Unusual adsorption behavior of a highly flexible copper-based MOF

Reichenbach, C.; Kalies, Grit; Lincke, Jörg; Lässig, Daniel; Krautscheid, Harald; Moellmer, Jens; Thommes, Matthias

doi:10.1016/j.micromeso.2011.01.005

Cited by 41 publications

(25 citation statements)

References 36 publications

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“…Breakthrough experiments at higher practically relevant pressures are neededb ecause slight changes in external stimuli can cause considerable changes in the framework and degree of flexibility.M oreover,t he flexibility of MOFs could be problematic in an industrial application because the framework has to face permanent stress through heating, outgassing, and cooling during adsorption. [31,72] Concerning Lewis acidic MOFs, the liquid-phase separation in aliphatic solvents is an attractive option because in the presence of an aliphatic solventbutenes are preferably adsorbed. [21] An attractive, but much less explored, methodf or C 4 separations is separation through p complexation.…”

Section: Discussionmentioning

confidence: 99%

“…Instead, van der Waals interactions dominate. [72] Alaerts et al studied the separation of binary equimolar mixtures of cis-butene and1 -butene, cis-butenea nd trans-butene, and 1-butene and trans-butene on Cu 3 (BTC) 2 in liquid hexane. [21] The separation factors for these mixturesa re 1.8, 1.9, and2 .4, respectively.T hese values indicate the preference of Cu 3 (BTC) 2 for cis-2-buteneo ver 1-butene and trans-2butene.…”

Section: Separatingc 4 Hydrocarbons With Mofsmentioning

confidence: 99%

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Sustainable Separations of C₄‐Hydrocarbons by Using Microporous Materials

et al. 2017

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Petrochemical refineries must separate hydrocarbon mixtures on a large scale for the production of fuels and chemicals. Typically, these hydrocarbons are separated by distillation, which is extremely energy intensive. This high energy cost can be mitigated by developing materials that can enable efficient adsorptive separation. In this critical review, the principles of adsorptive separation are outlined, and then the case for C4 separations by using zeolites and metal–organic frameworks (MOFs) is examined. By analyzing both experimental and theoretical studies, the challenges and opportunities in C4 separation are outlined, with a focus on the separation mechanisms and structure–selectivity correlations. Zeolites are commonly used as adsorbents and, in some cases, can separate C4 mixtures well. The pore sizes of eight‐membered‐ring zeolites, for example, are in the order of the kinetic diameters of C4 isomers. Although zeolites have the advantage of a rigid and highly stable structure, this is often difficult to functionalize. MOFs are attractive candidates for hydrocarbon separation because their pores can be tailored to optimize the adsorbate–adsorbent interactions. MOF‐5 and ZIF‐7 show promising results in separating all C4 isomers, but breakthrough experiments under industrial conditions are needed to confirm these results. Moreover, the flexibility of the MOF structures could hamper their application under industrial conditions. Adsorptive separation is a promising viable alternative and it is likely to play an increasingly important role in tomorrow's refineries.

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Section: Discussionmentioning

confidence: 99%

Section: Separatingc 4 Hydrocarbons With Mofsmentioning

confidence: 99%

Sustainable Separations of C₄‐Hydrocarbons by Using Microporous Materials

et al. 2017

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“…The hysteretic adsorption behavior in that pressure range indicates a plausible structural transformation of the non-rigid material. [20,21,25,29] This transition appears also in the N 2 (77 K) isotherm, however it is reversible and smeared-out over a wider relative pressure range from 0.005-0.1. CO 2 adsorption on 1 d was studied at 273 K, 298 K, and 323 K and used to calculate the isosteric heat of adsorption ( Figures S8 and S9).…”

mentioning

confidence: 82%

A Microporous Copper Metal–Organic Framework with High H₂ and CO₂ Adsorption Capacity at Ambient Pressure

Lässig¹,

Lincke²,

Moellmer³

et al. 2011

Angew Chem Int Ed

109

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“…Structural flexibility in MOFs has become a subject of interest in recent years. [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] In 2011 we reported on synthesis, crystal structure and adsorption properties of a copper based MOF, [CuĲMe-4py-trzia)] (1), with pts topology. 36 This 3D coordination polymer is easily accessible as single crystals by synthesis under diffusion control and in multigram scale by reflux synthesis of copperĲII)sulfate pentahydrate with 3-methyl-5-pyridine-4-yl substituted triazolyl isophthalic acid H 2 ĲMe-4py-trz-ia) ( Fig.…”

Section: Introductionmentioning

confidence: 99%