Temperature-programmed desorption of ethanol from ZSM-5, ZSM-11 and Theta-1

Abstract

Ethanol was adsorbed on low Si/Al ratio ZSM-5, ZSM-11 and Theta-1 at room temperature and relative pressure p/p_o= 0.5, in situ, in a thermal gravimetric balance. The saturation capacity of ZSM-11 was found to be slightly greater than ZSM-5 and ca. twice as large as that of Theta-1. Temperature-programmed desorption profiles of ethanol were determined and analysed by (a) a variable heating rate and (b) single heating rate method using an on-line computer. The effect of cation exchange on the sorption capacities and activation energies of desorption have also been determined.