1
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Chang RW, Liou SYH, Lin CJ. Titania spheres with nanochannel-restricted NaNO 2/MgO for improving cyclic CO 2 adsorption stability. ENVIRONMENTAL TECHNOLOGY 2024; 45:272-282. [PMID: 35861580 DOI: 10.1080/09593330.2022.2105170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Accepted: 07/13/2022] [Indexed: 06/15/2023]
Abstract
NaNO2/MgO/titania spheres prepared via aerosol-assisted self-assembly (AASA) were used as sorbents for CO2 adsorption at moderate temperature. The titania framework as support would allow MgO to disperse well, thereby increasing the contact between MgO and NaNO2 to enhance carbonation. In this study, the effect of Mg/Ti molar ratio and NaNO2 addition amount on CO2 adsorption was investigated. Results showed that the sorbent prepared by AASA with Mg/Ti molar ratio of 2 following the introduction of 30 wt% NaNO2 presented ∼1 μm particle size with rough sphere surface morphology and mesoporous properties, where the surface area and pore volume were 72 m2/g and 0.18 cm3/g, respectively. With NaNO2 addition, the kinetics and capacity of CO2 adsorption significant increased. In the cyclic adsorption/desorption experiment, the superior stability over the NaNO2/MgO/titania spheres was mainly ascribed to the confined space suppressed the degree of the sintering effect. These results indicated the potential application of the nanochannel-restricted sorbent for rapid, high-capacity, and stable CO2 capture at moderate temperatures.
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Affiliation(s)
- Ren Wei Chang
- Department of Geosciences, National Taiwan University, Taipei, Taiwan
- Research Center for Future Earth, National Taiwan University, Taipei, Taiwan
| | - Sofia Ya Hsuan Liou
- Department of Geosciences, National Taiwan University, Taipei, Taiwan
- Research Center for Future Earth, National Taiwan University, Taipei, Taiwan
| | - Chin Jung Lin
- Department of Environmental Engineering, National Ilan University, Yilan, Taiwan
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2
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Rekhtina M, Krödel M, Wu YH, Kierzkowska A, Donat F, Abdala PM, Müller CR. Deciphering the structural dynamics in molten salt-promoted MgO-based CO 2 sorbents and their role in the CO 2 uptake. SCIENCE ADVANCES 2023; 9:eadg5690. [PMID: 37379379 DOI: 10.1126/sciadv.adg5690] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 05/23/2023] [Indexed: 06/30/2023]
Abstract
The development of effective CO2 sorbents is vital to achieving net-zero CO2 emission targets. MgO promoted with molten salts is an emerging class of CO2 sorbents. However, the structural features that govern their performance remain elusive. Using in situ time-resolved powder x-ray diffraction, we follow the structural dynamics of a model NaNO3-promoted, MgO-based CO2 sorbent. During the first few cycles of CO2 capture and release, the sorbent deactivates owing to an increase in the sizes of the MgO crystallites, reducing in turn the abundance of available nucleation points, i.e., MgO surface defects, for MgCO3 growth. After the third cycle, the sorbent shows a continuous reactivation, which is linked to the in situ formation of Na2Mg(CO3)2 crystallites that act effectively as seeds for MgCO3 nucleation and growth. Na2Mg(CO3)2 forms due to the partial decomposition of NaNO3 during regeneration at T ≥ 450°C followed by carbonation in CO2.
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Affiliation(s)
- Margarita Rekhtina
- Laboratory of Energy Science and Engineering, Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, 8092 Zürich, Switzerland
| | - Maximilian Krödel
- Laboratory of Energy Science and Engineering, Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, 8092 Zürich, Switzerland
| | - Yi-Hsuan Wu
- Laboratory of Energy Science and Engineering, Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, 8092 Zürich, Switzerland
| | - Agnieszka Kierzkowska
- Laboratory of Energy Science and Engineering, Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, 8092 Zürich, Switzerland
| | - Felix Donat
- Laboratory of Energy Science and Engineering, Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, 8092 Zürich, Switzerland
| | - Paula M Abdala
- Laboratory of Energy Science and Engineering, Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, 8092 Zürich, Switzerland
| | - Christoph R Müller
- Laboratory of Energy Science and Engineering, Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, 8092 Zürich, Switzerland
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3
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The Kinetics of Sorption–Desorption Phenomena: Local and Non-Local Kinetic Equations. Molecules 2022; 27:molecules27217601. [DOI: 10.3390/molecules27217601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 10/24/2022] [Accepted: 11/02/2022] [Indexed: 11/09/2022] Open
Abstract
The kinetics of adsorption phenomena are investigated in terms of local and non-local kinetic equations of the Langmuir type. The sample is assumed in the shape of a slab, limited by two homogeneous planar-parallel surfaces, in such a manner that the problem can be considered one-dimensional. The local kinetic equations in time are analyzed when both saturation and non-saturation regimes are considered. These effects result from an extra dependence of the adsorption coefficient on the density of adsorbed particles, which implies the consideration of nonlinear balance equations. Non-local kinetic equations, arising from the existence of a time delay characterizing a type of reaction occurring between a bulk particle and the surface, are analyzed and show the existence of adsorption effects accompanied by temporal oscillations.
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4
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Sun Z, Shao B, Zhang Y, Gao Z, Wang M, Liu H, Hu J. Integrated CO2 capture and methanation from the intermediate-temperature flue gas on dual functional hybrids of AMS/CaMgO||Ni Co. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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5
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Muntaha N, Rain MI, Goni LKMO, Shaikh MAA, Jamal MS, Hossain M. A Review on Carbon Dioxide Minimization in Biogas Upgradation Technology by Chemical Absorption Processes. ACS OMEGA 2022; 7:33680-33698. [PMID: 36188320 PMCID: PMC9520701 DOI: 10.1021/acsomega.2c03514] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Accepted: 08/25/2022] [Indexed: 06/16/2023]
Abstract
With an ever-increasing population and unpredictable climate changes, meeting energy demands and maintaining a sustainable environment on Earth are two of the greatest challenges of the future. Biogas can be a very significant renewable source of energy that can be used worldwide. However, to make it usable, upgrading the gas by removing the unwanted components is a very crucial step. CO2 being one of the major unwanted components and also being a major greenhouse gas must be removed efficiently. Different methods such as physical adsorption, cryogenic separation, membrane separation, and chemical absorption have been discussed in detail in this review because of their availability, economic value, and lower environmental footprint. Three chemical absorption methods, including alkanolamines, alkali solvents, and amino acid salt solutions, are discussed. Their primary works with simple chemicals along with the latest works with more complex chemicals and different mechanical processes, such as the DECAB process, are discussed and compared. These discussions provide valuable insights into how different processes vary and how one is more advantageous or disadvantageous than the others. However, the best method is yet to be found with further research. Overall, this review emphasizes the need for biogas upgrading, and it discusses different methods of carbon capture while doing that. Methods discussed here can be a basic foundation for future research in carbon capture and green chemistry. This review will enlighten the readers about scientific and technological challenges regarding carbon dioxide minimization in biogas technology.
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Affiliation(s)
- Nuzhat Muntaha
- Institute
of Fuel Research and Development, Bangladesh
Council of Scientific and Industrial Research (BCSIR), Dhaka1205, Bangladesh
| | - Mahmudul I. Rain
- Institute
of Fuel Research and Development, Bangladesh
Council of Scientific and Industrial Research (BCSIR), Dhaka1205, Bangladesh
- Department
of Chemistry, Jahangirnagar University, Savar, Dhaka1342, Bangladesh
| | - Lipiar K. M. O. Goni
- Institute
of Fuel Research and Development, Bangladesh
Council of Scientific and Industrial Research (BCSIR), Dhaka1205, Bangladesh
| | - Md. Aftab Ali Shaikh
- Bangladesh
Council of Scientific and Industrial Research (BCSIR), Dr. Qudrat-I-Khuda Road, Dhanmondi, Dhaka1205, Bangladesh
- Department
of Chemistry, University of Dhaka, Dhaka1000, Bangladesh
| | - Mohammad S. Jamal
- Institute
of Fuel Research and Development, Bangladesh
Council of Scientific and Industrial Research (BCSIR), Dhaka1205, Bangladesh
| | - Mosharof Hossain
- Institute
of Fuel Research and Development, Bangladesh
Council of Scientific and Industrial Research (BCSIR), Dhaka1205, Bangladesh
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6
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Choi D, Park Y. Structural modification of salt-promoted MgO sorbents for intermediate temperature CO 2 capture. NANOSCALE ADVANCES 2022; 4:3083-3090. [PMID: 36133521 PMCID: PMC9417095 DOI: 10.1039/d2na00213b] [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: 04/05/2022] [Accepted: 06/09/2022] [Indexed: 06/16/2023]
Abstract
MgO-based sorbents are a promising option for CO2 capture at intermediate temperatures. MgO-based sorbents are often hybridized with alkali metal salts to promote the CO2 capture performance. However, MgO-based sorbents often suffer a rapid decrement of CO2 capture performance during multicycle carbonation-calcination reactions due to the reduction of active sites. In this study, we attempted to enhance the durability of MgO-based sorbents by modifying their morphology. A tubular-shaped MgO-based sorbent was synthesized using a carbon nanotube template. Various characterization experiments and evaluations were performed with the synthesized MgO-based materials. The MgO sample with modified structure exhibited a specific morphology consisting of elongated plate-like structures separated by empty spaces. This separation is expected to prevent MgO agglomeration and preserve the modified morphology during iterative CO2 capture reactions. The MgO with modified structure achieved higher cycling stability with four times slower performance decay than the control MgO, even though identical chemical compositions were applied.
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Affiliation(s)
- Dasol Choi
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST) 123 Cheomdangwagi-ro, Buk-gu Gwangju 61005 Republic of Korea
| | - Youngjune Park
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST) 123 Cheomdangwagi-ro, Buk-gu Gwangju 61005 Republic of Korea
- Research Center for Innovative Energy and Carbon Optimized Synthesis for Chemicals (Inn-ECOSysChem), Gwangju Institute of Science and Technology (GIST) 123 Cheomdangwagi-ro, Buk-gu Gwangju 61005 Republic of Korea
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7
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Papalas T, Antzaras AN, Lemonidou AA. Magnesite-derived MgO promoted with molten salts and limestone as highly-efficient CO2 sorbent. J CO2 UTIL 2021. [DOI: 10.1016/j.jcou.2021.101725] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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8
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Dunstan MT, Donat F, Bork AH, Grey CP, Müller CR. CO 2 Capture at Medium to High Temperature Using Solid Oxide-Based Sorbents: Fundamental Aspects, Mechanistic Insights, and Recent Advances. Chem Rev 2021; 121:12681-12745. [PMID: 34351127 DOI: 10.1021/acs.chemrev.1c00100] [Citation(s) in RCA: 67] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Carbon dioxide capture and mitigation form a key part of the technological response to combat climate change and reduce CO2 emissions. Solid materials capable of reversibly absorbing CO2 have been the focus of intense research for the past two decades, with promising stability and low energy costs to implement and operate compared to the more widely used liquid amines. In this review, we explore the fundamental aspects underpinning solid CO2 sorbents based on alkali and alkaline earth metal oxides operating at medium to high temperature: how their structure, chemical composition, and morphology impact their performance and long-term use. Various optimization strategies are outlined to improve upon the most promising materials, and we combine recent advances across disparate scientific disciplines, including materials discovery, synthesis, and in situ characterization, to present a coherent understanding of the mechanisms of CO2 absorption both at surfaces and within solid materials.
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Affiliation(s)
- Matthew T Dunstan
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Felix Donat
- Laboratory of Energy Science and Engineering, Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, 8092 Zürich, Switzerland
| | - Alexander H Bork
- Laboratory of Energy Science and Engineering, Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, 8092 Zürich, Switzerland
| | - Clare P Grey
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Christoph R Müller
- Laboratory of Energy Science and Engineering, Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, 8092 Zürich, Switzerland
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9
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Papalas T, Polychronidis I, Antzaras AN, Lemonidou AA. Enhancing the intermediate-temperature CO2 capture efficiency of mineral MgO via molten alkali nitrates and CaCO3: Characterization and sorption mechanism. J CO2 UTIL 2021. [DOI: 10.1016/j.jcou.2021.101605] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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10
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Peering into buried interfaces with X-rays and electrons to unveil MgCO 3 formation during CO 2 capture in molten salt-promoted MgO. Proc Natl Acad Sci U S A 2021; 118:2103971118. [PMID: 34140337 DOI: 10.1073/pnas.2103971118] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The addition of molten alkali metal salts drastically accelerates the kinetics of CO2 capture by MgO through the formation of MgCO3 However, the growth mechanism, the nature of MgCO3 formation, and the exact role of the molten alkali metal salts on the CO2 capture process remain elusive, holding back the development of more-effective MgO-based CO2 sorbents. Here, we unveil the growth mechanism of MgCO3 under practically relevant conditions using a well-defined, yet representative, model system that is a MgO(100) single crystal coated with NaNO3 The model system is interrogated by in situ X-ray reflectometry coupled with grazing incidence X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy. When bare MgO(100) is exposed to a flow of CO2, a noncrystalline surface carbonate layer of ca. 7-Å thickness forms. In contrast, when MgO(100) is coated with NaNO3, MgCO3 crystals nucleate and grow. These crystals have a preferential orientation with respect to the MgO(100) substrate, and form at the interface between MgO(100) and the molten NaNO3 MgCO3 grows epitaxially with respect to MgO(100), and the lattice mismatch between MgCO3 and MgO is relaxed through lattice misfit dislocations. Pyramid-shaped pits on the surface of MgO, in proximity to and below the MgCO3 crystals, point to the etching of surface MgO, providing dissolved [Mg2+…O2-] ionic pairs for MgCO3 growth. Our studies highlight the importance of combining X-rays and electron microscopy techniques to provide atomic to micrometer scale insight into the changes occurring at complex interfaces under reactive conditions.
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11
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Deng J, Zou W, Mi J, Du Z, Kong P, Zhang C. Construction of Porous Polymer Beads for CO 2 Capture in a Fluidized Bed with High Stability. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c00721] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jingqian Deng
- Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology), Ministry of Education, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Wei Zou
- Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology), Ministry of Education, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Jianguo Mi
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Zhongjie Du
- Sinochem Petrochemical Distribution Company LTD, Shanghai 201103, PR China
| | - Peng Kong
- Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology), Ministry of Education, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Chen Zhang
- Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology), Ministry of Education, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China
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12
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Zhang H, Jiang T, Yaseen HASM, Zhao Y, Wang S, Ma X. Pelletization and attrition of CaO‐based adsorbent for CO
2
capture. ASIA-PAC J CHEM ENG 2021. [DOI: 10.1002/apj.2656] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Hao Zhang
- Key Laboratory for Green Chemical Technology, School of Chemical Engineering and Technology Tianjin University, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin China
| | - Tao Jiang
- Key Laboratory for Green Chemical Technology, School of Chemical Engineering and Technology Tianjin University, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin China
| | - Hamzah A. S. M. Yaseen
- Key Laboratory for Green Chemical Technology, School of Chemical Engineering and Technology Tianjin University, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin China
| | - Yujun Zhao
- Key Laboratory for Green Chemical Technology, School of Chemical Engineering and Technology Tianjin University, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin China
| | - Shengping Wang
- Key Laboratory for Green Chemical Technology, School of Chemical Engineering and Technology Tianjin University, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin China
| | - Xinbin Ma
- Key Laboratory for Green Chemical Technology, School of Chemical Engineering and Technology Tianjin University, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin China
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13
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Wei L, Wei W, Xue N, Cheng F, Yang H. One-Step Synthesis of Solid-Liquid Composite Microsphere for CO 2 Capture. ACS APPLIED MATERIALS & INTERFACES 2021; 13:5814-5822. [PMID: 33494605 DOI: 10.1021/acsami.0c19907] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The design and development of efficient adsorbents for CO2 capture is of paramount importance. Herein, we report a novel Pickering emulsion templating strategy to prepare a hierarchically structured, micrometer-sized solid-liquid composite microsphere (SLCM) for CO2 capture. This strategy enables us to introduce liquid amine into porous silica nanospheres which are encapsulated by the hydrophobic shell of micrometer-sized sphere through a one-step synthesis. The interior architectures, microsphere sizes, and anime loading can be facilely tuned through varying the synthesis conditions. The developed SLCM exhibits excellent CO2 adsorption capacity, fast adsorption kinetics, long-term recyclability, and reduced loss of amine in industrially preferred fixed-bed reactors. Interestingly, it was found that the adsorption behavior was dependent on the interior structure of SLCM. This study opens a new way to design efficient solid-liquid composite materials.
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Affiliation(s)
- Lijuan Wei
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China
- Chemistry and Chemical Engineering College, Xianyang Normal University, Xianyang 712000, China
| | - Wei Wei
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China
| | - Nan Xue
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China
| | - Fangqin Cheng
- CO2 Emission Reduction and Utilization Engineering Center of National Education Ministry, Shanxi University, Taiyuan 030006, China
| | - Hengquan Yang
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China
- CO2 Emission Reduction and Utilization Engineering Center of National Education Ministry, Shanxi University, Taiyuan 030006, China
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14
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Ruhaimi A, Aziz M, Jalil A. Magnesium oxide-based adsorbents for carbon dioxide capture: Current progress and future opportunities. J CO2 UTIL 2021. [DOI: 10.1016/j.jcou.2020.101357] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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15
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Rekhtina M, Dal Pozzo A, Stoian D, Armutlulu A, Donat F, Blanco MV, Wang ZJ, Willinger MG, Fedorov A, Abdala PM, Müller CR. Effect of molten sodium nitrate on the decomposition pathways of hydrated magnesium hydroxycarbonate to magnesium oxide probed by in situ total scattering. NANOSCALE 2020; 12:16462-16473. [PMID: 32478776 DOI: 10.1039/d0nr01760d] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The effect of NaNO3 and its physical state on the thermal decomposition pathways of hydrated magnesium hydroxycarbonate (hydromagnesite, HM) towards MgO was examined by in situ total scattering. Pair distribution function (PDF) analysis of these data allowed us to probe the structural evolution of pristine and NaNO3-promoted HM. A multivariate curve resolution alternating least squares (MCR-ALS) analysis identified the intermediate phases and their evolution upon the decomposition of both precursors to MgO. The total scattering results are discussed in relation with thermogravimetric measurements coupled with off-gas analysis. MgO is obtained from pristine HM (N2, 10 °C min-1) through an amorphous magnesium carbonate intermediate (AMC), formed after the partial removal of water of crystallization from HM. The decomposition continues via a gradual release of water (due to dehydration and dehydroxylation) and, in the last step, via decarbonation, leading to crystalline MgO. The presence of molten NaNO3 alters the decomposition pathways of HM, proceeding now through AMC and crystalline MgCO3. These results demonstrate that molten NaNO3 facilitates the release of water (from both water of crystallization and through dehydroxylation) and decarbonation, and promotes the crystallization of MgCO3 and MgO in comparison to pristine HM. MgO formed from the pristine HM precursor shows a smaller average crystallite size than NaNO3-promoted HM and preserves the initial nano-plate-like morphology of HM. NaNO3-promoted HM was decomposed to MgO that is characterized by a larger average crystallite size and irregular morphology. Additionally, in situ SEM allowed visualization of the morphological evolution of HM promoted with NaNO3 at a micrometre scale.
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Affiliation(s)
- Margarita Rekhtina
- Laboratory of Energy Science and Engineering, Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, 8092 Zürich, Switzerland.
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16
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Park SJ, Kim Y, Jones CW. NaNO 3 -Promoted Mesoporous MgO for High-Capacity CO 2 Capture from Simulated Flue Gas with Isothermal Regeneration. CHEMSUSCHEM 2020; 13:2988-2995. [PMID: 32166870 DOI: 10.1002/cssc.202000259] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 03/13/2020] [Indexed: 06/10/2023]
Abstract
NaNO3 -promoted MgO composite materials have been prepared and their ability to sorb CO2 at a concentration relevant to CO2 capture from flue gas is explored. The uptake kinetics and capacities of sorbents of different NaNO3 /MgO ratios are measured at intermediate temperatures of 230-300 °C. The sorbent with a NaNO3 /MgO ratio of 0.10 has the highest 12 h sorption capacity among sorbents with different NaNO3 loadings, and the highest sorption capacity of 11.2 mmol CO 2 g-1 is observed at 260 °C. Intriguingly, an induction period is observed in the initial stage of CO2 sorption. In situ XRD analysis, in situ FTIR spectroscopy, and a comparison of the CO2 sorption behavior under simulated flue gas conditions in comparison to prior studies employing pure CO2 indicated that the sorption of CO2 occurred through nucleation of MgCO3 crystallites in the material. The data indicate that the concentration of CO2 within the molten medium of NaNO3 , which is affected by both the solubility of CO2 in molten NaNO3 and the partial pressure of CO2 in the surrounding atmosphere, has a critical impact on the length of the induction period. A partially desorbed sample after sorption of CO2 displays much-improved sorption kinetics in the next cycle and was able to sorb and desorb CO2 over multiple cycles at isothermal conditions by simply switching the feed gas from CO2 to inert gas.
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Affiliation(s)
- Sang Jae Park
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Dr., Atlanta, GA, 30332-0100, USA
| | - Youngjo Kim
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Dr., Atlanta, GA, 30332-0100, USA
| | - Christopher W Jones
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Dr., Atlanta, GA, 30332-0100, USA
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17
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Zhang M, Li J, Zhao J, Cui Y, Luo X. Comparison of CH 4 and CO 2 Adsorptions onto Calcite(10.4), Aragonite(011)Ca, and Vaterite(010)CO 3 Surfaces: An MD and DFT Investigation. ACS OMEGA 2020; 5:11369-11377. [PMID: 32478225 PMCID: PMC7254519 DOI: 10.1021/acsomega.0c00345] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Accepted: 04/30/2020] [Indexed: 05/08/2023]
Abstract
The interaction between greenhouse gases (such as CH4 and CO2) and carbonate rocks has a significant impact on carbon transfer among different geochemical reservoirs. Moreover, CH4 and CO2 gases usually associate with oil and natural gas reserves, and their adsorption onto sedimentary rocks may influence the exploitation of fossil fuels. By employing the molecular dynamics (MD) and density functional theory (DFT) methods, the adsorptions of CH4 and CO2 onto three different CaCO3 polymorphs (i.e., calcite(10.4), aragonite(011)Ca, and vaterite(010)CO3) are compared in the present work. The calculated adsorption energies (E ad) are always negative for the three substrates, which indicates that their adsorptions are exothermic processes and spontaneous in thermodynamics. The E ad of CO2 is much more negative, which suggests that the CO2 adsorption will form stronger interfacial binding compared with the CH4 adsorption. The adsorption precedence of CH4 on the three surfaces is aragonite(011)Ca > vaterite(010)CO3 > calcite(10.4), while for CO2, the sequence is vaterite(010)CO3 > aragonite(011)Ca > calcite(10.4). Combining with the interfacial atomic configuration analysis, the Mulliken atomic charge distribution and overlap bond population are discussed. The results demonstrate that the adsorption of CH4 is physisorption and that its interfacial interaction mainly comes from the electrostatic effects between H in CH4 and O in CO3 2-, while the CO2 adsorption is chemisorption and the interfacial binding effect is mainly contributed by the bonds between O in CO2 and Ca2+ and the electrostatic interaction between C in CO2 and O in CO3 2-.
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Affiliation(s)
- Ming Zhang
- School
of Petroleum Engineering, Xi’an Shiyou
University, Xi’an 710065, China
| | - Jian Li
- School
of Materials Science and Engineering, Xi’an
Shiyou University, Xi’an 710065, China
| | - Junyu Zhao
- School
of Materials Science and Engineering, Xi’an
Shiyou University, Xi’an 710065, China
| | - Youming Cui
- School
of Materials Science and Engineering, Xi’an
Shiyou University, Xi’an 710065, China
| | - Xian Luo
- School
of Materials, Northwestern Polytechnical
University, Xi’an 710072, China
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Alami AH, Abu Hawili A, Tawalbeh M, Hasan R, Al Mahmoud L, Chibib S, Mahmood A, Aokal K, Rattanapanya P. Materials and logistics for carbon dioxide capture, storage and utilization. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 717:137221. [PMID: 32062241 DOI: 10.1016/j.scitotenv.2020.137221] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2020] [Revised: 02/03/2020] [Accepted: 02/07/2020] [Indexed: 06/10/2023]
Abstract
The efforts to curtail carbon dioxide presence in the atmosphere are a strong function of the available technologies to capture, store and usefully utilize it. Materials with adequate CO2 sorption kinetics that are both effective and economical are of prime importance for the whole capture system to be built around. This work identifies such materials that are currently used in CO2 adsorption beds/columns at different global locations, along with their vital operational parameters, logistics and costs. Three main classes of materials currently in use to that end are discussed in detail here, namely solid sorbents, advanced solvents membrane systems. These materials are then compared in terms of their potential CO2 uptake, operating parameters and ease of use and implementation of the respective technology. Tabular data are appended to each technology covered with the most relevant advantages and disadvantages. With such comprehensive survey of the recent state-of-the-art materials, recommendations are also made to facilitate the selection of systems based on their CO2 yield, price and suitability to the geographical location.
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Affiliation(s)
- Abdul Hai Alami
- Sustainable and Renewable Energy Engineering, University of Sharjah, PO Box 27272, Sharjah, United Arab Emirates; Center for Advanced Materials Research, Research Institute of Science and Engineering (RISE), University of Sharjah, PO Box 27272, Sharjah, United Arab Emirates.
| | | | - Muhammad Tawalbeh
- Sustainable and Renewable Energy Engineering, University of Sharjah, PO Box 27272, Sharjah, United Arab Emirates
| | - Rita Hasan
- Mechanical Engineering Department, University of Sharjah, PO Box 27272, Sharjah, United Arab Emirates
| | - Lana Al Mahmoud
- Sustainable and Renewable Energy Engineering, University of Sharjah, PO Box 27272, Sharjah, United Arab Emirates
| | - Sara Chibib
- Sustainable and Renewable Energy Engineering, University of Sharjah, PO Box 27272, Sharjah, United Arab Emirates
| | - Anfal Mahmood
- Sustainable and Renewable Energy Engineering, University of Sharjah, PO Box 27272, Sharjah, United Arab Emirates
| | - Kamilia Aokal
- Center for Advanced Materials Research, Research Institute of Science and Engineering (RISE), University of Sharjah, PO Box 27272, Sharjah, United Arab Emirates
| | - Pawarin Rattanapanya
- Chemical Engineering Department, Khonkaen University, PO Box 40000, Khonkaen, Thailand
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