【摘要】 用高温水蒸气结合酸洗的方法制备了SiO₂/Al₂O₃为16～186的脱铝丝光沸石。用X光衍射和红外光谱法研究了它们的结构持征。随丝光沸石脱铝,晶格参数呈非线性和各向不同步收缩。由于α方向发生明显收缩,使椭园形主孔道的长轴方向缩小。其骨架振动频率自600～1300cm^-1随着脱铝明显向高频方向漂移。当Al/u.c.自4脱至3时,丝光沸石的结构特征发生了明显的变化,可能与骨架上2位铝的脱除有关。当Al/u.c.≤3时,有新的Si—O—Si骨架生成,同时晶体重排为均匀有序的结构。更多还原

【Abstract】 The dealuminized mordenites with SiO2/Al2O3 in the range from 16 to 186 were prepared by the method of steam with acid leaching. Their structure characteristic was studied by X-ray diffraction and IR. The lattice parameters exhibit a nonlinearity and a pronounced anisotropy with the degree of dealumination. Since parameter "a" is obviously contracted, it makes the long axis of elliptical main channel of mordenite contracted.The vibration frequencies of zeolite framework at 600-1 300cm-1 shifted to higher frequencies with dealumination. As Al/u.c. was changed from 4 to 3, the obvious change of the structure charactetistic occurred with the dealumination , it is probably related to the removal of the aluminum atoms of position "2" from the framework. When Al/u.c.≤3, the new Si-O-Si framework was formed and it was rearranged to a more orderly structure.更多还原