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以碱式MgCO_3为原料在不同温度下焙烧制成轻烧MgO,使其与苯甲酸反应后进行FTIR-PAS测定。所得谱图与苯甲酸的钾、钠、镁盐作了比较。结果表明,苯甲酸与轻烧MgO表面层发生了化学作用,并以苯甲酸镁盐的形式存在于MgO的表层。该表层有Lewis酸点(荷正电的Mg~(2+))。与苯甲酸反应后的轻烧MgO的IR谱中的1529cm~(-1)吸收峰的变化与轻烧MgO的烧结活性相对应。670cm~(-1)吸收峰随MgO表面酸强度的增加而加强。轻烧Mgo表面酸碱强度分布均匀时,烧结性能最好。
The basic MgCO_3 was calcined at different temperatures to make light-burned MgO, which was reacted with benzoic acid to make FTIR-PAS determination. The resulting spectra were compared with the potassium, sodium, and magnesium salts of benzoic acid. The results show that benzoic acid and light burned MgO surface layer chemical role, and in the form of magnesium benzoate in the MgO surface layer. The surface has Lewis acid sites (positively charged Mg ~ (2+)). The change of 1529cm -1 in the IR spectrum of the light burned MgO after reaction with benzoic acid corresponds to the sintering activity of the light burned MgO. The absorption peak at 670cm ~ (-1) increases with the increase of acid strength of MgO surface. Light burning Mgo surface acid-base strength distribution, the best sintering performance.