Adsorption Isotherms of Phenol and 4-Chlorophenol on Petroleum Asphaltenes M. Jaoui, C. Achard, N. Hasnaoui and M. Rogalski Rev. Inst. Fr. Pét., 53 1 (1998) 35-40 Published online: 01 November 2006 DOI: 10.2516/ogst:1998006