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Enhanced O2 selectivity versus N2 by partial metal substitution in Cu-BTC

Journal Article · · Chemistry of Materials
DOI:https://doi.org/10.1021/cm5042293· OSTI ID:1184988
 [1];  [1];  [1];  [2];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
Here we describe the homogeneous substitution of Mn, Fe and Co at various levels into a prototypical metal-organic framework (MOF), namely Cu-BTC (HKUST-1), and the effect of that substitution on preferential gas sorption. Using a combination of density functional theory (DFT) calculations, postsynthetic metal substitutions, materials characterization, and gas sorption testing, we demonstrate that the identity of the metal ion has a quantifiable effect on their oxygen and nitrogen sorption properties at cryogenic temperatures. An excellent correlation is found between O2/N2 selectivities determined experimentally at 77 K and the difference in O2 and N2 binding energies calculated from DFT modeling data: Mn > Fe > Co > Cu. Room temperature gas sorption studies were also performed and correlated with metal substitution. The Fe-exchanged sample shows a significantly higher nitrogen isosteric heat of adsorption at temperatures close to ambient conditions (273 K - 298 K) as compared to all other metals studied, indicative of favorable interactions between N2 and coordinatively unsaturated Fe metal centers. Furthermore, differences in gas adsorption results at cryogenic and room temperatures are evident; they are explained by comparing experimental results with DFT binding energies (0 K) and room temperature Grand Canonical Monte Carlo simulations.
Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1184988
Alternate ID(s):
OSTI ID: 1241356
Report Number(s):
SAND--2014-20037J; 547384
Journal Information:
Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 6 Vol. 27; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Two heterovalent copper–organic frameworks with multiple secondary building units: high performance for gas adsorption and separation and I 2 sorption and release journal January 2016
Rare metal-ion metathesis of a tetrahedral Zn( ii ) core of a noncentrosymmetric (3,4)-connected 3D MOF journal January 2019
Vapor-assisted preparation of Mn/Fe/Co/Zn–Cu bimetallic metal–organic frameworks based on octahedron micron crystals (PCN-6′) journal January 2019
Regulating the size and spatial distribution of Pd nanoparticles supported by the defect engineered metal–organic framework HKUST-1 and applied in the aerobic oxidation of cinnamyl alcohol journal January 2019
Three stable dinuclear [M 2 (OH) 0.5 (NO 3 ) 0.5 (RCOO) 2 (RN) 4 ] (M = Cu, Ni) based metal–organic frameworks with high CO 2 adsorption and selective separation for O 2 /N 2 and C 3 H 8 /CH 4 journal January 2020

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