Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 92, Issue 3, Pages 851-855Publisher
SPRINGER
DOI: 10.1007/s10973-006-8325-4
Keywords
niobium pentoxide; phase transition; silica-alumina; supported catalyst; thermal analysis
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Nb2O5 supported on SiO2-Al2O3 were prepared with a wide loading range (2, 5, 10, 15, 20 and 25 mass%) and analyzed by simultaneous thermogravimetric (TG) and differential thermal analysis (DTA). The materials presented a phase transition close to 1364 degrees C. This phase transition was studied by XRD, FTIR and Raman spectroscopy. A mixture of orthorhombic (T) and monoclinic (H and M) crystalline phases was evidenced in the supported samples, which is coverage dependent, in contrast to the formation of only the monoclinic phase (H and M) when pure Nb2O5 is heated under the same conditions. These results indicate the stabilization of Nb2O5 on silica-alumina surface.
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