Hierarchical modeling of ammonia adsorption in functionalized metal-organic frameworks

Decai Yu, Pritha Ghosh, Randall Q Snurr*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

The adsorption of ammonia in four metal-organic frameworks modified with different functional groups (-OH, -CO, -Cl, -COOH) was investigated using a hierarchical molecular modeling approach. To describe the hydrogen bonding and other strong interactions between NH 3 and the surface functional groups, a set of Morse potential parameters were obtained by fitting to energies from quantum chemical calculations at the MP2 level of theory. We describe a systematic force field parameterization process, in which the Morse parameters were fitted using simulated annealing to match a large number of single-point MP2 energies at various distances and angles. The fitted potentials were then used in grand canonical Monte Carlo simulations to predict ammonia adsorption isotherms and heats of adsorption in functionalized MIL-47, IRMOF-1, IRMOF-10, and IRMOF-16. The results show that ammonia adsorption can be significantly enhanced by using materials with appropriate pore size, strongly interacting functional groups, and high density of functional groups.

Original languageEnglish (US)
Pages (from-to)3962-3973
Number of pages12
JournalDalton Transactions
Volume41
Issue number14
DOIs
StatePublished - Apr 14 2012

ASJC Scopus subject areas

  • Inorganic Chemistry

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