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硫酸铝和氧化硅在硫酸钠熔盐中合成莫来石的动力学参数计算 被引量:1

KINETICS STUDY OF MULLITE FORMATION FROM ALUMINUM SULFATE AND SILICA IN MOLTEN SODIUM SULFATE
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摘要 以硫酸铝和氧化硅为原料,在硫酸钠熔盐中合成莫来石粉体。通过研究在不同温度下所合成粉体的物相组成和显微形貌,认为莫来石在800℃生成,在1000℃可合成出物相组成单一的莫来石粉体,在1200℃时莫来石分解。采用热分析动力学研究方法,按照热重分析曲线和Kissinger方程,计算出了在硫酸钠熔盐中合成莫来石反应的动力学参数:指前因子A为6.39×1037;表观活化能Ea为913.5kJ/mol;反应级数n近似为1。 Mullite powder has been synthesized from aluminum sulfate and silica in molten sodium sulfate. The phase composition and microstructure of mullite powders synthesized at different temperatures were investigated by X-ray diffraction and scanning elec- tion microscopy techniques. Considering that mullite formation in molten sodium sulfate started at 800 ℃, single-phase mullite pow- ders were synthesized at 1 000 ℃. Mullite powders decomposed at 1 200 ℃. The kinetics of mullite formation in molten salt was inv...
出处 《硅酸盐学报》 EI CAS CSCD 北大核心 2008年第4期498-502,共5页 Journal of The Chinese Ceramic Society
基金 国家自然科学基金(50472101)资助项目
关键词 熔盐法 莫来石 表观活化能 指前因子 反应级数 molten salt synthesis mullite apparent activation energy pre-exponential factor reaction order
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