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用X射线衍射、X光荧光,差热分析、魔角自旋核磁共振及正己烷吸附测定了三种硅铝比的丝光沸石与它们的不同深度脱铝物的物化性质。丝光沸石无论脱铝与否,都有较好的热稳定性,结构发生显著变化的温度均在1000℃以上。丝光沸石在合宜条件下脱铝约50％时,能基本保持原有结构,但XRD结果表明,特征衍射峰的位置和强度有改变。丝光沸石的骨架铝脱除后,在该处留下隔离的空位,表现为正己烷的吸附量的增加。正己烷吸附量与脱铝空位数以及未脱铝丝光沸石的硅铝比有正比关系。
The physico-chemical properties of three mordenite with different Si / Al ratio and the dealumination of different depths were determined by X-ray diffraction, X-ray fluorescence, DTA, magic angle spin nuclear magnetic resonance and hexane adsorption. Mordenite regardless of dealumination or not, have better thermal stability, significant changes in the structure of the structure are above 1000 ℃. When the mordenite was dealt with about 50% aluminum under the proper conditions, the original structure was basically maintained, but the XRD results showed that the position and intensity of the characteristic diffraction peak were changed. After the removal of the mordenite framework aluminum leaves an isolated vacancy therein, showing an increase in the amount of n-hexane adsorbed. The amount of n-hexane adsorbed is proportional to the number of dealuminated vacancies and the ratio of Si / Al of the dealuminated mordenite.