1
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Moon HJ, Carrillo JMY, Song M, Rim G, Heller WT, Leisen J, Proaño L, Short GN, Banerjee S, Sumpter BG, Jones CW. Underlying Roles of Polyol Additives in Promoting CO 2 Capture in PEI/Silica Adsorbents. CHEMSUSCHEM 2024:e202400967. [PMID: 38830830 DOI: 10.1002/cssc.202400967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2024] [Accepted: 06/03/2024] [Indexed: 06/05/2024]
Abstract
Solid-supported amines having low molecular weight branched poly(ethylenimine) (PEI) physically impregnated into porous solid supports are promising adsorbents for CO2 capture. Co-impregnating short-chain poly(ethylene glycol) (PEG) together with PEI alters the performance of the adsorbent, delivering improved amine efficiency (AE, mol CO2 sorbed/mol N) and faster CO2 uptake rates. To uncover the physical basis for this improved gas capture performance, we probe the distribution and mobility of the polymers in the pores via small angle neutron scattering (SANS), solid-state NMR, and molecular dynamic (MD) simulation studies. SANS and MD simulations reveal that PEG displaces wall-bound PEI, making amines more accessible for CO2 sorption. Solid-state NMR and MD simulation suggest intercalation of PEG into PEI domains, separating PEI domains and reducing amine-amine interactions, providing potential PEG-rich and amine-poor interfacial domains that bind CO2 weakly via physisorption while providing facile pathways for CO2 diffusion. Contrary to a prior literature hypothesis, no evidence is obtained for PEG facilitating PEI mobility in solid supports. Instead, the data suggest that PEG chains coordinate to PEI, forming larger bodies with reduced mobility compared to PEI alone. We also demonstrate promising CO2 uptake and desorption kinetics at varied temperatures, facilitated by favorable amine distribution.
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Affiliation(s)
- Hyun June Moon
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Jan-Michael Y Carrillo
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37380, USA
| | - MinGyu Song
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Guanhe Rim
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - William T Heller
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Johannes Leisen
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Laura Proaño
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Gabriel N Short
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Sayan Banerjee
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Bobby G Sumpter
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37380, USA
| | - Christopher W Jones
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, USA
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2
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Tran T, Singh S, Cheng S, Lin H. Scalable and Highly Porous Membrane Adsorbents for Direct Air Capture of CO 2. ACS APPLIED MATERIALS & INTERFACES 2024; 16:22715-22723. [PMID: 38626804 DOI: 10.1021/acsami.4c02873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2024]
Abstract
Direct air capture (DAC) of CO2 is a carbon-negative technology to mitigate carbon emissions, and it requires low-cost sorbents with high CO2 sorption capacity that can be easily manufactured on a large scale. In this work, we develop highly porous membrane adsorbents comprising branched polyethylenimine (PEI) impregnated in low-cost, porous Solupor supports. The effect of the PEI molecular mass and loading on the physical properties of the adsorbents is evaluated, including porosity, degradation temperature, glass transition temperature, and CO2 permeance. CO2 capture from simulated air containing 400 ppm of CO2 in these sorbents is thoroughly investigated as a function of temperature and relative humidity (RH). Polymer dynamics was examined using differential scanning calorimetry (DSC) and broadband dielectric spectroscopy (BDS), showing that CO2 sorption is limited by its diffusion in these PEI-based sorbents. A membrane adsorbent containing 48 mass% PEI (800 Da) with a porosity of 72% exhibits a CO2 sorption capacity of 1.2 mmol/g at 25 °C and RH of 30%, comparable to the state-of-the-art adsorbents. Multicycles of sorption and desorption were performed to determine their regenerability, stability, and potential for practical applications.
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Affiliation(s)
- Thien Tran
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
- U.S. Department of Energy, National Energy Technology Laboratory, Pittsburgh, Pennsylvania 15236, United States
- NETL Support Contractor, Pittsburgh, Pennsylvania 15236, United States
| | - Shweta Singh
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Shiwang Cheng
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, United States
| | - Haiqing Lin
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
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3
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Wang X, Song C. Developing High-Capacity Solid "Molecular Basket" Sorbents for Selective CO 2 Capture and Separation. Acc Chem Res 2023; 56:3358-3368. [PMID: 37984414 DOI: 10.1021/acs.accounts.3c00444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2023]
Abstract
ConspectusSince carbon-based energy continues to dominate (over 80%) the global primary energy supply, carbon dioxide capture, utilization, and sequestration (CCUS) is deemed to be a promising and viable option to mitigate greenhouse gas emissions and climate change, for which CO2 capture is critical to the overall success of CCUS. Although liquid amine scrubbing is a mature technology for carbon capture, it is energy-intensive and costly due to energy consumption in solvent heating and water evaporation apart from the energy needed to break amine-CO2 bonding. To address this challenge, Song's group developed a new design approach for adsorptive CO2 capture and separation, namely, "molecular basket" sorbents (MBS), without the need for dealing with solvent heating and water evaporation. The solid MBS consisting of polymeric amines (such as PEI) immobilized into nanoporous materials (such as SBA-15) possesses a high capacity for CO2 capture with high selectivity, fast kinetics, and good regenerability. Consequently, MBS can greatly reduce energy consumption and carbon capture cost. Conventional adsorbents such as zeolites, activated carbon, alumina, and silica have low adsorption capacities, and their use of CO2 adsorption requires prior removal of moisture and cooling of flue gas (∼35 °C). On the contrast, the CO2 sorption capacity of MBS can even be promoted by the presence of moisture/steam and reaches the best performance closer to flue gas temperature (∼75 °C). This Account presents an overview of our research progress in the material development and fundamental understanding of MBS for CO2 capture and the separation of CO2 from various gas streams. It begins with an illustration of the MBS concept, followed by efforts to improve the performance and pilot-scale demonstration of MBS for CO2 capture. With the systematic characterization of MBS by various ex situ and in situ techniques, a better understanding is developed for the CO2 sorption process mechanistically. Furthermore, this Account demonstrates how the fundamental understanding of the CO2 sorption mechanism promotes the further development of more robust and advanced sorbent materials with improved CO2 sorption capacity, kinetics of sorption and desorption, and cyclic stability. Finally, an outlook is provided for the future design and development of novel sorbent materials and the CO2 sorption process for various gas streams including flue gas, biogas, air, and hydrogen streams.
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Affiliation(s)
- Xiaoxing Wang
- EMS Energy Institute, Departments of Energy and Mineral Engineering and of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Chunshan Song
- EMS Energy Institute, Departments of Energy and Mineral Engineering and of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Department of Chemistry, Faculty of Science, The Chinese University of Hong Kong, Shatin, NT, Hong Kong 999077, China
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4
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Martinez AA, Arneodo Larochette PP, Gennari FC, Gasnier A. The Structure-Function Relationship of Branched Polyethylenimine Impregnated over Mesoporous Carbon Aerogels: An In-Depth Thermogravimetric Insight. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:17133-17145. [PMID: 37975861 DOI: 10.1021/acs.langmuir.3c02043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2023]
Abstract
We present a comprehensive thermogravimetric analysis (TGA) of polyethylenimine (PEI)-impregnated resorcinol-formaldehyde (RF) aerogels. While numerous studies focus on PEI-impregnated SBA, RF materials have been less examined, despite their interest and specificities. As most articles on PEI-impregnated porous materials follow typical experimental methods defined for SBA, particularities of RF-PEI materials could remain unheeded. The design of nonisothermal TGA protocols, completed with nitrogen isotherms, based on the systematic filling of the matrix delivers a fundamental understanding of the relationship between the structure and function. This study demonstrates (i) the competition between the matrix and PEI for CO2-physisorption (φ) and CO2-chemisorption (χ), (ii) the hysteresis ([Formula: see text]) of CO2 capture at low temperature attributed to the kinetic (K) hindrance of CO2 diffusion (D) through PEI film/plugs limiting the chemisorption, and (iii) the thermodynamic (θ) equilibrium limiting the capture at high temperature. At variance with SBA-PEI materials, the first layers of PEI in RF are readily available for CO2 capture given that this matrix does not covalently bind PEI as SBA. A facile method allows the discrimination between physi- and chemisorption, exhibiting how the former decreases with PEI coverage. The CO2 capture hysteresis, while seldom introduced or discussed, underlines that the commonly accepted operating temperature of the "maximum capture" is based on an incomplete experiment. Through isotherm adsorption analysis, we correlate the evolution of this maximum to the morphological distribution of PEI. This contribution highlights the specificities of RF-PEI and the advantages of our TGA protocol in understanding the structure/function relationship of this kind of material by avoiding the typical direct applications of SBA-specific protocols. The method is straightforward, does not need large-scale facilities, and is applicable to other materials. Its easiness and rapidness are suited to high-volume studies, befitting for the comprehensive evaluation of interacting factors such as the matrix's nature, pore size, and PEI weight.
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Affiliation(s)
- Alejandra A Martinez
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and Centro Atómico Bariloche (CNEA), S. C. de Bariloche, Río Negro R8402AGP, Argentina
- Instituto de Nanociencia y Nanotecnología, S. C. de Bariloche, Río Negro R8402AGP, Argentina
| | - Pierre P Arneodo Larochette
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and Centro Atómico Bariloche (CNEA), S. C. de Bariloche, Río Negro R8402AGP, Argentina
- Instituto Balseiro, Universidad Nacional de Cuyo, S. C. de Bariloche, Río Negro R8402AGP, Argentina
| | - Fabiana C Gennari
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and Centro Atómico Bariloche (CNEA), S. C. de Bariloche, Río Negro R8402AGP, Argentina
- Instituto Balseiro, Universidad Nacional de Cuyo, S. C. de Bariloche, Río Negro R8402AGP, Argentina
| | - Aurelien Gasnier
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and Centro Atómico Bariloche (CNEA), S. C. de Bariloche, Río Negro R8402AGP, Argentina
- Instituto de Nanociencia y Nanotecnología, S. C. de Bariloche, Río Negro R8402AGP, Argentina
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5
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Moon HJ, Carrillo JMY, Jones CW. Distribution and Mobility of Amines Confined in Porous Silica Supports Assessed via Neutron Scattering, NMR, and MD Simulations: Impacts on CO 2 Sorption Kinetics and Capacities. Acc Chem Res 2023; 56:2620-2630. [PMID: 37722889 PMCID: PMC10552550 DOI: 10.1021/acs.accounts.3c00363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Indexed: 09/20/2023]
Abstract
ConspectusSolid-supported amines are a promising class of CO2 sorbents capable of selectively capturing CO2 from diverse sources. The chemical interactions between the amine groups and CO2 give rise to the formation of strong CO2 adducts, such as alkylammonium carbamates, carbamic acids, and bicarbonates, which enable CO2 capture even at low driving force, such as with ultradilute CO2 streams. Among various solid-supported amine sorbents, oligomeric amines infused into oxide solid supports (noncovalently supported) are widely studied due to their ease of synthesis and low cost. This method allows for the construction of amine-rich sorbents while minimizing problems, such as leaching or evaporation, that occur with supported molecular amines.Researchers have pursued improved sorbents by tuning the physical and chemical properties of solid supports and amine phases. In terms of CO2 uptake, the amine efficiency, or the moles of sorbed CO2 per mole of amine sites, and uptake rate (CO2 capture per unit time) are the most critical factors determining the effectiveness of the material. While structure-property relationships have been developed for different porous oxide supports, the interaction(s) of the amine phase with the solid support, the structure and distribution of the organic phase within the pores, and the mobility of the amine phase within the pores are not well understood. These factors are important, because the kinetics of CO2 sorption, particularly when using the prototypical amine oligomer branched poly(ethylenimine) (PEI), follow an unconventional trend, with rapid initial uptake followed by a very slow, asymptotic approach to equilibrium. This suggests that the uptake of CO2 within such solid-supported amines is mass transfer-limited. Therefore, improving sorption performance can be facilitated by better understanding the amine structure and distribution within the pores.In this context, model solid-supported amine sorbents were constructed from a highly ordered, mesoporous silica SBA-15 support, and an array of techniques was used to probe the soft matter domains within these hybrid materials. The choice of SBA-15 as the model support was based on its ordered arrangement of mesopores with tunable physical and chemical properties, including pore size, particle lengths, and surface chemistries. Branched PEI─the most common amine phase used in solid CO2 sorbents─and its linear, low molecular weight analogue, tetraethylenepentamine (TEPA), were deployed as the amine phases. Neutron scattering (NS), including small angle neutron scattering (SANS) and quasielastic neutron scattering (QENS), alongside solid-state NMR (ssNMR) and molecular dynamics (MD) simulations, was used to elucidate the structure and mobility of the amine phases within the pores of the support. Together, these tools, which have previously not been applied to such materials, provided new information regarding how the amine phases filled the support pores as the loading increased and the mobility of those amine phases. Varying pore surface-amine interactions led to unique trends for amine distributions and mobility; for instance, hydrophilic walls (i.e., attractive to amines) resulted in hampered motions with more intimate coordination to the walls, while amines around hydrophobic walls or walls with grafted chains that interrupt amine-wall coordination showed recovered mobility, with amines being more liberated from the walls. By correlating the structural and dynamic properties with CO2 sorption properties, novel relationships were identified, shedding light on the performance of the amine sorbents, and providing valuable guidance for the design of more effective supported amine sorbents.
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Affiliation(s)
- Hyun June Moon
- School
of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Jan Michael Y. Carrillo
- Center
of Nanophase Materials Sciences, Oak Ridge
National Laboratory, Oak Ridge, Tennessee 37830, United States
| | - Christopher W. Jones
- School
of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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6
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Priyadarshini P, Rim G, Rosu C, Song M, Jones CW. Direct Air Capture of CO 2 Using Amine/Alumina Sorbents at Cold Temperature. ACS ENVIRONMENTAL AU 2023; 3:295-307. [PMID: 37743951 PMCID: PMC10515709 DOI: 10.1021/acsenvironau.3c00010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/25/2023] [Revised: 06/13/2023] [Accepted: 06/13/2023] [Indexed: 09/26/2023]
Abstract
Rising CO2 emissions are responsible for increasing global temperatures causing climate change. Significant efforts are underway to develop amine-based sorbents to directly capture CO2 from air (called direct air capture (DAC)) to combat the effects of climate change. However, the sorbents' performances have usually been evaluated at ambient temperatures (25 °C) or higher, most often under dry conditions. A significant portion of the natural environment where DAC plants can be deployed experiences temperatures below 25 °C, and ambient air always contains some humidity. In this study, we assess the CO2 adsorption behavior of amine (poly(ethyleneimine) (PEI) and tetraethylenepentamine (TEPA)) impregnated into porous alumina at ambient (25 °C) and cold temperatures (-20 °C) under dry and humid conditions. CO2 adsorption capacities at 25 °C and 400 ppm CO2 are highest for 40 wt% TEPA-incorporated γ-Al2O3 samples (1.8 mmol CO2/g sorbent), while 40 wt % PEI-impregnated γ-Al2O3 samples exhibit moderate uptakes (0.9 mmol g-1). CO2 capacities for both PEI- and TEPA-incorporated γ-Al2O3 samples decrease with decreasing amine content and temperatures. The 40 and 20 wt % TEPA sorbents show the best performance at -20 °C under dry conditions (1.6 and 1.1 mmol g-1, respectively). Both the TEPA samples also exhibit stable and high working capacities (0.9 and 1.2 mmol g-1) across 10 cycles of adsorption-desorption (adsorption at -20 °C and desorption conducted at 60 °C). Introducing moisture (70% RH at -20 and 25 °C) improves the CO2 capacity of the amine-impregnated sorbents at both temperatures. The 40 wt% PEI, 40 wt % TEPA, and 20 wt% TEPA samples show good CO2 uptakes at both temperatures. The results presented here indicate that γ-Al2O3 impregnated with PEI and TEPA are potential materials for DAC at ambient and cold conditions, with further opportunities to optimize these materials for the scalable deployment of DAC plants at different environmental conditions.
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Affiliation(s)
- Pranjali Priyadarshini
- School of Chemical &
Biomolecular Engineering, Georgia Institute
of Technology, 311 Ferst Drive, Atlanta, Georgia 30332-0100, United States
| | - Guanhe Rim
- School of Chemical &
Biomolecular Engineering, Georgia Institute
of Technology, 311 Ferst Drive, Atlanta, Georgia 30332-0100, United States
| | - Cornelia Rosu
- School of Chemical &
Biomolecular Engineering, Georgia Institute
of Technology, 311 Ferst Drive, Atlanta, Georgia 30332-0100, United States
| | - MinGyu Song
- School of Chemical &
Biomolecular Engineering, Georgia Institute
of Technology, 311 Ferst Drive, Atlanta, Georgia 30332-0100, United States
| | - Christopher W. Jones
- School of Chemical &
Biomolecular Engineering, Georgia Institute
of Technology, 311 Ferst Drive, Atlanta, Georgia 30332-0100, United States
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7
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Moon HJ, Carrillo JM, Leisen J, Sumpter BG, Osti NC, Tyagi M, Jones CW. Understanding the Impacts of Support-Polymer Interactions on the Dynamics of Poly(ethyleneimine) Confined in Mesoporous SBA-15. J Am Chem Soc 2022; 144:11664-11675. [PMID: 35729771 DOI: 10.1021/jacs.2c03028] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Supported amines are a promising class of CO2 sorbents offering large uptake capacities and fast uptake rates. Among supported amines, poly(ethyleneimine) (PEI) physically impregnated in the mesopores of SBA-15 silica is widely used. Within these composite materials, the chain dynamics and morphologies of PEI strongly influence the CO2 capture performance, yet little is known about chain and macromolecule mobility in confined pores. Here, we probe the impact of the support-PEI interactions on the dynamics and structures of PEI at the support interface and the corresponding impact on CO2 uptake performance, which yields critical structure-property relationships. The pore walls of the support are grafted with organosilanes with different chemical end groups to differentiate interaction modes (spanning from strong attraction to repulsion) between the pore surface and PEI. Combinations of techniques, such as quasi-elastic neutron scattering (QENS), 1H T1-T2 relaxation correlation solid-state NMR, and molecular dynamics (MD) simulations, are used to comprehensively assess the physical properties of confined PEI. We hypothesized that PEI would have faster dynamics when subjected to less attractive or repulsive interactions. However, we discover that complex interfacial interactions resulted in complex structure-property relationships. Indeed, both the chain conformation of the surface-grafted chains and of the PEI around the surface influenced the chain mobility and CO2 uptake performance. By coupling knowledge of the dynamics and distributions of PEI with CO2 sorption performance and other characteristics, we determine that the macroscopic structures of the hybrid materials dictate the first rapid CO2 uptake, and the rate of CO2 sorption during the subsequent gradual uptake stage is determined by PEI chain motions that promote diffusive jumps of CO2 through PEI-packed domains.
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Affiliation(s)
- Hyun June Moon
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Jan-Michael Carrillo
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States
| | - Johannes Leisen
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Bobby G Sumpter
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States
| | - Naresh C Osti
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, Gaithersburg, Maryland 20899, United States.,Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Christopher W Jones
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.,School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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8
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Kollias L, Zhang D, Allec SI, Nguyen MT, Lee MS, Cantu DC, Rousseau R, Glezakou VA. Advanced Theory and Simulation to Guide the Development of CO 2 Capture Solvents. ACS OMEGA 2022; 7:12453-12466. [PMID: 35465123 PMCID: PMC9022203 DOI: 10.1021/acsomega.1c07398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Accepted: 03/03/2022] [Indexed: 06/14/2023]
Abstract
Increasing atmospheric concentrations of greenhouse gases due to industrial activity have led to concerning levels of global warming. Reducing carbon dioxide (CO2) emissions, one of the main contributors to the greenhouse effect, is key to mitigating further warming and its negative effects on the planet. CO2 capture solvent systems are currently the only available technology deployable at scales commensurate with industrial processes. Nonetheless, designing these solvents for a given application is a daunting task requiring the optimization of both thermodynamic and transport properties. Here, we discuss the use of atomic scale modeling for computing reaction energetics and transport properties of these chemically complex solvents. Theoretical studies have shown that in many cases, one is dealing with a rich ensemble of chemical species in a coupled equilibrium that is often difficult to characterize and quantify by experiment alone. As a result, solvent design is a balancing act between multiple parameters which have optimal zones of effectiveness depending on the operating conditions of the application. Simulation of reaction mechanisms has shown that CO2 binding and proton transfer reactions create chemical equilibrium between multiple species and that the agglomeration of resulting ions and zwitterions can have profound effects on bulk solvent properties such as viscosity. This is balanced against the solvent systems needing to perform different functions (e.g., CO2 uptake and release) depending on the thermodynamic conditions (e.g., temperature and pressure swings). The latter constraint imposes a "Goldilocks" range of effective parameters, such as binding enthalpy and pK a, which need to be tuned at the molecular level. The resulting picture is that solvent development requires an integrated approach where theory and simulation can provide the necessary ingredients to balance competing factors.
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Affiliation(s)
- Loukas Kollias
- Basic
& Applied Molecular Foundations, Physical and Computational Sciences
Directorate, Pacific Northwest National
Laboratory, Richland, Washington 99352, United States
| | - Difan Zhang
- Basic
& Applied Molecular Foundations, Physical and Computational Sciences
Directorate, Pacific Northwest National
Laboratory, Richland, Washington 99352, United States
| | - Sarah I. Allec
- Basic
& Applied Molecular Foundations, Physical and Computational Sciences
Directorate, Pacific Northwest National
Laboratory, Richland, Washington 99352, United States
| | - Manh-Thuong Nguyen
- Basic
& Applied Molecular Foundations, Physical and Computational Sciences
Directorate, Pacific Northwest National
Laboratory, Richland, Washington 99352, United States
| | - Mal-Soon Lee
- Basic
& Applied Molecular Foundations, Physical and Computational Sciences
Directorate, Pacific Northwest National
Laboratory, Richland, Washington 99352, United States
| | - David C. Cantu
- Department
of Chemical and Materials Engineering, University
of Nevada, Reno, Reno, Nevada 89557, United States
| | - Roger Rousseau
- Basic
& Applied Molecular Foundations, Physical and Computational Sciences
Directorate, Pacific Northwest National
Laboratory, Richland, Washington 99352, United States
| | - Vassiliki-Alexandra Glezakou
- Basic
& Applied Molecular Foundations, Physical and Computational Sciences
Directorate, Pacific Northwest National
Laboratory, Richland, Washington 99352, United States
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9
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Zhang Q, Jiang Y, Li Y, Song X, Luo X, Ke Z, Zou Y. Design, synthesis, and physicochemical study of a biomass-derived CO 2 sorbent 2,5-furan-bis(iminoguanidine). iScience 2021; 24:102263. [PMID: 33796847 PMCID: PMC7995611 DOI: 10.1016/j.isci.2021.102263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 02/05/2021] [Accepted: 02/26/2021] [Indexed: 11/29/2022] Open
Abstract
In this study, the concept of biomass-based direct air capture is proposed, and the aminoguanidine CO2 chemical sorbent 2,5-furan-bis(iminoguanidine) (FuBIG) was designed, synthesized, and elucidated for the physicochemical properties in the process of CO2 capture and release. Results showed that the aqueous solution of FuBIG could readily capture CO2 from ambient air and provided an insoluble tetrahydrated carbonate salt FuBIGH2(CO3) (H2O)4 with a second order kinetics. Hydrogen binding modes of iminoguanidine cations with carbonate ions and water were identified by single-crystal X-ray diffraction analysis. Equilibrium constant (K) and the enthalpies (ΔH) for CO2 absorption/release were obtained by thermodynamic and kinetic analysis (K7 = 5.97 × 104, ΔH7 = -116.1 kJ/mol, ΔH8 = 209.31 kJ/mol), and the CO2-release process was conformed to the geometrical phase-boundary model (1-(1-α)1/3 = kt). It was found that the FuBIGH2(CO3) (H2O)4 can release CO2 spontaneously in DMSO without heating. Zebrafish models revealed a favorable biocompatibility of FuBIG.
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Affiliation(s)
- Qianzhong Zhang
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510000, P. R. China
| | - Yi Jiang
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510000, P. R. China
| | - Yinwu Li
- School of Chemistry, Sun Yat-sen University, Guangzhou 510000, P. R. China
| | - Xianheng Song
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510000, P. R. China
| | - Xiang Luo
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510000, P. R. China
| | - Zhuofeng Ke
- School of Chemistry, Sun Yat-sen University, Guangzhou 510000, P. R. China
| | - Yong Zou
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510000, P. R. China
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery, Guangzhou 510000, P. R. China
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10
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Rother G, Tumuluri U, Huang K, Heller WT, Dai S, Carrillo JM, Sumpter BG. Interactions of an Imine Polymer with Nanoporous Silica and Carbon in Hybrid Adsorbents for Carbon Capture. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:4622-4631. [PMID: 33819051 DOI: 10.1021/acs.langmuir.1c00305] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Efficient carbon capture from stationary point sources can be achieved using hybrid adsorbents comprising nanoporous substrates coated with imine polymers. The physical properties of the CO2-adsorbing, nanodispersed polymers are altered by their interactions with the substrate, which in turn may impact their capture capacity. We study silica and carbon nanoporous substrates with different pore morphologies that were impregnated with polymer imine with the goal of characterizing the polymer dispersions in the pores. For silica and carbon samples, the mean densities of confined poly(ethylene imine) (PEI) were measured as functions of polymer loading and temperature using small-angle neutron scattering. Strong densification is found for imine polymers imbibed in mesoporous carbon. PEI in nanoporous silica does not experience this strong densification. At high loadings, plugs form, preferably at the pore throats, and can reduce accessible porosity. CO2 capture measurements show that PEI interactions with the substrate play an important role. PEI in carbon shows the highest capture capacity at low temperatures and the lowest CO2 adsorption at high temperatures, making it well-suited for temperature swing adsorption applications.
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Affiliation(s)
- Gernot Rother
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Uma Tumuluri
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Kuan Huang
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - William T Heller
- Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Sheng Dai
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Jan-Michael Carrillo
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Bobby G Sumpter
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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11
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Singh B, Na J, Konarova M, Wakihara T, Yamauchi Y, Salomon C, Gawande MB. Functional Mesoporous Silica Nanomaterials for Catalysis and Environmental Applications. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2020. [DOI: 10.1246/bcsj.20200136] [Citation(s) in RCA: 71] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Baljeet Singh
- CICECO-Aveiro Institute of Materials, University of Aveiro, Department of Chemistry, Aveiro 3810-193, Portugal
| | - Jongbeom Na
- Australian Institute for Bioengineering and Nanotechnology (AIBN) and School of Chemical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia
- JST-ERATO Yamauchi Materials Space-Tectonics Project and International Center for Materials Nanoarchitechtonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Muxina Konarova
- Australian Institute for Bioengineering and Nanotechnology (AIBN) and School of Chemical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Toru Wakihara
- Graduate School of Engineering, The University of Tokyo, 7 Chome-3-1 Hongo, Bunkyo, Tokyo 113-8654, Japan
| | - Yusuke Yamauchi
- Australian Institute for Bioengineering and Nanotechnology (AIBN) and School of Chemical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia
- JST-ERATO Yamauchi Materials Space-Tectonics Project and International Center for Materials Nanoarchitechtonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- JST-ERATO Yamauchi Materials Space-Tectonics Project, Kagami Memorial Research Institute for Science and Technology, Waseda University, 2-8-26 Nishi-Waseda, Shinjuku, Tokyo 169-0051, Japan
| | - Carlos Salomon
- Exosome Biology Laboratory, Centre for Clinical Diagnostics, University of Queensland Centre for Clinical Research, Royal Brisbane and Women's Hospital, The University of Queensland, Brisbane, Queensland, Australia
- Department of Clinical Biochemistry and Immunology, Faculty of Pharmacy, University of Concepción, Concepción, Chile
| | - Manoj B. Gawande
- Regional Centre of Advanced Technologies and Materials, Palacky University, Šlechtitelů 27, Olomouc 783 71, Czech Republic
- Institute of Chemical Technology Mumbai-Marathwada Campus, Jalna, 431203 Maharashtra, India
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12
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Wilfong WC, Kail BW, Howard BH, Wang Q, Shi F, Ji T, Gray ML. Steam-Stable Basic Immobilized Amine Sorbent Pellets for CO 2 Capture Under Practical Conditions. ACS APPLIED MATERIALS & INTERFACES 2019; 11:38336-38346. [PMID: 31545021 DOI: 10.1021/acsami.9b13771] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Pelletization of basic immobilized amine sorbent (BIAS) particles is required to improve their mechanical strength and facilitate their practical CO2 capture application under fixed or dynamic reactor conditions. Herein, we utilized two methods to prepare amine-functionalized BIAS pellets. Method (ii-a) involved combining latex polychloroprene (PC)/polyamine solutions with fly ash (FA)/BIAS powder to form sorbent pellets. Alternatively, method (ii-b) entailed shaping and drying wet pastes of binder solution plus FA/SiO2 powder into pellet supports. These supports were then functionalized with leach-resistant polyethylenimine MW = 800 (PEI800)/N-N-diglycidyl-4-glycidyloxyaniline (tri-epoxide cross-linker, E3) or ethylenamine E100/E3 mixtures. All pellets were screened for CO2 capture by thermogravimetric analysis (dry 14% CO2/N2, 55-75 °C), H2O stability by accelerated water washing, and mechanical strength by crush and ball-mill attrition testing. The mechanism of superior method (ii-b) pellet formation was uncovered by N2 physisorption measurements, diffuse reflectance infrared Fourier transform spectroscopy, and scanning electron microscopy. Extended fixed bed testing of optimum E3/PEI800-0.13/1 pellets under practical conditions revealed complete CO2 capture stability of 1.5 mmol CO2/g after 48 h of continuous steam exposure (7.2% H2O/He, 105 °C) and minimal 14.6% loss in capacity after 75 hours of combined CO2 capture cycling and steam treating (48 h). This slight oxidative degradation could be alleviated by incorporating a K2CO3 antioxidant into the pellet formulation. Overall, the robust physiochemical properties of the polyamine/cross-linker method (ii-b) pellets confirm their suitability for pilot-scale testing.
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Affiliation(s)
- Walter Christopher Wilfong
- National Energy Technology Laboratory , 626 Cochrans Mill Road, P.O. Box 10940 , Pittsburgh , Pennsylvania 15236-0940 , USA
- Leidos Research Support Team , 626 Cochrans Mill Road, P.O. Box 10940 , Pittsburgh , Pennsylvania 15236-0940 , USA
| | - Brian W Kail
- National Energy Technology Laboratory , 626 Cochrans Mill Road, P.O. Box 10940 , Pittsburgh , Pennsylvania 15236-0940 , USA
- Leidos Research Support Team , 626 Cochrans Mill Road, P.O. Box 10940 , Pittsburgh , Pennsylvania 15236-0940 , USA
| | - Bret H Howard
- National Energy Technology Laboratory , 626 Cochrans Mill Road, P.O. Box 10940 , Pittsburgh , Pennsylvania 15236-0940 , USA
| | - Qiuming Wang
- National Energy Technology Laboratory , 626 Cochrans Mill Road, P.O. Box 10940 , Pittsburgh , Pennsylvania 15236-0940 , USA
- Oak Ridge National Institute for Science and Education (ORISE) , Oak Ridge , Tennessee 37830 , USA
| | - Fan Shi
- National Energy Technology Laboratory , 626 Cochrans Mill Road, P.O. Box 10940 , Pittsburgh , Pennsylvania 15236-0940 , USA
- Leidos Research Support Team , 626 Cochrans Mill Road, P.O. Box 10940 , Pittsburgh , Pennsylvania 15236-0940 , USA
| | - Tuo Ji
- National Energy Technology Laboratory , 626 Cochrans Mill Road, P.O. Box 10940 , Pittsburgh , Pennsylvania 15236-0940 , USA
- Oak Ridge National Institute for Science and Education (ORISE) , Oak Ridge , Tennessee 37830 , USA
| | - McMahan L Gray
- National Energy Technology Laboratory , 626 Cochrans Mill Road, P.O. Box 10940 , Pittsburgh , Pennsylvania 15236-0940 , USA
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13
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Zhang R, Wang X, Liu S, He L, Song C, Jiang X, Blach TP. Discovering Inherent Characteristics of Polyethylenimine-Functionalized Porous Materials for CO 2 Capture. ACS APPLIED MATERIALS & INTERFACES 2019; 11:36515-36524. [PMID: 31498590 DOI: 10.1021/acsami.9b08496] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
CO2 capture is vital for addressing greenhouse gas (GHG)-based environmental issues worldwide. Amine-polymer/silica sorbents have been extensively studied for CO2 capture, but the fundamental understandings of polyethylenimine (PEI) loading effect, thermal effect, and CO2 sorption behavior are still lacking. Small-angle neutron scattering (SANS) offers promising opportunities for characterizing CO2 sorption behavior of PEI-functionalized SBA-15. Herein, in situ SANS has been used to investigate not only PEI loading distribution but also PEI thermal swelling and temperature-dependent CO2 sorption behavior of PEI-functionalized SBA-15. The results indicate that PEI could disperse on the mesopore surface for the sample with low PEI loading, while for the sample with high PEI loading, PEI could not only disperse on the mesopore surface but also partially fill in the mesopore as plugs. The sample with high PEI loading shows a two-stage swelling of PEI with increasing temperature from 25 to 120 °C in vacuum, in which the size of the intramolecular voids between PEI chains has no change from 25 to 75 °C but expands from 75 to 120 °C, whereas only a subtle swelling is observed up to 120 °C for the sample with low PEI loading. Besides the fact that in situ SANS successfully detects physisorbed CO2 on the mesopore surface and chemisorbed CO2 by the amine groups simultaneously: (1) the amount of physisorbed CO2 increases with increasing pressure but decreases with increasing temperature, and (2) the amount of chemisorbed CO2 has a trend of VCO2 (75 °C) > VCO2 (120 °C) > VCO2 (25 °C). The thermal swelling of PEI causes dilation of intramolecular voids and thus increases the accessibility of chemisorption sites, resulting in higher CO2 sorption capacity. Therefore, temperature and PEI swelling are essential factors for kinetic and thermodynamic controls of CO2 capture in amine-functionalized porous adsorbents.
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Affiliation(s)
- Rui Zhang
- Department of Energy and Mineral Engineering, G3 Center and Energy Institute , Pennsylvania State University , University Park , Pennsylvania 16802 , United States
- EMS Energy Institute, PSU-DUT Joint Center for Energy Research and Department of Energy & Mineral Engineering , Pennsylvania State University , University Park , Pennsylvania 16802 , United States
- Neutron Scattering Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Xiaoxing Wang
- EMS Energy Institute, PSU-DUT Joint Center for Energy Research and Department of Energy & Mineral Engineering , Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - Shimin Liu
- Department of Energy and Mineral Engineering, G3 Center and Energy Institute , Pennsylvania State University , University Park , Pennsylvania 16802 , United States
- EMS Energy Institute, PSU-DUT Joint Center for Energy Research and Department of Energy & Mineral Engineering , Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - Lilin He
- Neutron Scattering Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Chunshan Song
- EMS Energy Institute, PSU-DUT Joint Center for Energy Research and Department of Energy & Mineral Engineering , Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - Xiao Jiang
- EMS Energy Institute, PSU-DUT Joint Center for Energy Research and Department of Energy & Mineral Engineering , Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - Tomasz P Blach
- School of Minerals and Energy Resources Engineering , University of New South Wales , Sydney , NSW 2052 , Australia
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Affiliation(s)
- Jason J. Lee
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30332, United States
| | - Carsten Sievers
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30332, United States
| | - Christopher W. Jones
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30332, United States
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15
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Jahandar Lashaki M, Khiavi S, Sayari A. Stability of amine-functionalized CO 2 adsorbents: a multifaceted puzzle. Chem Soc Rev 2019; 48:3320-3405. [PMID: 31149678 DOI: 10.1039/c8cs00877a] [Citation(s) in RCA: 105] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
This review focuses on important stability issues facing amine-functionalized CO2 adsorbents, including amine-grafted and amine-impregnated silicas, zeolites, metal-organic frameworks and carbons. During the past couple of decades, major advances were achieved in understanding and improving the performance of such materials, particularly in terms of CO2 adsorptive properties such as adsorption capacity, selectivity and kinetics. Nonetheless, to pave the way toward commercialization of adsorption-based CO2 capture technologies, in addition to other attributes, adsorbent materials should be stable over many thousands of adsorption-desorption cycles. Adsorbent stability, which is of utmost importance as it determines adsorbent lifetime and operational costs of CO2 capture, is a multifaceted issue involving thermal, hydrothermal, and chemical stability. Here we discuss the impact of the adsorbent physical and chemical properties, the feed gas composition and characteristics, and the adsorption-desorption operational parameters on the long-term stability of amine-functionalized CO2 adsorbents. We also review important insights associated with the underlying deactivation pathways of the adsorbents upon exposure to high temperature, oxygen, dry CO2, sulfur-containing compounds, nitrogen oxides, oxygen and steam. Finally, specific recommendations are provided to address outstanding stability issues.
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Affiliation(s)
- Masoud Jahandar Lashaki
- Centre for Catalysis Research and Innovation, Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada.
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16
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Joshi JN, Zhu G, Lee JJ, Carter EA, Jones CW, Lively RP, Walton KS. Probing Metal-Organic Framework Design for Adsorptive Natural Gas Purification. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:8443-8450. [PMID: 29940736 DOI: 10.1021/acs.langmuir.8b00889] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Parent and amine-functionalized analogues of metal-organic frameworks (MOFs), UiO-66(Zr), MIL-125(Ti), and MIL-101(Cr), were evaluated for their hydrogen sulfide (H2S) adsorption efficacy and post-exposure acid gas stability. Adsorption experiments were conducted through fixed-bed breakthrough studies utilizing multicomponent 1% H2S/99% CH4 and 1% H2S/10% CO2/89% CH4 natural gas simulant mixtures. Instability of MIL-101(Cr) materials after H2S exposure was discovered through powder X-ray diffraction and porosity measurements following adsorbent pelletization, whereas other materials retained their characteristic properties. Linker-based amine functionalities increased H2S breakthrough times and saturation capacities from their parent MOF analogues. Competitive CO2 adsorption effects were mitigated in mesoporous MIL-101(Cr) and MIL-101-NH2(Cr), in comparison to microporous UiO-66(Zr) and MIL-125(Ti) frameworks. This result suggests that the installation of H2S binding sites in large-pore MOFs could potentially enhance H2S selectivity. In situ Fourier transform infrared measurements in 10% CO2 and 5000 ppm H2S environments suggest that framework hydroxyl and amine moieties serve as H2S physisorption sites. Results from this study elucidate design strategies and stability considerations for engineering MOFs in sour gas purification applications.
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Affiliation(s)
- Jayraj N Joshi
- School of Chemical & Biomolecular Engineering , Georgia Institute of Technology , 311 Ferst Drive NW , Atlanta , Georgia 30332 , United States
| | - Guanghui Zhu
- School of Chemical & Biomolecular Engineering , Georgia Institute of Technology , 311 Ferst Drive NW , Atlanta , Georgia 30332 , United States
| | - Jason J Lee
- School of Chemical & Biomolecular Engineering , Georgia Institute of Technology , 311 Ferst Drive NW , Atlanta , Georgia 30332 , United States
| | - Eli A Carter
- School of Chemical & Biomolecular Engineering , Georgia Institute of Technology , 311 Ferst Drive NW , Atlanta , Georgia 30332 , United States
| | - Christopher W Jones
- School of Chemical & Biomolecular Engineering , Georgia Institute of Technology , 311 Ferst Drive NW , Atlanta , Georgia 30332 , United States
| | - Ryan P Lively
- School of Chemical & Biomolecular Engineering , Georgia Institute of Technology , 311 Ferst Drive NW , Atlanta , Georgia 30332 , United States
| | - Krista S Walton
- School of Chemical & Biomolecular Engineering , Georgia Institute of Technology , 311 Ferst Drive NW , Atlanta , Georgia 30332 , United States
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17
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Sharma P, Chakrabarty S, Roy S, Kumar R. Molecular View of CO 2 Capture by Polyethylenimine: Role of Structural and Dynamical Heterogeneity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:5138-5148. [PMID: 29641903 DOI: 10.1021/acs.langmuir.8b00204] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The molecular thermodynamics and kinetics of CO2 sorption in Polyethylenimine (PEI) melt have been investigated systematically using GCMC and MD simulations. We elucidate presence of significant structural and dynamic heterogeneity associated with the overall absorption process. CO2 adsorption in a PEI membrane shows a distinct two-stage process of a rapid CO2 adsorption at the interfaces (hundreds of picoseconds) followed by a significantly slower diffusion limited release toward the interior bulk regions of PEI melt (hundreds of nanoseconds to microseconds). The spatial heterogeneity of local structural features of the PEI chains lead to significantly heterogeneous absorption characterized by clustering and trapping of CO2 molecules that then lead to subdiffusive motion of CO2. In the complex interplay of interaction and entropy, the latter emerges out to be the major determining factor with significantly higher solubility of CO2 near the interfaces despite having lower density of binding amine groups. Regions having higher free-volume (entropically favorable) viz. interfaces, pores and loops demonstrate higher CO2 capture ability. Various local structural features of PEI conformations, for example, inter- and intrachain loops, pores of different radii, and di- or tricoordinated pores are explored for their effects on the varying CO2 adsorption abilities.
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Affiliation(s)
- Pragati Sharma
- Physical and Materials Chemistry Division , CSIR-National Chemical Laboratory , Dr. Homi Bhabha Road , Pune - 411 008 , India
- Academy of Scientific and Innovative Research , Delhi - Mathura Road , New Delhi 110025 , India
| | - Suman Chakrabarty
- School of Chemical Sciences , National Institute of Science Education and Research , P.O. Bhimpur-Padanpur , Via Jatni, Khurda Odisha 752050 , India
| | - Sudip Roy
- Physical and Materials Chemistry Division , CSIR-National Chemical Laboratory , Dr. Homi Bhabha Road , Pune - 411 008 , India
| | - Rajnish Kumar
- Department of Chemical Engineering , Indian Institute of Technology Madras , Chennai 600 036 , Tamil Nadu India
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