Estimation of Activation Energy of Desorption of n-Hexanol from Activated Carbons by the TPD Technique

Abstract

Activated carbon and five kinds of metal-ion-substituted activated carbons, viz. Ag⁺-activated carbon, Cu²⁺-activated carbon, Fe³⁺-activated carbon, Ba²⁺-activated carbon and Ca²⁺-activated carbon, were prepared. A model for estimating the activation energy of desorption was established. Temperature-programmed desorption (TPD) experiments were conducted to measure the TPD curves of n-hexanol and hence estimate the activation energy for n-hexanol desorption from the various activated carbons. The results showed that the activation energies for n-hexanol desorption from the Ag⁺-activated carbon, the Cu²⁺-activated carbon and the Fe³⁺-activated carbon were higher than those from the unsubstituted activated carbon, the Ca²⁺-activated carbon and the Ba²⁺-activated carbon.