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RESEARCH PAPERS

Effect of Various Electrolyte Compositions on the NiO Degradation in Molten Carbonates

[+] Author and Article Information
Silvera Scaccia

 IDROCOMB, Hydrogen and Fuel Cells Project, ENEA, C.R. Casaccia V. Anguillarese 301, I-00060, Rome, Italysilvera@casaccia.enea.it

Stefano Frangini

 IDROCOMB, Hydrogen and Fuel Cells Project, ENEA, C.R. Casaccia V. Anguillarese 301, I-00060, Rome, Italy

J. Fuel Cell Sci. Technol 3(2), 208-212 (Nov 29, 2005) (5 pages) doi:10.1115/1.2174071 History: Received September 09, 2005; Revised November 29, 2005

In the present paper we report the NiO solubility in a variety of alkali carbonate compositions in the presence of MgO, CaCO3, BaCO3, and La2O3 additions under different conditions of gas composition and temperature. Two types of binary eutectic melts were chosen, namely, the standard electrolyte (62-38) (Li-K)2CO3 and (52–48)% (Li-Na)2CO3 mixtures. The ternary eutectic melt chosen was (43.5-31.5-25.0)mol%(Li-Na-K)2CO3. The observed reduction of NiO solubility induced by the additives can be explained in terms of a higher basic character of all the modified electrolytes, although the NiO dissolution still follows an acidic dissolution mechanism in all the conditions under study.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 3

Time-dependence of NiO solubilities in binary and ternary eutectic melts containing 3mol%MgO: (•)(62+38)mol%(Li-K)CO3, (∎) (52+48)mol%(Li-Na)CO3, and (▴)(43.5+31.5+25.0)mol%(Li-Na-K)CO3. Temperature 923K. Atmosphere: PO2∕PCO2=33∕67.

Grahic Jump Location
Figure 4

Time-dependence NiO solubility in (52+48)mol%(Li-Na)CO3 containing 3mol%(CaCO3+BaCO3)(•) and 0.5mol%La2O3 (∎), respectively. Temperature 923K. Atmosphere: PO2∕PCO2=33∕67.

Grahic Jump Location
Figure 5

NiO solubilities in binary eutectic Li-Na melts as a function of temperature inverse: (•)(52+48)mol%(Li-Na)CO3; (∎) 3mol%MgO-containing (52+48)mol%(Li-Na)CO3; and (▴)0.5mol%La2O3-containing (52+48)mol%(Li-Na)CO3. Atmosphere: PO2∕PCO2=33∕67.

Grahic Jump Location
Figure 2

NiO solubilities in binary and ternary eutectic melts as a function of PCO2: (•)(62+38)mol%(Li-K)CO3; (∎) (52+48)mol%(Li-Na)CO3; and (▴)(43.5+31.5+25.0)mol%(Li-Na-K)CO3. Temperature 923K. Atmosphere: PO2=15kPa balanced with Ar.

Grahic Jump Location
Figure 1

Time-dependence of NiO solubility in binary and ternary eutectic melts: (•)(62+38)mol%(Li-K)CO3; (∎) (52+48)mol%(Li-Na)CO3; and (▴)(43.5+31.5+25.0)mol%(Li-Na-K)CO3. Temperature 923K. Atmosphere: PO2∕PCO2=33∕67.

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