Structural vibrations of acid-leached mordenites

Abstract

A series of dealuminated mordenites has been studied by infrared structural spectroscopy. Linear correlations were found between the wavenumber and the relative absorbance of one specific skeletal vibration and the structural aluminium content as determined by ²⁷Al m.a.s.n.m.r. spectroscopy. Based on these results this vibration is identified as an Al—O structural vibration. With the obtained set of linear equations it is possible to determine the structural aluminium content of acid-leached mordenites by infrared structural spectroscopy. At the same time, qualitative information concerning changes in bond strength and structure upon dealumination could be obtained.