4. Conclusions
Hydrogen sulfide molecule adsorption has been studied on metal exchanged ZSM-12 clusters (M = Fe, Co, Ni, Cu and Zn atoms) by means of DFT calculations with B3LYP formalism. Cu–ZSM-12 cluster has the lowest chemical potential with minimum adsorption energy value with negative ΔG, highest electronegativity and lowest energy gap between HOMO and LUMO with respect to other clusters. It is softer than other clusters because of its lower chemical hardness value. It
should be determined catalytic activity (the activation energies) of Metal–ZSM-12 zeolites for H2S removal and compared in order to understand their performances. Moreover, direct hydrogen sulfide dissociation and converting co-adsorbed H2S and CO2 and CO into carbonyl sulfide (COS) and water (H2O) and H2 can be studied theoretically on Cu–ZSM-12 zeolite cluster