固体离子交换法将钒引入高硅分子筛  

INTRODUCTION OF VANADIUM INTO HIGH-SILICA ZEOLITES BY SOLID-STATE ION EXCHANGE

作　　者：单绍纯[1] 沈少波[1] 黄敏明[1] 

机构地区：[1]中国科学技术大学近代化学系,合肥230026

出　　处：《物理化学学报》1992年第3期339-344,共6页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金

摘　　要：通过固体离子交换方法将V引入高硅分子筛HM(氢型丝光沸石)和HZSM-5中。XRD、LRS和BIE表明V_2O_5晶相在HM和HZSM-5表面上消失,并以VO离子形式进入分子筛。吡啶吸附-IR表明VO离子主要与HM、HZSM-5分子筛中的质子发生交换。ESR的两个信号表明进入分子筛的孤立VO离子具有两种不同的配位结构:压缩的八面体六配位和平面四方锥五配位。Vanadium has been introduced into high-silica zeolites by heating the physical mixture of V_2O_5 and H-Mordenite or H-ZSM-5 in an airflow containing water vapor.XRD,LRS,BIE and FTIR results suggest that ion exchange occurs between protonsof zeolite and the (VO)^(3+) formed during preparation. ESR results show these are twodifferent coordination structures for the vanadyl species entered into HM or H-ZSM-5,i.e. The compressed hexacoordinated octahedral and the pentacoordinated with pyra-midic symmetry.

关 键 词：固体离子交换 分子筛 五氧化二钒 

分 类 号：TQ424.25[化学工程]