Designed synthesis of porous carbons for the separation of light hydrocarbons

Xu, Shuang; Liu, Ru-Shuai; Lu, An‐Hui

doi:10.1016/j.cjche.2021.11.005

Cited by 13 publications

(4 citation statements)

References 170 publications

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“…The metal-organic framework can be built and regulated using the aforesaid separation mechanism [21,22]: (i) controlling the pore volume, pore diameter, and other pore features in the action site space; (ii) introducing a metal component, creating a strong action site in the pore, and improving the interaction between the gas molecule and the adsorbent; and (iii) adding polar components to the adsorbent s surface. Organic/inorganic ligands can be used to functionalize metal-organic frameworks and introduce polar groups onto the pore surface.…”

Section: Separation Mechanism Of Low-carbon Hydrocarbonsmentioning

confidence: 99%

Progress in the Separation and Purification of Carbon Hydrocarbon Compounds Using MOFs and Molecular Sieves

Zhou,

Li,

Wang

et al. 2023

Separations

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Carbon hydrocarbon compounds, especially low-carbon hydrocarbons (C1–C3), are vital raw materials in the petrochemical industry, but their efficient separation has great challenges due to their similar molecular structures and properties. In contrast to traditional low-temperature distillation and absorption separation technologies, selective adsorption employing porous materials as adsorbent has the advantages of low energy consumption, high efficiency, and high selectivity, indicating broad application possibilities in the field of low-carbon hydrocarbon separation. In this paper, the recent progress in the separation and purification of hydrocarbon mixtures by means of the two kinds of porous materials (metal–organic frameworks and molecular sieves) that have been widely used in recent years is reviewed, including purification of methane and separation of ethylene/ethane, propylene/propane, and some high-carbon hydrocarbon isomers. The structure–activity relationships between their chemical composition, structural characteristics, and separation performance are discussed to understand the separation mechanism. In conclusion, the issues encountered in the application of metal–organic frameworks and molecular sieves in the separation of low-carbon hydrocarbons are discussed in light of the current context of “carbon neutrality”.

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Section: Separation Mechanism Of Low-carbon Hydrocarbonsmentioning

confidence: 99%

Progress in the Separation and Purification of Carbon Hydrocarbon Compounds Using MOFs and Molecular Sieves

Zhou,

Li,

Wang

et al. 2023

Separations

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“…Light hydrocarbon separation is one of the important processes in the chemical industry [1][2][3][4][5][6]. The separated and purified light hydrocarbon compounds are important energy fuels and chemical raw materials, which are widely used in the preparation of synthetic fibers, synthetic rubbers, synthetic plastics, and organic compounds.…”

Section: Introductionmentioning

confidence: 99%

Porous Metal–Organic Frameworks for Light Hydrocarbon Separation

Gao,

Yan,

et al. 2023

Molecules

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The separation of light hydrocarbon compounds is an important process in the chemical industry. Currently, its separation methods mainly include distillation, membrane separation, and physical adsorption. However, these traditional methods or materials have some drawbacks and disadvantages, such as expensive equipment costs and high energy consumption, poor selectivity, low separation ratios, and separation efficiencies. Therefore, it is important to develop novel separation materials for light hydrocarbon separation. As a new type of organic–inorganic hybrid crystalline material, metal–organic frameworks (MOFs) are promising materials for light hydrocarbon separation due to their designability of structure and easy modulation of function. This review provides an overview of recent advances in the design, synthesis, and application of MOFs for light hydrocarbon separation in recent years, with a focus on the separation of alkane, alkene, and alkyne. We discuss strategies for improving the adsorption selectivity and capacity of MOFs, including pore size limitation, physical adsorption, and chemisorption. In addition, we discuss the advantages/disadvantages, challenges, and prospects of MOFs in the separation of light hydrocarbon.

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“…To date, as a consequence of their high surface area and favorable mesoporous/microporous structures, various nanoporous solid-based sorbents such as metal–organic frameworks (MOFs), − zeolites, covalent–organic frameworks (COFs), , porous carbons, − and porous polymers − have been discovered and assessed in terms of both the carbon capture capacity and selectivity. Among those solid-based adsorbents, nanoporous carbons are undeniably favorable materials not only in CO 2 capture but also in water treatment, methane storage, and catalysis due to their outstanding textural properties, overall abundance, and low cost. − Although porous carbons possess advanced textural features such as a large specific Brunauer–Emmett–Teller (BET) surface area, a large pore volume, and tunable porosity, they, however, have limited performance in CO 2 adsorption capacity and selectivity efficiency owing to the lack of CO 2 -philic functionalities. , Thus, it is a necessity to decorate the porous carbons’ surface to enhance carbon capture and separation activity. It has been found that heteroatoms (N, S, P, and O) cooperating with porous carbon significantly improve the work role of the carbon lattice because the diverse electronegativity of heteroatoms and carbon as well as their self-lone pair electrons could regulate the charge and spin density of carbon atoms in the framework, which promotes the defect sites on the surface and leads to increasing adsorption of reactants. − This remarkably results in a great CO 2 capture capacity and induced gas selectivity throughout the adsorption process.…”

Section: Introductionmentioning

confidence: 99%

Polyacrylonitrile-Derived N-Doped Nanoporous Carbon Fibers for CO₂ Adsorption

Demir

et al. 2022

ACS Appl. Nano Mater.

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Carbon dioxide (CO2) capture and storage is a fundamental global environmental issue that has driven researchers to develop ingenious strategies to overcome this issue. Herein, N-enriched nanoporous carbon fibers were prepared from commercially available polyacrylonitrile fiber through a one-pot simultaneous carbonization/activation strategy. The effect of the amount of the activating agent and carbonization temperature on the nanoporous/surface chemical properties of carbons and the consequent CO2 adsorption performance was fully investigated. This direct activating strategy protected the fiber morphology of the resulting nanoporous carbons, while also resulting in a well-developed porous structure. The as-prepared nanoporous carbon fiber shows the maximum Brunauer–Emmett–Teller surface area and total pore volume of 2330 m2 g–1 and 1.25 cm3 g–1, respectively, together with a nitrogen content of up to 14.36 wt %. The optimal nanoporous carbon fiber exhibited CO2 uptakes of 6.16 and 4.03 mmol g–1 at 1 bar and 0 and 25 °C, respectively, with an acceptable CO2/N2 selectivity of 23. Besides, the optimal sample depicts a dynamic CO2 capture capacity of 0.84 mmol g–1 and only a 3% CO2 uptake capacity loss after five adsorption–desorption cycles. Overall, the combined effect of narrow microporosity and nitrogen functionalities determined the CO2 uptake of this series of N-doped nanoporous carbon fibers.

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Designed synthesis of porous carbons for the separation of light hydrocarbons

Cited by 13 publications

References 170 publications

Progress in the Separation and Purification of Carbon Hydrocarbon Compounds Using MOFs and Molecular Sieves

Progress in the Separation and Purification of Carbon Hydrocarbon Compounds Using MOFs and Molecular Sieves

Porous Metal–Organic Frameworks for Light Hydrocarbon Separation

Polyacrylonitrile-Derived N-Doped Nanoporous Carbon Fibers for CO₂ Adsorption

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Designed synthesis of porous carbons for the separation of light hydrocarbons

Cited by 13 publications

References 170 publications

Progress in the Separation and Purification of Carbon Hydrocarbon Compounds Using MOFs and Molecular Sieves

Progress in the Separation and Purification of Carbon Hydrocarbon Compounds Using MOFs and Molecular Sieves

Porous Metal–Organic Frameworks for Light Hydrocarbon Separation

Polyacrylonitrile-Derived N-Doped Nanoporous Carbon Fibers for CO2 Adsorption

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Product

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Polyacrylonitrile-Derived N-Doped Nanoporous Carbon Fibers for CO₂ Adsorption