Kinetic study of SO2 removal over lignin-based activated carbon

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Title: Kinetic study of SO2 removal over lignin-based activated carbon
Authors: Rosas, Juana M. | Ruiz-Rosas, Ramiro | Rodríguez-Mirasol, José | Cordero, Tomás
Research Group/s: Materiales Carbonosos y Medio Ambiente
Center, Department or Service: Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Lignin | Activated carbon | Sulfur dioxide | Adsorption | Kinetic model
Knowledge Area: Química Inorgánica
Issue Date: 1-Jan-2017
Publisher: Elsevier
Citation: Chemical Engineering Journal. 2017, 307: 707-721. doi:10.1016/j.cej.2016.08.111
Abstract: Adsorption of SO2 on an activated carbon obtained by chemical activation of kraft lignin with zinc chloride was studied in a laboratory column. The presence of oxygen and water vapor in the inlet stream increases the SO2 adsorption capacity of the carbon, due to the surface oxidation of the SO2 to SO3 and the subsequent hydration to H2SO4. Desorption of the SO2 chemisorbed at temperatures in the range of 150–300 °C produces carbon gasification, forming oxygen surface groups that decompose mainly as CO at higher temperatures (>−500 °C). The presence of CO2 in the inlet gas decreases the SO2 adsorption capacity of the carbon. However, the presence of NO does not produce any significant change in the adsorption of SO2, at the studied conditions. The breakthrough curves of the SO2 adsorption are predicted adequately by a rigorous mathematical model that takes into account the catalytic oxidation of SO2 by an Eley-Rideal mechanism and the reaction between adsorbed SO3 and water vapor to produce H2SO4, followed by the elution of the adsorbed H2SO4 that releases the active sites.
Sponsor: This work was supported by the Spanish Ministry of Economy and Competitiveness under CTQ2012-36408 and CTQ2015-68654-R projects.
ISSN: 1385-8947 (Print) | 1873-3212 (Online)
DOI: 10.1016/j.cej.2016.08.111
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2016 Elsevier B.V.
Peer Review: si
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Appears in Collections:INV - MCMA - Artículos de Revistas

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