催化学报

催化学报 ›› 2009, Vol. 30 ›› Issue (7): 631-636.

• 研究论文 • 上一篇    下一篇

凝胶-模板法制备高比表面积氧化镁

马丽, 蒋平, 孙瑞琴, 淳远, 须沁华   

  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:2009-07-25 出版日期:2009-07-25 发布日期:2013-04-24

Preparation of High Specific Surface Area MgO by a Gel-Templating Route

MA Li, JIANG Ping, SUN Ruiqin, CHUN Yuan*, XU Qinhua   

  1. Key Laboratory of Mesoscopic Chemistry of the Ministry of Education, School of Chemistry and Chemical Engineering,Nanjing University, Nanjing 210093, Jiangsu, China
  • Received:2009-07-25 Online:2009-07-25 Published:2013-04-24

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1012

被引次数

35

摘要： 以四水乙酸镁为前驱体, 以大米粉形成的凝胶为模板, 采用新的凝胶-模板法制备了一系列的氧化镁材料, 并用 X 射线衍射、扫描电镜、低温氮气吸附-脱附、X 射线荧光分析、热重-差示扫描量热、CO2 程序升温脱附和氨程序升温脱附等手段对样品进行了表征. 该方法主要利用大米粉在水中加热形成凝胶来分散镁盐前驱体,再通氧焙烧去除模板从而获得多孔 MgO 材料. 结果表明, 制得的 MgO 具有高比表面积 (可达 206 m2/g) 和双介孔结构 (孔径分别位于 3.9 和 5~40 nm 附近). 与直接焙烧四水乙酸镁制得的 MgO 相比, 这类新型高比表面积 MgO 具有较多的强碱位和较少的酸性位, 并在异丙醇催化分解反应中表现出更高的丙酮收率和选择性, 有望成为一类优良的固体碱催化剂.

Abstract: MgO with high specific surface area was prepared using a new gel-templating route, in which a gel mixture was formed by heating rice powder in Mg(CH3COO)2?H2O solution followed by calcination in oxygen to remove the template. It contains more strong basic sites and less acidic sites and exhibits higher basic catalytic performance compared to MgO from thermal decomposition of the precursor.

Key words: gel-templating route, magnesia, rice powder, nanomaterial, high specific surface area