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

Phase separation and crystallization of Na2O-B2O3-SiO2-Sn02 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.