Helium Recovery by a Cu-BTC Metal–Organic-Framework Membrane

Cao, Fahai; Zhang, Chunjuan; Xiao, Yuanlong; Huang, Hongliang; Zhang, Wenjuan; Liu, Dahuan; Zhong, Chongli; Yang, Qingyuan; Yang, Zhuhong; Lü, Xiaohua

doi:10.1021/ie301445p

Cited by 65 publications

(46 citation statements)

References 47 publications

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“…The membrane morphologies were observed via scanning electron micrographs (SEM) (FEI, a XL-30 ESEM-FEG microscope, US), where gold-coated specimens were used to increase the conductivity and the measurements were operated under 10-20 kV acceleration voltage. 4 The membrane was first simply broken and cleaned in air flow to remove dust. 10…”

Section: Characterization Of Zif-9-67 Hybrid Membranementioning

confidence: 99%

“…The ideal selectivities of CO 2 with respect to H 2 , N 2 , CO and CH 4 were calculated as the ratio of their permeances. 4 Each measurement was repeated three times, and the averaged values were adopted. network releases its free molecules and DMF guests in the temperature range of 25 °C to 350 °C, forming its solvent-free phase, which is thermally stable up to 550 °C (Fig.…”

Section: Permeation Measurementsmentioning

confidence: 99%

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A hybrid zeolitic imidazolate framework membrane by mixed-linker synthesis for efficient CO₂capture

et al. 2013

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Fuchen Chemical Reagents Factory), potassium permanganate (KMnO 4 , Beijing Yongjia Boyuan Trading Co. Ltd.), potassium carbonate (K 2 CO 3 , ≥99%, Beijing Chemical Works). Porous α-Al 2 O 3 disks, (Angtai Electronic Ceramics Co. Ltd.) 30 mm in diameter, 3 mm in thickness, were used as supports. Modification of the support surface: Porous α-Al 2 O 3 disks were selected as the supports of membranes with the most probable pore size of ca. 160 nm and about 35% porosity. One side of the support was polished using 2000 grit SiC sandpaper to obtain a smoother surface for membrane growth, ultrasonically cleaned using abundant deionized water to clean off the impurities. 1,2 Then the α-Al 2 O 3 discs were soaked in saturated NaOH solution for 24 h to get rid of the oil of support surfaces and also increase the concentration of free hydroxyl groups. 3 After that the supports were ultrasonically dealt with abundant deionized water, then dried at 100 °C for 1 h. 4 The supports were then exposed to the vinyltrimethoxysilane (CH 2 =CH Si(OCH 3) 3 for 20 h, followed by rinsing with deionized water and drying. The terminating vinyl group of the vinyltrimethoxysilane self-assembled organic monolayer (SAM) was oxidized by immersing the supports into an aqueous solution (20 ml) of 0.002 g KMnO 4 , 0.084 g NaIO 4 and 0.007 g K 2 CO 3 according to the methods in literature. 5-7 After 20 h the supports were removed from the oxidation solution, rinsed with water and dried.

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Section: Characterization Of Zif-9-67 Hybrid Membranementioning

confidence: 99%

Section: Permeation Measurementsmentioning

confidence: 99%

A hybrid zeolitic imidazolate framework membrane by mixed-linker synthesis for efficient CO₂capture

et al. 2013

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“…[4] The gas permeability are quite sensitive to the thickness of membrane materials. [5,6,7] Therefore, the ideal membrane should be as thin as possible to receive maximum flux, mechanically robust to prevent cracking, and with well−defined pore sizes to increase selectivity. It is highly desirable to design the efficient He separation membrane having atomic thickness and sub−nanometer pores.…”

Section: Introductionmentioning

confidence: 99%

Theoretical design of a strain-controlled nanoporous CN membrane for helium separation

Rao

Chu

et al. 2019

Computational Materials Science

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Designing an efficient membrane for He purification is quite crucial in scientific and industrial applications. Ultrathin membranes with intrinsic pores are highly desirable for gas purification because of their controllable aperture and homogeneous hole distribution. Based on the first−principles density function theory and molecular dynamics simulations, we demonstrate that the compressively strained graphitic carbon nitride (CN) can effectively purify He from Ne and Ar. Under a −6% strain, the CN monolayer with a suitable pore size presents an easily surmountable barrier for He (0.11 eV) but formidable for Ne (0.51 eV) and Ar (2.45 eV) passing through the membrane, and it exhibits exceptionally high selectivity of 5.17 × 10 6 for He/Ne and 1.89 × 10 39 for He/Ar, as well as excellent He permeance of 1.94 × 10 7 GPU at room temperature, superior to those of porous graphene and C 2 N membrane. Our results confirm that strain−tuned CN membrane could be potentially utilized for He separating from other noble gases.

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“…It is worth pointing out that membranes with as high permeability as possible and sufficient selectivity are of major interest for industrial applications . Many types of inorganic membranes, e.g., porous alumina, silica, zeolite and MOF membranes, have also been evaluated for He/N 2 separation, mainly at ambient temperature. The reported ideal separation selectivities were low and close to the Knudsen selectivity of 2.6 .…”

Section: Introductionmentioning

confidence: 99%

Efficient separation of N₂ and he at low temperature using MFI membranes

Grahn

Korelskiy

et al. 2016

AIChE Journal

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in Wiley Online Library (wileyonlinelibrary.com) Ultra-thin MFI membranes were evaluated for N 2 /He separation over the temperature range of 85-260 K for the first time. The membranes were rather nitrogen selective at all the conditions investigated. A highest N 2 /He selectivity of 75.7 with a high N 2 flux of 83 kg/m 2 /h was observed at 124 K. The separation was attributed to adsorption selectivity to N 2 , effectively hindering the transport of He in the zeolite pores. The exceedingly high permeance even at low temperatures was ascribed to the ultrathin (<1lm) membrane used. As the pressure ratios increased, a better separation performance was obtained. A mathematical model showed the largest difference of adsorbed loading over the film at ca. 120 K was the main reason for the observed maximum selectivity. Further, the modelling indicated the selectivity would increase 2-3 times by reducing the influence of defects, concentration polarization, and pressure drop over the support.

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Helium Recovery by a Cu-BTC Metal–Organic-Framework Membrane

Cited by 65 publications

References 47 publications

A hybrid zeolitic imidazolate framework membrane by mixed-linker synthesis for efficient CO₂capture

A hybrid zeolitic imidazolate framework membrane by mixed-linker synthesis for efficient CO₂capture

Theoretical design of a strain-controlled nanoporous CN membrane for helium separation

Efficient separation of N₂ and he at low temperature using MFI membranes

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Helium Recovery by a Cu-BTC Metal–Organic-Framework Membrane

Cited by 65 publications

References 47 publications

A hybrid zeolitic imidazolate framework membrane by mixed-linker synthesis for efficient CO2capture

A hybrid zeolitic imidazolate framework membrane by mixed-linker synthesis for efficient CO2capture

Theoretical design of a strain-controlled nanoporous CN membrane for helium separation

Efficient separation of N2 and he at low temperature using MFI membranes

Contact Info

Product

Resources

About

A hybrid zeolitic imidazolate framework membrane by mixed-linker synthesis for efficient CO₂capture

A hybrid zeolitic imidazolate framework membrane by mixed-linker synthesis for efficient CO₂capture

Efficient separation of N₂ and he at low temperature using MFI membranes