无机材料学报

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Na2O-B2O3-SiO2-SnO2系统的分相与析晶

张文丽1,2, 金建国1, 张晓丽1   

  1. 1. 河北理工大学材料学院, 唐山 063009; 2. 中国矿业大学化学与环境工程学院, 北京 100083
  • 收稿日期:2003-11-24 修回日期:2004-01-18 出版日期:2005-01-20 网络出版日期:2005-01-20

Phase Separation and Crystallization of Na2O-B2O3-SiO2-SnO2 System

ZHANG Wen-Li1,2, JIN Jian-Guo1, ZHANG Xiao-Li1   

  1. 1. Hebei Polytechnic University, Tangshan 063009 China; 2. China University of Mining and Technology, Beijing 100083, China
  • Received:2003-11-24 Revised:2004-01-18 Published:2005-01-20 Online:2005-01-20

摘要: 对Na2O-B2O3-SiO2-SnO2四元系统的分相与析晶进行了探讨. 通过对不同组成点在热处理、化学处理各阶段的试样进行能谱分析、XRD分析及SEM分析, 确认了SnO2分布在分相结构中的富硼碱相中; 在该系统中SnO2晶体的析出有赖于分相过程; 分相结构尺度限制了SnO2的析晶尺寸. 试验结果表明, 通过控制分相结构得到了负载于多孔富硅载体的纳米尺寸的SnO2材料. 该材料具有较高的CO氧化催化活性.

关键词: Na2O-B2O3-SiO2-SnO2系, 纳米SnO2, 析晶, 分相

Abstract: Phase separation and crystallization of Na2O-B3-SiO2-SnO2 system were discussed. Samples of different component points in every stage of thermal treatment and
chemistry dealing were analysed by EDAX, XRD and SEM. The results show that SnO2 distributes in boron-alkali-rich phase separation area; the growth of SnO2 crystal in the system depends on phase separation process; the crystallization size of SnO2 is restrained by the scale of the phase
separation structure. The nanometer-SnO2 material, loaded on silicon-rich porous carrier, can be obtained by controlling phase separation structure. This material has a good ability
in CO catalyst activity.

Key words: Na2O-B2O3-SiO2-SnO2 system, nanometer-SnO2, crystallization, melt-phase

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