Abstract
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.
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