Dynamics of Sorbed Molecules in Zeolites∗
نویسندگان
چکیده
We explore recent efforts to model the dynamics of sorbed molecules in zeolites with either atomistic methods or lattice models. We discuss the assumptions underlying modern atomistic and lattice approaches, and detail the techniques and applications of modeling both rapid dynamics and activated diffusion. We summarize the major findings discovered over the last several years, and enumerate future needs for the frontier of modeling dynamics in zeolites. ∗Submitted as a chapter in “Computer Modelling of Microporous and Mesoporous Materials,” Editors C. R. A. Catlow, R. A. van Santen and B. Smit. †Corresponding author; email: [email protected]. ‡Email: [email protected].
منابع مشابه
A Fluorescence Probe Investigation of the Effect of Alkali Metal Ions on the Micellar Properties of a Crown Ether Surfactant
essentially constant over the complete sorption range. A&, changes very little once most of the pore space is filled, as the environment of the sorbed molecules remains nearly constant. Consequently, AC, is almost invarient from about 5 to 6.5 molecules sorbed per unit cell (Figure 4). This could clearly lead to sorption hysteresis being observed in isotherm experiment^.^ The reason this hyster...
متن کاملRemoval of Heavy Metal Particles by LTJ, ANA, SVR, BEC and MER zeolites particles: A Molecular Dynamics Simulation Study
In present study, molecular dynamics simulation of Cadmium (II), Lead (II) and Copper (II) removal from aqueous electrolyte solutions using the ion-exchange process with the zeolite particles was done. The results showed that, most of the particles had the highest affinity of ion exchanging with Lead (II) and the lowest affinity with Copper (II). The calculated mean ion-exchange ratios showed t...
متن کاملCombined atomistic simulation and quasielastic neutron scattering study of the low-temperature dynamics of hydrogen and deuterium confined in NaX zeolite.
A direct comparison of quasielastic neutron scattering experimental measurements and molecular dynamics computer simulations is carried out for the first time for hydrogen and deuterium confined in the nanostructure of faujasite type zeolites at a temperature of 100 K, in order to investigate the dependence of sorption thermodynamics and sorbate dynamics on the sorbed phase concentration. The c...
متن کاملRemoval of Heavy Metals from Aqueous Solution by Zeolite in Competitive Sorption System
362 Abstract—In this study, the sorption behaviour of natural (clinoptilolite) zeolites with respect to cadmium (Cd), copper (Cu), nickel (Ni), lead (Pb) and zinc (Zn) has been studied in order to consider its application to purity metal finishing wastewaters. The batch method has been employed, using competitive sorption system with metal concentrations in solution ranging from 50 to 300 mg/l....
متن کاملNeutron spectroscopy of water dynamics in NaX and NaA zeolites.
We have investigated the dynamics of water molecules in zeolites NaA and NaX by high-resolution quasielastic neutron scattering methods. Between 260 and 310 K, the local translational diffusive motion of water in the zeolites is one to two orders of magnitude slower than in bulk water. The Q dependence of the scattering shows effects of confinement and the presence of both relatively mobile and...
متن کامل