以脱脂棉为模板制备高比表面积Al_2O_3-MgO固体酸碱双功能材料  

Preparation of Al_2O_3-MgO Acid/Base Bifunctional Material with High Specific Surface Area Using Degreasing Cotton as Exotemplate

作　　者：蓝冬雪[1] 林丹[1] 赵会民[1] 马丽[1] 淳远[1] 

机构地区：[1]南京大学化学化工学院介观化学教育部重点实验室,江苏南京210093

出　　处：《催化学报》2011年第7期1214-1219,共6页

基　　金：国家自然科学基金(20873061);南京大学开放测试基金(0205001330)~~

摘　　要：以脱脂棉为模板,以四水乙酸镁和九水硝酸铝为前驱物,采用外模板法制备了一系列Al2O3-MgO混合氧化物,并用X射线衍射、扫描电镜、低温N2吸附等手段对其进行了表征.结果表明,所制样品显示出棉纤维的生物形态,且具有较高的比表面积(可达206m2/g).Mg含量较低时Al2O3-MgO混合氧化物为无定形结构,当Mg/Al=1时开始出现MgO的纳米晶相.在环戊二烯甲醇烷基化反应中,具有生物形态和酸碱双功能的Al2O3-MgO混合氧化物表现出较高的催化活性,明显高于未使用模板制得的固体碱,并当Mg/Al=20时样品催化性能最佳.A series of Al2O3-MgO mixed oxide samples were prepared via an exotemplating pathway using degreasing cotton as template and magnesium acetate and aluminum nitrate as MgO and Al2O3 precursors,respectively. The resulting solid acid/base bifunctional material samples were characterized by X-ray diffraction,scanning electron microscopy,and nitrogen adsorption. It was found that these as-prepared Al2O3-MgO material samples replicated the biomorph of cotton fibre and represented high specific surface area（206 m2/g） . Amorphous structure was formed at lower Mg content,and the nanocrystals of MgO appeared when the molar ratio of Mg/Al increased to 1. In the me-thylation of cyclopentadiene,the biomorphic solid acid/base bifunctional material exhibited the catalytic performance much better than the catalyst prepared without using cotton template,and the best result was achieved with a Mg/Al ratio of 20.

关 键 词：外模板 脱脂棉 氧化镁 氧化铝 高比表面积 固体碱 环戊二烯 甲基化 甲基环戊二烯 

分 类 号：O643.32[理学—物理化学]