Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (04): 549-553.doi: 10.3866/PKU.WHXB20070419

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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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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