User menu

Accès à distance ? S'identifier sur le proxy UCLouvain

Solubility and solvation of carbon dioxide in the molten Li2CO3/Na2CO3/K2CO3 (43.5 : 31.5 : 25.0 mol-%) eutectic mixture at 973 K I. Experimental part

Primary tabs

Claes, Paul [UCL] Moyaux, D. Peeters, Daniel [UCL]

The solubility of CO2 in the molten ternary eutectic mixture Li2CO3-Na2CO3-K2CO3 (43.5, 31.5, 25.0 mol.%) at 973 K has been determined by a titration technique. From the obtained titration curve, the solubility has been found to amount to 9.5.10(-2) mol.L-1 (sigma = 1.0) under a pressure of CO2 of 1 an and the pK(d) value of the carbonate melt has been evaluated to 5.37 (sigma(5) = 0.24) if the concentrations of the solutes are expressed in mol.L-1. This pK(d) value is in good agreement with literature data but the solubility value reported in this work is much higher than most of those reported in the literature. A chemical dissolution of CO2 as C2O52- is proposed and the consequences of the occurrence of this species on the acidobasic properties of molten carbonates are discussed. It appears from the experimental results that the CO2/C2O52- equilibrium in the carbonate melt is a slow process.

Document type Article de périodique (Journal article) – Article de recherche
Publication date 1999
Language Anglais
Journal information "European Journal of Inorganic Chemistry" - , no. 4, p. 583-588 (1999)
Peer reviewed yes
Publisher Wiley-v C H Verlag Gmbh (Berlin)
issn 1434-1948
e-issn 1099-0682
Publication status Publié
Affiliation UCL
Keywords dicarbonate ion ; autodissociation constant ; electrochemistry ; potentiometric titration ; acidity ; basicity ; anions
Links
  1. Electrochimie analytique et réactions en solution, Tome 1, Masson (Paris, Milan, Barcelone, Bonn) 1993 p. 352.
  2. Andresen, J. Electrochem. Soc., 126, 328 (1979)
  3. Claes, Electrochimica Acta, 41, 141 (1996)
  4. Appleby, J. Electrochem. Soc., 127, 1655 (1996)
  5. Survey of Basic Research on Fuel Cells with Fused Carbonate Electrolytes, Internal Rept. 69–0667/1272–7211, Centraal Technisch Instituut TNO, Appeldoorn, Netherlands, 1969.
  6. , , Ext. Abstr. Nº 77, 28th Mtg. Internat. Soc. Electrochemistry, Vano, Bulgaria, 1977, 2, 313.
  7. Dubois, Ann. Chim., 10, 145 (1965)
  8. White, J. Appl. Electrochemistry, 19, 901 (1965)
  9. Thermodynamic Propereties of molten alkali carbonates, Ph.D. Thesis, Tech. Un. of Denmark, Lingby 1965.
  10. Borucka, J. Electrochem. Soc., 124, 972 (1977)
  11. Vogel, J. Electrochem. Soc., 127, 833 (1980)
  12. Stability and reactivity of oxygen, nickel and cobalt species in molten carbonate, Ph.D. Thesis, Technische Universiteit Delft, 1997.
  13. Moutiers, J. Electroanal. Chem., 324, 175 (1992)
  14. Andanuvor, J. Electrochem. Soc., 137, 209 (1990)
  15. , Proc. Electrochem. Soc. 1986, 86–1, 584.
Bibliographic reference Claes, Paul ; Moyaux, D. ; Peeters, Daniel. Solubility and solvation of carbon dioxide in the molten Li2CO3/Na2CO3/K2CO3 (43.5 : 31.5 : 25.0 mol-%) eutectic mixture at 973 K I. Experimental part. In: European Journal of Inorganic Chemistry, , no. 4, p. 583-588 (1999)
Permanent URL http://hdl.handle.net/2078.1/44548