Resumo

GARCIA-ALAMILLA, Ricardo et al. EVALUACIÓN DE LA ACIDEZ SUPERFICIAL DE ÓXIDOS DE CIRCONIO MODIFICADOS CON TUNGSTENO Y MOLIBDENO. Rev. Bol. Quim [online]. 2010, vol.27, n.1, pp.1-6. ISSN 0250-5460.

ABSTRACT Circonium hidroxide was prepared by sol-gel method and was impregnated with molibdenum and tungstenum to study thier influence on the acidity, especific surface area and crystalline structure. Ti(OH)4 impregnated with molibdenum was calcined at 400 and 600oC while the material impregnated with tungstenum was calcined at 625oC. The maximun acid stregh was determined by potentiometric titration with n-butylamine, the surface area was determined by nitrogen physisorption and crystalline structure was identified by XRD. The modification of circonia with molybdenum and tungstenum promuve higt surface area stabilized the tetragonal phase and incresed the streng of acid sites. The circonia modified with molibdenum was tested en the isomerization of n-hexane ontaining 22% of conversion and the selectivity was oriented to the 2 and 3 methylpentanes formation

Palavras-chave : circonia; circonia-tugsteno; circonia-molibdeno; isomerización de n-hexano.

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