~(29)Si MAS-NMR STUDIES ON DEALUMINATION OF MORDENITE

• 作 者: 薛志元 戴林森 李全芝 张红浪
• 机 构: Center of Analysis and Measurement, Fudan University, Shanghai,Center of Analysis and Measurement, F
• 出 处: Science in China,Ser.B
• 发表日期: 1989年09期
• 关键词: calcination aluminium steam leaching bridges spheres overlapping arrangement ads

A series of different H-mordenites from acid leaching and steam calcination have beenmeasured with ~(29)Si NMR. Through analysis of these solid-state ~(29)Si NMR spectra, theresults related to dealumination process of mordenite are obtained. It is shown that mor-denite is combined by four kinds of non-equivalent Si (or Al) via oxygen bridges. The deal-umination order is T(1), T(2), T(4) and T(3). The dealuminated amount in the non-equivalentsites during different dealumination processes has also been discussed in detail.

A series of different H-mordenites from acid leaching and steam calcination have beenmeasured with ~ (29) Si NMR. Through analysis of these solid-state ~ (29) Si NMR spectra, the results related to dealumination process of mordenite are obtained. It is The deal-umination order is T (1), T (2), T (4) and T (3). The dealuminated amount in the non-equivalentsites during different dealumination processes has also been discussed in detail.