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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/5252

Title: Phase transition in niobium pentoxide supported on silica-alumina
Other Titles: Journal of Thermal Analysis and Calorimetry
Authors: Braga, Valdeilson Souza
Garcia, Fillipe Augusto da Costa
Dias, José Alves
Dias, Sílvia Cláudia Loureiro
Keywords: niobium pentoxide;phase transition;silica-alumina;supported catalyst;thermal analysis
Issue Date: 2008
Abstract: 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°C. This phase transition was studied by XRD, FTIR and Raman spectroscopy. Amixture of orthorhombic (T) andmonoclinic (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.
Description: p. 851–855
URI: http://www.repositorio.ufba.br/ri/handle/ri/5252
ISSN: 1572-8943
Appears in Collections:Artigos Publicados em Periódicos (ICADS)

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