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Adsorption of SO2 on alumina

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Abstract

The adsorption of SO2 on alumina used in the aluminium industry, the so-called smelter-grade alumina, was studied in the temperature range 15–120°C. It was found that at temperatures lower than 40°C, sulphur dioxide was bonded to alumina reversibly by physical forces, and the adsorption could be described satisfactorily by the Langmuir adsorption isotherm. The heat of adsorption was estimated to be −33 kJ mol−1. At temperatures ranging from 80°C to 120°C, which prevail in dry scrubbers in the aluminium industry, the heat of adsorption was determined to be −56 kJ mol−1. When SO2 was adsorbed at temperatures higher than 80°C, about 30 % of the SO2 could not be desorbed even if the samples were heated up to 250°C. In the presence of SO2 and oxygen, the formation of sulphate was observed at temperatures above 90°C.

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Authors and Affiliations

  1. Department of Inorganic Technology, Faculty of Chemical and Food Technology, Slovak University of Technology, SK-812 37, Bratislava, Slovakia

    P. Fellner, J. Jurišová, V. Khandl & A. Sýkorová

  2. Department of Materials Science and Engineering, Norwegian University of Science and Technology, N-7491, Trondheim, Norway

    J. Thonstad

Authors
  1. P. Fellner
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  2. J. Jurišová
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  3. V. Khandl
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  4. A. Sýkorová
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  5. J. Thonstad
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Fellner, P., Jurišová, J., Khandl, V. et al. Adsorption of SO2 on alumina. Chem. Pap. 60, 311–314 (2006). https://doi.org/10.2478/s11696-006-0055-3

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  • DOI: https://doi.org/10.2478/s11696-006-0055-3

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