Abstract
The thermal stability of zeolite beta has been studied by 129Xe NMR and adsorption isotherm of adsorbed xenon in correlation with data from X-ray diffraction and 27Al magic-angle-spinning NMR experiments. Samples subject to different calcination and dehydration conditions were examined. Minor destruction of the crystalline framework resulting from dealumination processes has been found for samples treated at a temperature as small as 400°C. At higher temperatures, a severe process of dealumination involving the breaking of 12-membered rings leads to the conclusion that the maximum regeneration temperature of zeofite beta lies near 760°C.
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