The solid state reduction kinetics by carbon monoxide of sodium sulfate mixed with sodium titanate are studied in a thermogravimetric system at 670-750°C. It is found that the reduction of this mixture is much faster than that of pure sodium sulfate. The conversion-time curves of the model mixtures are sigmoidal in shape and well described by the nucleation and growth kinetic model. The activation energy is 420 kJ/mol. The influence of the CO and CO₂, concentration, mass fraction of sodium titanate and addition of sodium sulfide catalyst are investigated. Based on the present experiments and literature results, a mechanism is proposed for the CO reduction.

Abstract

Les cinétiques de réductionà l'état solide par l'oxyde de carbone du sulfate de sodium mélangé à du titanate de sodium ont été étudiées dans un système thermogravimétrique a 670-750°C. On a observé que la reduction de ce melange était beaucoup plus rapide que pour le sulfate de sodium pur. Les courbes de temps de conversion des mélanges du modèle sont de forme sigmoïdale et sont bien décrites par le modèle de nuclétion et de cinétique de croissance. L'énergie d'activation est de 420 kJ/mol. On a également étudié l'influence de la concentration en CO et en CO₂, de la fraction massique de titanate de sodium et de l'addition d'un catalyseur de sulfure de sodium. A partir de ces experiences et des résultats de la littérature scientifique, un mécanisme de réduction du CO est proposé.

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Volume71, Issue6

December 1993

Pages 892-900

Carbon monoxide reduction of sodium sulfate mixed with sodium titanate

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