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Xia W, Yang Y, Sheng L, Zhou Z, Chen L, Zhang Z, Zhang Z, Yang Q, Ren Q, Bao Z. Temperature-dependent molecular sieving of fluorinated propane/propylene mixtures by a flexible-robust metal-organic framework. SCIENCE ADVANCES 2024; 10:eadj6473. [PMID: 38241379 PMCID: PMC10798556 DOI: 10.1126/sciadv.adj6473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2023] [Accepted: 12/20/2023] [Indexed: 01/21/2024]
Abstract
The electronics industry necessitates highly selective adsorption separation of hexafluoropropylene (C3F6) from perfluoropropane (C3F8), which poses a challenge due to their similar physiochemical properties. In this work, we present a microporous flexible-robust metal-organic framework (Ca-tcpb) with thermoregulatory gate opening, a rare phenomenon that allows tunable sieving of C3F8/C3F6. Remarkably, the temperature-dependent adsorption behavior enhances the discrimination between the larger C3F8 and the smaller C3F6, resulting in unprecedented C3F6/C3F8 selectivity (over 10,000) compared to other well-known porous materials at an optimal temperature (298 K). Dynamic breakthrough experiments demonstrate that high-purity C3F8 (over 99.999%) could be obtained from a C3F6/C3F8 (10:90) mixture under ambient conditions. The unique attributes of this material encompass exceptional adsorption selectivity, remarkable structural stability, and outstanding separation performance, positioning it as a highly promising candidate for C3F6/C3F8 separation. Single-crystal structural analysis of C3F6-loaded Ca-tcpb and theoretical calculations elucidate the host-guest interaction via multiple intermolecular interactions.
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Affiliation(s)
- Wei Xia
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, 310027 Hangzhou, P. R. China
- Institute of Zhejiang University-Quzhou, 324000 Quzhou, P. R. China
| | - Yisi Yang
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, 310027 Hangzhou, P. R. China
- Fujian Provincial Key Laboratory of Polymer Materials, College of Materials Science and Engineering, Fujian Normal University, 350007 Fuzhou, P. R. China
| | - Liangzheng Sheng
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, 310027 Hangzhou, P. R. China
- Institute of Zhejiang University-Quzhou, 324000 Quzhou, P. R. China
| | - Zhijie Zhou
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, 310027 Hangzhou, P. R. China
- Institute of Zhejiang University-Quzhou, 324000 Quzhou, P. R. China
| | - Lihang Chen
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, 310027 Hangzhou, P. R. China
- Institute of Zhejiang University-Quzhou, 324000 Quzhou, P. R. China
| | - Zhangjing Zhang
- Fujian Provincial Key Laboratory of Polymer Materials, College of Materials Science and Engineering, Fujian Normal University, 350007 Fuzhou, P. R. China
| | - Zhiguo Zhang
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, 310027 Hangzhou, P. R. China
- Institute of Zhejiang University-Quzhou, 324000 Quzhou, P. R. China
| | - Qiwei Yang
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, 310027 Hangzhou, P. R. China
- Institute of Zhejiang University-Quzhou, 324000 Quzhou, P. R. China
| | - Qilong Ren
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, 310027 Hangzhou, P. R. China
- Institute of Zhejiang University-Quzhou, 324000 Quzhou, P. R. China
| | - Zongbi Bao
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, 310027 Hangzhou, P. R. China
- Institute of Zhejiang University-Quzhou, 324000 Quzhou, P. R. China
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2
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Wang SM, Lan HL, Guan GW, Yang QY. Amino-Functionalized Microporous MOFs for Capturing Greenhouse Gases CF 4 and NF 3 with Record Selectivity. ACS APPLIED MATERIALS & INTERFACES 2022; 14:40072-40081. [PMID: 36001809 DOI: 10.1021/acsami.2c12164] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The capture and separation of fluorinated gases (F-gases) from N2 has the potential to not only reduce greenhouse gas emissions but also provide economic benefits for the semiconductor industry. In this work, two Ni-based metal-organic frameworks (MOFs), Ni-MOF (Ni(ina)2, ina = isonicotinic acid) and amine-functionalized NH2-Ni-MOF (Ni(3-ain)2, 3-ain = 3-aminoisonicotinic acid), were constructed for capturing F-gases (CF4 and NF3). At ambient conditions, both materials exhibit very high CF4 sorption capacities (2.92 mmol g-1 for Ni-MOF and 2.69 mmol g-1 for NH2-Ni-MOF). In addition, NH2-Ni-MOF exhibited a record selectivity of 46.3 for the CF4/N2 mixture at 298 K and 100 kPa, surpassing all benchmark adsorbents, including Ni-MOF (34.7). The kinetic adsorption tests demonstrated that Ni-MOF and NH2-Ni-MOF performed well for CF4/N2 and NF3/N2 mixtures. According to grand canonical Monte Carlo (GCMC) simulations, CF4 or NF3 interacts with NH2-Ni-MOF by multiple van der Waals interactions, resulting in stronger interaction than N2. More importantly, dynamic breakthrough experiments verified the practical separation potential of the two materials for CF4/N2 and NF3/N2 mixtures.
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Affiliation(s)
- Shao-Min Wang
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, China
| | - Hao-Ling Lan
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, China
| | - Guo-Wei Guan
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, China
| | - Qing-Yuan Yang
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, China
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3
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Wang SM, Mu XT, Liu HR, Zheng ST, Yang QY. Pore-Structure Control in Metal-Organic Frameworks (MOFs) for Capture of the Greenhouse Gas SF 6 with Record Separation. Angew Chem Int Ed Engl 2022; 61:e202207066. [PMID: 35674195 DOI: 10.1002/anie.202207066] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Indexed: 11/05/2022]
Abstract
In the electronics industry, the efficient recovery and capture of sulfur hexafluoride (SF6 ) from SF6 /N2 mixtures is of great importance. Herein, three metal-organic frameworks with fine-tuning pore structures, Cu(peba)2 , Ni(pba)2 , and Ni(ina)2 , were designed for SF6 capture. Among them, Ni(ina)2 has perfect pore sizes (6 Å) that are comparable to the kinetic diameter of sulfur hexafluoride (5.2 Å), affording the benchmark binding affinity for SF6 gas. Ni(ina)2 exhibits the highest SF6 /N2 selectivity (375.1 at 298 K and 1 bar) and ultra-high SF6 uptake capacity (53.5 cm3 g-1 at 298 K and 0.1 bar) at ambient conditions. The remarkable separation performance of Ni(ina)2 was verified by dynamic breakthrough experiments. Theoretical calculations and the SF6 -loaded single-crystal structure provided critical insight into the adsorption/separation mechanism. This porous coordination network has the potential to be used in industrial applications.
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Affiliation(s)
- Shao-Min Wang
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Xuan-Tong Mu
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Hao-Ran Liu
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Su-Tao Zheng
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, 710049, China
| | - Qing-Yuan Yang
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, 710049, China
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4
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Wang S, Wu Y, Zhang Y, Zhang Z, Zhang W, Li X, Ma W, Ma H. HF Resistant Porous Aromatic Frameworks for Electronic Special Gases Separation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:8667-8676. [PMID: 35776010 DOI: 10.1021/acs.langmuir.2c01098] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Here we report two HF acid resistant porous aromatic frameworks as adsorbents for high value-added electronic special gases (e.g., SF6, NF3, CF4, Xe, Kr) separation. The New-PAF-1 and N-SO3H exhibit exceptional adsorption selectivity for Xe and F-gases from semiconductor exhaust gas along with high physicochemical stability and excellent reusability, which have been collaboratively confirmed by single-component gas adsorption experiments, time-dependent adsorption rate tests, dynamic breakthrough experiments and regeneration tests. The theoretical calculations based on DFT and Mulliken atomic charge analyses elucidated the adsorption mechanism of New-PAF-1 and N-SO3H toward F-gases, Xe, Kr, and N2 at molecular level, including adsorption site, binding energy and electrostatic potentials distribution. The systematic investigation sufficiently manifests that PAFs can act as highly stable porous adsorbents in harsh operating conditions.
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Affiliation(s)
- Shanshan Wang
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi710049, China
| | - Yue Wu
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi710049, China
| | - Ying Zhang
- School of Chemistry, Xi'an Jiaotong University, Xi'an, Shaanxi710049, China
| | - Zhicheng Zhang
- School of Chemistry, Xi'an Jiaotong University, Xi'an, Shaanxi710049, China
| | - Wenxiang Zhang
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi710049, China
| | - Xiaoyu Li
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi710049, China
| | - Wuju Ma
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi710049, China
| | - Heping Ma
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi710049, China
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5
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Wang S, Mu X, Liu H, Zheng S, Yang Q. Pore‐Structure Control in Metal–Organic Frameworks (MOFs) for Capture of the Greenhouse Gas SF
6
with Record Separation. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202207066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Shao‐Min Wang
- School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an 710049 China
| | - Xuan‐Tong Mu
- School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an 710049 China
| | - Hao‐Ran Liu
- School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an 710049 China
| | - Su‐Tao Zheng
- School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an 710049 China
| | - Qing‐Yuan Yang
- School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an 710049 China
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6
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Separation of perfluorinated electron specialty gases on microporous carbon adsorbents with record selectivity. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121059] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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7
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8
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Peng X, Vicent-Luna JM, Jin Q. Separation of CF 4/N 2, C 2F 6/N 2, and SF 6/N 2 Mixtures in Amorphous Activated Carbons Using Molecular Simulations. ACS APPLIED MATERIALS & INTERFACES 2020; 12:20044-20055. [PMID: 32270994 DOI: 10.1021/acsami.0c01043] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The capture and separation of CF4, C2F6, and SF6 and their mixtures containing nitrogen is a challenging process. To solve this, we propose the use of saccharose coke-based carbons as membranes for the adsorption and separation of these gases. By means of advanced techniques of Monte Carlo and molecular dynamics simulations, we have studied the adsorption and diffusion of CF4, C2F6, and SF6 as well as their mixtures with nitrogen in three HRMC carbon models, namely, CS400, CS1000, and CS1000a. We have computed the adsorption isotherms of the single components and the heat of adsorption as a function of the adsorbed concentration. We have also calculated the competitive adsorption of fluoride molecules and nitrogen at two different molar fractions, 0.1 and 0.9. We have computed the transport properties of the adsorbed gases in terms of the self-diffusivities and corrected diffusivities. The performance of the membranes for the targeted separations has been characterized by the calculation of the permselectivity. Our results indicate that the activated amorphous carbon CS1000a is an efficient adsorbent for the capture of the fluoride adsorbates as well as their purification from nitrogen-based mixtures.
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Affiliation(s)
- Xuan Peng
- College of Information Science and Technology, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Jose Manuel Vicent-Luna
- Department of Physical, Chemical and Natural Systems, Universidad Pablo de Olavide, Ctra. Utrera Km 1, Seville ES-41013, Spain
- Center for Computational Energy Research, Department of Applied Physics, Eindhoven University of Technology, Eindhoven 5600 MB, The Netherlands
| | - Qibing Jin
- College of Information Science and Technology, Beijing University of Chemical Technology, Beijing 100029, PR China
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9
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Kim MB, Kim TH, Yoon TU, Kang JH, Kim JH, Bae YS. Efficient SF6/N2 separation at high pressures using a zirconium-based mesoporous metal–organic framework. J IND ENG CHEM 2020. [DOI: 10.1016/j.jiec.2019.12.032] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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10
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Håkansson P, Javed MA, Komulainen S, Chen L, Holden D, Hasell T, Cooper A, Lantto P, Telkki VV. NMR relaxation and modelling study of the dynamics of SF 6 and Xe in porous organic cages. Phys Chem Chem Phys 2019; 21:24373-24382. [PMID: 31663555 DOI: 10.1039/c9cp04379a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The porous solid formed from organic CC3 cage molecules has exceptional performance for rare gas separation. NMR spectroscopy provides a way to reveal the dynamical details by using experimental relaxation and diffusion measurements. Here, we investigated T1 and T2 relaxation as well as diffusion of 129Xe and SF6 gases in the CC3-R molecular crystal at various temperatures and magnetic field strengths. Advanced relaxation modelling made it possible to extract various important dynamical parameters for gases in CC3-R, such as exchange rates, activation energies and mobility rates of xenon, occupancies of the cavities, rotational correlational times, effective relaxation rates, and diffusion coefficients of SF6.
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Affiliation(s)
- Pär Håkansson
- NMR Research Unit, University of Oulu, P. O. Box 3000, 90014 Oulu, Finland.
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11
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Chuah CY, Yu S, Na K, Bae TH. Enhanced SF6 recovery by hierarchically structured MFI zeolite. J IND ENG CHEM 2018. [DOI: 10.1016/j.jiec.2017.12.045] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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12
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Saha D, Taylor B, Alexander N, Joyce DF, Faux GI, Lin Y, Shteyn V, Orkoulas G. One-step conversion of agro-wastes to nanoporous carbons: Role in separation of greenhouse gases. BIORESOURCE TECHNOLOGY 2018; 256:232-240. [PMID: 29453049 DOI: 10.1016/j.biortech.2018.02.026] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Revised: 02/03/2018] [Accepted: 02/05/2018] [Indexed: 06/08/2023]
Abstract
Highly microporous carbons have been synthesized from four types of agro-wastes of lignin, walnut shells, orange peels and apricot seeds by one-step carbonization/activation with potassium hydroxide (KOH) in varying ratios. The resultant carbons demonstrated BET specific surface areas of 727-2254 m2/g, and total pore volumes 0.34-1.14 cm3/g. These are higher than the majority of agro-waste derived carbons reported in the literature. For all the carbons, CO2 adsorption at 298 K was higher than SF6 followed by N2 suggesting a possible separation of CO2 and SF6 from N2. The adsorbed amounts of CO2 at 298 K and 273 K and at pressures up to 760 Torr were 7.24 and 9.4 mmol/g, respectively which, to the best of our knowledge, are the highest CO2 uptakes in these temperatures by any carbon material reported so far. For all the gases, selectivity, mixed adsorption isotherms and adsorption breakthrough have been simulated from experimental data.
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Affiliation(s)
- Dipendu Saha
- Department of Chemical Engineering, Widener University, One University Place, Chester, PA 19013, USA.
| | - Bryan Taylor
- Department of Chemical Engineering, Widener University, One University Place, Chester, PA 19013, USA
| | - Nicole Alexander
- Department of Chemical Engineering, Widener University, One University Place, Chester, PA 19013, USA
| | - Daniel F Joyce
- Department of Chemical Engineering, Widener University, One University Place, Chester, PA 19013, USA
| | - Gabriela I Faux
- Department of Chemical Engineering, Widener University, One University Place, Chester, PA 19013, USA
| | - Yiting Lin
- Department of Chemical Engineering, Widener University, One University Place, Chester, PA 19013, USA
| | - Vladimir Shteyn
- Department of Chemical Engineering, Widener University, One University Place, Chester, PA 19013, USA
| | - Gerassimos Orkoulas
- Department of Chemical Engineering, Widener University, One University Place, Chester, PA 19013, USA
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13
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Wöllner M, Leistner M, Wollmann P, Benusch M, Klein N, Grählert W, Kaskel S. Estimating pore size distributions of activated carbons via optical calorimetry. ADSORPTION 2017. [DOI: 10.1007/s10450-016-9852-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Hasell T, Miklitz M, Stephenson A, Little MA, Chong S, Clowes R, Chen L, Holden D, Tribello GA, Jelfs KE, Cooper AI. Porous Organic Cages for Sulfur Hexafluoride Separation. J Am Chem Soc 2016; 138:1653-9. [PMID: 26757885 PMCID: PMC5101576 DOI: 10.1021/jacs.5b11797] [Citation(s) in RCA: 132] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Indexed: 12/22/2022]
Abstract
A series of porous organic cages is examined for the selective adsorption of sulfur hexafluoride (SF6) over nitrogen. Despite lacking any metal sites, a porous cage, CC3, shows the highest SF6/N2 selectivity reported for any material at ambient temperature and pressure, which translates to real separations in a gas breakthrough column. The SF6 uptake of these materials is considerably higher than would be expected from the static pore structures. The location of SF6 within these materials is elucidated by X-ray crystallography, and it is shown that cooperative diffusion and structural rearrangements in these molecular crystals can rationalize their superior SF6/N2 selectivity.
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Affiliation(s)
- Tom Hasell
- Department
of Chemistry and Centre for Materials Discovery, University of Liverpool, Crown St., Liverpool L69
7ZD, United Kingdom
| | - Marcin Miklitz
- Department
of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, United Kingdom
| | - Andrew Stephenson
- Department
of Chemistry and Centre for Materials Discovery, University of Liverpool, Crown St., Liverpool L69
7ZD, United Kingdom
| | - Marc A. Little
- Department
of Chemistry and Centre for Materials Discovery, University of Liverpool, Crown St., Liverpool L69
7ZD, United Kingdom
| | - Samantha
Y. Chong
- Department
of Chemistry and Centre for Materials Discovery, University of Liverpool, Crown St., Liverpool L69
7ZD, United Kingdom
| | - Rob Clowes
- Department
of Chemistry and Centre for Materials Discovery, University of Liverpool, Crown St., Liverpool L69
7ZD, United Kingdom
| | - Linjiang Chen
- Department
of Chemistry and Centre for Materials Discovery, University of Liverpool, Crown St., Liverpool L69
7ZD, United Kingdom
| | - Daniel Holden
- Department
of Chemistry and Centre for Materials Discovery, University of Liverpool, Crown St., Liverpool L69
7ZD, United Kingdom
| | - Gareth A. Tribello
- Atomistic
Simulation Centre, Department of Physics and Astronomy, Queen’s University Belfast, University Road, Belfast BT7 1NN, United Kingdom
| | - Kim E. Jelfs
- Department
of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, United Kingdom
| | - Andrew I. Cooper
- Department
of Chemistry and Centre for Materials Discovery, University of Liverpool, Crown St., Liverpool L69
7ZD, United Kingdom
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15
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Wide Carbon Nanopores as Efficient Sites for the Separation of SF6 from N2. Sci Rep 2015; 5:11994. [PMID: 26149217 PMCID: PMC4493711 DOI: 10.1038/srep11994] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2014] [Accepted: 06/15/2015] [Indexed: 12/28/2022] Open
Abstract
SF6 and SF6-N2 mixed gases are used widely as insulators, but such gases have high greenhouse gas potential. The separation of SF6 from SF6-N2 mixed gases is an inevitable result of their use. Single-walled carbon nanohorns (CNHs) were used here for a fundamental study of the separation of SF6 and N2. The diameters of the interstitial and internal nanopores of the CNHs were 0.7 and 2.9 nm, respectively. The high selectivity of SF6 over N2 was observed only in the low-pressure regime in the interstitial 0.7 nm nanopores; the selectively was significantly decreased at higher pressures. In contrast, the high selectivity was maintained over the entire pressure range in the internal 2.9-nm nanopores. These results showed that the wide carbon nanopores were efficient for the separation of SF6 from the mixed gas.
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16
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Matito-Martos I, Álvarez-Ossorio J, Gutiérrez-Sevillano JJ, Doblaré M, Martin-Calvo A, Calero S. Zeolites for the selective adsorption of sulfur hexafluoride. Phys Chem Chem Phys 2015; 17:18121-30. [DOI: 10.1039/c5cp02407b] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Molecular simulations have been used to investigate at the molecular level the suitability of zeolites with different topology on the adsorption, diffusion and separation of a nitrogen–sulfur hexafluoride mixture containing the latter at low concentration.
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Affiliation(s)
- I. Matito-Martos
- Department of Physical
- Chemical and Natural Systems
- University Pablo de Olavide
- Sevilla 41013
- Spain
| | - J. Álvarez-Ossorio
- Department of Physical
- Chemical and Natural Systems
- University Pablo de Olavide
- Sevilla 41013
- Spain
| | | | - M. Doblaré
- Abengoa Research
- Abengoa
- Campus Palmas Altas
- 41014 Seville
- Spain
| | - A. Martin-Calvo
- Department of Physical
- Chemical and Natural Systems
- University Pablo de Olavide
- Sevilla 41013
- Spain
| | - S. Calero
- Department of Physical
- Chemical and Natural Systems
- University Pablo de Olavide
- Sevilla 41013
- Spain
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17
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Zaitan H, Korrir A, Chafik T, Bianchi D. Evaluation of the potential of volatile organic compound (di-methyl benzene) removal using adsorption on natural minerals compared to commercial oxides. JOURNAL OF HAZARDOUS MATERIALS 2013; 262:365-376. [PMID: 24061215 DOI: 10.1016/j.jhazmat.2013.08.071] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Revised: 08/26/2013] [Accepted: 08/27/2013] [Indexed: 05/28/2023]
Abstract
This study is dedicated to the investigation of the potential of volatile organic compounds (VOC) adsorption over low cost natural minerals (bentonite and diatomite). The performances of these solids, in terms of adsorption/desorption properties, were compared to commercial adsorbents, such as silica, alumina and titanium dioxide. The solids were first characterized by different physico-chemical methods and di-methyl benzene (dMB) was selected as model VOC pollutant for the investigation of adsorptive characteristics. The experiments were carried out with a fixed bed reactor under dynamic conditions using Fourier Transform InfraRed spectrometer to measure the evolution of dMB concentrations in the gaseous stream at the outlet of the reactor. The measured breakthrough curves yields to adsorbed amounts at saturation that has been used to obtain adsorption isotherms. The latters were used for determination of the heat involved in the adsorption process and estimation of its values using the isosteric method. Furthermore, the performances of the studied materials were compared considering the adsorption efficiency/cost ratio.
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Affiliation(s)
- Hicham Zaitan
- Laboratory LCMC, Faculty of Sciences and Techniques, University Sidi Mohamed BenAbdellah, B.P. 2202, Fez, Morocco.
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18
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Chiang YC, Wu PY. Adsorption equilibrium of sulfur hexafluoride on multi-walled carbon nanotubes. JOURNAL OF HAZARDOUS MATERIALS 2010; 178:729-738. [PMID: 20185236 DOI: 10.1016/j.jhazmat.2010.02.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2009] [Revised: 01/16/2010] [Accepted: 02/01/2010] [Indexed: 05/28/2023]
Abstract
The adsorption of sulfur hexafluoride (SF(6)) on multi-walled carbon nanotubes (MWNTs) was investigated. The properties of MWNTs were characterized and the adsorption capacities of SF(6) on MWNTs at different concentrations and temperatures were collected. H(2)SO(4)/H(2)O(2) oxidation or KOH activation of MWNTs has effectively introduced the surface oxides and modified the microstructure without destruction of their graphitic crystalline structure. The MWNTs, especially the modified samples, are expected to be promising adsorbents for SF(6) removals from air. The saturated capacities of SF(6) with a concentration of 518 ppmv on the MWNTs ranged from 278 to 497 mg/g at 25 degrees C. The Toth equation has been reported to fit the adsorption data better than the Freundlich or Langmuir equation. The pi-pi dispersion interaction followed by the multi-layer adsorption and the electron donor-acceptor interaction were proposed to be the major adsorption mechanisms, depending on the adsorption temperature. The isosteric heat of adsorption, ranging from 51 to 124 kJ/mol with a loading of 30-300 mg/g, decreased with increasing SF(6) loading, reflecting the energetic heterogeneity of the MWNTs. These results suggest that the adsorption of SF(6) on MWNTs could be associated with binding to defect sites.
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Affiliation(s)
- Yu-Chun Chiang
- Department of Mechanical Engineering and Yuan Ze Fuel Cell Center, Yuan Ze University, 135 Yuan-Tung Rd., Chung-Li, Taoyuan 32003, Taiwan.
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Wu Z, Yang Y, Tu B, Webley PA, Zhao D. Adsorption of xylene isomers on ordered hexagonal mesoporous FDU-15 polymer and carbon materials. ADSORPTION 2009. [DOI: 10.1007/s10450-009-9159-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Sircar S. Recent Developments in Macroscopic Measurement of Multicomponent Gas Adsorption Equilibria, Kinetics, and Heats. Ind Eng Chem Res 2007. [DOI: 10.1021/ie0601293] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Affiliation(s)
- Shivaji Sircar
- School of Chemical Engineering, Lehigh University, Bethlehem, Pennsylvania 18015
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