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Información tecnológica

versão On-line ISSN 0718-0764

Resumo

HERNANDEZ, Isaías; CONTRERAS, José L; CASTRO, Javier J  e  SUAREZ, Raúl. Oxidation of Phenol with CuO/Al2O3, CuO/ZnAl2O4  and CuO-ZnO-AlxOy  Catalysts. Inf. tecnol. [online]. 2006, vol.17, n.5, pp.55-62. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642006000500009.

Fenol in industrial residual water was oxidized catalytically with O2 in a batch reactor. For this purpose, three series of catalysts were evaluated which were prepared by impregnation of Cu(NO)2 on Al2O3, on ZnAl2O4 and by precipitation of nitrates of Cu, Zn and Al. They were characterized by x-ray diffraction, atomic absorption, electronic microscopy, adsorption of N2 and temperature programmed reduction. CuO very dispersed was observed on the surface of all the catalysts. It was found an amorphous phase in the Al2O3 supported catalysts with high surface area and in the other ones it was crystalline with low areas. The highest reaction rate was obtained for the massive catalyst with 22% of Cu. The maximum of reaction rate for all the catalysts was near to 20% of Cu. During the reaction it was produced oxygenated organic compounds which increased the acidity of the residual water, which attacked the surface of the catalysts dissolving a small amount of Cu,Zn and Al.

Palavras-chave : Oxidation; phenol; catalysts; CuO/ZnAl2O4; CuO-ZnO-AlxOy.

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