P. Treesukol et al., Adsorption of nitrogen monoxide and carbon monoxide on copper-exchanged ZSM-5: A cluster and embedded cluster study, J PHYS CH B, 105(12), 2001, pp. 2421-2428
We present a systematic study on the adsorption of NO and CO in Cu-ZSM-5, u
sing an ab initio embedded cluster methodology at the B3LYP level of theory
. We found that the effects of the cluster size and Madelung potential are
small for adsorption energies of CO and NO. For adsorption of CO, the calcu
lated binding energy of 32 kcal/mol is in good agreement with experimental
data from 29 to 32 kcal/mol. On the contrary, for adsorption of NO the calc
ulated binding energy of 22 kcal/mol is much smaller than the experimental
estimate, though it is consistent with recent experimental observation that
NO binding energy should be smaller than that of CO. Madelung potential, h
owever, is important for obtaining the correct blue shift of an adsorbed CO
and red shift of an adsorbed NO.