【摘要】 分别以十二烷基苯磺酸钠(DBS)、溴化十六烷基三甲铵(CTAB)和吐温-80(TW-80)为模板剂,以硝酸铝为铝源,采用溶胶-凝胶法制备介孔纳米γ-氧化铝。用X射线衍射(XRD)、氮气吸附-脱附、透射电镜(TEM)对样品进行表征;考察了模板剂的种类及用量对产品性能的影响。实验结果表明:采用3种不同模板剂合成的前驱体经550℃煅烧所得产物均为具有孔道结构的介孔纳米γ-氧化铝,其中采用CTAB为模板剂合成的样品其比表面积为551.8 m2/g,平均孔径为6.68 nm,孔径分布较窄(2~16 nm),孔容为0.922 cm3/g,比采用另外两种模板剂合成的样品其孔道分布更均匀,排列更规则致密,孔径分布明显变窄,比表面积有一定程度的增大。更多还原

【Abstract】 Different nano-sized mesoporous γ-Al2O3 were synthesized by sol-gel process using Al(NO3)3·9H2O as aluminum source,with sodium dodecyl-benzenesulfonate(DBS),cetyltrimethyl ammonium bromide(CTAB),and Tween-80(TW-80)as templates respectively.Samples were characterized by XRD,N2 absorption-desorption,and TEM,and the influences of type and amount of template on product′s performances were also investigated.Results indicated that precursors synthesized by three different template agents,all turned to nano-sized mesoporous γ-Al2O3 with porous structure after calcination at 550 ℃.Specific surface area,average pore diameter,pore size distribution,and pore volume of the sample synthesized by CTAB were 551.8 m2/g,6.68 nm,2~16 nm,and 0.922 cm3/g,respectively.Compared with those synthesized by DBS or TW-80,CTAB resulted in more homogeneous pore distribution,more compact and regular pore arrangement,obviously narrower pore size distribution,and a certain extent increase of specific surface area.更多还原