Y型分子筛表面酸性的DSC和IR测定

Detection of the Surface Acidity of Zeolite Y by DSC and IR

用 DSC法和 IR法对 Y型分子筛的表面酸性进行了研究。分别测定了预吸附 NH3 和三乙胺的 Na Y型和 HY型分子筛的 DSC曲线和摩尔解吸焓。 HY型分子筛的摩尔解吸焓大于 Na Y型分子筛。 IR图谱显示随着 Y型分子筛中硅铝比的增加 ,其骨架反对称伸缩振动频率向高频移动。不同阳离子 ,其羟基振动频率吸收峰也不相同。

The surface acidity of zeolite Y was studied by differential scanning calorimetry(DSC)and infrared spectroscopy(IR). The molar desorption enthalpies of NH 3 or triethylamine(TEA)on H zeolite were larger than those on Na zeolite. increasing the silica alumina ratio of zeolite Y, the asymmetric stretching vibration of the zeolite framework shifted to higher frequency.