Enhanced selective adsorption desulfurization on CO2 and steam treated activated carbons: Equilibria and kinetics

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Title: Enhanced selective adsorption desulfurization on CO2 and steam treated activated carbons: Equilibria and kinetics
Authors: Iruretagoyena, D
Bikane, K
Sunny, N
Lu, H
Kazarian, SG
Chadwick, D
Pini, R
Shah, N
Item Type: Journal Article
Abstract: Activated carbons (ACs) show great potential for selective adsorption removal of sulfur (SARS) from hydrocarbon fuels but require improvements in uptake and selectivity. Moreover, systematic equilibria and kinetic analyses of ACs for desulfurization are still lacking. This work examines the influence of modifying a commercial-grade activated carbon (AC) by CO2 and steam treatment for the selective adsorption removal of dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT) at 323 K. An untreated AC and a charcoal Norit carbon (CN) were used for comparative purposes. Physicochemical characterization of the samples was carried out by combining N2-physisorption, X-ray diffractometry, microscopy, thermogravimetric and infrared analyses. The steam and CO2 treated ACs exhibited higher sulfur uptakes than the untreated AC and CN samples. The steam treated AC appears to be especially effective to remove sulfur, showing a remarkable sulfur uptake (~24 mgS·gads−1 from a mixture of 1500 ppmw of DBT and 1500 ppm 4,6-DMDBT) due to an increased surface area and microporosity. The modified ACs showed similar capacities for both DBT and the sterically hindered 4,6-DMDBT molecules. In addition, they were found to be selective in the presence of sulfur-free aromatics and showed good multicycle stability. Compared to other adsorbents, the modified ACs exhibited relatively high adsorption capacities. The combination of batch and fixed bed measurements revealed that the adsorption sites of the samples are characterized as heterogeneous due to the better fit to the Freundlich isotherm. The kinetic breakthrough profiles were described by the linear driving force (LDF) model.
Issue Date: 1-Jan-2020
Date of Acceptance: 26-Jul-2019
URI: http://hdl.handle.net/10044/1/72871
DOI: https://doi.org/10.1016/j.cej.2019.122356
ISSN: 1385-8947
Publisher: Elsevier BV
Start Page: 1
End Page: 11
Journal / Book Title: Chemical Engineering Journal
Volume: 379
Copyright Statement: © 2019 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: Chemical Engineering
0904 Chemical Engineering
Publication Status: Published online
Embargo Date: 2020-07-27
Article Number: 122356
Online Publication Date: 2019-07-27
Appears in Collections:Centre for Environmental Policy
Chemical Engineering
Faculty of Natural Sciences

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