SBA-15负载γ-Fe2O3纳米晶的溶胶-凝胶法合成实验研究  

Experimental research on synthesis of SBA-15 loaded γ-Fe2O3 nanocrystals via sol-gel process

作　　者：梁祎[1] 李慧君[1] 顾娟[1] 申战辉[1] 李健生[1] 孙秀云[1] 王连军[1] 

机构地区：[1]南京理工大学环境科学与工程系

出　　处：《实验技术与管理》2010年第9期39-42,共4页Experimental Technology and Management

基　　金：高等学校科技创新工程重大项目培育资金项目(708049);高等学校博士学科点专项科研基金(20060288008);江苏省自然科学基金(BK2009392)

摘　　要：以P123（三嵌段共聚物）为模板剂,正硅酸乙酯和硝酸铁为前驱体,通过溶胶-凝胶法在酸性条件下合成了SBA-15负载γ-Fe2O3（Fe和Si摩尔比为0.3）的有序介孔材料。采用X射线衍射（XRD）、透射电镜（TEM）、选区电子衍射花样（SAED）和氮气吸附等手段对所合成的材料进行了结构表征。结果表明,此合成材料具有类似于SBA-15的结构,铁以高分散的γ-Fe2O3纳米晶的形式分布在介孔氧化硅基体中。对高氯酸铵的催化实验结果显示,γ-Fe2O3/SBA-15催化高氯酸铵的分解放热量由纯SBA-15的420.5 J/g提高到1 125.8 J/g,说明纳米γ-Fe2O3能够有效促进高氯酸铵的分解。Ordered mesoporous SBA-15 silica loaded with γ-Fe2O3 with molar ratio of Fe/Si=0.3 was synthesized by sol-gel route using Pluronic P123 as template,tetraethylorthosilicate as silica source and hydrated iron nitrite as precursor under acid condition.The as-synthesized materials were characterized by X-ray diffraction（XRD）,transmission electron microscopy（TEM）,selected area electron diffraction（SAED） and N2 adsorption.Characterization revealed that as-synthesized materials possess ordered hexagonal mesoporous structure similar to SBA-15.The iron species are present as highly dispersed γ-Fe2O3 nanocrystals in mesostructured silica matrix.The catalysis experiment of ammonium perchlorate decomposition shows that the decomposition heat increases to 1125.8 J/g in γ-Fe2O3/SBA-15 sample from that of 420.5 J/g in pure SBA-15 sample,indicating that γ-Fe2O3 can promote the thermal decomposition of ammonium perchlorate.

关 键 词：γ-Fe2O3/SBA-15 溶胶-凝胶 合成 催化 

分 类 号：TP383[自动化与计算机技术—计算机系统结构]