共沸蒸馏-均匀沉淀法制备大孔体积和孔径的介孔纳米γ-Al_2O_3  

Preparation of Mesoporous Nano-Alumina with Large Pore Volume and Pore Diameter by Azeotropic Distillation-Homogeneous Precipitation

作　　者：包建国[1] 杨运泉[1] 王威燕[1] 王玉林[1] 刘文英[1] 

机构地区：[1]湘潭大学化工学院,湖南湘潭411105

出　　处：《石油化工》2009年第8期839-844,共6页Petrochemical Technology

基　　金：国家自然科学基金项目(20576110);湖南省科技厅攻关项目(06FJ4106);湖南省教育厅重点项目(05A003)

摘　　要：以Al2(SO4)3为铝源、NH4HCO3为沉淀剂,采用共沸蒸馏-均匀沉淀法与超声波分散技术相结合制备出γ-Al2O3前体,该前体在600℃下煅烧4h得到纤维状纳米γ-Al2O3粉体;采用傅里叶变换红外光谱、热重分析、X射线衍射、BET法、扫描电子显微镜等手段对所制得的前体和纳米γ-Al2O3进行了表征。表征结果显示,将NH4HCO3溶液均匀缓慢加入到Al2(SO4)3溶液中,添加适量聚乙二醇作为分散剂,同时采用异丁醇共沸蒸馏可制备出粒径分布均匀、孔径与孔体积大、比表面积大的介孔纤维状纳米γ-Al2O3粉体;所制得的纳米γ-Al2O3的孔径为18.04nm、孔体积为1.87mL/g、比表面积为370.11m2/g,颗粒粒径约为75nm、长为300nm。Precursor of objective γ-Al2O3 was prepared from Al2 （SO4 ）3 and NH4HCO3 by azeotropic distillation-homogeneous precipitation combined with ultrasonic dispersion. For precipitation of precursor, NH4HCO3 solution must be slowly added into Al2 （SO4）3 solution in presence of appropriate amount of polyethylene glycol as dispersing agent. The water in wet precipitate was entrained by azeotropic distillation with butanol. The end product fibrous nano mesoporous γ-Al2O3 powder was obtained from the precursor after calcination at 600 ℃ for 4 h. The precursor and the end product were characterized by means of FTIR, TG, XRD, BET and SEM. The fibrous nano mesoporous γ-Al2O3 powder was uniform in particle size distribution with large pore volume, large pore size and high specific surface area. The pore diameter was 18.04 nm;pore volume was 1.87 mL/g; specific surface area was 370.11 m2/g, average particle diameter was 75 nm and average particle length was 300 nm.

关 键 词：共沸蒸馏-均匀沉淀法 介孔纳米氧化铝 孔结构 

分 类 号：TQ133.1[化学工程—无机化工]