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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/19030
Title: 
V2O5/TiO2 catalyst xerogels: Method of preparation and characterization
Author(s): 
Institution: 
  • Universidade Estadual Paulista (UNESP)
  • Universidade de São Paulo (USP)
  • Inst Neue Mat
ISSN: 
0928-0707
Abstract: 
This work describes a modified sol-gel method for the preparation of V2O5/TiO2 catalysts. The samples have been characterized by N-2 adsorption at 77 K, X-ray Diffractometry (XRD), Scanning Electronic Microscopy (SEM/EDX) and Fourier Transform Infrared Spectroscopy (FT-IR). The surface area increases with the vanadia loading from 24 m(2) g(-1) for pure TiO2 to 87 m(2) g(-1) for 9 wt% of V2O5. The rutile form is predominant for pure TiO2 but becomes enriched with anatase phase when vanadia loading is increased. No crystalline V2O5 phase was observed in the diffractograms of the catalysts. Analysis by SEM showed heterogeneous granulation of particles with high vanadium dispersion. Two species of surface vanadium were observed by FT-IR spectroscopy: a monomeric vanadyl and polymeric vanadates. The vanadyl/vanadate ratio remains practically constant. Ethanol oxidation was used as a catalytic test in a temperature range from 350 to 560 K. The catalytic activity starts around 380 K. For the sample with 9 wt% of vanadia, the conversion of ethanol into acetaldehyde as the main product was approximately 90% at 473 K.
Issue Date: 
1-Aug-2002
Citation: 
Journal of Sol-gel Science and Technology. Dordrecht: Kluwer Academic Publ, v. 25, n. 1, p. 75-82, 2002.
Time Duration: 
75-82
Publisher: 
Kluwer Academic Publ
Keywords: 
  • sol-gel
  • vanadium and titanium oxide
  • catalyst
  • ethanol oxidation
Source: 
http://dx.doi.org/10.1023/A:1016097128696
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/19030
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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