物理化学学报 >> 2007, Vol. 23 >> Issue (04): 549-553.doi: 10.3866/PKU.WHXB20070419

研究论文 上一篇    下一篇

球形SiO2-Al2O3的制备、结构和性能

赵振兴; 夏春谷; 薛群基; 李殿卿; 刘鹏程   

  1. 中国科学院兰州化学物理研究所, 兰州 730000; 北京化工大学化工资源有效利用国家重点实验室, 北京100029; 中国科学院研究生院, 北京 100049
  • 收稿日期:2006-10-25 修回日期:2006-12-04 发布日期:2007-04-05
  • 通讯作者: 夏春谷 E-mail:cgxia@lzb.ac.cn

Preparation, Structure and Properties of Spherical SiO2-Al2O3 Composites

ZHAO Zhen-Xing; XIA Chun-Gu; XUE Qun-Ji; LI Dian-Qing; LIU Peng-Cheng   

  1. Lanzhou Institute of Chemical and Physics, Chinese Academy of Sciences, Lanzhou 730000, P. R. China; State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China; Graduate School of the Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2006-10-25 Revised:2006-12-04 Published:2007-04-05
  • Contact: XIA Chun-Gu E-mail:cgxia@lzb.ac.cn

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摘要： 将Na2SiO3·9H2O 溶液通过强酸性阳离子树脂进行离子交换得到酸性硅溶胶,再将硅溶胶与铝溶胶及六次甲基四胺混合后采用油柱成型法制备了球形SiO2-Al2O3复合氧化物. 通过XRD、BET 及TPD等手段对样品进行测试和表征, 结果表明, 600 ℃焙烧得到的SiO2-Al2O3中SiO2以无定型形式存在, 其比表面、孔容与表面酸性随SiO2含量的增加而提高, 孔径、堆密度随SiO2含量的提高而减小, 压碎强度基本保持不变.

关键词: 球形SiO2-Al2O3复合物, 油柱成型法, 无定型, 结构与性能

Abstract: Acidic silicon sol was prepared by ion exchange using Na2SiO3·9H2O as raw material. Spherical SiO2-Al2O3 composites were prepared by oil-drop method after mixing of silicon sol, hexamethylenetetramine, and aluminium sol. The samples were characterized and analysized by XRD, BET, and TPD. The results showed that SiO2 existed in SiO2-Al2O3 composites in amorphous phase and that specific surface area, pore volume, and surface acidity increase with the increase of SiO2 content, accompanied with the decrease of average pore diameter and bulk density. The crash strength kept approximate constant.

Key words: Spherical SiO2-Al2O3 composite, Oil-drop method, Armorphous phase, Structure and property