Determination of standard Gibbs energy change for CO + 12O2 = CO2 using an electrochemical pump and gauge

A. CANEIRO; J. FOULETIER; M. KLEITZ

JOURNAL OF CHEMICAL THERMODYNAMICS

ACADEMIC PRESS LTD-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 1981 vol. 13 p. 823 - 832

0021-9614

The standard Gibbs energy change of the reaction: CO + 1 2O2 = CO2 was determined from an electrochemical reduction of pure carbon dioxide to carbon monoxide in the temperature range 970 to 1270 K. The equilibrium oxygen pressure in the flowing gas was controlled using an electrochemical pump and measured with a zirconia gauge. By using the Faraday's-law test, the temperature and oxygen pressure ranges where no side-reactions take place were determined. The sources of error associated with the solid electrolyte cells were evaluated. The standard Gibbs energy change is ?Go(T)/kJ mol-1 = -283.328+0.08753( solT K); the uncertainty in ?Go is less than 250 J mol-1. The enthalpy variation at 298.15 K obtained using the third-law method, is -(282.99±0.32) kJ mol-1.