Phase transition in niobium pentoxide supported on silica-alumina
作者： V. S. Braga , F. A. C. Garcia , J. A. Dias , Sílvia C. L. Dias
DOI: 10.1007/S10973-006-8325-4
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摘要: Nb2O5 supported on SiO2-Al2O3 were prepared with a wide loading range (2, 5, 10, 15, 20 and 25 mass%) analyzed by simultaneous thermogravimetric (TG) differential thermal analysis (DTA). The materials presented phase transition close to 1364°C. This was studied XRD, FTIR Raman spectroscopy. Amixture of orthorhombic (T) andmonoclinic (H andM) crystalline phases evidenced in the samples, which is coverage dependent, contrast formation only monoclinic M) when pure heated under same conditions. These results indicate stabilization silica-alumina surface.
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