Carbon molecular sieve fiber with 3.4–4.9 Angstrom effective micropores for propylene/propane and other gas separations

Liu, Junqiang; Goss, Janet; Calverley, Ted; Liu, Yujun; Broomall, Chuck; Kang, Jun-Koo; Golombeski, Robert P.; Anaya, Denise; Moe, Briana; Mabe, Karla; Watson, Gary; Wetzel, Amy

doi:10.1016/j.micromeso.2020.110341

“…The adsorption separation process can be divided into separation and purification [9][10][11]. For the former, the separated gas components (i.e., the strongly adsorbed adsorbate) account for a large proportion of the mixture [12,13]. For the latter, impurities (usually less than 2%) are more strongly adsorbed to obtain high-purity gas.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Carbon-Based Adsorbents for Adsorptive Separation of Light Hydrocarbons

Wang

¹

,

Zhang

²

,

Ba

³

et al. 2022

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Light hydrocarbons (LHs) separation is an important process in petrochemical industry. The current separation technology predominantly relies on cryogenic distillation, which results in considerable energy consumption. Adsorptive separation using porous solids has received widespread attention due to its lower energy footprint and higher efficiency. Thus, tremendous efforts have been devoted to the design and synthesis of high-performance porous solids. Among them, porous carbons display exceptional stability, tunable pore structure, and surface chemistry and thus represent a class of novel adsorbents upon achieving the matched pore structures for LHs separations. In this review, the modulation strategies toward advanced carbon-based adsorbents for LHs separation are firstly reviewed. Then, the relationships between separation performances and key structural parameters of carbon adsorbents are discussed by exemplifying specific separation cases. The research findings on the control of the pore structures as well as the quantification of the adsorption sites are highlighted. Finally, the challenges of carbonaceous adsorbents facing for LHs separation are given, which would motivate us to rationally design more efficient absorbents and separation processes in future.

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Wiggling Mesopores Kinetically Amplify the Adsorptive Separation of Propylene/Propane

Yuan

¹

,

Wang

²

,

Zhang

³

et al. 2021

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Adsorptive separation is an appealing technology for propylene and propane separation; however, the challenge lies in the design of efficient adsorbents which can distinguish the two molecules having very similar properties. Here we report a kinetically amplified separation by creating wiggling mesopores in structurally robust carbon monoliths. The wiggling mesopores with alternating wide and narrow segments afford a surface area of 413 m2 g−1 and a tri‐modal pore size distribution centered at 1.5, 4.2 and 6.6 nm, respectively. The synergistically kinetic and equilibrium effects were observed and quantitatively assessed, which together ensured a remarkable propylene/propane selectivity up to 39. This selectivity outperformed not only the available carbon adsorbents but also highly competitive among the dominated crystalline porous adsorbents. In addition, the wiggling mesoporous carbon adsorbent showed excellent dynamical separation stability, which ensured its great potential in practical molecular separations.

show abstract

Wiggling Mesopores Kinetically Amplify the Adsorptive Separation of Propylene/Propane

Yuan

¹

,

Wang

²

,

Zhang

³

et al. 2021

View full text Add to dashboard Cite

Adsorptive separation is an appealing technology for propylene and propane separation; however, the challenge lies in the design of efficient adsorbents which can distinguish the two molecules having very similar properties. Here we report a kinetically amplified separation by creating wiggling mesopores in structurally robust carbon monoliths. The wiggling mesopores with alternating wide and narrow segments afford a surface area of 413 m2 g−1 and a tri‐modal pore size distribution centered at 1.5, 4.2 and 6.6 nm, respectively. The synergistically kinetic and equilibrium effects were observed and quantitatively assessed, which together ensured a remarkable propylene/propane selectivity up to 39. This selectivity outperformed not only the available carbon adsorbents but also highly competitive among the dominated crystalline porous adsorbents. In addition, the wiggling mesoporous carbon adsorbent showed excellent dynamical separation stability, which ensured its great potential in practical molecular separations.

show abstract

Carbon molecular sieve fiber with 3.4–4.9 Angstrom effective micropores for propylene/propane and other gas separations

Cited by 12 publications

References 49 publications

Recent Advances in Carbon-Based Adsorbents for Adsorptive Separation of Light Hydrocarbons

Recent Advances in Carbon-Based Adsorbents for Adsorptive Separation of Light Hydrocarbons

Wiggling Mesopores Kinetically Amplify the Adsorptive Separation of Propylene/Propane

Wiggling Mesopores Kinetically Amplify the Adsorptive Separation of Propylene/Propane

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