Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 92: Issue 3
Phase transition in niobium pentoxide supported on silica-alumina
Authors:
V. Braga Instituto de Ciências Ambientais e Desenvolvimento Sustentável (ICADS) Rua Professor José Seabra S/N Universidade Federal da Bahia (UFBA) Barreiras-BA 47805-100 Brazil

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F. Garcia Universidade de Brasília, Instituto de Química, Laboratório de Catálise caixa postal 04478 Brasília-DF 70904-970 Brazil

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J. Dias Universidade de Brasília, Instituto de Química, Laboratório de Catálise caixa postal 04478 Brasília-DF 70904-970 Brazil

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Sílvia Dias Universidade de Brasília, Instituto de Química, Laboratório de Catálise caixa postal 04478 Brasília-DF 70904-970 Brazil

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Pages:
851–855
Online Publication Date:
02 Jul 2008
Publication Date:
01 Jun 2008
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-006-8325-4
Keywords:
niobium pentoxide; phase transition; silica-alumina; supported catalyst; thermal analysis
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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 andM) 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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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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