Temperature-programmed desorption (TPD) of cyclopentane, benzene and cyclohexane in silicalite-1 from room temperature to 400 degrees C at different loading has been investigated by intelligent gravimetry. TPD of cyclopentane and benzene at different heating rates (5, 10, 15 and 2 degrees'C/min) has also been studied. There are two different peaks in cyclopentane and benzene TPD profiles at loading over four molecules per unit cell. Only one peak appears at loading lower than (or equal to) four molecules per unit cell in cyclopentane and benzene TPD profiles and in cyclohexane TPD profiles. The maximum desorption peak temperature increases with the increasing of initial adsorbate loading. (C) 2004 Elsevier B.V. All rights reserved.