Resumo

AGAMEZ PERTUZ, Yazmin Yaneth et al. MODIFICATIONS OF THE TEXTURAL AND STRUCTURAL PROPERTIES OF ZEOLITE USY AND ITS MIXTURE WITH KAOLIN CLAY AND CHLORHYDROL AS CONSEQUENCE OF THE HYDROTHERMAL TREATMENT. Rev.Colomb.Quim. [online]. 2006, vol.35, n.1, pp.7-17. ISSN 0120-2804.

FCC catalyst is made up of particles of complex composition where the main active component is a Y zeolite. This work presents the textural and structural results of a commercial USY zeolite which had been previously prepared from a set of catalysts with 7, 15, 25, 35 y 45% of active material and of the hydrothermally deactivated materials zeolite. The samples have been characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), 29Si NMR spectroscopy and nitrogen adsorption at 77K. From these results was found correlations between micropore volume and zeolite content and degree crystallinity and %zeolite. Also, it was found that an hydrothermal treatment at 1033 K with only 20% steam during 16 hours destroys the structural groups Si(2Al) and Si(3Al) as a reflection of the strongly dealumination of the zeolite component of the catalyst.

Palavras-chave : USY zeolite; hydrothermal treatment; texture; micropore volume; structure; crystallinity.

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