The Experts below are selected from a list of 4692 Experts worldwide ranked by ideXlab platform

Qilong Ren - One of the best experts on this subject based on the ideXlab platform.

  • Engineering the Pore Size of Pillared-Layer Coordination Polymers Enables Highly Efficient Adsorption Separation of Acetylene from Ethylene.
    ACS applied materials & interfaces, 2019
    Co-Authors: Fang Zheng, Lidong Guo, Bixuan Gao, Zhiguo Zhang, Qiwei Yang, Yiwen Yang, Qilong Ren, Zongbi Bao
    Abstract:

    The Pore Size of adsorbents plays a vital role in determining the overall separation performance of gas separation and purification by adsorption. In this work, the Pore apertures of the coordination pillared layer (CPL) was systematically controlled by adjusting the length of pillared ligands. We used pyrazine, 4,4'-bipyridine, and 1,2-di(4-pyridyl)-ethylene with increased length to syntheSize CPL-1 (L = pyrazine), CPL-2 (L = 4,4'-bipyridine), and CPL-5 [L = 1,2-di(4-pyridyl)-ethylene], respectively. The aperture Size of these CPLs varies from 4 to 11 Å: CPL-1 (4 × 6 Å2), CPL-2 (9 × 6 Å2), and CPL-5 (11 × 6 Å2). Among the three frameworks, CPL-2 exhibits the highest C2H2 uptake at ambient conditions as it has moderate Pore Size and porosity. However, CPL-1 has the best separation performance in the breakthrough experiments with binary gas mixture of C2H2/C2H4, thanks to the Optimal Pore Size nearly excluding C2H4, which is only observed in the state-of-the-art UTSA-300a so far. The DFT calculations were carried out to elucidate the specific adsorption sites for both acetylene and ethylene among these frameworks. The modeling results suggest that binding strength is highly related to aperture Size and that CPL-1 shows the highest adsorption selectivity owing to the Optimal Pore Size. This work demonstrates that engineering Pore Size enables us to fabricate the highly efficient metal-organic framework (MOF)-based adsorbents for specific gas separation on the basis of the isoreticular chemistry.

  • A Robust Squarate-Based Metal-Organic Framework Demonstrates Record-High Affinity and Selectivity for Xenon over Krypton.
    Journal of the American Chemical Society, 2019
    Co-Authors: Lidong Guo, Zhiguo Zhang, Qiwei Yang, Yiwen Yang, Zongbi Bao, Qilong Ren
    Abstract:

    The efficient separation of xenon (Xe) and krypton (Kr) is one of the industrially important processes. While adsorptive separation of these two species is considered to be an energy efficient process, developing highly selective adsorbent remains challenging. Herein, a rigid squarate-based metal-organic framework (MOF), having a perfect Pore Size (4.1 A × 4.3 A) comparable with the kinetic diameter of Xe (4.047 A) as well as Pore surface decorated with very polar hydroxyl groups, is able to effectively discriminate Xe atoms, affording a record-high Xe/Kr selectivity. An exceptionally high Xe uptake capacity of 58.4 cm3/cm3 and selectivity of 60.6 at low pressure (0.2 bar) are achieved at ambient temperature. The MOF exhibits the highest Xe Henry coefficient (192.1 mmol/g/bar) and Xe/Kr Henry selectivity (54.1) among all state-of-the-art adsorbents reported so far. Direct breakthrough experiments further confirm the excellent separation performance. The density functional theory calculations reveal that the strong interaction between Xe and the framework is a result of the synergy between Optimal Pore Size and polar porosity.

  • A Robust Squarate-Based Metal–Organic Framework Demonstrates Record-High Affinity and Selectivity for Xenon over Krypton
    2019
    Co-Authors: Lidong Guo, Zhiguo Zhang, Qiwei Yang, Yiwen Yang, Zongbi Bao, Qilong Ren
    Abstract:

    The efficient separation of xenon (Xe) and krypton (Kr) is one of the industrially important processes. While adsorptive separation of these two species is considered to be an energy efficient process, developing highly selective adsorbent remains challenging. Herein, a rigid squarate-based metal–organic framework (MOF), having a perfect Pore Size (4.1 Å × 4.3 Å) comparable with the kinetic diameter of Xe (4.047 Å) as well as Pore surface decorated with very polar hydroxyl groups, is able to effectively discriminate Xe atoms, affording a record-high Xe/Kr selectivity. An exceptionally high Xe uptake capacity of 58.4 cm3/cm3 and selectivity of 60.6 at low pressure (0.2 bar) are achieved at ambient temperature. The MOF exhibits the highest Xe Henry coefficient (192.1 mmol/g/bar) and Xe/Kr Henry selectivity (54.1) among all state-of-the-art adsorbents reported so far. Direct breakthrough experiments further confirm the excellent separation performance. The density functional theory calculations reveal that the strong interaction between Xe and the framework is a result of the synergy between Optimal Pore Size and polar porosity

Zongbi Bao - One of the best experts on this subject based on the ideXlab platform.

  • Engineering the Pore Size of Pillared-Layer Coordination Polymers Enables Highly Efficient Adsorption Separation of Acetylene from Ethylene.
    ACS applied materials & interfaces, 2019
    Co-Authors: Fang Zheng, Lidong Guo, Bixuan Gao, Zhiguo Zhang, Qiwei Yang, Yiwen Yang, Qilong Ren, Zongbi Bao
    Abstract:

    The Pore Size of adsorbents plays a vital role in determining the overall separation performance of gas separation and purification by adsorption. In this work, the Pore apertures of the coordination pillared layer (CPL) was systematically controlled by adjusting the length of pillared ligands. We used pyrazine, 4,4'-bipyridine, and 1,2-di(4-pyridyl)-ethylene with increased length to syntheSize CPL-1 (L = pyrazine), CPL-2 (L = 4,4'-bipyridine), and CPL-5 [L = 1,2-di(4-pyridyl)-ethylene], respectively. The aperture Size of these CPLs varies from 4 to 11 Å: CPL-1 (4 × 6 Å2), CPL-2 (9 × 6 Å2), and CPL-5 (11 × 6 Å2). Among the three frameworks, CPL-2 exhibits the highest C2H2 uptake at ambient conditions as it has moderate Pore Size and porosity. However, CPL-1 has the best separation performance in the breakthrough experiments with binary gas mixture of C2H2/C2H4, thanks to the Optimal Pore Size nearly excluding C2H4, which is only observed in the state-of-the-art UTSA-300a so far. The DFT calculations were carried out to elucidate the specific adsorption sites for both acetylene and ethylene among these frameworks. The modeling results suggest that binding strength is highly related to aperture Size and that CPL-1 shows the highest adsorption selectivity owing to the Optimal Pore Size. This work demonstrates that engineering Pore Size enables us to fabricate the highly efficient metal-organic framework (MOF)-based adsorbents for specific gas separation on the basis of the isoreticular chemistry.

  • A Robust Squarate-Based Metal-Organic Framework Demonstrates Record-High Affinity and Selectivity for Xenon over Krypton.
    Journal of the American Chemical Society, 2019
    Co-Authors: Lidong Guo, Zhiguo Zhang, Qiwei Yang, Yiwen Yang, Zongbi Bao, Qilong Ren
    Abstract:

    The efficient separation of xenon (Xe) and krypton (Kr) is one of the industrially important processes. While adsorptive separation of these two species is considered to be an energy efficient process, developing highly selective adsorbent remains challenging. Herein, a rigid squarate-based metal-organic framework (MOF), having a perfect Pore Size (4.1 A × 4.3 A) comparable with the kinetic diameter of Xe (4.047 A) as well as Pore surface decorated with very polar hydroxyl groups, is able to effectively discriminate Xe atoms, affording a record-high Xe/Kr selectivity. An exceptionally high Xe uptake capacity of 58.4 cm3/cm3 and selectivity of 60.6 at low pressure (0.2 bar) are achieved at ambient temperature. The MOF exhibits the highest Xe Henry coefficient (192.1 mmol/g/bar) and Xe/Kr Henry selectivity (54.1) among all state-of-the-art adsorbents reported so far. Direct breakthrough experiments further confirm the excellent separation performance. The density functional theory calculations reveal that the strong interaction between Xe and the framework is a result of the synergy between Optimal Pore Size and polar porosity.

  • A Robust Squarate-Based Metal–Organic Framework Demonstrates Record-High Affinity and Selectivity for Xenon over Krypton
    2019
    Co-Authors: Lidong Guo, Zhiguo Zhang, Qiwei Yang, Yiwen Yang, Zongbi Bao, Qilong Ren
    Abstract:

    The efficient separation of xenon (Xe) and krypton (Kr) is one of the industrially important processes. While adsorptive separation of these two species is considered to be an energy efficient process, developing highly selective adsorbent remains challenging. Herein, a rigid squarate-based metal–organic framework (MOF), having a perfect Pore Size (4.1 Å × 4.3 Å) comparable with the kinetic diameter of Xe (4.047 Å) as well as Pore surface decorated with very polar hydroxyl groups, is able to effectively discriminate Xe atoms, affording a record-high Xe/Kr selectivity. An exceptionally high Xe uptake capacity of 58.4 cm3/cm3 and selectivity of 60.6 at low pressure (0.2 bar) are achieved at ambient temperature. The MOF exhibits the highest Xe Henry coefficient (192.1 mmol/g/bar) and Xe/Kr Henry selectivity (54.1) among all state-of-the-art adsorbents reported so far. Direct breakthrough experiments further confirm the excellent separation performance. The density functional theory calculations reveal that the strong interaction between Xe and the framework is a result of the synergy between Optimal Pore Size and polar porosity

Lidong Guo - One of the best experts on this subject based on the ideXlab platform.

  • Engineering the Pore Size of Pillared-Layer Coordination Polymers Enables Highly Efficient Adsorption Separation of Acetylene from Ethylene.
    ACS applied materials & interfaces, 2019
    Co-Authors: Fang Zheng, Lidong Guo, Bixuan Gao, Zhiguo Zhang, Qiwei Yang, Yiwen Yang, Qilong Ren, Zongbi Bao
    Abstract:

    The Pore Size of adsorbents plays a vital role in determining the overall separation performance of gas separation and purification by adsorption. In this work, the Pore apertures of the coordination pillared layer (CPL) was systematically controlled by adjusting the length of pillared ligands. We used pyrazine, 4,4'-bipyridine, and 1,2-di(4-pyridyl)-ethylene with increased length to syntheSize CPL-1 (L = pyrazine), CPL-2 (L = 4,4'-bipyridine), and CPL-5 [L = 1,2-di(4-pyridyl)-ethylene], respectively. The aperture Size of these CPLs varies from 4 to 11 Å: CPL-1 (4 × 6 Å2), CPL-2 (9 × 6 Å2), and CPL-5 (11 × 6 Å2). Among the three frameworks, CPL-2 exhibits the highest C2H2 uptake at ambient conditions as it has moderate Pore Size and porosity. However, CPL-1 has the best separation performance in the breakthrough experiments with binary gas mixture of C2H2/C2H4, thanks to the Optimal Pore Size nearly excluding C2H4, which is only observed in the state-of-the-art UTSA-300a so far. The DFT calculations were carried out to elucidate the specific adsorption sites for both acetylene and ethylene among these frameworks. The modeling results suggest that binding strength is highly related to aperture Size and that CPL-1 shows the highest adsorption selectivity owing to the Optimal Pore Size. This work demonstrates that engineering Pore Size enables us to fabricate the highly efficient metal-organic framework (MOF)-based adsorbents for specific gas separation on the basis of the isoreticular chemistry.

  • A Robust Squarate-Based Metal-Organic Framework Demonstrates Record-High Affinity and Selectivity for Xenon over Krypton.
    Journal of the American Chemical Society, 2019
    Co-Authors: Lidong Guo, Zhiguo Zhang, Qiwei Yang, Yiwen Yang, Zongbi Bao, Qilong Ren
    Abstract:

    The efficient separation of xenon (Xe) and krypton (Kr) is one of the industrially important processes. While adsorptive separation of these two species is considered to be an energy efficient process, developing highly selective adsorbent remains challenging. Herein, a rigid squarate-based metal-organic framework (MOF), having a perfect Pore Size (4.1 A × 4.3 A) comparable with the kinetic diameter of Xe (4.047 A) as well as Pore surface decorated with very polar hydroxyl groups, is able to effectively discriminate Xe atoms, affording a record-high Xe/Kr selectivity. An exceptionally high Xe uptake capacity of 58.4 cm3/cm3 and selectivity of 60.6 at low pressure (0.2 bar) are achieved at ambient temperature. The MOF exhibits the highest Xe Henry coefficient (192.1 mmol/g/bar) and Xe/Kr Henry selectivity (54.1) among all state-of-the-art adsorbents reported so far. Direct breakthrough experiments further confirm the excellent separation performance. The density functional theory calculations reveal that the strong interaction between Xe and the framework is a result of the synergy between Optimal Pore Size and polar porosity.

  • A Robust Squarate-Based Metal–Organic Framework Demonstrates Record-High Affinity and Selectivity for Xenon over Krypton
    2019
    Co-Authors: Lidong Guo, Zhiguo Zhang, Qiwei Yang, Yiwen Yang, Zongbi Bao, Qilong Ren
    Abstract:

    The efficient separation of xenon (Xe) and krypton (Kr) is one of the industrially important processes. While adsorptive separation of these two species is considered to be an energy efficient process, developing highly selective adsorbent remains challenging. Herein, a rigid squarate-based metal–organic framework (MOF), having a perfect Pore Size (4.1 Å × 4.3 Å) comparable with the kinetic diameter of Xe (4.047 Å) as well as Pore surface decorated with very polar hydroxyl groups, is able to effectively discriminate Xe atoms, affording a record-high Xe/Kr selectivity. An exceptionally high Xe uptake capacity of 58.4 cm3/cm3 and selectivity of 60.6 at low pressure (0.2 bar) are achieved at ambient temperature. The MOF exhibits the highest Xe Henry coefficient (192.1 mmol/g/bar) and Xe/Kr Henry selectivity (54.1) among all state-of-the-art adsorbents reported so far. Direct breakthrough experiments further confirm the excellent separation performance. The density functional theory calculations reveal that the strong interaction between Xe and the framework is a result of the synergy between Optimal Pore Size and polar porosity

Daniel Tondeur - One of the best experts on this subject based on the ideXlab platform.

  • Optimal distribution of viscous dissipation in a multi-scale branched fluid distributor
    International Journal of Thermal Sciences, 2005
    Co-Authors: Lingai Luo, Daniel Tondeur
    Abstract:

    This paper examines some theoretical aspects of the Optimal design of multi-scale fluid distributors or collectors, built on a binary or quaternary branching pattern of Pores. The design aims to distribute uniformly a fluid flow over a specified square surface (uniform irrigation) while simultaneously minimizing the residence time, the residence-time distribution, the pressure drop and the viscous dissipation, leading to an optimization problem of the Pore-Size distribution, for both length and diameter. For the binary branching, the uniform distribution of outlet points requires a particular, non-monotonous scaling law for Pore lengths, and this distinguishes the structure from fractal branching patterns that have been studied previously. The quaternary branching allows a fractal-type structure (constant scale ratios for both Pore length and radius). An important general result is established: in the Optimal Pore-Size distribution, the density of viscous dissipation power (Wm-3) is uniformly distributed over the volume at all scales.

  • Optimal distribution of viscous dissipation in a multi-scale branched fluid distributor
    International Journal of Thermal Sciences, 2005
    Co-Authors: Lingai Luo, Daniel Tondeur
    Abstract:

    International audienceThis paper examines some theoretical aspects of the Optimal design of multi-scale fluid distributors or collectors, built on a binary or quaternary branching pattern of Pores. The design aims to distribute uniformly a fluid flow over a specified square surface (uniform irrigation) while simultaneously minimizing the residence time, the residence-time distribution, the pressure drop and the viscous dissipation, leading to an optimization problem of the Pore-Size distribution, for both length and diameter. For the binary branching, the uniform distribution of outlet points requires a particular, non-monotonous scaling law for Pore lengths, and this distinguishes the structure from fractal branching patterns that have been studied previously. The quaternary branching allows a fractal-type structure (constant scale ratios for both Pore length and radius). An important general result is established: in the Optimal Pore-Size distribution, the density of viscous dissipation power (Wm-3) is uniformly distributed over the volume at all scales

Yiwen Yang - One of the best experts on this subject based on the ideXlab platform.

  • Engineering the Pore Size of Pillared-Layer Coordination Polymers Enables Highly Efficient Adsorption Separation of Acetylene from Ethylene.
    ACS applied materials & interfaces, 2019
    Co-Authors: Fang Zheng, Lidong Guo, Bixuan Gao, Zhiguo Zhang, Qiwei Yang, Yiwen Yang, Qilong Ren, Zongbi Bao
    Abstract:

    The Pore Size of adsorbents plays a vital role in determining the overall separation performance of gas separation and purification by adsorption. In this work, the Pore apertures of the coordination pillared layer (CPL) was systematically controlled by adjusting the length of pillared ligands. We used pyrazine, 4,4'-bipyridine, and 1,2-di(4-pyridyl)-ethylene with increased length to syntheSize CPL-1 (L = pyrazine), CPL-2 (L = 4,4'-bipyridine), and CPL-5 [L = 1,2-di(4-pyridyl)-ethylene], respectively. The aperture Size of these CPLs varies from 4 to 11 Å: CPL-1 (4 × 6 Å2), CPL-2 (9 × 6 Å2), and CPL-5 (11 × 6 Å2). Among the three frameworks, CPL-2 exhibits the highest C2H2 uptake at ambient conditions as it has moderate Pore Size and porosity. However, CPL-1 has the best separation performance in the breakthrough experiments with binary gas mixture of C2H2/C2H4, thanks to the Optimal Pore Size nearly excluding C2H4, which is only observed in the state-of-the-art UTSA-300a so far. The DFT calculations were carried out to elucidate the specific adsorption sites for both acetylene and ethylene among these frameworks. The modeling results suggest that binding strength is highly related to aperture Size and that CPL-1 shows the highest adsorption selectivity owing to the Optimal Pore Size. This work demonstrates that engineering Pore Size enables us to fabricate the highly efficient metal-organic framework (MOF)-based adsorbents for specific gas separation on the basis of the isoreticular chemistry.

  • A Robust Squarate-Based Metal-Organic Framework Demonstrates Record-High Affinity and Selectivity for Xenon over Krypton.
    Journal of the American Chemical Society, 2019
    Co-Authors: Lidong Guo, Zhiguo Zhang, Qiwei Yang, Yiwen Yang, Zongbi Bao, Qilong Ren
    Abstract:

    The efficient separation of xenon (Xe) and krypton (Kr) is one of the industrially important processes. While adsorptive separation of these two species is considered to be an energy efficient process, developing highly selective adsorbent remains challenging. Herein, a rigid squarate-based metal-organic framework (MOF), having a perfect Pore Size (4.1 A × 4.3 A) comparable with the kinetic diameter of Xe (4.047 A) as well as Pore surface decorated with very polar hydroxyl groups, is able to effectively discriminate Xe atoms, affording a record-high Xe/Kr selectivity. An exceptionally high Xe uptake capacity of 58.4 cm3/cm3 and selectivity of 60.6 at low pressure (0.2 bar) are achieved at ambient temperature. The MOF exhibits the highest Xe Henry coefficient (192.1 mmol/g/bar) and Xe/Kr Henry selectivity (54.1) among all state-of-the-art adsorbents reported so far. Direct breakthrough experiments further confirm the excellent separation performance. The density functional theory calculations reveal that the strong interaction between Xe and the framework is a result of the synergy between Optimal Pore Size and polar porosity.

  • A Robust Squarate-Based Metal–Organic Framework Demonstrates Record-High Affinity and Selectivity for Xenon over Krypton
    2019
    Co-Authors: Lidong Guo, Zhiguo Zhang, Qiwei Yang, Yiwen Yang, Zongbi Bao, Qilong Ren
    Abstract:

    The efficient separation of xenon (Xe) and krypton (Kr) is one of the industrially important processes. While adsorptive separation of these two species is considered to be an energy efficient process, developing highly selective adsorbent remains challenging. Herein, a rigid squarate-based metal–organic framework (MOF), having a perfect Pore Size (4.1 Å × 4.3 Å) comparable with the kinetic diameter of Xe (4.047 Å) as well as Pore surface decorated with very polar hydroxyl groups, is able to effectively discriminate Xe atoms, affording a record-high Xe/Kr selectivity. An exceptionally high Xe uptake capacity of 58.4 cm3/cm3 and selectivity of 60.6 at low pressure (0.2 bar) are achieved at ambient temperature. The MOF exhibits the highest Xe Henry coefficient (192.1 mmol/g/bar) and Xe/Kr Henry selectivity (54.1) among all state-of-the-art adsorbents reported so far. Direct breakthrough experiments further confirm the excellent separation performance. The density functional theory calculations reveal that the strong interaction between Xe and the framework is a result of the synergy between Optimal Pore Size and polar porosity