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<abstract language="eng">Protonic offretite samples were modified by gamma-irradiation under different conditions of humidity. The results of infrared spectroscopy and X-ray diffraction reveal that the presence of water is essential to promote dealumination, as the samples irradiated in vacuum only show crystallinity loss. The degree of dealumination is, mainly, controlled by the gamma-irradiation dose while the textural modifications depend also on the percentage of water

Desaluminação do zeólito ofretita por efeito da radiação gama