催化学报 ›› 2011, Vol. 32 ›› Issue (7): 1214-1219.DOI: 10.3724/SP.J.1088.2011.10237

• 研究论文 • 上一篇    下一篇

以脱脂棉为模板制备高比表面积 Al2O3-MgO 固体酸碱双功能材料

蓝冬雪, 林丹, 赵会民, 马丽, 淳远*   

  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
  • 收稿日期:2011-02-24 修回日期:2011-03-21 出版日期:2011-07-18 发布日期:2014-11-28

Preparation of Al2O3-MgO Acid/Base Bifunctional Material with High Specific Surface Area Using Degreasing Cotton as Exotemplate

LAN Dongxue, LIN Dan, ZHAO Huimin, MA Li, CHUN Yuan*   

  1. Key Laboratory of Mesoscopic Chemistry of the Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, Jiangsu, China
  • Received:2011-02-24 Revised:2011-03-21 Online:2011-07-18 Published:2014-11-28

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 206 m2/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.

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

Abstract: 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 methylation 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.

Key words: exotemplate, degreasing cotton, magnesia, alumina, high specific surface area, solid base, cyclopentadiene, methylation, methyl cyclopentadiene