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152 results on '"Chen, Cheng‐Xia"'

4. Enhancing Acetylene/Ethylene Separation through Cation Exchange in an Anion-Pillared Hybrid Ultramicroporous MOF

Author

Xiong, Yang-Yang, Chen, Huai, Chen, Cheng-Xia, Lan, Bang, Pham, Tony, Forrest, Katherine A., Wei, Zhang-Wen, Pan, Mei, and Su, Cheng-Yong

Abstract

The purification of ethylene (C2H4) from a mixture of acetylene/ethylene (C2H2/C2H4) gases is of great importance for manufacturing various downstream commodities; however, it is highly challenging due to their similar physicochemical properties. Herein, two hybrid ultramicroporous materials, LIFM-107(Cu/Ni), featuring functionalized hexafluorosilicate (SiF62–) anions and a small pore size, are successfully constructed through a cation-exchange protocol for efficient C2H2/C2H4separation. Compared with the prototypical LIFM-107(Zn), the resultant LIFM-107(Cu/Ni), especially for LIFM-107(Cu), showcases improved C2H2/C2H4separation performance demonstrated by the transient breakthrough experiments. Additionally, the underlying gas adsorption mechanism has been well established by in situ infrared spectroscopy experiments and molecular modeling, in which a strong C2H2-nanotrap stemming from the strong C–H···F hydrogen bonds interactions and C≡C···H/C–H···π forces plays a pivotal role in the preferential C2H2adsorption process.

Published
2024
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5. Isoreticular Contraction of Cage-like Metal–Organic Frameworks with Optimized Pore Space for Enhanced C2H2/CO2and C2H2/C2H4Separations

Author

Zhang, Lei, Xiao, Taotao, Zeng, Xiayun, You, Jianjun, He, Ziyu, Chen, Cheng-Xia, Wang, Qianting, Nafady, Ayman, Al-Enizi, Abdullah M., and Ma, Shengqian

Abstract

The C2H2separation from CO2and C2H4is of great importance yet highly challenging in the petrochemical industry, owing to their similar physical and chemical properties. Herein, the pore nanospace engineering of cage-like mixed-ligand MFOF-1 has been accomplished via contracting the size of the pyridine- and carboxylic acid-functionalized linkers and introducing a fluoride- and sulfate-bridging cobalt cluster, based on a reticular chemistry strategy. Compared with the prototypical MFOF-1, the constructed FJUT-1 with the same topology presents significantly improved C2H2adsorption capacity, and selective C2H2separation performance due to the reduced cage cavity size, functionalized pore surface, and appropriate pore volume. The introduction of fluoride- and sulfate-bridging cubane-type tetranuclear cobalt clusters bestows FJUT-1 with exceptional chemical stability under harsh conditions while providing multiple potential C2H2binding sites, thus rendering the adequate ability for practical C2H2separation application as confirmed by the dynamic breakthrough experiments under dry and humid conditions. Additionally, the distinct binding mechanism is suggested by theoretical calculations in which the multiple supramolecular interactions involving C–H···O, C–H···F, and other van der Waals forces play a critical role in the selective C2H2separation.

Published
2024
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13. Pore-Nanospace Engineering of Mixed-Ligand Metal–Organic Frameworks for High Adsorption of Hydrofluorocarbons and Hydrochlorofluorocarbons

Author

Xiong, Yang-Yang, primary, Krishna, Rajamani, additional, Pham, Tony, additional, Forrest, Katherine A., additional, Chen, Cheng-Xia, additional, Wei, Zhang-Wen, additional, Jiang, Ji-Jun, additional, Wang, Hai-Ping, additional, Fan, Yanan, additional, Pan, Mei, additional, and Su, Cheng-Yong, additional

Published
2022
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15. Nanospace Engineering of Metal–Organic Frameworks through Dynamic Spacer Installation of Multifunctionalities for Efficient Separation of Ethane from Ethane/Ethylene Mixtures

Author

Chen, Cheng‐Xia, primary, Wei, Zhang‐Wen, additional, Pham, Tony, additional, Lan, Pui Ching, additional, Zhang, Lei, additional, Forrest, Katherine A., additional, Chen, Sha, additional, Al‐Enizi, Abdullah M., additional, Nafady, Ayman, additional, Su, Cheng‐Yong, additional, and Ma, Shengqian, additional

Published
2021
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17. High Water Adsorption MOFs with Optimized Pore‐Nanospaces for Autonomous Indoor Humidity Control and Pollutants Removal.

Author

Zhu, Neng‐Xiu, Wei, Zhang‐Wen, Chen, Cheng‐Xia, Xiong, Xiao‐Hong, Xiong, Yang‐Yang, Zeng, Zheng, Wang, Wei, Jiang, Ji‐Jun, Fan, Ya‐Nan, and Su, Cheng‐Yong

Subjects
HUMIDITY control, HUMIDITY, POLLUTANTS, INDOOR air pollution, INDOOR air quality, DISTRIBUTION isotherms (Chromatography), METAL-organic frameworks, ADSORPTION (Chemistry)
Abstract

The indoor air quality is of prime importance for human daily life and health, for which the adsorbents like zeolites and silica‐gels are widely used for air dehumidification and harmful gases capture. Herein, we develop a pore‐nanospace post‐engineering strategy to optimize the hydrophilicity, water‐uptake capacity and air‐purifying ability of metal‐organic frameworks (MOFs) with long‐term stability, offering an ideal candidate with autonomous multi‐functionality of moisture control and pollutants sequestration. Through variant tuning of organic‐linkers carrying hydrophobic and hydrophilic groups in the pore‐nanospaces of prototypical UiO‐67, a moderately hydrophilic MOF (UiO‐67‐4Me‐NH2‐38 %) with high thermal, hydrolytic and acid‐base stability is screened out, featuring S‐shaped water sorption isotherms exactly located in the recommended comfortable and healthy ranges of relative humidity for indoor ventilation (45 %–65 % RH) and adverse health effects minimization (40–60 % RH). Its exceptional attributes of water‐uptake working capacity/efficiency, contaminants removal, recyclability and regeneration promise a great potential in confined indoor environment application. [ABSTRACT FROM AUTHOR]

Published
2022
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18. Enhancing Photocatalytic Hydrogen Production via the Construction of Robust Multivariate Ti‐MOF/COF Composites.

Author

Chen, Cheng‐Xia, Xiong, Yang‐Yang, Zhong, Xin, Lan, Pui Ching, Wei, Zhang‐Wen, Pan, Hongjun, Su, Pei‐Yang, Song, Yujie, Chen, Yi‐Fan, Nafady, Ayman, Sirajuddin, and Ma, Shengqian

Subjects
*SOLAR energy conversion, *HYDROGEN production, *METAL-organic frameworks, *BAND gaps, *PHOTOCATALYSTS, *SILVER, *HYDROGEN evolution reactions
Abstract

Titanium metal–organic frameworks (Ti‐MOFs), as an appealing type of artificial photocatalyst, have shown great potential in the field of solar energy conversion due to their well‐studied photoredox activity (similar to TiO2) and good optical responsiveness of linkers, which serve as the antenna to absorb visible‐light. Although much effort has been dedicated to developing Ti‐MOFs with high photocatalytic activity, their solar energy conversion performances are still poor. Herein, we have implemented a covalent‐integration strategy to construct a series of multivariate Ti‐MOF/COF hybrid materials PdTCPP⊂PCN‐415(NH2)/TpPa (composites 1, 2, and 3), featuring excellent visible‐light utilization, a suitable band gap, and high surface area for photocatalytic H2 production. Notably, the resulting composites demonstrated remarkably enhanced visible‐light‐driven photocatalytic H2 evolution performance, especially for the composite 2 with a maximum H2 evolution rate of 13.98 mmol g−1 h−1 (turnover frequency (TOF)=227 h−1), which is much higher than that of PdTCPP⊂PCN‐415(NH2) (0.21 mmol g−1 h−1) and TpPa (6.51 mmol g−1 h−1). Our work thereby suggests a new approach to highly efficient photocatalysts for H2 evolution and beyond. [ABSTRACT FROM AUTHOR]

Published
2022
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19. Cover Feature: Dynamic Coordination Chemistry of Fluorinated Zr‐MOFs: Synthetic Control and Reassembly/Disassembly Beyond de Novo Synthesis to Tune the Structure and Property (Chem. Eur. J. 37/2020)

Author

Chen, Cheng‐Xia, primary, Fan, Yan‐Zhong, additional, Cao, Chen‐Chen, additional, Wang, Hai‐Ping, additional, Fan, Ya‐Nan, additional, Jiang, Ji‐Jun, additional, Wei, Zhang‐Wen, additional, Maurin, Guillaume, additional, and Su, Cheng‐Yong, additional

Published
2020
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30. A Flexible Cu-MOF as Crystalline Sponge for Guests Determination

Author

Qiu, Qian-feng, Chen, Cheng-Xia, Wei, Zhang-Wen, Cao, Chen-Chen, Zhu, Neng-Xiu, Wang, Hai-Ping, Wang, Dawei, Jiang, Ji-Jun, and Su, Cheng-Yong

Abstract

A trifluoromethyl functionalized linker and Cu-O chain composed MOF, LIFM-100, was used as “crystalline sponge” to determine eight hardly crystallized liquids’ configurations based on its flexibility conformation, suitable pore size, electron-rich channel environment, and low symmetric space group. The H bond interactions between host–guest and guest–guest were well analyzed.

Published
2024
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42. Ligand and Metal Effects on the Stability and Adsorption Properties of an Isoreticular Series of MOFs Based on T-Shaped Ligands and Paddle-Wheel Secondary Building Units

Author

Xiong, Ying, primary, Fan, Yan-Zhong, additional, Damasceno Borges, Daiane, additional, Chen, Cheng-Xia, additional, Wei, Zhang-Wen, additional, Wang, Hai-Ping, additional, Pan, Mei, additional, Jiang, Ji-Jun, additional, Maurin, Guillaume, additional, and Su, Cheng-Yong, additional

Published
2016
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47. Hydrophobic metallo-supramolecular Pd2L4 cages for zwitterionic guest encapsulation in organic solvents.

Author

Li, Yu-Hao, Zhang, Yan, Legrand, Yves-Marie, van der Lee, Arie, Jiang, Ji-Jun, Chen, Cheng-Xia, Su, Cheng-Yong, and Barboiu, Mihail

Subjects
HYDROPHOBIC interactions, SUPRAMOLECULAR chemistry, SYNERGETICS
Abstract

Hydrophilic zwitterionic guest encapsulation by metallo-supramolecular cages through synergetic coordination, H-bonding and hydrophobic interactions. [ABSTRACT FROM AUTHOR]

Published
2017
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48. Stepwise engineering of pore environments and enhancement of CO2/R22 adsorption capacity through dynamic spacer installation and functionality modification.

Author

Chen, Cheng-Xia, Qiu, Qian-Feng, Cao, Chen-Chen, Pan, Mei, Wang, Hai-Ping, Jiang, Ji-Jun, Wei, Zhang-Wen, Zhu, Kelong, Li, Guangqin, and Su, Cheng-Yong

Subjects
*ADSORPTION (Chemistry), *CHEMICAL reactions
Abstract

Through stepwise post-synthetic spacer insertion and click reactions, six Zr-MOFs with different types and amounts of functional groups have been constructed based on proto-MOF PCN-700. Their gas adsorption capacities and selectivities have been greatly improved and finely tuned, demonstrating the combinatorial effect of pore surface modification and pore space partition. [ABSTRACT FROM AUTHOR]

Published
2017
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49. Metal Effects on the Framework Stability and Adsorption Property of a Series of Isoreticular Metal–Organic Frameworks Based on an in-Situ Generated T-Shaped Ligand

Author

Xiong, Ying, Yang, Tao, Chen, Sha, Zhang, Chang-He, Chen, Cheng-Xia, Wei, Zhang-Wen, Wang, Dawei, Jiang, Ji-Jun, and Su, Cheng-Yong

Abstract

An in situ approach has been undertaken to synthesize a series of metal–organic frameworks (MOFs) with the pore surface functionalized via the organic linkers of multi N-heterocycles. This was done so as to explore their stability, flexibility, and adsorption behaviors on the basis of the nature of metal centers (M = Zn, Mg, Co, Ni). Four isoreticular MOFs based on in situ synthesized T-shaped ligands were obtained, and their phase purity and stability were investigated in conjunction with the adsorption properties for a wide range of gases (Ar, N2, H2, CO2, CH4, C2H6, C2H4, C3H8, and C3H6). The results revealed that the stability of MOF based on Ni2+is better than those of Mg, Zn, and Co analogues, and that the multi N-heterocycles ligand endows these MOFs with higher affinity for CO2, C2H6, C2H4, C3H8, and C3H6, leading to an excellent selectivity for these gases over CH4.

Published
2019
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50. A Robust Metal-Organic Framework Combining Open Metal Sites and Polar Groups for Methane Purification and CO2/Fluorocarbon Capture.

Author

Chen, Cheng‐Xia, Zheng, Shao‐Ping, Wei, Zhang‐Wen, Cao, Chen‐Chen, Wang, Hai‐Ping, Wang, Dawei, Jiang, Ji‐Jun, Fenske, Dieter, and Su, Cheng‐Yong

Subjects
*METAL-organic frameworks, *METHANE analysis, *FLUOROCARBONS, *CARBON dioxide, *FLUOROBENZENE, *CHEMICAL stability, *POLARIZATION (Nuclear physics)
Abstract

A 3D porous perchlorinated metal-organic framework (MOF), LIFM-26, featuring dual functionality, that is, functional polar groups and open metal sites, has been synthesized using perchlorinated linear dicarboxylate to link trigonal prismatic Fe3(μ3-O) units. LIFM-26 exhibits good thermal and chemical stability, and possesses high porosity with a BET surface area of 1513 m2 g−1, compared with isoreticular MOF-235 and Fe3O(F4BDC)3(H2O)3 (F4BDC=2,3,5,6-tetrafluorobenzene-1,4-dicarboxylate). Most strikingly, LIFM-26 features good gas sorption/separation performance at 298 K and 1 atm with IAST selectivity values reaching up to 36, 93, 23, 11, 46, and 202 for CO2/CH4, CO2/N2, C2H4/CH4, C2H6/CH4, C3H8/CH4, and R22/N2 (R22=CHClF2), respectively, showing potential for use in biogas/natural gas purification and CO2/R22 capture. [ABSTRACT FROM AUTHOR]

Published
2017
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