Facile synthesis of carbon-based nanoporous adsorbent exhibiting high ammonia uptake under low pressure range

Cho, Kanghee; Yoon, Hyung Chul; Beum, Hee Tae; Kim, Sun Hyung; Lee, Chan Hyun; Kim, Jong‐Nam

doi:10.1016/j.micromeso.2020.110460

Cited by 9 publications

(3 citation statements)

References 23 publications

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“…Regarding the separation of NH 3 , activated carbons (ACs), zeolites, and metal halides are traditionally used solid adsorbents. ACs are intrinsically inert for interaction with NH 3 , but the situation can be improved by surface modification with acidic groups and metal salts. , However, the NH 3 adsorption capacities of most modified ACs are still quite limited, because it is difficult to incorporate large amount of highly dispersed acidic and metal sites into ACs. Most recently, Zhang et al reported a kind of biobased ACs simultaneously modified with HPO 4 2– and Cu 2+ , which can adsorb 6.36 mmol/g of NH 3 at 25 °C and 100 kPa, and 1.96 mmol/g of NH 3 from NH 3 /O 2 /N 2 mixed gas at 25 °C and 200 ppm .…”

Section: Solid Adsorptionmentioning

confidence: 99%

A Mini-Review on NH₃ Separation Technologies: Recent Advances and Future Directions

Zhang

Zheng

et al. 2022

Energy Fuels

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NH3 has been recognized as a future carrier of energy considering its high content of H. It can be combusted directly, or decomposed on-site to release H2. For the application of NH3 as an energy carrier, the efficient separation of NH3 is an important task. So far, many technologies such as physical condensation, liquid absorption, solid adsorption, and membrane separation are available for the separation of NH3. Recently, the integration of physical condensation and solid adsorption was also proposed for the separation of NH3, to simultaneously utilize the advantages of both technologies. However, an up-to-date review providing an overall description of NH3 separation technologies is still absent. In this mini-review, we briefly summarized the recent advances in NH3 separation technologies, and mainly discussed the publications in the past five years. First, we sequentially introduced physical condensation, liquid absorption, solid adsorption, membrane separation, and integration technologies. Then, the future directions for the development of NH3 separation technologies were analyzed.

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Section: Solid Adsorptionmentioning

confidence: 99%

A Mini-Review on NH₃ Separation Technologies: Recent Advances and Future Directions

Zhang

Zheng

et al. 2022

Energy Fuels

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“…Liquid absorbents need to be circulated in absorption and desorption towers, thus the practical application of ILs and DESs is greatly limited. Alternatively, zeolites, , activated carbons, , porous organic polymers, − and metal–organic frameworks − with intrinsic nanoporosity were investigated as solid adsorbents for NH 3 separation. They have large surface areas for contacting with NH 3 and can be functionalized with Lewis/Brønsted acidic , and open metal sites. ,,, Solid adsorbents are fixed in towers for successive adsorption and desorption and do not have the viscous issue-like liquid absorbents.…”

Section: Introductionmentioning

confidence: 99%

Few-Layered Hexagonal Boron Nitrides as Highly Effective and Stable Solid Adsorbents for Ammonia Separation

Zhang

Cao

Ding

et al. 2023

Ind. Eng. Chem. Res.

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Solid adsorbents with high NH3 separation performance and good stability are particularly important for industrial applications. In our work, few-layered hexagonal boron nitrides (h-BNs) were synthesized and proposed as a kind of solid adsorbent by utilizing the abundant Lewis acidic B atoms on h-BNs. The synthesized h-BNs were investigated for NH3 separation both experimentally and theoretically. It is found that the NH3 isotherms of h-BNs slightly deviate from the ideal profiles, suggesting that the h-BNs enable moderate interactions with NH3. At the pressure of 0.1 and 1 bar, the h-BNs can adsorb as much as 2.33 and 8.67 mmol/g of NH3, respectively. The h-BNs also demonstrate highly selective adsorption of NH3 from other gases such as N2, H2, and CO2, regardless of calculated ideal selectivities or breakthrough adsorption of mixed gases. The NH3 adsorption of h-BNs can be completely reversed, and the h-BNs also exhibit high oxidative resistance, which is of vital importance for the long-term application in industry. Density functional theory calculations and molecular dynamics simulations were further conducted to rationalize the effective separation of NH3 by h-BNs and disclose the underlying mechanism at the molecular level.

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“…Many attempts have been implemented for the development of high-capacity, low-cost, reversible, and eco-friendly absorbents/adsorbents. These include metal hydrides, halides and borohydrides, porous materials with zeolites and carbon, activated aluminum, metal–organic frameworks, , porous organic polymers, supported metal halide sorbents ionic liquids (ILs), , deep eutectic solvents (DESs), , and so on . The concept of DESs as effective absorbents for gases of different natures arose at the end of the 2000s due to the unique combination of their properties.…”

Section: Introductionmentioning

confidence: 99%

Deep Eutectic Solvents Composed of Urea and New Salts of a Choline Family for Efficient Ammonia Absorption

et al. 2021

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Two new deep eutectic solvents (DESs) composed of urea (U) and salts of a choline family such as dimethyl-di(2hydroxyethyl)-ammonium chloride [Me 2 C OH 2 N]Cl and methyl-tri(2hydroxyethyl)-ammonium chloride [MeC OH3 N]Cl mixed in a 1:1 molar ratio were prepared. Their densities, viscosities, refractive indices, and properties related to the ammonia absorption were thoroughly investigated. We found that the obtained DESs show an absorption capacity of 2.078 and 2.632 mol NH3, respectively, at 313.2 K and 101.3 kPa, which is approximately two times higher than for the choline chloride/urea (2:3) DES at the same conditions. Also, the obtained Henry's law constants are of the same sequence; that is, they increase from [MeC OH3 N]Cl/U to [Me 2 C OH 2 N]Cl/U and finally to choline chloride/urea. The mentioned tendencies show good correlation with DES's molar volume and its free volume, and also with the number of the CH 2 CH 2 OH substituents in a quaternary ammonium salt cation. This suggests that the gas capture occurs via the interactions (most likely H-bonding) between an NH 3 molecule(s) and the hydroxyalkyl fragments. Indeed, the results of 1 H NMR and FTIR spectroscopy confirm strong coupling between ammonia and hydroxyls leading to a distortion of the inherent DES structure. This finding agrees well with the fact that an NH 3 dissolution process in the studied DESs is favored by an entropic contribution.

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Facile synthesis of carbon-based nanoporous adsorbent exhibiting high ammonia uptake under low pressure range

Cited by 9 publications

References 23 publications

A Mini-Review on NH₃ Separation Technologies: Recent Advances and Future Directions

A Mini-Review on NH₃ Separation Technologies: Recent Advances and Future Directions

Few-Layered Hexagonal Boron Nitrides as Highly Effective and Stable Solid Adsorbents for Ammonia Separation

Deep Eutectic Solvents Composed of Urea and New Salts of a Choline Family for Efficient Ammonia Absorption

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Facile synthesis of carbon-based nanoporous adsorbent exhibiting high ammonia uptake under low pressure range

Cited by 9 publications

References 23 publications

A Mini-Review on NH3 Separation Technologies: Recent Advances and Future Directions

A Mini-Review on NH3 Separation Technologies: Recent Advances and Future Directions

Few-Layered Hexagonal Boron Nitrides as Highly Effective and Stable Solid Adsorbents for Ammonia Separation

Deep Eutectic Solvents Composed of Urea and New Salts of a Choline Family for Efficient Ammonia Absorption

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A Mini-Review on NH₃ Separation Technologies: Recent Advances and Future Directions

A Mini-Review on NH₃ Separation Technologies: Recent Advances and Future Directions