热处理Sn^(4+)阳离子交换天然沸石的研究  

A STUDY ON Sn^(4+) CATION EXCHANGE NATURAL ZEOLITE TREATED AT DIFFERENT TEMPERATURES

作　　者：吴詠华 李惠祥[1] 王大志[2] 张道元[3] 

机构地区：[1]中国科学技术大学基础物理中心,合肥230026 [2]中国科学技术大学材料科学与工程系 [3]中国科学技术大学物理系

出　　处：《物理学报》1992年第7期1208-1212,共5页Acta Physica Sinica

摘　　要：用SnCl_4对天然丝光沸石进行阳离子交换,得到Sn^(4+)沸石,经70—1000℃温度范围内热处理后,用Mssbauer谱、X射线衍射、红外吸收光谱研究Sn^(4+)阳离子在沸石结构中位置随温度的变化,给出Sn^(4+)阳离子处在沸石骨架结构的主孔道内。随着热处理温度升高,沸石水逐渐脱出,Sn^(4+)阳离子从主孔道中央移向侧壁,相应的四极分裂值随温度升高而增大,同时以SnO_2形态存在的成分含量随温度升高而增加。达到1000℃时沸石的长程有序结构已被破坏。The samples of Sn4+ zeolite are obtained by cation exchange between natural zeolite and SnCl4, and then treated at different Temperatures (70-1000℃). By using Mossbauer spectroscopy, X-ray diffraction and infra-red spectroscopy, we studied the change of position of Sn4+ in the zeolite structure with the temperature. The results show that the Sn4+ is situated in the main duct (channel) of the zeolite structure, but with the increase of the temperature the zeolite is dehydrated gradually, then the Sn4+ begins to move from the center of the duct to the walls of the duct, consequently, owing to the increase of the asymmetry of the electric field where the Sn4+ is situated, the quadruple splitting increases with the increase of the temperature. At the same time the SnO2 component increases with the increase of temperature. When heat-treatment temperature reached 1000℃ the long range order structure of zeolite may be destroyed completely.

关 键 词：热处理 阳离子交换 沸石 吸附剂 

分 类 号：O647.33[理学—物理化学]