Accession Number : AD0693136

Title :   THE CO/CO2 AND CO ELECTRODES IN MOLTEN CARBONATES.

Descriptive Note : Technical rept.,

Corporate Author : RENSSELAER POLYTECHNIC INST TROY N Y DEPT OF CHEMISTRY

Personal Author(s) : Lorenz,P. K. ; Janz,G. J.

Report Date : SEP 1969

Pagination or Media Count : 30

Abstract : The potentials of cells Au/CO,CO2/ CO3(-2)/CO2, O2/Pt and Au/CO/ CO3(-2)/CO2,O2/Pt have been determined in the ternary eutectic Li2CO3 - K2CO3 between 510 and 800C. At 800C the potential resulting from the Au/CO,CO2/ CO3(-2)/CO2,O2/Pt cell indicated that the reaction occurring at the Au electrode was CO3(-2) + CO - 2e = 2CO2. At 700C and lower, the cell potential confirmed that the reaction CO3(-2) + C - 2e = CO2 + CO dominates the high CO partial pressure range. At lower temperatures the reaction CO + 2OH(-) = CO3(-2) + H2 was observed to proceed to the right, consuming part of the incoming CO stream so that the cell potential appeared to deviate from the Nernst slope (corresponding to the reaction CO3(-2) + CO - 2e = 2CO2). The Nernst slopes and cell potentials follow the thermodynamic prediction for the electrochemical reactions occurring at the Au electrode. At low CO flow rates over the entire temperature range, and at all flow rates at higher temperatures the cell potential differed considerably from the predictions for the above reaction. The reaction CO3(-2) + 2H2 - 2e = CO + 2H2O is seen as a possible explanation for this behavior. (Author)

Descriptors :   (*CARBONATES, *ELECTROLYTES), (*CARBON MONOXIDE, *ELECTROCHEMISTRY), (*CARBON DIOXIDE, ELECTROCHEMISTRY), ALKALI METAL COMPOUNDS, THERMODYNAMICS, FUEL CELLS, ELECTRODES, CONTROLLED ATMOSPHERES

Subject Categories : Physical Chemistry
      Electric Power Production and Distribution

Distribution Statement : APPROVED FOR PUBLIC RELEASE