Infrared study of CO2 adsorption on haematite

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This work has shown that CO2 molecules can interact at b.t. with high surface α-Fe2O3 obtained by thermal decomposition of goethite giving: a) physisorption, possibly via charge transfer mechanism between the carbon atom and the oxygen of a surface hydroxyl; b) formation of both monodentate and bidentate carbonate ions which can be easily decomposed by degassing even at b.t.. More severe conditions of contact allow the progressive formation of Fe2O2CO3 layers thermally stable up to 400°C which can be identified through their characteristic IR absorptions. © 1980.

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