Article
Chemistry, Physical
Zitao Lin, Pengwei Ren, Riguang Zhu, Xingying Tang, Youchang Zheng, Tiantian Xu, Yinghui Wang, Jianqiao Yang, Jianjun Cai
Summary: The early formation of phosphate oxide formed on different alloys exposed in supercritical water was investigated. The severe spallation of phosphate corrosion products was observed on austenitic stainless steel. Stable phosphate oxide films tended to form on Alloy 625. TiO2 and Ti2O3 were the main components of oxide films on TA8. Synergistic effect between phosphates, oxygen, and supercritical water resulted in severe corrosion. The corrosion behavior of the alloys at different locations in the reaction tube was compared. Detailed molten corrosion mechanism of the alloys after exposure to supercritical water was discussed.
Article
Chemistry, Physical
Jianqiao Yang, Shuzhong Wang, Jiahuan Wang, Jinlong Wang, Baoquan Zhang, Lu Liu, Wei Liu, Yanhui Li, Donghai Xu
Summary: This study conducted erosion-corrosion experiments on Ni based alloys in a high-temperature and high-pressure supercritical water environment. It was found that the erosion process does not change the basic corrosion mechanism, but it does affect the oxidation rates of the alloys. The inner oxide layer formed during the corrosion process remains and acts as a barrier against further corrosion.
JOURNAL OF SUPERCRITICAL FLUIDS
(2022)
Article
Electrochemistry
Xu Zhou, Chuanhua Liao, Yinfeng Wang, Yuezhao Zhu
Summary: The first Pourbaix diagrams of the Fe-Cl--H2O ternary system under supercritical water conditions were established in this study to predict the evolution process of metals in thermodynamics equilibrium. Results showed that with the increase of chloride concentration, the FeCl3 (aq) corrosion zone eroded the hematite and magnetite passivation film and ferrous iron, while the range of the immunization zone remained almost unchanged.
ELECTROCHIMICA ACTA
(2021)
Article
Chemistry, Physical
Jianqiao Yang, Jiyuan Sun, Shuyuan Bai, Hao Wu, Shuzhong Wang, Yanhui Li, Wenhao Ma, Donghai Xu
Summary: The study found that the stability of the Cr coating in supercritical water oxidation environment is influenced by the oxygen concentration, with higher concentrations leading to poorer stability of the Cr2O3 layer.
JOURNAL OF SUPERCRITICAL FLUIDS
(2022)
Article
Materials Science, Multidisciplinary
Yong Gui, Zhiyuan Liang, Shuo Wang, Qinxin Zhao
Summary: The effect of stress on the corrosion behavior and mechanical properties of T91 tube exposed to high-temperature supercritical carbon dioxide (S-CO2) was studied. The results showed that the yield strength, ultimate tensile strength, and elongation of T91 tube decreased after exposure to S-CO2. In addition, a significant amount of carbide precipitates were observed in the Fe-Cr-rich corrosion layer of T91 tube, which was attributed to the increased ion diffusion and carburizing rate under stress. Consequently, the corrosion rate of T91 tube was significantly faster than that of T91 coupon.
Article
Materials Science, Multidisciplinary
L. Teeter, B. Adam, T. Wood, J. D. Tucker
Summary: The corrosion resistance of structural alloys under different environments was studied, revealing that alloys exposed to sCO(2) were more aggressive in corrosion and exhibited signs of recrystallization.
Article
Materials Science, Coatings & Films
Yumiao Ding, Shuguang Liu, Chaoqun Xia, Xianrui Zou, Di Liu, Yanqing Wang, Tai Yang, Qiang Li
Summary: Thermal oxidation treatment of novel 47Zr-45Ti-5Al-3 V alloy at 600 degrees C for different durations resulted in improved corrosion resistance and pitting resistance compared to the substrate. The oxidation film properties and corrosion behavior of the samples were studied, showing enhanced performance after thermal oxidation. Thermodynamics and kinetics of the process were analyzed through Gibbs free energy calculations and oxidation weight gain tests.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Monika Sipova, Daniela Marusakova, Claudia Aparicio, Jan Prochazka, Patricie Halodova
Summary: Austenitic stainless steel 08Cr18Ni10Ti is widely used in WWER reactor and considered as a prospective material for supercritical water-cooled reactors. This study investigated the corrosion behavior of the steel in close proximity to the critical point of water and at high temperatures of supercritical water. The results showed the formation of a thin oxide layer in water close to the supercritical point, while localized corrosion was observed in high temperature supercritical water.
Article
Engineering, Environmental
Yanhui Li, Shuzhong Wang, Tongtong Xu, Jianna Li, Yishu Zhang, Tiantian Xu, Jianqiao Yang
Summary: Through theoretical and experimental investigations, this study identified the root causes and solutions to key challenges in the SCWO process, such as high corrosion risks and blockage issues, and proposed a set of optimized parameters and a novel SCWO process with corresponding control scheme. This research sheds light on enhancing the safety and reliability of SCWO processes for efficient treatment of petrochemical sludge while minimizing environmental impacts.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Nanoscience & Nanotechnology
Kai Chen, Lefu Zhang, Shengchuan Wu, Zhao Shen
Summary: The study found that 19Cr alloy and 25Cr alloy undergo internal oxidation and external oxidation, respectively, after exposure in supercritical water. The higher Cr content in 25Cr alloy leads to the formation of a thinner protective Cr2O3 layer, effectively protecting the sub-surface from further oxidation.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Yong Gui, Qinxin Zhao, Shuo Wang, Zhiyuan Liang
Summary: The contribution of shot-peening treatment on the corrosion resistance of Sanicro 25 to supercritical carbon dioxide was investigated. The treatment resulted in thicker corrosion layers and accelerated the formation of carbide-containing precipitates. Shot-peened Sanicro 25 exhibited increased voids and stress concentration, leading to scale spallation after exposure.
Review
Materials Science, Multidisciplinary
Kaiyang Li, Zhongliang Zhu, Bo Xiao, Jing-Li Luo, Naiqiang Zhang
Summary: The supercritical CO2 (S-CO2) Brayton cycle is highly efficient and has a simple layout and compact turbomachinery, making it a popular choice in the field of thermal cycles. However, the corrosion-related degradation of constructional materials still limits its broad applications. This comprehensive review examines the corrosion behavior of alloys in S-CO2 environments, analyzing the effects of temperature, pressure, impurity, alloying elements & structure, sample thickness, welding, coating, and surface treatments on corrosion. Additionally, stress-assisted corrosion, including tensile behavior, creep, stress corrosion cracking, fatigue, and thermal cycling, is thoroughly discussed.
PROGRESS IN MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Kai Zhang, Li Xin, Tianyu Ma, Hao Chang, Yiliang Lu, Changjie Feng, Shenglong Zhu, Fuhui Wang
Summary: The long-term oxidation behavior of TiAlSiN coated TiAl alloys at high temperatures was investigated in this study. The results showed that the oxide layer formed on the coated surface exhibited excellent protective performance, contributing to the enhanced oxidation resistance of the alloys.
Article
Materials Science, Multidisciplinary
Aurelia Elena Tudose, Ioana Demetrescu, Florentina Golgovici, Manuela Fulger
Summary: The study investigated the corrosion behavior of 310H stainless steel in water at a supercritical temperature, revealing that oxidation led to weight gain and the oxide layer exhibited a growing tendency over time. Electrochemical analysis showed that Cr and (Fe, Mn) Cr2O4 oxides had the best corrosion resistance after 2160 hours of oxidation.
Article
Engineering, Environmental
David R. Griffith, MacKayla Carolan, Manuel Marcos Gutierrez, Anya Romig, Nathan Garcia-Diaz, Carolyn P. Hutchinson, Rosa Leoin Zayas
Summary: Halogenated estrogens are removed from natural waters more quickly by sunlight exposure than biodegradation, which has implications for wastewater treatment technologies and mitigating risks to aquatic systems.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Seongmin Jin, Hyukjun Byun, Chang-Ha Lee
Summary: Tuning the properties of metal oxides is crucial for enhancing the activity of metal oxide-supported catalysts. By introducing abundant defects into MgO, its limited reducibility can be overcome, leading to increased catalytic activity. Increasing the MgO content and temperature significantly promotes the reconstruction of active surface oxygen, demonstrating the feasibility of using nonreducible MgO as an active support for reactions where redox properties are important.
JOURNAL OF CATALYSIS
(2021)
Article
Thermodynamics
Atefeh Rezaei, Peyman Pakzad, Masoud Mofarahi, Amir Abbas Izadpanah, Morteza Afkhamipour, Chang-Ha Lee
Summary: The densities and viscosities of three solutions were measured and various volumetric and viscometric characteristics were calculated to explain the experimental results. The properties were analyzed through intermolecular interactions and molecular structures to determine the viscous flows of the solutions. The obtained thermodynamic properties can be utilized in the design and optimization of a CO2-capture process.
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2021)
Article
Chemistry, Multidisciplinary
Dong-Hoon Oh, Chang-Ha Lee, Jae-Cheol Lee
Summary: This study designed four alternative NGCC-based process schemes and found that NGCC-CLC processes could produce higher net power than NGCC-MEA. Among them, NGCC-CLC with excess air and steam turbine integration was considered as the most efficient process scheme for generating power from natural gas.
Article
Materials Science, Paper & Wood
Eugene Huh, Ji-Hyun Yang, Chang-Ha Lee, Ik-Sung Ahn, Byung Jin Mhin
Summary: The 3D-RISM-KH theory combined with KBI was used to study the role of alkali metal hydroxides in cellulose solvation. The results showed that Li+ hydrates had the closest interaction with cellulose due to their high charge density, explaining the difference in cellulose solubilities in different aqueous solutions.
Review
Thermodynamics
Kwang-Jun Ko, Hyokyung Kim, Young-Ho Cho, Haeryeong Lee, Kyung-Min Kim, Chang-Ha Lee
Summary: This review summarizes the CO adsorption performances of various adsorbents, discusses their physical and chemical properties, CO selectivities, and compares the effects of Cu+ impregnation on CO adsorption. The data and analysis provided in this review can contribute to the development of novel adsorbents and processes for CO removal and production.
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2022)
Article
Chemistry, Analytical
Maengkyo Oh, Keunyoung Lee, Kwang-Wook Kim, Richard Foster, Chang-Ha Lee
Summary: The applicability of uranium peroxide precipitation method for removing uranium from secondary wastewaters has been studied. Optimized conditions were applied to achieve high removal efficiency within a short time. The method also removed other impurities and met the criteria for secondary wastewater discharge.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2022)
Article
Energy & Fuels
Khayyam Mehrabi, Ali Bakhtyari, Masoud Mofarahi, Chang-Ha Lee
Summary: This study develops a simple and accurate density calculation model for amino acid salt solutions (AASs) and evaluates it using artificial neural networks (ANNs). The results show that the developed correlation has excellent performance in predicting the densities of AASs, and ANNs can accurately calculate the densities.
Article
Chemistry, Applied
Kyounghee Chung, Dooyong Park, Kyung-Min Kim, Chang-Ha Lee
Summary: This study establishes the design basis for the cyclic adsorption process of ethylene purification by measuring the adsorption equilibria and kinetics of ethane and ethylene on zeolite 13X pellets. The strong cation-pi interaction between ethylene and Na+ in zeolite 13X leads to higher adsorption capacity and affinity for ethylene. Additionally, macropore diffusional resistance also contributes to the adsorption kinetics.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Review
Thermodynamics
Seo Ryung Jeong, Jung Hyeok Park, Jun Hyeong Lee, Pil Rip Jeon, Chang-Ha Lee
Summary: This study reviews the adsorption of CO2, CH4, and their mixture on coals and shales, and discusses the properties of coals and shales that influence adsorption. The heterogeneous properties of coals and shales make it difficult to develop prediction models, but the use of machine learning models and the combination of thermodynamic models and machine learning models show potential for creating a universal prediction model for CO2/CH4 adsorption on various types of coals and shales.
FLUID PHASE EQUILIBRIA
(2023)
Article
Engineering, Environmental
Hyokyung Kim, Kwang-Jun Ko, Masoud Mofarahi, Kyung-Min Kim, Chang-Ha Lee
Summary: This study elucidates the adsorption characteristics of low-concentration tetrahydrothiophene (THT) and tert-butyl mercaptan (TBM) in CH4 on Cu-impregnated activated carbon (Cu/AC). THT removal is dominated by physical adsorption, allowing facile regeneration by N2 thermal treatment. TBM removal is primarily carried out by chemical adsorption utilizing CuO, Cu2O, and oxygen on the AC.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Zhiwei Zhang, Dong-Hoon Oh, Vo Dat Nguyen, Chang-Ha Lee, Jae-Cheol Lee
Summary: This study developed NGCC power plants integrated with CCU and compared them with a conventional NGCC power plant with postcombustion carbon capture. Case 2 showed the lowest CO2 emissions and Case 3 had the highest electricity generation due to lower CO2 utilization pressure. The economic analysis showed that Case 3 had the best performance in terms of capital and operating expenditures and annual revenue.
Article
Engineering, Environmental
Zhiwei Zhang, Dat-Nguyen Vo, Jaesung Kum, Suk-Hoon Hong, Chang-Ha Lee
Summary: This study aims to improve the energy efficiency of a monoethanolamine (MEA)-based CO2 capture process by developing advanced process modules that utilize low-grade waste heat. Cascade modules were found to have outstanding energy-saving performance, with an average improvement of 50% over single modules. Economic analysis showed that the advanced process modules were economically feasible, with a savings-to-investment ratio exceeding 1. The cascade module for direct heat supply was identified as the most appropriate option in terms of both economic viability and energy-saving efficiency in amine-based CO2 capture processes, particularly at a higher equivalence factor (EF).
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Dat-Nguyen Vo, Jae Hun Chang, Suk-Hoon Hong, Chang-Ha Lee
Summary: In this study, a novel configuration of a three-bed temperature swing adsorption (TSA) process using zeolite 4A and machine learning-based optimization was developed for effective NH3 removal. The proposed configuration performed the best in a techno-economic comparison and consumed a small amount of cost for NH3 removal.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Vo Dat Nguyen, JaeHun Chang, Suk-Hoon Hong, Chang-Ha Lee
Summary: An advanced CTM process was developed to produce high-purity methanol from a wet CO2 source. By optimizing process parameters, the methanol yield and CO2 reduction can be increased while the production cost is decreased.
Article
Green & Sustainable Science & Technology
Rakyoung Jeon, Shin Hyuk Kim, Kwangjun Ko, Kihyun Kwon, Myungkyu Park, Ireh Seo, Min Oh, Chang-Ha Lee
Summary: This study evaluated the performance of three newly designed cartridges for next-generation gas respirators. Through flow analysis and breakthrough experiments, the researchers assessed the adsorption kinetics and computational fluid dynamics (CFD) of the cartridges. The study found that virtual engineering can be utilized to improve CFD simulation and optimize cartridge design.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Physical
P. Belmonte, J. M. Garcia-Vargas, J. F. Rodriguez, I. Garrido, M. T. Garcia, M. J. Ramos
Summary: In this study, four polythiourethane films with different types of polyols and isocyanates were synthesized, characterized, and foamed. The results showed that the type of isocyanate greatly influenced the crystallinity and stiffness of the polymers, while the type of polyol modified the FT-IR spectra and the decomposition curve of the material with temperature. Furthermore, the choice of isocyanate also affected the properties of the foams obtained from the polymeric material.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Xutao Zhu, Jianguo Yan, Shouchun Liu, Fengling Zhu
Summary: This study experimentally assessed the hydrodynamic characteristics of supercritical-pressure R134a in a horizontal circular tube. It was found that the hydrodynamic characteristic curve of R134a under supercritical pressure does not have a negative-slope region but a transition region. The transition region becomes more evident with increasing heat flux, while it weakens with increasing pressure and inlet temperature. Moreover, the onset of the transition region shifts in the direction of high mass flow rate with increasing heat flux.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Stefania Mottola, Iolanda De Marco
Summary: In this study, corticosteroids were micronized with cyclodextrin using Supercritical Assisted Atomization (SAA), resulting in spherical micrometric particles with improved dissolution time.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Honghai Liu, Yu Xie, Zhilan Li, Xiaokai Zhang
Summary: This study compared the effects of supercritical carbon dioxide dewatering (SCD) and conventional kiln drying (CKD) at a temperature of 55 degrees C on the dewatering rate, moisture transfer and distribution, shrinkage, and stress characteristics of bamboo strips. The results showed that SCD had a faster dewatering rate and lower shrinkage compared to CKD, but was less effective in reducing drying stress in bamboo.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Tahmasb Hatami, Ozan N. Ciftci
Summary: This study fills the gap in previous research by establishing a hierarchy of significance for factors affecting SFE profitability, providing a deeper understanding of how technical and economic factors impact profitability. The findings highlight that the SFE facility becomes profitable when the extractor capacity surpasses 42 L.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Tingshan Guo, Chuang He, Zhiyuan Liang, Qinxin Zhao
Summary: The initial oxidation behavior of Fe10Cr and Fe20Cr alloys in supercritical H2O and supercritical CO2 with O2 has been investigated. The results show that O2 has the highest adsorption energy on FeCr alloys and reacts faster than H2O and CO2.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Vikash Chandra Roy, Jin-Seok Park, Ahmed Redwan Haque, Md Sadek Ali, Hee-Jeong Lee, Byung-Soo Chun
Summary: This research aimed to valorize brewery spent grain (BSG) using subcritical water hydrolysis (SWH) modified by six different natural deep eutectic solvents (DES) and determining their bipotentialities. The findings showed that BSG hydrolysates obtained through DES-induced SWH contained high levels of sugars, proteins, flavonoids, phenolic compounds, and essential amino acids. The hydrolysates also demonstrated antimicrobial activities, and the presence of bioactive compounds was confirmed through FT-IR analysis. This comprehensive profiling of bioactive compounds from BSG using DES-mediated SWH can contribute to the efficient valorization of BSG for industrial purposes.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Kailiang Zhang, Hanyu Wang, Tong Liu, Zhu Wang, Lvxing Wang, Ping Fan, Feng Chen, Mingqiang Zhong, Bozhen Wu, Shanqiu Liu, Jintao Yang
Summary: This study investigates the influence of foam cell structure on the electromagnetic interference shielding performance of conductive polymer composite foam. The results suggest that foamed composites exhibit improved EMI shielding performance, and bimodal cell foams have higher electric conductivity but lower EMI shielding compared to uniform cell foams.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Jaromir Valtr, Petr Roztocil, David Dasek, Radek Musalek, Frantisek Lukac, Jakub Klecka, Marek Janata, Mariana Arnoult-Ruzickova, Eva Mistova, Ludek Jelinek, Petr Sajdl, Jan Macak
Summary: This paper focuses on the design of an experimental facility for in-situ electrochemical testing at supercritical water conditions, including the design of the electrode system and surface insulation coating for electrode leads.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Richard Djimasbe, Mikhail A. Varfolomeev, Nailya M. Khasanova, Ameen A. Al-Muntaser, Rustam R. Davletshin, Muneer A. Suwaid, Gazinur Z. Mingazov
Summary: This study confirms the capability of supercritical water to generate active hydrogen that interacts with different fractions in unconventional feedstocks, leading to synthetic oil production during hydrothermal reactions. The findings suggest that a maximum yield of 16.78% can be achieved at a temperature of 380 oC and a reaction time of 1-12 hours.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
