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BIBTEX RIS

Preparo de óxido de nióbio suportado em alumina por deposição química em fase vapor: caracterização por espectroscopia vibracional e termogravimetria

1998; Brazilian Chemical Society; Volume: 21; Issue: 2 Linguagem: Inglês

10.1590/s0100-40421998000200010

ISSN

1678-7064

Autores

Carmen Lúcia T. da Silva, José Luiz Zotin, V CAMORIM, Arnaldo C. Faro, Maria Luiza M. Rocco,

Tópico(s)

Catalysis and Oxidation Reactions

Resumo

THERMOGRAVIMETRIC ANALYSIS.Alumina supported niobium oxide was prepared by chemical vapor deposition (CVD) of NbCl 5 .The alumina was calcined and pretreated at differents temperatures in order to vary the density of OH groups on the surface which was determined by thermogravimetric analysis.A good correlation was found between the amount of anchored niobium and the total number of anionic sites (oxide and hydroxyl groups) on the surface of the alumina.The infrared spectra on the OH stretching region indicate that OH groups coordinated to at least one tetrahedral aluminum were more reactive towards NbCl 5 .

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