Thermogravimetric, mass spectrometric and XPS investigation on the chlorination reactions of V2O5 AND TiO2

G. Mink, I. Bertóti, I. S. Pap, T. Székely, C. Battistoni, E. Karmazsin

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Abstract

Comparative studies on the kinetics and mechanism of the chlorination of V2O5 and TiO2 /anatase/ with CCl4 have been performed. The chlorination of V2O5 occurred to be O.5 order in CCl4, whereas in case of TiO2 closely first order kinetics was observed with apparent activation energies of 77 ± 5 and 118 ± 7 kJ.mol-1, resp. In both cases a dissociative adsorption of CCl4 is considered to precede the reaction and the transformation of CCl4 to CO2 is assumed to occur via the formation of adsorbed COCl2 intermediate. In case of V2O5, phosgene is less reactive than CCl4, so during the chlorination of V2O5 by CCl4 the gas phase concentration of COCl2 might achieve a considerable level, while in the TiO2CCl4 system only trace quantities of phosgene are observable. At the beginning of the reactions step by step exchange of surface O by Cl occurs, and the surface intermediates of the chlorination are V and Ti ions of lowered valence state, as it has been characterized by ESCA.

Original languageEnglish
Pages (from-to)83-86
Number of pages4
JournalThermochimica Acta
Volume85
Issue numberC
DOIs
Publication statusPublished - Apr 1 1985

Fingerprint

chlorination
Chlorination
X ray photoelectron spectroscopy
Phosgene
phosgene
Kinetics
kinetics
anatase
Titanium dioxide
Activation energy
Gases
Ions
vapor phases
activation energy
valence
Adsorption
adsorption
vanadium pentoxide
ions

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Physical and Theoretical Chemistry

Cite this

Thermogravimetric, mass spectrometric and XPS investigation on the chlorination reactions of V2O5 AND TiO2. / Mink, G.; Bertóti, I.; Pap, I. S.; Székely, T.; Battistoni, C.; Karmazsin, E.

In: Thermochimica Acta, Vol. 85, No. C, 01.04.1985, p. 83-86.

Research output: Contribution to journalArticle

Mink, G. ; Bertóti, I. ; Pap, I. S. ; Székely, T. ; Battistoni, C. ; Karmazsin, E. / Thermogravimetric, mass spectrometric and XPS investigation on the chlorination reactions of V2O5 AND TiO2. In: Thermochimica Acta. 1985 ; Vol. 85, No. C. pp. 83-86.
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