Efficient Separation of Xylene Isomers by a Pillar-Layer Metal–Organic Framework

Yang, Liping; Liu, Hanbang; Yuan, Ding; Xing, Jiacheng; Xu, Yunpeng; Liu, Zhongmin

doi:10.1021/acsami.1c10462

Cited by 20 publications

(9 citation statements)

References 37 publications

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“…Solid adsorbents, such as MFI-type zeolites (7), molecular crystals (8)(9)(10), metal complexes (11,12), organic cages (13), and metal-organic frameworks (MOFs) (14)(15)(16)(17)(18)(19)(20), have been investigated for the separation of xylene isomers. A particular feature of dynamic MOFs is their framework flexibility, which has led to interesting and unexpected adsorption properties (21)(22)(23)(24).…”

mentioning

confidence: 99%

Discrimination of xylene isomers in a stacked coordination polymer

Guo

Olson

et al. 2022

Science

125

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The separation and purification of xylene isomers is an industrially important but challenging process. Developing highly efficient adsorbents is crucial for the implementation of simulated moving bed technology for industrial separation of these isomers. Herein, we report a stacked one-dimensional coordination polymer {[Mn(dhbq)(H 2 O) 2 ], H 2 dhbq = 2,5-dihydroxy-1,4-benzoquinone} that exhibits an ideal molecular recognition and sieving of xylene isomers. Its distinct temperature-adsorbate–dependent adsorption behavior enables full separation of p -, m -, and o -xylene isomers in both vapor and liquid phases. The delicate stimuli-responsive swelling of the structure imparts this porous material with exceptionally high flexibility and stability, well-balanced adsorption capacity, high selectivity, and fast kinetics at conditions mimicking industrial settings. This study may offer an alternative approach for energy-efficient and adsorption-based industrial xylene separation and purification processes.

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confidence: 99%

Discrimination of xylene isomers in a stacked coordination polymer

Guo

Olson

et al. 2022

Science

125

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“…Gong et al targeted efficient C 2 H 2 /CO 2 separation by reticulating preselected amino and hydroxyl functional groups of the ultra-microporous chiral Ni-MOF. Among MOF materials, pillar-layered MOF materials are emerging as a new type of MOF materials with record adsorption selectivity to light alkane/olefin and chiral sorption, resulting from the specific pore/channel surface chemistry or pore size/shape difference, − which recently attract intensive interest and are considered to be one of the most promising materials for separation. However, to the best of our knowledge, there were only a few reports on pillar-layered MOF membranes despite their potential unique separation ability for target mixtures probably because the presence of dual ligands makes it more difficult to form selective membranes successfully.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Ultra-microporous Pillar-Layered Metal–Organic Framework Membranes for Highly H₂-Selective Separation

Yan

Yang

et al. 2023

ACS Appl. Mater. Interfaces

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Recently, pillar-layered MOF materials have attracted much attention and shown great potential in separation application due to their fine pore size/channel and pore surface chemistry tunability and designability. In this work, we reported an effective and universal synthesis strategy for preparing ultra-microporous Ni-based pillar-layered MOF [Ni2(L-asp)2(bpy)] (Ni-LAB) and [Ni2(L-asp)2(pz)] (Ni-LAP) (L-asp = L-aspartic acid, bpy = 4,4′-bipyridine, pz = pyrazine) membranes on a porous α-Al2O3 substrate with high performance and good stability by secondary growth. Through this strategy, the seed size reduction and screening engineering (SRSE) is proposed to obtain uniform sub-micron size MOF seeds by high-energy ball milling-combined solvent deposition. This strategy not only effectively addresses the issue of obtaining the uniform small seeds being significant for secondary growth but also provides an approach for the preparation of Ni-based pillar-layered MOF membranes where the freedom of synthesizing small crystals is lacking. Based on reticular chemistry, the pore size of Ni-LAB was narrowed by making use of shorter pillar ligands of pz instead of the longer pillar ligand of bpy. The prepared ultra-microporous Ni-LAP membranes exhibited a high H2/CO2 separation factor of 40.4 with H2 permeance of 9.69 × 10–8 mol m–2 s–1 Pa–1 under ambient conditions and good mechanical and thermal stability. The superiority of the tunable pore structure and the remarkable stability of these MOF materials showed great potential for industrial H2 purification. More importantly, our synthesis strategy demonstrated the generality for preparation of MOF membranes, enabling the regulation of membrane pore size and surface functional groups by reticular chemistry.

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“…The polycyclic aromatic hydrocarbons (PAHs) in fluid catalytic cracking (FCC) diesel reduce the cetane value of FCC diesel and cause serious environmental pollution. , Adsorption technology is a promising method for the removal of PAHs under mild conditions, and the design and synthesis of PAH adsorbents with high capacity and selectivity is crucial. , In recent years, the adsorption and separation of benzene–toluene–xylene (BTX) from aliphatic compounds with different porous materials, such as zeolites, metal organic frameworks (MOFs), , and porous molecular solids, , have been studied. But as for PAHs, only a few adsorbents, for example, zeolites, coordination polymers, , covalent organic frameworks (COFs), and porous organic polymers (POPs), were reported.…”

Section: Introductionmentioning

confidence: 99%

Carbazole-Based Porous Organic Polymers with Ag(I) Doping and Derived Porous Carbon for Enhanced Adsorption of Polycyclic Aromatic Hydrocarbons

Cui,

Zhang,

Liu

et al. 2023

Macromolecules

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The polycyclic aromatic hydrocarbons (PAHs) are important chemical raw materials and are abundant in fluid catalytic cracking (FCC) diesel. Adsorption is an effective method to extract PAHs from FCC diesel. Here, carbazole-based porous organic polymers were synthesized as fundamental adsorbents which contained a highly conjugated system and heteroatom (N). Ag(I) doping and direct carbonization were used to enhance the PAHs’ adsorption capacity. The carbonized P1-C-1000 possessed a high BET surface area (1101 m2 g–1) and exhibited excellent PAH adsorption capacity (41.73 mg/g, naphthalene; 104.18 mg/g, anthracene), which was due to the high porosity, π–π conjugated interaction, and p−π conjugated interaction between N atoms and PAHs. The introduction of cation−π, π–π, and p−π interactions in porous materials provides a highly efficient approach in the removal of aromatics.

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Efficient Separation of Xylene Isomers by a Pillar-Layer Metal–Organic Framework

Cited by 20 publications

References 37 publications

Discrimination of xylene isomers in a stacked coordination polymer

Discrimination of xylene isomers in a stacked coordination polymer

Facile Synthesis of Ultra-microporous Pillar-Layered Metal–Organic Framework Membranes for Highly H₂-Selective Separation

Carbazole-Based Porous Organic Polymers with Ag(I) Doping and Derived Porous Carbon for Enhanced Adsorption of Polycyclic Aromatic Hydrocarbons

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Efficient Separation of Xylene Isomers by a Pillar-Layer Metal–Organic Framework

Cited by 20 publications

References 37 publications

Discrimination of xylene isomers in a stacked coordination polymer

Discrimination of xylene isomers in a stacked coordination polymer

Facile Synthesis of Ultra-microporous Pillar-Layered Metal–Organic Framework Membranes for Highly H2-Selective Separation

Carbazole-Based Porous Organic Polymers with Ag(I) Doping and Derived Porous Carbon for Enhanced Adsorption of Polycyclic Aromatic Hydrocarbons

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Facile Synthesis of Ultra-microporous Pillar-Layered Metal–Organic Framework Membranes for Highly H₂-Selective Separation