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https://repositorio.ufba.br/handle/ri/5252| metadata.dc.type: | Artigo de Periódico |
| 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 |
| metadata.dc.creator: | Braga, Valdeilson Souza Garcia, Fillipe Augusto da Costa Dias, José Alves Dias, Sílvia Cláudia Loureiro |
| 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. |
| Keywords: | niobium pentoxide phase transition silica-alumina supported catalyst thermal analysis |
| URI: | http://www.repositorio.ufba.br/ri/handle/ri/5252 |
| Issue Date: | 2008 |
| Appears in Collections: | Artigo Publicado em Periódico (ICADS) |
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