Desulfurization of diesel fuels: Adsorption of 4,6-DMDBT on different origin and surface chemistry nanoporous activated carbons

Adsorption of 4,6-dimethyldibenzothiophene (4,6-DMDBT) from solutions in hexadecane was investigated on three commercial nanoporous activated carbons of different origin and nature, which possessed either microporous or combined micro/mesoporous structures, and their oxidized counterparts. The initial and exhausted carbons were characterized using the nitrogen porosimetry at 77 K, thermal analysis, Boehm titration, and FTIR. The capacity for 4,6-DMDBT removal increases with an increase in the volume of pores with size similar to that of 4,6-DMDBT molecules, which is about 6 A. Functional groups present on the surface of larger pores contribute to adsorption via polar interactions. (C) 2013 Elsevier B.V. All rights reserved.