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Adsorption of SO2 onto oxidized and heat-treated activated carbon fibers (ACFs).pdf

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Adsorption of SO2 onto oxidized and heat-treated activated carbon fibers (ACFs)

Pergamon PII: WOOS-6223(96)00163-7 Carbon Vol. 35, No. 3, pp. 41 l-417, 1997 Copyright 0 1997 Elsevier Science Ltd Printed in Great Britain. All rights reserved 000%6223/97 $17.00 + 0.00 ADSORPTION OF SO2 ONTO OXIDIZED AND HEAT- TREATED ACTIVATED CARBON FIBERS (ACFS) M. A. DALEY,’ C. L. MANGUN,~‘* J. A. DEBARR,~‘~ S. RIHA,~ A. A. LIZZIO,~ G. L. DONNALS~ and J. ECONOMY~ “1304 W. Green Street, Department of Materials Science and Engineering, University of Illinois, Urbana, IL 61801, U.S.A. %linois State Geological Survey, 615 E. Peabody Drive, Champaign, IL 61820, U.S.A. ‘Department of Environmental Engineering, Urbana, IL 61801, U.S.A. (Received 21 August 1996; accepted in revised form 30 October 1996) Abstract-A series of activated carbon fibers (ACFs) and heat-treated oxidized ACFs prepared from phenolic fiber precursors have been studied to elucidate the role of pore size, pore surface chemistry and pore volume for the adsorption of SO, and its catalytic conversion to HZSOI. For untreated ACFs, the initial rate of SO, adsorption from flue gas was shown to be inversely related to pore size. At longer times, the amount of SO, adsorbed from flue gas was dependent on both the pore size and pore volume. Oxidation of the ACFs, using an aqueous oxidant, decreased their adsorption capacity for SO, from flue gas due to a decrease in pore volume and repulsion of the SO, from acidic surface groups. If these samples were heat-treated to desorb the oxygen containing function groups, the amount of SO, adsorption increased. This increase in adsorption capacity was directly correlated to the amount of CO2 evolved during heat-treatment of the oxidized ACFs. The amount of SO2 adsorbed for these samples was related to the pore size, pore surface chemistry and pore volume. This analysis is explained in more detail in this paper. 0 1997 Elsevier Science Ltd. All rights reserved Key Words-A. Activated carbon, carbon fibers, B. heat treatment, C. adsorption,