Abstract
Changes in the framework of an ethanol-ZSM-5 type zeolite by thermal effects between 673 and 1173 K were investigated using the methods of thermal analysis, infrared, X-ray diffraction and scanning electron microscopy. Crystalline transformation of ZSM-5 into cristobalite at about 973 K was observed in either an air or nitrogen stream and using different heating programmes. The breakdown of the lattice is related to the thermal removal of some species of ethanol from the framework. Total removal of the organic promoter by washing with water prior to thermal treatment leads to a material in which the phase transition temperature is above 1173 K.
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