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Formation of cereous sulphate phase upon interaction of So2 with ceria at room temperature

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Abstract

The adsorption of SO2 gas on ceria solid at room temperature has been investigated by thermal analysis, Raman spectroscopy and electron paramagnetic resonance (EPR). The results confirm that SO2 transformation into sulphate species occurs at 25°C with a concomitant reduction of Ce4+ to Ce3+ ions. The formation of Ce(III)-sulphate phase has been evidenced on ceria surface. The thermal analysis revealed a complete decomposition of cereous sulphate phase to CeO2 at 785°C. The change of oxidation state of Ce(IV) to Ce(III) during the formation of sulphate phase has been confirmed also by EPR technique.

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Authors and Affiliations

  1. Laboratoire de Catalyse et Environnement E.A. 2598, MREID, Université du Littoral Côte d'Opale, MREID, 145 avenue Maurice Schumann, 59140, Dunkerque, France

    R. Flouty, E. Abi-Aad, S. Siffert & A. Aboukaïs

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  1. R. Flouty
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  2. E. Abi-Aad
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  3. S. Siffert
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  4. A. Aboukaïs
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Flouty, R., Abi-Aad, E., Siffert, S. et al. Formation of cereous sulphate phase upon interaction of So2 with ceria at room temperature. Journal of Thermal Analysis and Calorimetry 73, 727–734 (2003). https://doi.org/10.1023/A:1025818127541

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