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Liu RS, Wang M, Li WC, Zhang XJ, Wang CT, Hao GP, Lu AH. Balancing the Kinetic and Thermodynamic Synergetic Effect of Doped Carbon Molecular Sieves for Selective Separation of C 2H 4/C 2H 6. Small 2024:e2401965. [PMID: 38739099 DOI: 10.1002/smll.202401965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2024] [Revised: 04/24/2024] [Indexed: 05/14/2024]
Abstract
Selective separation of ethylene and ethane (C2H4/C2H6) is a formidable challenge due to their close molecular size and boiling point. Compared to industry-used cryogenic distillation, adsorption separation would offer a more energy-efficient solution when an efficient adsorbent is available. Herein, a class of C2H4/C2H6 separation adsorbents, doped carbon molecular sieves (d-CMSs) is reported which are prepared from the polymerization and subsequent carbonization of resorcinol, m-phenylenediamine, and formaldehyde in ethanol solution. The study demonstrated that the polymer precursor themselves can be a versatile platform for modifying the pore structure and surface functional groups of their derived d-CMSs. The high proportion of pores centered at 3.5 Å in d-CMSs contributes significantly to achieving a superior kinetic selectivity of 205 for C2H4/C2H6 separation. The generated pyrrolic-N and pyridinic-N functional sites in d-CMSs contribute to a remarkable elevation of Henry selectivity to 135 due to the enhancement of the surface polarity in d-CMSs. By balancing the synergistic effects of kinetics and thermodynamics, d-CMSs achieve efficient separation of C2H4/C2H6. Polymer-grade C2H4 of 99.71% purity can be achieved with 75% recovery using the devised d-CMSs as reflected in a two-bed vacuum swing adsorption simulation.
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Affiliation(s)
- Ru-Shuai Liu
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Liaoning Key Laboratory for Catalytic Conversion of Carbon Resources, and School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, P. R. China
| | - Miao Wang
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Liaoning Key Laboratory for Catalytic Conversion of Carbon Resources, and School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, P. R. China
| | - Wen-Cui Li
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Liaoning Key Laboratory for Catalytic Conversion of Carbon Resources, and School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, P. R. China
| | - Xue-Jie Zhang
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Liaoning Key Laboratory for Catalytic Conversion of Carbon Resources, and School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, P. R. China
| | - Cheng-Tong Wang
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Liaoning Key Laboratory for Catalytic Conversion of Carbon Resources, and School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, P. R. China
| | - Guang-Ping Hao
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Liaoning Key Laboratory for Catalytic Conversion of Carbon Resources, and School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, P. R. China
| | - An-Hui Lu
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Liaoning Key Laboratory for Catalytic Conversion of Carbon Resources, and School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, P. R. China
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Xiao Y, Chu Y, Li S, Chen F, Gao W, Xu J, Deng F. Host-Guest Interaction in Ethylene and Ethane Separation on Zeolitic Imidazolate Frameworks as Revealed by Solid-State NMR Spectroscopy. Chemistry 2021; 27:11303-11308. [PMID: 34109690 DOI: 10.1002/chem.202101779] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Indexed: 11/07/2022]
Abstract
The separation of ethane/ethylene mixture by using metal-organic frameworks (MOFs) as adsorbents is strongly associated with the pore size-sieving effect and the adsorbent-adsorbate interaction. Herein, solid-state NMR spectroscopy is utilized to explore the host-guest interaction and ethane/ethylene separation mechanism on zeolitic imidazolate frameworks (ZIFs). Preferential access to the ZIF-8 and ZIF-8-90 frameworks by ethane compared to ethylene is directly visualized from two-dimensional 1 H-1 H spin diffusion MAS NMR spectroscopy and further verified by computational density distributions. The 1 H MAS NMR spectroscopy provides an alternative for straightforwardly extracting the adsorption selectivity of ethane/ethylene mixture at 1.1∼9.6 bar in ZIFs, which is consistent with the IAST predictions.
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Affiliation(s)
- Yuqing Xiao
- State Key Laboratory of Magnetic Resonance, and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement, Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, P. R. China.,University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Yueying Chu
- State Key Laboratory of Magnetic Resonance, and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement, Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, P. R. China
| | - Shenhui Li
- State Key Laboratory of Magnetic Resonance, and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement, Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, P. R. China
| | - Fang Chen
- State Key Laboratory of Magnetic Resonance, and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement, Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, P. R. China
| | - Wei Gao
- State Key Laboratory of Magnetic Resonance, and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement, Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, P. R. China.,University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Jun Xu
- State Key Laboratory of Magnetic Resonance, and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement, Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, P. R. China
| | - Feng Deng
- State Key Laboratory of Magnetic Resonance, and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement, Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, P. R. China
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Lv D, Shi R, Chen Y, Wu Y, Wu H, Xi H, Xia Q, Li Z. Selective Adsorption of Ethane over Ethylene in PCN-245: Impacts of Interpenetrated Adsorbent. ACS Appl Mater Interfaces 2018; 10:8366-8373. [PMID: 29431991 DOI: 10.1021/acsami.7b19414] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The separation of ethane from ethylene using cryogenic distillation is an energy-intensive process in the industry. With lower energetic consumption, the adsorption technology provides the opportunities for developing the industry with economic sustainability. We report an iron-based metal-organic framework PCN-245 with interpenetrated structures as an ethane-selective adsorbent for ethylene/ethane separation. The material maintains stability up to 625 K, even after exposure to 80% humid atmosphere for 20 days. Adsorptive separation experiments on PCN-245 at 100 kPa and 298 K indicated that ethane and ethylene uptakes of PCN-245 were 3.27 and 2.39 mmol, respectively, and the selectivity of ethane over ethylene was up to 1.9. Metropolis Monte Carlo calculations suggested that the interpenetrated structure of PCN-245 created greater interaction affinity for ethane than ethylene through the crossing organic linkers, which is consistent with the experimental results. This work highlights the potential application of adsorbents with the interpenetrated structure for ethane separation from ethylene.
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Affiliation(s)
- Daofei Lv
- School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510641 , People's Republic of China
| | - Renfeng Shi
- School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510641 , People's Republic of China
| | - Yongwei Chen
- School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510641 , People's Republic of China
| | - Ying Wu
- School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510641 , People's Republic of China
| | - Houxiao Wu
- School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510641 , People's Republic of China
| | - Hongxia Xi
- School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510641 , People's Republic of China
| | - Qibin Xia
- School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510641 , People's Republic of China
| | - Zhong Li
- School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510641 , People's Republic of China
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