Metal-organic frameworks with high capacity and selectivity for harmful gases

Britt, David K.; Tranchemontagne, David J.; Yaghi, Omar M.

doi:10.1073/pnas.0804900105

Cited by 869 publications

(626 citation statements)

References 24 publications

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“…[19][20][21] During recent years it has been shown that a large variety of 2-D and 3-D metal organic networks with high porosity, unusual ions exchange and adsorptive properties can be designed using intermolecular interactions and metal-ligand coordination. [22][23][24][25] The structure of the materials obtained is the result of maximum degrees of freedom of both components, spherical shape of metal ions and welldefined points of contacts in the organic linkers. [26] In spite of the very high porosities of MOFs, their open framework is not able to provide strong nonspecific adsorption forces to retain small molecules at ambient conditions.…”

Section: Another Group Of Materials Which Has Recently Open New Possimentioning

confidence: 99%

MOF–Graphite Oxide Composites: Combining the Uniqueness of Graphene Layers and Metal–Organic Frameworks

2009

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Graphite oxide (GO) / metal-organic framework (MOF-5) nanocomposites are synthesized with various ratios of the two components. In developing the concept of these new adsorbents, it was expected that distorted graphene sheets would contribute to the enhancement in the dispersive interactions, whereas MOF-5 component would contribute to the expansion of the pore space where adsorbates could be stored. Moreover, taking into account the variety of transition and noble metals, which can be used to form the MOF structure, those materials Moreover, specific combination and synergy between GO and MOF-5 units also result in the formation of a unique porosity characteristic of the nanocomposites.3

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Section: Another Group Of Materials Which Has Recently Open New Possimentioning

confidence: 99%

MOF–Graphite Oxide Composites: Combining the Uniqueness of Graphene Layers and Metal–Organic Frameworks

2009

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“…1) (9). This material was found to have exceptional separation capacity for gases such as sulfur dioxide, ammonia, and ethylene oxide (10), and H 2 storage capacity (11). Subsequent to this initial discovery, a series of MOFs in which the 5-coordinate zinc(II) ions of MOF-74 are substituted for various divalent metal ions, including nickel, cobalt, manganese, and magnesium, has been described in various reports (12)(13)(14)(15).…”

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confidence: 99%

Highly efficient separation of carbon dioxide by a metal-organic framework replete with open metal sites

Britt

Furukawa

Wang

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

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Selective capture of CO2, which is essential for natural gas purification and CO 2 sequestration, has been reported in zeolites, porous membranes, and amine solutions. However, all such systems require substantial energy input for release of captured CO2, leading to low energy efficiency and high cost. A new class of materials named metal-organic frameworks (MOFs) has also been demonstrated to take up voluminous amounts of CO 2. However, these studies have been largely limited to equilibrium uptake measurements, which are a poor predictor of separation ability, rather than the more industrially relevant kinetic (dynamic) capacity. Here carbon dioxide capture ͉ dynamic adsorption ͉ reticular chemistry S elective removal of CO 2 from gaseous mixtures is of paramount importance for the purification of fuel gases such as methane and acetylene and because of the imminent problem of anthropogenic CO 2 emissions. Effective systems for CO 2 removal must combine high selectivity and capacity with minimal energetic input to liberate the captured CO 2 . Materials presently used are amine solutions, zeolites, and porous membranes, but all fall short in one or more of these categories (1). To date, metal-organic frameworks (MOFs) have been shown to exhibit exceptional CO 2 storage capacity under equilibrium conditions where pure CO 2 is introduced into the pores (2-6). However, their capacities are dramatically reduced when exposed to mixtures of gases under dynamic conditions, as would be the case in power plant f lue gas and methane mining applications. A useful measure of dynamic separation capacity is obtained by exposing the material to mixed gas streams and detecting the appearance or ''breakthrough'' of CO 2 from the material. Here, we report that a MOF replete with open magnesium sites, Mg-MOF-74 [Mg 2 (DOT); DOT: 2,5-dioxidoterephthalate], has excellent selectivity, facile regeneration, and among the highest dynamic capacities reported for CO 2 in porous materials. Specifically, when Mg-MOF-74 is subjected to a gas stream containing 20% CO 2 in CH 4 , a percentage in the range relevant to industrial separations, it captures only CO 2 and not CH 4 . The pores retain 89 g of CO 2 per kilogram of material before breakthrough, a value higher than any other achieved in MOFs, and that rivals the highest capacities in zeolites. Remarkably, 87% of the captured CO 2 can be liberated at room temperature, and the remaining amount can be completely removed by mild heating (80°C). Based on this favorable performance, we assert that MOFs represent a competitive class of materials for efficient CO 2 capture, and that Mg-MOF-74 strikes the right balance between high capacity and heat of adsorption, notwithstanding the great opportunities available for functionalizing such MOFs for even further improved performance.In previous work, it has been shown that coordinatively unsaturated (open) metal sites in MOFs can be prepared by removal of coordinated solvent molecules (7,8). Whereas f lexible molecular or polymeric structures rearran...

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“…27 The breakthrough time is defined as the time when the outlet concentration was about 5% of the inlet concentration. 28 The adsorbed amounts were calculated by the equation…”

Section: Adsorption Measurementsmentioning

confidence: 99%

Study of the Influence of Pore Width on the Disposal of Benzene Employing Tunable OMCs

Wang

Zhang

Wang

et al. 2015

Ind. Eng. Chem. Res.

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By employing SBA-15 as a hard template and boric acid as a pore-expanding agent, we synthesized a series of tunable ordered mesoporous carbons (OMCs) with high specific surface areas and large pore volumes. The synthesized OMCs were used as adsorbents for benzene disposal to explore the influence of pore width on the adsorption of benzene. The XRD and nitrogen adsorption results revealed that the pore sizes of OMCs were contracted at certain values, within the range of 3.4−7.7 nm. The adsorption results for benzene on the OMCs showed that there was a gradual decrease in adsorption potential as the pore size of the adsorbent material increased. In addition, an evaluation of the dynamic adsorption of benzene per unit surface area indicated that the adsorption behaviors were strongly influenced by the pore width of the adsorbent material.

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Metal-organic frameworks with high capacity and selectivity for harmful gases

Cited by 869 publications

References 24 publications

MOF–Graphite Oxide Composites: Combining the Uniqueness of Graphene Layers and Metal–Organic Frameworks

MOF–Graphite Oxide Composites: Combining the Uniqueness of Graphene Layers and Metal–Organic Frameworks

Highly efficient separation of carbon dioxide by a metal-organic framework replete with open metal sites

Study of the Influence of Pore Width on the Disposal of Benzene Employing Tunable OMCs

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