Resumo

CHARRY, Iran David; GONZALEZ, Lina María  e  MONTES DE CORREA, Consuelo. Characterization by temperature programmed techniques of spent and acid treated vanadium catalysts. Rev.fac.ing.univ. Antioquia [online]. 2011, n.57, pp.31-37. ISSN 0120-6230.

Spent samples of V₂O₅/SiO₂-γAl₂O₃ catalyst used for H₂SO₄ production were acid treated to recover vanadium. Fresh, spent, and acid treated samples were characterized by temperature-programmed techniques: TPR-H₂, TPO-O₂, TPD-NH₃ and, TGA-DTA in order to determine the effect of deactivating species on vanadium recovery. DRX and UV-Vis techniques were used to confirm several signals from the temperature-programmed profiles. The results suggest that vanadium sulfovanadates and oxides in treated samples strongly interact with the support making it difficult to get more than 86% vanadium recovery.

Palavras-chave : V₂O₅ catalyst; catalyst deactivation; vanadium recovery; sulfovanadate species; temperature-programmed techniques.

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