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Chen L, Watanabe T, Kanoh H, Hata K, Ohba T. Cooperative CO2 adsorption promotes high CO2 adsorption density over wide optimal nanopore range. ADSORPT SCI TECHNOL 2017. [DOI: 10.1177/0263617417713573] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Separation of CO2 based on adsorption, absorption, and membrane techniques is a crucial technology necessary to address current global warming issues. Porous media are essential for all these approaches and understanding the nature of the porous structure is important for achieving highly efficient CO2 adsorption. Porous carbon is considered to be a suitable porous media for investigating the fundamental mechanisms of CO2 adsorption, because of its simple morphology and its availability in a wide range of well-defined pore sizes. In this study, we investigated the dependence of CO2 adsorption on pore structures such as pore size, volume, and specific surface area. We also studied slit-shaped and cylindrical pore morphologies based on activated carbon fibers of 0.6–1.7 nm and carbon nanotubes of 1–5 nm, respectively, with relatively uniform structures. Porous media with larger specific surface areas gave higher CO2 adsorption densities than those of media having larger pore volumes. Narrower pores gave higher adsorption densities because of deep adsorption potential wells. However, at a higher pressure CO2 adsorption densities increased again in nanopores including micropores and small mesopores. The optimal pore size ranges of CO2 adsorption in the slit-shaped and cylindrical carbon pores were 0.4–1.2 and 1.0–2.0 nm, respectively, although a high adsorption density was only expected for the narrow carbon nanopores from adsorption potentials. The wider nanopore ranges than expected nanopore ranges are reasonable when considering intermolecular interactions in addition to CO2–carbon pore interactions. Therefore, cooperative adsorption among CO2 in relatively narrow nanopores can allow for high density and high capacity adsorption.
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Affiliation(s)
| | | | | | - Kenji Hata
- National Institute of Advanced Industrial Science and Technology (AIST), Japan
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Bhatia SK. Characterizing Structural Complexity in Disordered Carbons: From the Slit Pore to Atomistic Models. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:831-847. [PMID: 27996264 DOI: 10.1021/acs.langmuir.6b03459] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The reliable characterization of nanoporous carbons is critical to the design and optimization of their numerous applications; however, the vast majority of carbons in industrial use are highly disordered, with complex structures whose understanding has long challenged researchers. The idealized slit pore model represents the most commonly used approximation to a carbon nanopore; nevertheless, it has been only partially successful in predicting adsorption isotherms and fails significantly in predicting transport properties because of its inability to capture structural disorder and its effect on fluid accessibility. Atomistic modeling of the structure has much potential for overcoming this limitation, and among such approaches, hybrid reverse Monte Carlo simulation has emerged as the most attractive. This method reconstructs the structure of a carbon based on the fitting of its experimentally measured pair distribution function and appropriate properties such as porosity while minimizing the energy. The method is shown to be best implemented using a multistage strategy, with the first stage used to attain a deep minimum of the energy and subsequent stages to refine the structure based on the fitting of specific properties. Methods to determine the accessibility of gases based on the atomistic structure are outlined, and it is shown that energy barriers are very sensitive to small differences in the sizes of constrictions and pore entries. The ability to accurately predict macroscopic transport coefficients of adsorbates in nanoporous carbons appears to be the greatest limitation of such models. Overcoming this will require the fitting of properties more sensitive to long-range disorder than the currently used pair distribution and the use of a suitable multiscaling strategy, which is suggested as a future direction for advancing atomistic models. The inclusion of heteroatoms in the structure is also an important area requiring further attention, particularly in the development of computationally efficient force fields incorporating their interactions.
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Affiliation(s)
- Suresh K Bhatia
- School of Chemical Engineering, The University of Queensland , St. Lucia, QLD 4072, Australia
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Gupta S, Yadav A, Singh S, Verma N. Synthesis of Silicon Carbide-Derived Carbon as an Electrode of a Microbial Fuel Cell and an Adsorbent of Aqueous Cr(VI). Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.6b03832] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Shally Gupta
- Department
of Chemical Engineering and ‡Center for Environmental Science
and Engineering, Indian Institute of Technology Kanpur, Kanpur, India 208016
| | - Ashish Yadav
- Department
of Chemical Engineering and ‡Center for Environmental Science
and Engineering, Indian Institute of Technology Kanpur, Kanpur, India 208016
| | - Shiv Singh
- Department
of Chemical Engineering and ‡Center for Environmental Science
and Engineering, Indian Institute of Technology Kanpur, Kanpur, India 208016
| | - Nishith Verma
- Department
of Chemical Engineering and ‡Center for Environmental Science
and Engineering, Indian Institute of Technology Kanpur, Kanpur, India 208016
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Chun YS, Lee ES, Jeong MG, Lim DS. Synthesis and characteristics of chloroform-treated silicon carbide-derived carbon layers. RSC Adv 2016. [DOI: 10.1039/c6ra22768f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The pores reduced for CDC layers synthesized using (d–f) bubbled chloroform compared to that of (a–c) chlorine gas.
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Affiliation(s)
- Y. S. Chun
- Department of Materials Science and Engineering
- Korea University
- Seoul 136-701
- Korea
| | - E. S. Lee
- Department of Materials Science and Engineering
- Korea University
- Seoul 136-701
- Korea
| | - M. G. Jeong
- Department of Materials Science and Engineering
- Korea University
- Seoul 136-701
- Korea
| | - D. S. Lim
- Department of Materials Science and Engineering
- Korea University
- Seoul 136-701
- Korea
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Farmahini AH, Sholl DS, Bhatia SK. Fluorinated Carbide-Derived Carbon: More Hydrophilic, Yet Apparently More Hydrophobic. J Am Chem Soc 2015; 137:5969-79. [DOI: 10.1021/jacs.5b01105] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Amir H. Farmahini
- School
of Chemical Engineering, The University of Queensland (UQ), Brisbane, Queensland 4072, Australia
| | - David S. Sholl
- School
of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Suresh K. Bhatia
- School
of Chemical Engineering, The University of Queensland (UQ), Brisbane, Queensland 4072, Australia
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Qin ZZ, Su TM, Ji HB, Jiang YX, Liu RW, Chen JH. Experimental and theoretical study of the intrinsic kinetics for dimethyl ether synthesis from CO2over Cu-Fe-Zr/HZSM-5. AIChE J 2015. [DOI: 10.1002/aic.14743] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Zu-zeng Qin
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering; Guangxi University; Nanning 530004 P.R. China
- School of Chemistry and Chemical Engineering; Sun Yat-sen University; Guangzhou 510275 P.R. China
| | - Tong-ming Su
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering; Guangxi University; Nanning 530004 P.R. China
- School of Chemistry and Chemical Engineering; Sun Yat-sen University; Guangzhou 510275 P.R. China
| | - Hong-bing Ji
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering; Guangxi University; Nanning 530004 P.R. China
- School of Chemistry and Chemical Engineering; Sun Yat-sen University; Guangzhou 510275 P.R. China
| | - Yue-xiu Jiang
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering; Guangxi University; Nanning 530004 P.R. China
| | - Rui-wen Liu
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering; Guangxi University; Nanning 530004 P.R. China
| | - Jian-hua Chen
- College of Resources and Metallurgy; Guangxi University; Nanning 530004 P.R. China
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Kong Y, Shen X, Cui S, Fan M. Use of monolithic silicon carbide aerogel as a reusable support for development of regenerable CO2adsorbent. RSC Adv 2014. [DOI: 10.1039/c4ra11261j] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Farmahini AH, Bhatia SK. Differences in the adsorption and diffusion behaviour of water and non-polar gases in nanoporous carbon: role of cooperative effects of pore confinement and hydrogen bonding. MOLECULAR SIMULATION 2014. [DOI: 10.1080/08927022.2014.976640] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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9
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Murugan L, Lakshmipathi S, Bhatia SK. Influence of in-plane Stone–Thrower–Wales defects and edge functionalisation on the adsorption of CO2and H2O on graphene. RSC Adv 2014. [DOI: 10.1039/c4ra06184e] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Farmahini AH, Shahtalebi A, Jobic H, Bhatia SK. Influence of Structural Heterogeneity on Diffusion of CH 4 and CO 2 in Silicon Carbide-Derived Nanoporous Carbon. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2014; 118:11784-11798. [PMID: 24932319 PMCID: PMC4051255 DOI: 10.1021/jp502929k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Revised: 05/07/2014] [Indexed: 06/03/2023]
Abstract
We investigate the influence of structural heterogeneity on the transport properties of simple gases in a Hybrid Reverse Monte Carlo (HRMC) constructed model of silicon carbide-derived carbon (SiC-DC). The energy landscape of the system is determined based on free energy analysis of the atomistic model. The overall energy barriers of the system for different gases are computed along with important properties, such as Henry constant and differential enthalpy of adsorption at infinite dilution, and indicate hydrophobicity of the SiC-DC structure and its affinity for CO2 and CH4 adsorption. We also study the effect of molecular geometry, pore structure and energy heterogeneity considering different hopping scenarios for diffusion of CO2 and CH4 through ultramicropores using the Nudged Elastic Band (NEB) method. It is shown that the energy barrier of a hopping molecule is very sensitive to the shape of the pore entry. We provide evidence for the influence of structural heterogeneity on self-diffusivity of methane and carbon dioxide using molecular dynamics simulation, based on a maximum in the variation of self-diffusivity with loading. A comparison of the MD simulation results with self-diffusivities from quasi-elastic neutron scattering (QENS) measurements and, with macroscopic uptake-based low-density transport coefficients, reveals the existence of internal barriers not captured in MD simulation and QENS experiments. Nevertheless, the simulation and macroscopic uptake-based diffusion coefficients agree within a factor of 2-3, indicating that our HRMC model structure captures most of the important energy barriers affecting the transport of CH4 in the nanostructure of SiC-DC.
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Affiliation(s)
- Amir H. Farmahini
- School
of Chemical Engineering, The University
of Queensland, QLD 4072, Australia
| | - Ali Shahtalebi
- School
of Chemical Engineering, The University
of Queensland, QLD 4072, Australia
| | - Hervé Jobic
- Institut
de Recherches sur la Catalyse et l’Environnement de Lyon, CNRS, Université Lyon 1, 2 Ave. Albert Einstein, 69626 Villeurbanne, France
| | - Suresh K. Bhatia
- School
of Chemical Engineering, The University
of Queensland, QLD 4072, Australia
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Haghpanah R, Rajendran A, Farooq S, Karimi IA. Optimization of One- and Two-Staged Kinetically Controlled CO2 Capture Processes from Postcombustion Flue Gas on a Carbon Molecular Sieve. Ind Eng Chem Res 2014. [DOI: 10.1021/ie403143z] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Reza Haghpanah
- School
of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459
| | - Arvind Rajendran
- School
of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459
| | - Shamsuzzaman Farooq
- Department
of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive, Singapore 117576
| | - Iftekhar A. Karimi
- Department
of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive, Singapore 117576
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