Improved C3H6/C3H8 separation performance on ZIF-8 membranes through enhancing PDMS contact-dependent confinement effect

Hua, Jingxian; Li, Chang; Tao, Hongxu; Wang, Lei; Song, Eryue; Lian, Haiqian; Wang, Chongqing; Jiang, Jinlong; Pan, Yichang; Xing, Weihong

doi:10.1016/j.memsci.2021.119613

Cited by 17 publications

(3 citation statements)

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“…6 Among practical contenders, ZIF-8 is regarded as the most representative metal-organic frame (MOF) material for gas sensors thanks to its abundant microporous structure, distinguished physical and chemical stability, excellent confinement effect, and plenty of active sites. [7][8][9][10][11] However, due to low internal resistance channels and large barrier heights, single-component structures usually have inferior gas-sensing properties compared to multi-component structures. 12 To solve the above problems, researchers have used heterojunctions and noble metal doping to improve the gas sensing performance.…”

Section: Introductionmentioning

confidence: 99%

In situ assembly of one-dimensional Pt@ZnO nanofibers driven by a ZIF-8 framework for achieving a high-performance acetone sensor

Chen,

Liu,

et al. 2023

Nanoscale

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Section: Introductionmentioning

confidence: 99%

In situ assembly of one-dimensional Pt@ZnO nanofibers driven by a ZIF-8 framework for achieving a high-performance acetone sensor

Chen,

Liu,

et al. 2023

Nanoscale

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“…Generally, TMOS is used for silica membrane preparation, while there are no reports of coating membranes using TMOS on MMM. The most common coating material that is applied to MMM is polydimethylsiloxane [17,[40][41][42][43][44]. On the other hand, the selection size of the silane coating agent influences the gas diffusion compatibility.…”

Section: Introductionmentioning

confidence: 99%

Annealing and TMOS coating on PSF/ZTC mixed matrix membrane for enhanced CO₂/CH₄and H₂/CH₄separation

et al. 2022

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Recently, natural gas (mostly methane) is frequently used as fuel, while hydrogen is a promising renewable energy source. However, each gas produced contains impurity gases. As a result, membrane separation is required. The mixed matrix membrane (MMM) is a promising membrane. The huge surface area and well-defined pore structure of zeolite templated carbon (ZTC)-based MMM allow for effective separation. However, the interfacial vacuum in MMM is difficult to avoid, contributing to poor separation performance. This research tries to improve separation performance by altering membrane surfaces. MMM PSF/ZTC was modified by annealing at 120, 150, and 190°C; coating using 0.01, 0.03, and 0.05 mol tetramethyl orthosilicate (TMOS); and a combination of both, i.e. annealing at 190°C and coating using 0.03 mol TMOS. MMM PSF/ZTC successfully significantly improved CO 2 /CH 4 selectivity by a combination of annealing at 190°C and coating 0.03 mol TMOS from 1.37 to 5.90 (331%), and H 2 /CH 4 selectivity by coating with 0.03 mol TMOS from 4.58 to 65.76 (1378%). The enhancement of selectivity was due to structural changes to the membrane that became denser and smoother, which SEM and AFM observed. In this study, annealing and coating treatments are the methods investigated for improving the polymer matrix and filler particle adhesion.

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“…Zeolitic imidazolate frameworks (ZIFs) as a special subfamily of metal–organic frameworks (MOFs) consist of transition-metal ions (such as Zn 2+ and Co 2+ ) and imidazolate linkers that form topologies similar to those of zeolites and inorganic nano-oxide materials. − By adjusting the components and modifying the functional groups, more than 150 kinds of ZIFs have been produced with different topological features. The unique structures of ZIFs inherit not only the advantages of high porosity, high specific surface area, uniform porous structures, and easy functionalization from MOFs but also the tunability and high stability from traditional zeolites, making them potentially promising for many applications in gas adsorption and separation, − chemical sensing, , biomedicine, , catalysis, − etc. As reported by Yang et al, Pd nanocubes@ZIF-8 catalysts were prepared by encapsulating Pd nanocubes within ZIF-8 for olefin hydrogenation, and the catalysts exhibited efficient performance in selective hydrogenation.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Pd@CN Catalysts with Quasi-Ordered Mesopores Synthesized from Recycled Mother Liquid of Zeolitic Imidazolate Frameworks

Liu

Shao

et al. 2022

ACS Sustainable Chem. Eng.

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Zeolitic imidazolate frameworks (ZIFs) are promising porous materials; however, the mother liquid after crystallization was often thrown away, causing the waste of resources and environmental pollution. Therefore, it is urgent to develop methods for realizing the recycling utilization of the mother liquid of ZIFs. Herein, unreacted Co ions, imidazole linkers, and possibly intermediate precursor species in the mother liquid of ZIF-67 were recovered by rotary evaporation (marked as ZIF(Re)) and employed to synthesize porous carbon materials via one-step calcination. After pickling and Pd loading, the hierarchically porous Pd@CN catalysts were obtained, and the porous structures can be tuned by modulating the calcination temperature and pickling time. The as-fabricated Pd@CN-800-60 catalyst demonstrates comparable properties to the ZIF-67-derived catalyst Pd@CN(67)-800-60 not only in porous structures but also in hydrogenation ability (a turnover frequency (TOF) of 109.56 h −1 for the phenol hydrogenation to cyclohexanone). Moreover, the porous structures of Pd@CN-800-60 are relatively more ordered than Pd@CN(67)-800-60, and the quasi-ordered mesoporous structures strengthen the permeation of substrates and the accessibility of active components. More importantly, the productivity of Pd@CN-800-60 is 3.4 times higher than that of Pd@CN(67)-800-60. From a sustainable perspective, this study provides not only an efficient approach for recycling the mother liquid of ZIFs but also a low-cost procedure for preparing efficient Pd@CN catalysts with quasi-ordered mesoporous structures.

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Improved C3H6/C3H8 separation performance on ZIF-8 membranes through enhancing PDMS contact-dependent confinement effect

Cited by 17 publications

References 50 publications

In situ assembly of one-dimensional Pt@ZnO nanofibers driven by a ZIF-8 framework for achieving a high-performance acetone sensor

In situ assembly of one-dimensional Pt@ZnO nanofibers driven by a ZIF-8 framework for achieving a high-performance acetone sensor

Annealing and TMOS coating on PSF/ZTC mixed matrix membrane for enhanced CO₂/CH₄and H₂/CH₄separation

Highly Efficient Pd@CN Catalysts with Quasi-Ordered Mesopores Synthesized from Recycled Mother Liquid of Zeolitic Imidazolate Frameworks

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Improved C3H6/C3H8 separation performance on ZIF-8 membranes through enhancing PDMS contact-dependent confinement effect

Cited by 17 publications

References 50 publications

In situ assembly of one-dimensional Pt@ZnO nanofibers driven by a ZIF-8 framework for achieving a high-performance acetone sensor

In situ assembly of one-dimensional Pt@ZnO nanofibers driven by a ZIF-8 framework for achieving a high-performance acetone sensor

Annealing and TMOS coating on PSF/ZTC mixed matrix membrane for enhanced CO2/CH4and H2/CH4separation

Highly Efficient Pd@CN Catalysts with Quasi-Ordered Mesopores Synthesized from Recycled Mother Liquid of Zeolitic Imidazolate Frameworks

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Annealing and TMOS coating on PSF/ZTC mixed matrix membrane for enhanced CO₂/CH₄and H₂/CH₄separation