Polarizable Force Field for CO2 in M-MOF-74 Derived from Quantum Mechanics
Journal
Journal of Physical Chemistry C
Journal Volume
122
Journal Issue
42
Pages
24488-24498
Date Issued
2018
Author(s)
Abstract
On the short term, carbon capture is a viable solution to reduce human-induced CO2 emissions, which requires an energy efficient separation of CO2. Metal-organic frameworks (MOFs) may offer opportunities for carbon capture and other industrially relevant separations. Especially, MOFs with embedded open metal sites have been shown to be promising. Molecular simulation is a useful tool to predict the performance of MOFs even before the synthesis of the material. This reduces the experimental effort, and the selection process of the most suitable MOF for a particular application can be accelerated. To describe the interactions between open metal sites and guest molecules in molecular simulation is challenging. Polarizable force fields have potential to improve the description of such specific interactions. Previously, we tested the applicability of polarizable force fields for CO2 in M-MOF-74 by verifying the ability to reproduce experimental measurements. Here, we develop a predictive polarizable force field for CO2 in M-MOF-74 (M = Co, Fe, Mg, Mn, Ni, Zn) without the requirement of experimental data. The force field is derived from energies predicted from quantum mechanics. The procedure is easily transferable to other MOFs. To incorporate explicit polarization, the induced dipole method is applied between the framework and the guest molecule. Atomic polarizabilities are assigned according to the literature. Only the Lennard-Jones parameters of the open metal sites are parameterized to reproduce energies from quantum mechanics. The created polarizable force field for CO2 in M-MOF-74 can describe the adsorption well and even better than that in our previous work. ? 2018 American Chemical Society.
Subjects
Carbon capture
Crystalline materials
Energy efficiency
Enzyme inhibition
Mechanics
Metals
Molecular structure
Molecules
Organometallics
Quantum theory
Energy efficient
Lennard-Jones parameters
Metalorganic frameworks (MOFs)
Molecular simulations
Polarizabilities
Polarizable force field
Specific interaction
Viable solutions
Carbon dioxide
SDGs
Type
journal article