论文部分内容阅读
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。
V is introduced into the high molecular sieve HM (hydrogen mordenite) and HZSM-5 by the solid ion exchange method. XRD, LRS and BIE show that the V 2 O 5 crystal phase disappears on the surface of HM and HZSM-5, and enters the molecular sieve as VO ion. The pyridine adsorption-IR shows that the VO ions mainly exchange with protons in HM and HZSM-5 zeolites. The two signals of the ESR indicate that isolated VO ions entering the molecular sieve have two different coordination structures: compressed octahedral hexahedral and planar tetragonal pentacoordinated.