Separation of H2CO2 and CH4CO2 binary mixtures by zeolite-like imidazolate frameworks

Sámano-Alonso, C.; Cabrera, Rene; Hernández-Obregón, J.; Lemus-Santana, A.A.; Reguera, E.

doi:10.1016/j.surfin.2016.09.009

Cited by 2 publications

(5 citation statements)

References 25 publications

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“…The values of the apparent sorption enthalpies of CO2 and N2, (ΔHs = EP-ED), are also shown in Table 3. It is noticeable that the sorption enthalpy values calculated for the PZIFs are of the same order than those obtained for the fillings in their single phase [18].…”

Section: Apparent Gas Permeation In Pzifs Membranessupporting

confidence: 54%

“…Subsequently, the Pa value decreased by half in the case PZ-Zn/Co while the Pa values for the other two ZIFs increased, what it is attributed to the absence of local charge anisotropy, bigger particle size (smaller contact area) and a slight increase in pore size. The most important of the three factors is the local charge anisotropy since CO2 molecules have a quadrupole moment of (-4.3 erg 1/2 cm 5/2 ×10 26 ) and a polarizability (2.9x10 -24 cm 3 ) that results in an effect on its permeability as a consequence of the contacting area composition [18].…”

Section: Apparent Gas Permeation In Pzifs Membranesmentioning

confidence: 99%

“…2 > 2 ) [20]. The attractive interactions between molecules with quadrupole moment, Q, (such as QN2 (-1.5 erg 1/2 cm 5/2 ×10 26 ) and QCO2 (-4.3 erg 1/2 cm 5/2 ×10 26 )), and the local electric field present in lattices ZIFs, are an example of the sorption force [18,32]. In the process of gas transport through the PZIFs, these sorption forces are present and are evidenced on the permeability values obtained (see Table 1).…”

Section: Apparent Gas Permeation In Pzifs Membranesmentioning

confidence: 99%

“…Samano and coworkers. [18] reported the separation of the H2/CO2 and CH4/CO2 binary mixtures using packed columns of ZIFs (ZIF-4, ZIF-8, ZIF-67 and ZIF-ZnCo). The gas separation study showed that the solid ZIF-Zn/Co solution exhibited higher sorption of molecules with quadrupole moment (for example H2 and CO2) compared to their analogues.…”

Section: Apparent Gas Permeation In Pzifs Membranesmentioning

confidence: 99%

“…ZIF-8, which molecular formula is: Zn (mIm)2, (where mIm=2-methylimidazole) has sodalite topology and shows adsorption affinity CO2 molecules; also the ZIF-8 exhibits exceptional thermal and chemical stability [8,14,15]. ZIF-67, Co (mIm)2, ZIF-Mix, Zn/Co (mIm)2, and ZIF-8 are isostructural materials exhibit six members rings (~ 3.4 Å) as pore openings [16,17,18]. These three materials have shown a differentiated sorption performance (when studied by IGC), due to the charge anisotropy, consequence of the metallic center nature.…”

Section: Introductionmentioning

confidence: 99%

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Modification of polyetherimide membranes with ZIFs fillers for CO2 separation

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Lemus

et al. 2019

Separation and Purification Technology

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Flat hybrid membranes composed of polyetherimide (PEI) as matrix and zeolitic imidazolate frameworks (ZIFs) as fillers at concentrations of 10 and 20 wt % were prepared. Apparent permeability coefficient and apparent diffusivity coefficient of gases (CO2 and N2) for these hybrid membranes (PZIFs) were determined by the "time-lag" method. The experimental conditions used were from 25 °C to 55 °C with pressures of 2, 3 and 5 bar. The PZIFs with fillers of ZIF-8 (PZ-Zn) and ZIF-67 (PZ-Co) showed apparent selectivities ( ( 2 ) ( 2 ) ⁄ ) of 39.6 and 27.5, respectively, higher than the( 2 ) ⁄ of the reference membrane PEI, while the membrane with filler of ZIF-Mix (PZ-Zn/Co) showed the lowest( 2 ) ⁄ selectivity of 10.3 in the membrane series (under conditions of 25 °C and 2 bar). It is proposed that the selectivity of the membrane series can be attributed to two critical factors: the particle size/distribution ratio in the polymer base and sorption of CO2 at local sites of the bimetallic mixture.On the other hand, gas permeation studies (O2, CO2 and CH4, and CO2/CH4 and CO2/C2H4 mixtures), were carried out in the series of PZIFs membranes. Permeability data were obtained by an isostatic method based on a permeation cell connected in series to a gas chromatograph where the rate of permeated gases was analyzed until a stationary state was reached. The complementary characterization techniques were: scanning electron microscopy, thermogravimetric analysis, and powder X-ray diffraction, which support the existence of the amorphous/crystalline phases of the PZIFs.

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Section: Apparent Gas Permeation In Pzifs Membranessupporting

confidence: 54%

Section: Apparent Gas Permeation In Pzifs Membranesmentioning

confidence: 99%

Section: Apparent Gas Permeation In Pzifs Membranesmentioning

confidence: 99%

Section: Apparent Gas Permeation In Pzifs Membranesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Modification of polyetherimide membranes with ZIFs fillers for CO2 separation

Vega

Andrio

Lemus

et al. 2019

Separation and Purification Technology

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Conductivity study of Zeolitic Imidazolate Frameworks, Tetrabutylammonium hydroxide doped with Zeolitic Imidazolate Frameworks, and mixed matrix membranes of Polyetherimide/Tetrabutylammonium hydroxide doped with Zeolitic Imidazolate Frameworks for proton conducting applications

Vega

Andrio

Lemus

et al. 2017

Electrochimica Acta

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Currently, proton exchange membrane fuel cells (PEMFC) are the focus of attention in the development of electrochemical devices called fuel cells. These devices, which are capable of transforming chemical energy into electrical energy, have shown high performance in the conversion of energy from fuels such as hydrogen and methanol [1]. The operation of a PEMFC is similar to that of a galvanic cell where the electrons produced travel through an external circuit while the protons are transported through a barrier called a proton exchange membrane (PEM) which, in turn, prevents the passage of electrons and fuel [2]. Today, the most popular materials for PEMs are the perfluorosulphonic materials, among which the most outstanding is Nafion ®. This is because the Nafion exhibits excellent mechanical properties, chemical stability, and high proton conductivity; however, its high cost and low operating temperature for proton transport are factors that influence the search for new proton conductive materials [3,4]. Sulfonation of polymers to produce, for example, sulfonated poly-ether-ether-ketone (SPEEK) seems to be a promising solution for the substitution of perfluorosulphonic materials because it has a proton conduction on the order of 10 −2 S cm −1 (above 80 °C), which is similar to the that of Nafion membranes [5]. However, the degree of sulfonation of

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Separation of H2CO2 and CH4CO2 binary mixtures by zeolite-like imidazolate frameworks

Cited by 2 publications

References 25 publications

Modification of polyetherimide membranes with ZIFs fillers for CO2 separation

Modification of polyetherimide membranes with ZIFs fillers for CO2 separation

Conductivity study of Zeolitic Imidazolate Frameworks, Tetrabutylammonium hydroxide doped with Zeolitic Imidazolate Frameworks, and mixed matrix membranes of Polyetherimide/Tetrabutylammonium hydroxide doped with Zeolitic Imidazolate Frameworks for proton conducting applications

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