Adsorption and separation of CH4/H2 in MIL-101s by molecular simulation study

Defei Liu, Jerry Lin, Zhong Li, Hongxia Xi

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

MIL-101s offer potential application for CH4/H2 adsorption separation owing to its high porosity and excellent chemical stability. In this work, the grand canonical Monte Carlo method was employed to study the adsorption and separation of CH4/H2 on a novel series of MIL-101s materials, such as MIL-101, MIL-101_NDC and new constructed MIL-101_R7-BDC. The simulation results showed that CH4 was preferentially adsorbed over H2 in all MIL-101s. The adsorption capacities of pure CH4 and H2 on MIL-101_NDC were much higher than that in the other two MIL-101s, due to its largest Sacc (accessible surface area) and Vp (pore volume). The adsorption-site results suggested that the super-tetrahedras were the main adsorption site for CH4 molecules in all studied MIL-101s. Moreover, the additional benzene rings in MIL-101_R7-BDC introduced several new CH4 adsorption sites which were close to the edge of large and small cages. Finally, we found that MIL-101_R7-BDC had the highest CH4 selectivity. CH4 selectivity of MIL-101s was significantly affected by δqst (adsorption heat) and Sacc (accessible surface area) in terms of different organic ligands.

Original languageEnglish (US)
Pages (from-to)246-254
Number of pages9
JournalChemical Engineering Science
Volume98
DOIs
StatePublished - Jul 19 2013

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Keywords

  • Adsorption
  • MIL-101s
  • Selectivity
  • Separations
  • Simulation

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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