Kinetic separation of CO2/CH4 mixtures with Ni-MOF-74@Al2O3 core–shell composites

Otter, Dirk; Ernst, Sebastian‐Johannes; Krätz, Lorenz; Bart, Hans‐Jörg

doi:10.1007/s42452-020-2885-y

Cited by 11 publications

(9 citation statements)

References 21 publications

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“…The emergence of porous coordination polymers (PCPs) with unprecedented diversity in structures and functions has become a significant materials chemistry achievement over the past two decades. Crystalline materials' porosity and tailored functionality have attracted extensive attention in application areas of gas storage, [1][2][3] separation, [4][5][6] luminescence, [7][8][9] piezoelectricity, [10][11][12] catalysis, [13][14][15] magnetism, [16][17][18] biomedicine, [19][20][21] sensors, [22][23][24] and so on. Considering their large specific surface area, adjustable pore size, and surface chemical sites, compared to all the applications, exploring the potential use of PCPs as chemical sensors has broad application prospects and extraordinary significance.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient fluorescent chemosensor for nitro antibiotic detection based on luminescent coordination polymers with 2,6-di(4-carboxyphenyl)pyrazine

Sun

et al. 2021

CrystEngComm

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Section: Introductionmentioning

confidence: 99%

Highly efficient fluorescent chemosensor for nitro antibiotic detection based on luminescent coordination polymers with 2,6-di(4-carboxyphenyl)pyrazine

Sun

et al. 2021

CrystEngComm

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“…This property makes IFP‐6 potentially attractive for use as a molecular sieve for the kinetic separation of CO 2 /CH 4 ‐mixtures in dynamic processes in application of, for example, mixed matrix membranes or core shell composites. [ 38 ] For a further validation of the inner consistency of the EL model, the heats of adsorption obtained directly from the model equation itself were compared to those derived from the graphical solution applying the isosteric method (see Figures 9 and 10). The comparative plots show that the heats of adsorption of all investigated systems are in the same order of magnitude and thus show inner consistency.…”

Section: Resultsmentioning

confidence: 99%

Modelling adsorption based on an isoreticular MOF‐series of IFPs–Part I: Collection of physical properties and single component equilibria

et al. 2021

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An isoreticular series of metal organic frameworks (MOFs) of IFPs (IFP, imidazolate frameworks Potsdam) is investigated for their morphological properties and adsorption behaviour. The materials are characterized phenomenologically with respect to their particle size and tendency of agglomerate formation, and with respect to their internal structure. For this purpose, material densities, pore size distributions, specific inner surfaces, and porosities are determined. The main part of the investigation is based on the analysis of gravimetrically determined adsorption equilibria for carbon dioxide (CO2) and methane (CH4) and their modelling. In this context, two different approaches for the consideration of the buoyancy of the sample are compared. The adjusted measurement data are globally approximated as sets of isotherms at different temperatures with two different modifications of the Langmuir model. Results show that both models are well suited for the interpolation of the experimental data in the temperature range under consideration. Comparison of the heats of adsorption derived from the isosteric method with values extracted from the model equations confirms them as physically consistent. This provides the opportunity to numerically simulate the dynamic separation of CO2/CH4‐mixtures under consideration of the heat tone based on the single component data. The IFPs can be divided phenomenologically into two categories. One is exclusively microporous (IFP‐4, ‐6, ‐7, and ‐8), while the other exhibits hierarchical structures of micropores coupled with mesopores (IFP‐1, ‐2, ‐3, and ‐5). Equilibrium data indicate that the latter are better suited for the separation of CO2/CH4‐mixtures due to their higher selectivities and capacities.

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“…To gain more insight into the influence of the plant periphery, such as pipes and fixtures, residence time distributions are determined with inert particles that do not interact with the gas phase and are of the same size distribution as the adsorbent. Via a mass balance by integration of the concentration profiles obtained in this way at the outlet of the adsorber over the time, the absolute adsorbed amount of each species,

i

, is inferred [ 11 ] :

n_{i, T, p}^{ads} = \frac{p}{normalR T} \int_{t_{0}}^{t_{\infty}} ((), {\dot{V}}_{in} ((), t) y_{i, italicin} ((), t) - {\dot{V}}_{out} ((), t) y_{i, italicout} ((), t)) italicdt

The numerical integration of the measurement data is performed using Euler's midpoint formula for the approximation of Riemann integrals [ 12 ] :

\int_{a}^{b} f ((), x) italicdx \approx \sum_{j = 1}^{n} ((), x_{j + 1} - x_{j}) ((), \frac{f (x_{j}) + f (x_{j + 1})}{2})

The associated estimated error, which is proportional to the interval size,

([], a, b)

, and indirectly proportional to the number of increments,

n

, is shown in Equation ():

(||, \int_{a}^{b} f ((), x) italicdx - \sum_{j = 1}^{n} ((), x_{j + 1} - x_{j})) \leq \frac{{((), b - a)}^{3}}{24 n} ‖f^{''} ...</p>)‖

…”

Section: Methodsmentioning

confidence: 99%

Modelling adsorption based on an isoreticular MOF‐series of IFPs—Part II: Dynamic adsorption in fixed beds

et al. 2021

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Based on experimental pure component data for the characterization of the isostructural imidazolate framework Potsdam (IFP) series reported in Part I, a model for the simulation of non‐isothermal dynamic adsorption of CO2/CH4‐mixtures in fixed‐bed columns is presented in this Part II. The robustness of the model is examined and validated, by comparison to experimental breakthrough data at different process conditions, such as varying concentration, temperature, and pressure. Thereby, different predictive methods for the estimation of adsorption equilibria of mixtures are compared (RAST, IAST, ML). The results show that ideal behaviour can be assumed with good accuracy for the system under consideration, except for IFP‐2, which shows significant deviations at increased pressures and temperatures. A detailed kinetic analysis reveals that mass transfer is significantly influenced by micropore diffusion. Thus, only for IFP‐1 the dynamic separation of CO2 and CH4 is equilibrium‐driven, while for the remaining IFPs the kinetic regime dominates the process, which in some cases increases the separation efficiency (IFP‐2 to ‐7) but can also inhibit it (IFP‐8). The determined intracrystalline diffusion coefficients show very good agreement with values for metal organic framework (MOF) compounds of similar structure reported in the literature.

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Kinetic separation of CO2/CH4 mixtures with Ni-MOF-74@Al2O3 core–shell composites

Cited by 11 publications

References 21 publications

Highly efficient fluorescent chemosensor for nitro antibiotic detection based on luminescent coordination polymers with 2,6-di(4-carboxyphenyl)pyrazine

Highly efficient fluorescent chemosensor for nitro antibiotic detection based on luminescent coordination polymers with 2,6-di(4-carboxyphenyl)pyrazine

Modelling adsorption based on an isoreticular MOF‐series of IFPs–Part I: Collection of physical properties and single component equilibria

Modelling adsorption based on an isoreticular MOF‐series of IFPs—Part II: Dynamic adsorption in fixed beds

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