1,1,2,-trichloro-2,2,1-trifluoroethane is considered to be the prime contributor to stratospheric ozone depletion. Besides, dischloromethane is toxic. As a result, the use of activated carbon to adsorb these chemicals has been received a great attention. In this study, adsorption isotherms of 1,1,2-trichloro-2,2,1-trifluoroethane and dichloromethane on an activated carbon pellet were measured. The equilibria of these chemicals on activated carbon pellet were well expressed by Langmuir equation, and the equilibrium constants were expressed as function of temperature between 298 K and 393 K. Isosteric heats of adsorption were also evaluated from the experimental data.