Thermal desorption has been studied or γ-alumina which adsorbed adsorbates, such as benzene, cyclohexane, methylalcohol, ethylalcohol, n-propylalcohol and iso-propylalcohol, separately at 20 ℃ with Gas Chromatographic apparatus. As the temperature of adsorbent was raised from 20 ℃ to 350 ℃ with the constant heating rates （5-15 ℃/min）, the species on adsorbent surface were desorbed, and thermal conductivity detector was employed to monitor the desorbate in effluent gas. The thermal desorption chromatogram was investigates to obtain the information about the active sites, behavior of desorbed phase with increasing temperature and the adsorbate-adsorbent interaction. By means of the temperature at peak maximum, T_m, the desorption kinetic parameters, e.g., activation energy of desorption and frequency factor were determined.
It was found that γ-alumina had two kinds of active sites different in their property for alcohols. Experimental results represented that the desorption rate was first order with respect to the surface coverage.