The molecular adsorption of hydrogen sulfide has been theoretically studied via DFT on additional framework
with cations ofmetals (Fe, Co, Ni, Cu and Zn) in 14T-channel ZSM-12 zeolite clustermodel. Themethod employed
in this study is B3LYP functional with LanL2DZ and 6–31 G(d,p) basis sets. Cu–ZSM-12 cluster has the lowest
chemical potentialwithminimumadsorption energy valuewith negative ΔG, highest electronegativity and lowest
energy gap between HOMOand LUMOwith respect to other clusters. It is softer than other clusters because of
its lower chemical hardness value. Accordingly, based on these data it can be mentioned that Cu–ZSM-12 is a
promising candidate catalyst as for removal of hydrogen sulfide via activation of S–H bond than other metal
ZSM-12 zeolites