Calorimetric and spectroscopic measurements on the SO 2 oxidation catalyst model system M 2S 2O 7–M 2SO 4–V 2O 5/SO 2(g) or Ar(g) (M=K or Cs) at 430–470°C
Calorimetric measurements have been performed on the melt–gas systems M 2S 2O 7–V 2O 5 and M 2S 2O 7–M 2SO 4(sat)–V 2O 5 (M=K and Cs) in SO 2(g) and Ar(g) at 430–480°C and for mole fractions X V 2O 5 =0–0.1. Enthalpies have been obtained for complex formation reactions as (VO) 2O(SO 4) 4 4−+SO 4 2−⇄...
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Published in | Thermochimica acta Vol. 379; no. 1; pp. 187 - 193 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
2001
|
Subjects | |
Online Access | Get full text |
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Summary: | Calorimetric measurements have been performed on the melt–gas systems M
2S
2O
7–V
2O
5 and M
2S
2O
7–M
2SO
4(sat)–V
2O
5 (M=K and Cs) in SO
2(g) and Ar(g) at 430–480°C and for mole fractions
X
V
2O
5
=0–0.1. Enthalpies have been obtained for complex formation reactions as (VO)
2O(SO
4)
4
4−+SO
4
2−⇄2VO
2(SO
4)
2
3−+S
2O
7
2− for V(V) and 2VO(SO
4)
2
2−+3SO
4
2−+SO
3⇄2VO(SO
4)
3
4−+S
2O
7
2− for V(IV). Similarly enthalpies of the V(V)–V(IV) redox reactions (VO)
2O(SO
4)
4
4−+SO
2⇄2VO(SO
4)
2
2−+SO
3 and 2VO
2(SO
4)
2
3−+SO
4
2−+SO
2⇄2VO(SO
4)
3
4− could be calculated. These enthalpies of reduction compare well with those obtained by spectrophotometric measurements in the same temperature range. |
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ISSN: | 0040-6031 1872-762X |
DOI: | 10.1016/S0040-6031(01)00616-5 |