核磁共振法表征磷改性斜发沸石骨架硅铝的变化  

The Characterization of Silicon and Aluminum Content in the Framework of Phosphorus Modified Clinoptilolites by^(27)Al,^(29)Si,^(31)P MAS NMR

作　　者：吴瑞凤[1] 李曼尼[1] 施和平[1] 

机构地区：[1]内蒙古大学化学化工学院

出　　处：《内蒙古大学学报（自然科学版）》2003年第4期462-467,共6页Journal of Inner Mongolia University：Natural Science Edition

基　　金：国家自然科学基金资助项目(29867001)

摘　　要：用固固相P-Al同晶取代的方法,采用焙烧和微波两种加热方式磷改性斜发沸石,并用27Al、29Si和31P高分辨MASNMR表征磷改性前后斜发沸石骨架上的硅铝变化.结果表明,两种方法都能使沸石骨架Al脱除,形成八面体Al(H2O)3+6,骨架硅铝比显著增大,微波法对斜发沸石骨架P-Al同晶取代效果比焙烧法好.同时,两种方法对磷改性斜发沸石的骨架结构影响也不同.Clinoptilolite is modified by the calcination and microwave irradiation methods with solidsolid isomorphous substitution of P2O5 as a modified agent.The change of silicon and aluminum contents in the framework of phosphorus modified clinoptilolites is characterized by27Al, 29Si,31P MAS NMR.The results show that dealumination in the framework is taken place in the two modified clinoptilolites,which are translated to octahedrally coordinated aquated alumina Al(H2O)3+6.The ratio of silicon and aluminum in the framework (Si/Al)B increases obviously.Phosphorus isomorphous substitution for aluminum in the framework by the wicrowave irradiation method is better than the calcination.Also,the influence on the structure of clinoptilolite′s framework is different in the two phosphorus modified methods.

关 键 词：磷改性斜发沸石 MASNMR表征 骨架硅铝比 

分 类 号：TQ424.23[化学工程]