Adsorption of SO2 on alumina |
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Authors: | P Fellner J Jurišová V Khandl A Sýkorová J Thonstad |
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Institution: | (1) Department of Inorganic Technology, Faculty of Chemical and Food Technology, Slovak University of Technology, SK-812 37 Bratislava, Slovakia;(2) Department of Materials Science and Engineering, Norwegian University of Science and Technology, N-7491 Trondheim, Norway |
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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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Keywords: | adsorption equilibrium sulphur dioxide alumina Langmuir isotherm Freundlich isotherm |
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