第4期1-4,共4页
Journal of Henan University of Science And Technology:Natural Science
基金
中国铝业股份有限公司重点科技攻关项目(2003Z-CB-d01)
关键词
碳酸铝铵
热解法
氧化铝
纳米技术
Aluminum carbonate hydroxide
Thermal decomposition
Aluminum oxide
Nano technology
