乙二胺和聚乙二醇在纳米介孔氧化铝制备中的协同导向作用  

Co-Templating Role of EDA and PEG in Synthesis of Mesoporous Alumina

作　　者：孙允凯[1,2] 肖新荣[1] 阳鹏飞[1] 孙中溪[2] 

机构地区：[1]南华大学化学化工学院,衡阳421001 [2]济南大学化学化工学院,济南250022

出　　处：《化学学报》2011年第23期2807-2811,共5页Acta Chimica Sinica

基　　金：国家自然科学基金(Nos.50874052;20677022);国家重大科学研究计划(No.2011CB933700)资助项目

摘　　要：以无机铝盐Al(NO3)3为原料,以乙二胺和聚乙二醇为协同模板导向剂,与氨水反应,经过"沉淀-超声-煅烧"等过程,制得介孔纳米氧化铝.用TEM,XRD,N2吸附-脱附等测试技术对样品进行了测试和表征.研究结果表明,所得样品具有相当高的比表面积(510 m2 g-1)、较大孔容(1.13 cm3 g-1)和较为集中的孔径(5.8 nm)分布.根据乙二胺和氧化铝表面的溶液化学反应及在不同pH条件下的溶液组分分布,探讨了它们在介孔氧化铝制备过程中的协同模板作用机理.Nano-scale mesoporous alumina powder（γ-Al2O3） was synthesized by a precipitation-ultrasonic treatment-calcination method using aluminum nitrate and ammonia solution as raw materials and ethyl diamine（EDA）/polyethyleneglycol（PEG） as co-template agents.The samples were characterized by transmission electron microscope（TEM）,X-ray diffraction（XRD）,N2 adsorption-desorption and acid-base titration methods.The results showed that the samples can be transformed into nano-sized mesoporous γ-Al2O3 with needle or rodlike morphology,centralized pore size distribution and stable structure.The average pore size,pore volume and specific surface area of the obtained sample were 5.8 nm,1.13 cm3og-1 and 510 m2og-1 respectively.A co-templating mechanism of EDA and PEG in the synthesis of mesoporous alumina was discussed based on the chemical reactions and speciation of EDA and alumina surfaces as a function of pH in aqueous solution.

关 键 词：乙二胺 介孔氧化铝 协同模板 

分 类 号：O614.31[理学—无机化学]