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用氨吸附漫反射红外光谱学方法,借助图谱拟合解谱手段,探测了不同预处理温度下蒙脱石表面酸性变化特征,并分析了其变化原因。结果表明,低温热处理后的蒙脱石,其B酸和L酸量增大;经较高温度(400、600℃)煅烧的样品,层间距急剧减小,氨分子难以进入层间与酸位发生反应,可探测到的两种酸量都将减少。
Ammonia absorption diffuse reflectance infrared spectroscopy was used to investigate the characteristics of the surface acidity of montmorillonite under different pretreatment temperatures by means of spectrum fitting and spectrum analysis. The reason for the change was also analyzed. The results showed that the montmorillonite after low temperature heat treatment increased the amount of B acid and L acid; the sample calcined at higher temperature (400,600 ℃), the interlayer spacing decreased sharply, the ammonia molecule was difficult to enter the interlayer and acid sites When the reaction occurs, both amounts of acid detectable will decrease.