Isomerization Of n-Butane Over Fe, Fe-Mn And Ni Promoted Sulfated Zirconia.

ELBA GARCÍA; MARA VOLPE; MARÍA LUJÁN FERREIRA; ELSA RUEDA

LATIN AMERICAN APPLIED RESEARCH

Año: 2005 vol. 35 p. 281 - 287

0327-0793

The isomerization of n-butane was performed over Ni, Fe and Fe-Mn sulfated zirconia. Two preparation methods were employed differing in the sequence of promotion /sulfation steps. At 473K, for both preparation methods, Ni containing samples were the most active. The samples firstly promoted with Fe and Fe-Mn and subsequently sulfated were more active than the similar catalysts for which the promotion was carried out upon sulfation; a close contact between the promoter species and sulfate groups would be the origin of the enhanced activity. At 373 K, an induction period was observed. TPR results indicated that no loss of sulfur takes places and that a sintering of metal promoter species occurs during reaction. The deactivation of samples would be related to coke formation and the blocking of anion vacancies of the zirconia.