Article
Engineering, Environmental
A. Catarina Faria, R. Trujillano, V. Rives, C. V. Miguel, A. E. Rodrigues, Luis M. Madeira
Summary: This study aims to find a CO2 HT-based sorbent with promising behavior in terms of sorption capacity, sorption kinetics, and cyclic stability during continuous sorption/desorption cycles. The best performance was observed for CHT doped with 9.4 wt% of Cs. A study on the cyclic stability of this material was conducted, and a kinetic model predicting the loss of sorption capacity with cycles was successfully developed.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Zhen Wang, Chenteng Sun, Qian Xu, Xingli Zou, Hongwei Cheng, Xionggang Lu
Summary: This study thermodynamically evaluated the reaction between CO2 and Li2CaSiO4 and examined the CO2 adsorption performance of synthesized Li2CaSiO4 with and without alkali carbonates using thermal analyses. The results showed that alkali carbonates can improve the kinetics and facilitate the CO2 adsorption of Li2CaSiO4.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Engineering, Environmental
Wanlin Gao, Michalis A. Vasiliades, Constantinos M. Damaskinos, Meng Zhao, Wenqi Fan, Qiang Wang, Tomas Ramirez Reina, Angelos M. Efstathiou
Summary: By adding molten salt modifiers, the CO2 uptake of MgO-based CO2 adsorbents can be increased, with three different processes identified for the interaction of molten salt-promoted MgO with CO2 at 300 degrees C. Transient kinetic studies coupled with mass spectrometry provided a thorough understanding of the CO2-capturing performance and its significant implications for future practical designs of precombustion CO2 capture.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Meifang Li, Ping Wang, Chenxi Huang, Yunguo Liu, Shaobo Liu, Ke Zhang, Jingxiao Cao, Xiaofei Tan, Shaoheng Liu
Summary: Humic acids (HAs), which are widely present in water environment, have a significant impact on the adsorption of pollutants. This study investigated the effect of dissolved and coated HAs on the removal of the organic contaminant tetracycline (TC) by K2CO3 modified magnetic biochar (KMBC). The results showed that low concentration of dissolved HAs promoted TC removal, while higher concentration of dissolved HAs inhibited TC adsorption. Coated HAs changed the surface and pore characteristics of KMBC, suppressing TC removal.
SCIENTIFIC REPORTS
(2022)
Article
Nanoscience & Nanotechnology
Kyung Seob Song, Siddulu Naidu Talapaneni, Timur Ashirov, Ali Coskun
Summary: The use of reactive molten salts, such as ZnCl2, as soft templates and catalysts in the synthesis of covalent triazine frameworks (CTFs) has been explored. By utilizing isocyanate moieties and alkali metal ions, the efficient salt templating of covalent isocyanurate frameworks (CICFs) with high microporosity and nitrogen content was achieved. The ion-dipole interactions between alkali metal cations and oxygen atoms facilitated the formation of purely microporous structures, leading to improved gas adsorption properties.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Dequan Zou, Xiangji Yue, Tianyi He, Jianan Ding, Dechun Ba
Summary: The preparation process of K2CO3/EVM composite material was studied in this paper, and the performance was improved by optimizing the preparation plan. Experimental results showed that the vacuum degree and particle size of expanded vermiculite have significant effects on the performance of the composite material.
Article
Energy & Fuels
Natalia Mazur, Henk Huinink, Hartmut Fischer, Olaf Adan
Summary: This study investigates the reactions occurring in K2CO3-H2O-CO2 under conditions applicable for domestic thermochemical heat storage. The primary product of the reaction can be K2CO3·1.5H2O, K2CO3·2KHCO3·1.5H2O, or a mixture of both, depending on the reaction conditions. The formation of K2CO3·1.5H2O is preferred above the equilibrium conditions, while the formation of double salt is preferred when hydration reaction is inhibited. A new phase transition line corresponding to the formation of K2CO3·2KHCO3 was identified. The formation of K2CO3·2KHCO3·(1.5H2O) increases the minimum charging temperature, but the energy density and cyclability can be preserved if the double salt is decomposed after each cycle.
Article
Environmental Sciences
Minji Park, Sookyung Kim, Young-Soo Han, Sung Pil Hyun, Hoon Young Jeong
Summary: In this study, thermal treatment of partially Co2+-exchanged zeolite X was found to alter the coordination structure of Co2+ and reduce the risk of re-mobilization. High temperature treatment resulted in the formation of surface precipitates and hydrotalcite-like phases, as well as the extraction of framework Al.
Article
Polymer Science
Natalia Volkova, Dmitriy Berillo
Summary: Water sorption properties of macroporous cryogels of gelatine and dextran dialdehyde were investigated using two methods at 293 K. The GAB model showed good correlation with experimental data for the whole range of water activities.
Article
Engineering, Environmental
Peng Yang, Nikhil Rampal, Juliane Weber, Jacquelyn N. Bracco, Paul Fenter, Andrew G. Stack, Sang Soo Lee
Summary: The study found synergistically enhanced uptake of lead and selenate on the barite surface through multiple mechanisms, with increasing co-sorbed ion coverages leading to a systematic increase in sorption affinity. Computational simulations showed thermodynamically favorable co-incorporation of lead and selenate on the mineral surface.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Xuefeng Wang, Cunbao Deng, Ling Qiao, Ge Chu, Rui Jing, Yanlei Kang
Summary: The study found that moisture, pH value, and coal rank all affect the adsorption capacity of coal for CO2. Acid treatment and alkaline treatment can enhance the adsorption capacity of coal, while the presence of moisture inhibits the adsorption process.
Article
Materials Science, Multidisciplinary
Luis A. Lozano, Luis A. Salazar Hoyos, Betina M. C. Faroldi, Juan M. Zamaro
Summary: Research shows that exposure to ultraviolet light can significantly increase the CO2 uptake capacity of the metal-organic framework UiO-66. This is achieved through the generation of cluster defects in nanoregions of the framework while maintaining its overall structure and crystallinity. This treatment method provides a simple, short, and sustainable way to enhance the CO2 capture of UiO-66, preserving its structural integrity and robustness without the use of chemicals.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Construction & Building Technology
Arfah Shawati Boneka, Mohd Khairun Anwar Uyup, Lee Seng Hua, Nordahlia Abdullah Siam, Sabiha Salim, Zaidon Ashaari
Summary: Treating kedondong wood with low molecular weight phenol formaldehyde resin can effectively reduce its hygroscopicity, improve physical properties and anti-swelling efficiency, and reduce surface wettability.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Physical
Huawu Xu, Yuanwu Hu, Zhenmin Cheng, Zhiming Zhou
Summary: This study prepared a series of Mg-Al hydrotalcite-based CO2 sorbents and found that LDO_10 has a higher CO2 adsorption uptake due to its large surface area. After doping with M2CO3, the resulting M-LDO_10 sorbents show different CO2 uptake, with K-LDO_10 having the highest. By combining K-LDO_10 with Cu/Ce0.6 Zr0.4O2, stable production of high-purity hydrogen is achieved but with a short duration time.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Minh Nguyen-Quang, Federico Azzolina-Jury, Bogdan Samojeden, Monika Motak, Patrick Da Costa
Summary: In this work, a series of NiMgAl oxides derived from hydrotalcite catalysts were prepared using different techniques and tested for CO2 methanation. The NMA-UH catalyst prepared by urea hydrolysis showed high and stable catalytic activity in terms of CO2 conversion and CH4 selectivity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Junyoung Cha, Taeho Lee, Yu-Jin Lee, Hyangsoo Jeong, Young Suk Jo, Yongmin Kim, Suk Woo Nam, Jonghee Han, Ki Bong Lee, Chang Won Yoon, Hyuntae Sohn
Summary: The study investigated the preparation method and catalytic performance of nanometer-sized Ru particles deposited on four different alkali-exchanged zeolite Y supports. The results showed that Ru/Rb-Y exhibited the highest catalytic activity, mainly attributed to the high basicity of Rb-Y zeolite and the confined dispersion of Ru particles, which led to an open pore structure of the zeolite.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Energy & Fuels
Jun Woo Park, Yunju Cho, Seungwoo Son, Sunghwan Kim, Ki Bong Lee
Summary: FT-ICR MS was used to analyze SARA fractions in heavy oils, particularly focusing on the structure of asphaltenes. Through categorizing the asphaltenes based on heteroatom classes, different trends in DBE distribution were observed. The compositional space of DBE and carbon number was divided into four groups based on relative abundance peaks, representing different structural types of asphaltenes.
Article
Energy & Fuels
Dahye Song, Unho Jung, Hyo Been Im, Tae Ho Lee, Young-Eun Kim, Ki Bong Lee, Kee Young Koo
Summary: The study found that loading highly dispersed Ru on Ni/MgAl2O4 catalyst can enhance methane conversion in DRM reaction, with Ru(D)/Ni(I)/MgAl2O4 catalyst showing the best performance in terms of high metal dispersion and CO2 desorption. Additionally, minimal coke deposition was observed during stability tests.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2022)
Review
Green & Sustainable Science & Technology
Qingyin Li, Xiangzhou Yuan, Xun Hu, Erik Meers, Hwai Chyuan Ong, Wei-Hsin Chen, Peigao Duan, Shicheng Zhang, Ki Bong Lee, Yong Sik Ok
Summary: Liquefaction is an attractive technology for converting biomass into bio-oil without drying the feedstock, and is conducted at relatively low temperatures. Co-liquefaction of different biomass feedstocks can enhance the liquefaction degree and chemical properties of the resulting bio-oil. Understanding the interaction during co-liquefaction process is important for tuning the chemical species and yield of the bio-oil. Operational parameters and mixing ratios of different biomasses also play a significant role in the co-liquefaction behavior.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Chemistry, Physical
Da Hye Song, Un Ho Jung, Young Eun Kim, Hyo Been Im, Tae Ho Lee, Ki Bong Lee, Kee Young Koo
Summary: The dependence of catalytic activity and coke resistance of Ni-based catalysts on the support type was investigated in the dry reforming of methane. It was found that Ni/Al2O3 and Ni/MgO catalysts formed corresponding solid solutions, while MgO-Al2O3 and MgAl2O4 supports suppressed the formation of solid solutions. Ni/MgO-Al2O3 and Ni/MgAl2O4 catalysts showed higher methane conversion rates compared to other catalysts. Moreover, catalysts with higher alkaline-earth metal content exhibited better coke resistance.
Article
Biochemistry & Molecular Biology
Prem P. Sharma, Rahul Singh, Syed Abdullah Shah, Cheol Hun Yoo, Albert S. Lee, Daejoong Kim, Jeong-Geol Na, Jong Suk Lee
Summary: In this study, a nano-composite material for reverse electrodialysis (RED) was reported, which improved ion conduction by rearranging the polymer structure, resulting in enhanced efficiency of the nanomembrane.
Article
Biotechnology & Applied Microbiology
Hoa Thi Quynh Le, Dung Hoang Anh Mai, Jeong-Geol Na, Eun Yeol Lee
Summary: In this study, a host strain for violacein production from non-sugar feedstocks, Methylorubrum extorquens AM1, was engineered using metabolic engineering. The results showed that by optimizing expression vectors and inducer concentrations, violacein production using methanol as the sole substrate was achieved. Random mutagenesis and site-directed mutagenesis further improved the production, and co-utilization of methanol and acetate significantly enhanced violacein production. This research provides a platform for economically efficient large-scale fermentation system for violacein production.
METABOLIC ENGINEERING
(2022)
Article
Engineering, Chemical
Pil-Sang Youn, Dong Hun Lee, Daewook Kim, Yoo Seob Won, Jeong-Hoo Choi, Ji Bong Joo, Ho -Jung Ryu
Summary: This study investigated the relationship between external solids circulation rate and solids inventory in the riser of the circulating fluidized bed (CFB). The findings can provide valuable insights for improving the efficiency of CFB systems.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Chemistry, Physical
Seok Hwan Yang, Wonsang Jung, Hyeonggeon Lee, Sang-Hun Shin, Seung Jae Lee, Min Suc Cha, Woong Choi, Seong-Geun Oh, Ki Bong Lee, Ung Lee, Da Hye Won, Jang Yong Lee
Summary: This study demonstrates the commercial viability of a polycarbazole-based anion-conducting material, HQPC-tmIM, as an anion exchange membrane for electrochemical CO2 reduction (eCO2R). The research also reveals through simulation that the well-constructed membrane morphology of HQPC-tmIM leads to outstanding membrane conductivity and enables high CO partial current density. The findings provide guidelines for developing commercially viable anion exchange membranes and ionomers for eCO2R.
ACS ENERGY LETTERS
(2023)
Article
Microbiology
Selim Ashoor, Seong-Hoon Jun, Han Do Ko, Jinwon Lee, Jerome Hamelin, Kim Milferstedt, Jeong-Geol Na
Summary: A syntrophic process utilizing methanotrophs and oxygenic photogranules (OPGs) was developed to produce polyhydroxy-beta-butyrate (PHB) from a gas stream containing CH4 and CO2 without external oxygen supply. The role of O2 in the synergy was confirmed and M. trichosporium OB3b with OPGs was selected for methane conversion and PHB production. Nitrogen limitation stimulated PHB accumulation in methanotrophs but hindered the growth of the syntrophic consortium. Under a nitrogen source concentration of 2.9 mM, 1.13 g/L of biomass and 83.0 mg/L of PHB could be obtained from simulated biogas. These results demonstrate the efficient conversion of greenhouse gases into valuable products through syntrophy.
Review
Biotechnology & Applied Microbiology
Selim Ashoor, Tae Uk Khang, Young Hoon Lee, Ji Sung Hyung, Seo Young Choi, Sang Eun Lim, Jinwon Lee, Si Jae Park, Jeong-Geol Na
Summary: Pyrolysis, a thermal decomposition technique, can extract transportable liquids from lignocellulosic biomass. However, the hydrophilic products of pyrolysis have undesirable characteristics, necessitating additional upgrading processes. Biological methods can address these drawbacks by utilizing hydrophilic compounds as carbon sources under mild conditions. This review investigates the potential of bioconversion routes for upgrading the aqueous phase of pyrolysis oil, considering the presence of toxic compounds and the complex composition of the aqueous phase.
BIORESOURCES AND BIOPROCESSING
(2023)
Article
Engineering, Chemical
Dong Hun Lee, Daewook Kim, Yoo Sube Won, Jeong-Hoo Choi, Ji Bong Joo, Ho-Jung Ryu
Summary: This study investigated the flow rate of solids through the recycle chamber of a loop seal in a circulating fluidized bed at atmospheric pressure and temperature. Experimental data were used to derive relationships between the flow rate of solids and the pressure in the recycle chamber. The derived relationships were in good agreement with the measured data.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Jemin Son, Hyeseon Lee, Taek Lee, Hiesang Sohn, Si Jae Park, Jeong-Geol Na, Sang Woo Seo, Jeong Wook Lee, Hah Young Yoo, Chulhwan Park
Summary: This study demonstrated the enzymatic conversion of M3HB from methanol and beta-hydroxybutyric acid (BHB) through lipase-catalyzed esterification, achieving a conversion rate of 94.6%. The developed lipase-based synthesis method for M3HB holds potential for future applications in the bioindustry.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Physical
Seok Hwan Yang, Wonsang Jung, Hyeonggeon Lee, Sang-Hun Shin, Seung Jae Lee, Min Suc Cha, Woong Choi, Seong-Geun Oh, Ki Bong Lee, Ung Lee, Da Hye Won, Jang Yong Lee
Summary: This study demonstrates the key roles of HQPC-tmIM, a polycarbazole-based anion-conducting material, in electrochemical CO2 reduction (eCO2R) and reveals its commercial viability as an anion exchange membrane (AEM). The superior performance of HQPC-tmIM in terms of mechanical/chemical stability and CO partial current density (jCO) in a membrane electrode assembly electrolyzer (MEA) was shown compared to a commercial AEM (Sustainion). The multiphysics model simulation reveals that the well-constructed membrane morphology of HQPC-tmIM enables high jCO through facilitated charge transfer.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Suji Kim, Hyung Jin Yoon, Chan Hyun Lee, Ki Bong Lee
Summary: CO2 capture using solid-based adsorbents at high temperatures, particularly hydrotalcite with a high Mg/Al molar ratio, holds promise for addressing global warming and climate change. The melting behavior of NaNO3 at different temperatures affects CO2 sorption kinetics and uptake.
JOURNAL OF CO2 UTILIZATION
(2023)