Article
Energy & Fuels
Yingmei Wang, Aili Niu, Wenze Jiao, Ji Chen, Peng Zhang, Jinping Li
Summary: Carbon dioxide hydrate formation rate is improved by using different accelerator systems. The combination of nanographite-TBAB and SDS-TBAB shows better performance in reducing the nucleation time. TBAB shows the best nucleation amount, formation rate, and conversion rate among the single acceleration systems.
Article
Thermodynamics
Jose M. Chima-Maceda, Alfredo Pimentel-Rodas, Luis A. Galicia-Luna, Angel M. Notario-Lopez
Summary: Experimental measurements of hydrate dissociation conditions were conducted for three multi-component systems, with good agreement found between the experimental data and literature data, indicating the viability of the experimental technique. The uncertainties in temperature and pressure were determined to be 0.16 K and 0.04 MPa, respectively, with a relative standard uncertainty in composition estimated to be 0.0014.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2021)
Article
Energy & Fuels
Yu Wei, Qimeng Yang, Xuehua Zhang, Nobuo Maeda
Summary: This study investigated the shear strength of THF hydrate on substrates with different hydrophobicity and the impact of PVP. The results showed a decrease in critical shear stress with heating and an increase with the addition of PVP. Interestingly, the hydrates exhibited higher adhesive strength on hydrophobic substrates compared to hydrophilic ones.
Article
Thermodynamics
Xiaoya Zang, Jing Wang, Yong He, Xuebing Zhou, Deqing Liang
Summary: In this study, TBAB hydrates were synthesized and their carbon capture capacity from a ternary gas mixture of CH4/CO2/N-2 was investigated. The addition of TBAB increased the specific surface area of the hydrate crystals and transformed the hydrate structure. These findings are important for the development of hydrate gas separation technology.
Article
Engineering, Chemical
Bin-Bin Ge, Jin Yan, Dong-Liang Zhong, Yi-Yu Lu, Xi-Yue Li
Summary: CO2 capture was experimentally investigated by forming TBAB semiclathrate in a new system of TBAB + graphite nanofluids. The system of TBAB + graphite nanofluids showed preference for CO2 capture compared to TBAB solution and TBAB + SDS solution. The optimal concentration of 0.2 wt.% graphite nanoparticles was found to enhance hydrate growth in TBAB + graphite nanofluids.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Xi-Yue Li, Jin Yan, Dong-Liang Zhong, Shi-Jian Lu, Bin-Bin Ge
Summary: This study investigated the formation of tetra-n-butyl ammonium bromide (TBAB) semiclathrate hydrate for CO2 capture through experiments and in situ Raman spectroscopy. The impacts of TBAB concentration and operating temperature on CO2 incorporation into TBAB semiclathrates were analyzed. The results showed that the structure transition of TBAB semiclathrates from type A to type B occurred in the presence of CO2, resulting in increased CO2 consumption. The TBAB semiclathrate formed at 2.57 mol % TBAB and 282.15 K was found to be a suitable system for CO2 capture.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Thermodynamics
Rod Burgass, Antonin Chapoy
Summary: This paper presents experimental equipment, methods and new results for the water content of carbon dioxide and impure carbon dioxide in equilibrium with hydrates. The experimental data are compared with predictions from two thermodynamic models, showing that the hydrate-forming conditions are modelled by the solid solution theory of van der Waals and Platteeuw.
FLUID PHASE EQUILIBRIA
(2023)
Article
Engineering, Environmental
Yuechao Zhao, Xu Lei, Jia-nan Zheng, Ming Li, Michael L. Johns, Mingxing Huang, Yongchen Song
Summary: Gas hydrates are considered promising for gas storage, energy transportation, and seawater desalination. Using MRI, researchers were able to non-invasively image the formation of opaque hydrates from CO2 and water in a cylindrical vessel at low temperature and high pressure. They observed dense hydrate layers forming consistently at the gas-water interface, porous hydrate layers above it, and complex dendritic formations in the water phase below.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Fariba Asadi, Peter J. Metaxas, Vincent W. S. Lim, Tuan A. H. Nguyen, Zachary M. Aman, Eric F. May, Anh Nguyen
Summary: Gas hydrates offer potential methods for the storage and transportation of gases, but factors such as slow kinetics can hinder their applications. This study demonstrates the use of cyclodextrins (CDs) as green chemicals to accelerate methane hydrate formation. Nucleation rates were increased for all three studied CDs, suggesting a potential role of disruption in H-bonding at the gas-water interface in hydrate nucleation promotion in CD-containing systems.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
M. Fahed Qureshi, Vikas Dhamu, Adam Usadi, Timothy A. Barckholtz, Ashish B. Mhadeshwar, Praveen Linga
Summary: Carbon capture and sequestration is a critical method to reduce carbon footprint and achieve net-zero carbon emissions. This study examines the kinetics of CO2 hydrate formation using liquid CO2 and a green kinetic promoter, and presents a mathematical model for quantifying hydrate formation kinetics. The results show that the green kinetic promoter enhances the overall water to hydrate conversion and reduces the formation process time.
Article
Energy & Fuels
Bjorn Kvamme
Summary: This study investigates the difference in stability between CO2 and CH4 hydrates and the effect of adding N-2 gas on the thermodynamic properties of the system. The results show that the Gibbs free energy of CO2 hydrate formed from average seawater is slightly lower than that of CH4 hydrate. The stability of hydrates decreases with increasing salinity, but the difference in stability between the injection gas and CH4 hydrate remains almost the same.
Article
Green & Sustainable Science & Technology
Amin Hosseini Zadeh, Ijung Kim, Seunghee Kim
Summary: Hydrate-based CO2 sequestration (HBCS) is a new method to store large amounts of CO2 in geological sediments as crystalline solids. This study investigates the characteristics and kinetics of CO2 hydrate formation and dissociation under different conditions. The results suggest that hydrate nucleation and growth are limited in a porous medium due to solid particles, limited CO2 mass transfer, and heat transfer. Limited CO2 diffusion, hydrate nucleation, and better protection of hydrates are key factors for successful formation in the porous medium.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2023)
Article
Multidisciplinary Sciences
Shubhangi Srivastava, Ann Mary Kollemparembil, Viktoria Zettel, Timo Classen, Bernhard Gatternig, Antonio Delgado, Bernd Hitzmann
Summary: The dissociation of CO2 gas hydrates with amino acid and surfactant promoters was studied, and it was found that leucine and lecithin are effective promoters for enhancing CO2 uptake and stability in gas hydrate formation.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Multidisciplinary
Takuma Misawa, Tomoaki Ishikawa, Satoshi Takeya, Saman Alavi, Ryo Ohmura
Summary: CO2 separation from H2 + CO2 gas mixture is essential for stable supply of blue hydrogen, and hydrate-based CO2 separation is a superior technology in terms of environmental and economic aspects. The study showed successful CO2 separation in the H2 + CO2 + CP + H2O system at 284 K, but with an increase in energy costs due to hydrogen loss.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Engineering, Environmental
Yi Lu, Hui Wang, Qingping Li, Xin Lv, Yang Ge, Lunxiang Zhang, Jiafei Zhao, Lei Yang, Yongchen Song
Summary: This study validates the feasibility of hydrate-based gas storage method for low-concentration flue gas through molecular dynamics simulations. The results show that proper subcooling can improve the hydrate growth rate and the occupancy of CO2 molecules in newly formed hydrate cages.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Ngoc N. Nguyen, Vinh T. La, Chinh D. Huynh, Anh Nguyen
Summary: Carbon capture and storage (CCS) is crucial for reducing CO2 emissions and achieving climate change targets. Hydrate-based carbon capture (HBCC) is a promising and potentially competitive method, but slow kinetics and limited industrial experience present challenges for deployment.
Review
Energy & Fuels
Ngoc N. Nguyen
Summary: Hydrogen hydrate is a promising material for safe and cost-effective hydrogen storage, but achieving high hydrogen storage capacity and overcoming slow kinetics remain as challenges for commercializing this technology. Future research is needed to address these gaps and technological barriers for the realization of hydrogen hydrate-based hydrogen storage.
Article
Chemistry, Physical
Kangkang Sun, Cuong V. Nguyen, Ngoc N. Nguyen, Xiaozhen Ma, Anh V. Nguyen
Summary: Flotation of water-soluble KCl and NaCl minerals in brines is significant for K-fertilizer production, but its mechanism remains controversial. This study investigates the interaction between dissolved salt ions and collector colloids, as well as the changes in interfacial properties, to gain a molecular understanding of salt flotation. The findings suggest that ion specificity plays a crucial role in salt crystal flotation via collector colloid-crystal attraction.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Review
Engineering, Environmental
Ngoc N. Nguyen, Anh V. Nguyen
Summary: Gas hydrates present both opportunities and threats, and chemical additives are used to promote or inhibit hydrate formation. However, recent studies have shown that some known hydrate promoters can act as inhibitors, and vice versa, when their concentrations change. The dual nature of hydrate additives has not been thoroughly discussed in the literature.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Thao T. P. Nguyen, Foad Raji, Cuong V. Nguyen, Ngoc N. Nguyen, Anh V. Nguyen
Summary: Surfactants play a crucial role in controlling the macroscopic properties of the air-water interface. This study investigates the connection between the molecular structure of two ionic surfactants (DTAB and SDS) and their effects on the interfacial water molecules. The findings reveal that the different interactions and reorientations of water molecules result in variations in interfacial layer thickness, surface tension, and foam stability.
Article
Thermodynamics
Jiyue Sun, Lei Jiang, I. Ming Chou, Ngoc N. Nguyen, Anh V. Nguyen, Ying Chen, Juezhi Lin, Chuanjun Wu
Summary: This study investigated the thermodynamics and kinetics of methane hydrate formation in the presence of cetyltrimethylammonium bromide (CTAB) solutions. The cage occupancy and hydration number of the hydrates were determined, showing a range of 3.1-3.6 and 5.9-6.1, respectively. CTAB was found to have no impact on the phase equilibria of methane hydrate, and the kinetic rate constants for different CTAB solutions were also determined. Additionally, large-scale reactor experiments demonstrated the ability of CTAB to promote hydrate formation.
Article
Chemistry, Physical
Foad Raji, Cuong V. Nguyen, Ngoc N. Nguyen, Tuan A. H. Nguyen, Anh Nguyen
Summary: The hypothesis states that adsorption of divalent heavy metal ions at the mineral-water interfaces leads to changes in interfacial chemical species and charges, interfacial water structure, Stern and diffuse layers. This study used sum-frequency generation spectroscopy to probe the changes in vibrational resonances of interfacial OH as a response to DHMI concentration and pH. The findings revealed three surface charge reversals at different pH levels, indicating significant alterations in the structure of interfacial waters.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Environmental Sciences
Andrew Doi, Tuan A. H. Nguyen, Ngoc N. Nguyen, Cuong Nguyen, Foad Raji, Anh Nguyen
Summary: Mineral tailings dams pose pollution risks and catastrophic failures. Dry stacking offers a promising alternative, but research outcomes are lacking. Different dewatering methods and chemical aids were used to produce semi-solid cakes from coal tailings slurries. The handleability and disposability of these cakes were influenced by polymer flocculant selection, mechanical dewatering technique, clay mineralogy, and residue moisture. Increasing solid concentration led to increased yield stress and stiff growth. Polymer flocculants increased shear strength, but the selection requires trade-offs between disposability and handleability. Cationic and anionic PAM were found suitable for different dewatering methods.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Chemical
Xiaozhen Ma, Ngoc N. Nguyen, Anh V. Nguyen
Summary: A model was developed to quantify the stability and detachment of particles from the particle-laden surface in flotation. The numerical results were used to develop a semi-empirical model for engineering calculations and assessment. This model successfully quantified the particle stability and detachment from the laden surface, which is of great significance for flotation processes.
MINERALS ENGINEERING
(2023)
Article
Engineering, Chemical
Tariqul Islam, Anh Nguyen
Summary: Fluidization is effective in improving the separation of coarse particles. In this study, three-dimensional computational fluid dynamics (CFD) modeling is used to investigate the complex behavior of irregular coarse particle fluidization in a fluidized bed flotation cell. A modified drag model considering the particle shape factor is employed to account for the irregularity of the particles. Comparison between simulated and experimental data shows that the irregular particle drag model has a relative error of 3.9%, which is significantly better than the spherical particle drag model. The CFD model further reveals the effects of particle density and fluidization liquid velocity on bed expansion height. The fluidization behaviors of the particles in different zones of the fluidized bed flotation cell are analyzed, providing valuable insights for the flotation of coarse particles in fluidized beds.
MINERALS ENGINEERING
(2023)
Article
Engineering, Chemical
Quang D. Dao, Thuong V. Nguyen, David M. A. T. Nguyen, Ngoc N. Nguyen, Cuong V. Nguyen, Anh V. Nguyen
Summary: A new technique using X-ray computed tomography (XCT) scanning was developed and applied to describe the partition curve of a dense medium cyclone (DMC) at a lead-zinc mineral processing plant in Australia. Detailed information on individual particles such as volume, surface area, mass, and density was obtained through XCT analysis, and cumulative mass distribution curves and partition curves for different size classes of the DMC were constructed. The XCT technology overcomes the issues of traditional float-and-sink (FaS) analysis and enables continuous, online, and real-time monitoring and control of DMC separation efficiency.
MINERALS ENGINEERING
(2023)
Article
Engineering, Chemical
Xiaozhen Ma, Ngoc N. Nguyen, Anh Nguyen, Jan D. Miller
Summary: This study successfully determines the relationship between mineral floatability, mineral surface exposure, and hydrophobicity through advanced experimental techniques and modeling. High-resolution X-ray microcomputed tomography (HRXMT) was used to determine the surface exposure of composite mineral particles, and it was compared with the mineral floatability obtained from film flotation experiments and the contact angle (CA) of the mineral particles.
MINERALS ENGINEERING
(2023)
Article
Engineering, Environmental
Foad Raji, Cuong V. Nguyen, Anh V. Nguyen
Summary: A new model was proposed in this study to accurately describe the adsorption of heavy metal ions on quartz surfaces and explain the surface charge reversal phenomenon. The model combines the electrical double layer theory and surface complexation and precipitation theory, and can predict the surface potential and charge reversal under different conditions. By studying the Pb(II)-quartz system, it was found that Pb(II) hydroxocomplexes played a key role in the appearance of the second surface charge reversal.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Energy & Fuels
Yingna Du, Chen Huang, Wei Jiang, Qiangwei Yan, Yongfei Li, Gang Chen
Summary: In this study, anionic surfactants modified hydrotalcite was used as a flow improver for crude oil under low-temperature conditions. The modified hydrotalcite showed a significant viscosity reduction effect on crude oil. The mechanism of the modified hydrotalcite on viscosity and pour point of crude oil was explored through characterization and analysis of the modified hydrotalcite and oil samples.
Article
Energy & Fuels
Mohammad Saeid Rostami, Mohammad Mehdi Khodaei
Summary: In this study, a hybrid structure, MIL-53(Al)@MWCNT, was synthesized by combining MIL-53(Al) particles and -COOH functionalized multi-walled carbon nanotube (MWCNT). The hybrid structure was then embedded in a polyethersulfone (PES) polymer matrix to prepare a mixed matrix membrane (MMM) for CO2/CH4 and CO2/N2 separation. The addition of MWCNTs prevented MIL-53(Al) aggregation, improved membrane mechanical properties, and enhanced gas separation efficiency.
Article
Energy & Fuels
Yunlong Li, Desheng Huang, Xiaomeng Dong, Daoyong Yang
Summary: This study develops theoretical and experimental techniques to determine the phase behavior and physical properties of DME/flue gas/water/heavy oil systems. Eight constant composition expansion (CCE) tests are conducted to obtain new experimental data. A thermodynamic model is used to accurately predict saturation pressure and swelling factors, as well as the phase boundaries of N2/heavy oil systems and DME/CO2/heavy oil systems, with high accuracy.
Article
Energy & Fuels
Morteza Afkhamipour, Ebad Seifi, Arash Esmaeili, Mohammad Shamsi, Tohid N. Borhani
Summary: Non-conventional amines are being researched worldwide to overcome the limitations of traditional amines like MEA and MDEA. Adequate process and thermodynamic models are crucial for understanding the applicability and performance of these amines in CO2 absorption, but studies on process modeling for these amines are limited. This study used rate-based modeling and Deshmukh-Mather method to model CO2 absorption by DETA solution in a packed column, validated the model with experimental data, and conducted a sensitivity analysis of mass transfer correlations. The study also compared the CO2 absorption efficiency of DETA solution with an ionic solvent [bmim]-[PF6] and highlighted the importance of finding optimum operational parameters for maximum absorption efficiency.
Article
Energy & Fuels
Arastoo Abdi, Mohamad Awarke, M. Reza Malayeri, Masoud Riazi
Summary: The utilization of smart water in EOR operations has gained attention, but more research is needed to understand the complex mechanisms involved. This study investigated the interfacial tension between smart water and crude oil, considering factors such as salt, pH, asphaltene type, and aged smart water. The results revealed that the hydration of ions in smart water plays a key role in its efficacy, with acidic and basic asphaltene acting as intrinsic surfactants. The pH also influenced the interfacial tension, and the aged smart water's interaction with crude oil depended on asphaltene type, salt, and salinity.
Article
Energy & Fuels
Dongao Zhu, Kun Zhu, Lixian Xu, Haiyan Huang, Jing He, Wenshuai Zhu, Huaming Li, Wei Jiang
Summary: In this study, cobalt-based metal-organic frameworks (Co-based MOFs) were used as supports and co-catalysts to confine the NHPI catalyst, solving the leaching issue. The NHPI@Co-MOF with carboxyl groups exhibited stronger acidity and facilitated the generation of active oxygen radicals O2•, resulting in enhanced catalytic activity. This research provides valuable insights into the selection of suitable organic linkers and broadens the research horizon of MOF hybrids in efficient oxidative desulfurization (ODS) applications.
Article
Energy & Fuels
Edwin G. Hoyos, Gloria Amo-Duodu, U. Gulsum Kiral, Laura Vargas-Estrada, Raquel Lebrero, Rail Munoz
Summary: This study investigated the impact of carbon-coated zero-valent nanoparticle concentration on photosynthetic biogas upgrading. The addition of nanoparticles significantly increased microalgae productivity and enhanced nitrogen and phosphorus assimilation. The presence of nanoparticles also improved the quality of biomethane produced.
Article
Energy & Fuels
Yao Xiao, Asma Leghari, Linfeng Liu, Fangchao Yu, Ming Gao, Lu Ding, Yu Yang, Xueli Chen, Xiaoyu Yan, Fuchen Wang
Summary: Iron is added as a flocculant in wastewater treatment and the hydrothermal carbonization (HTC) of sludge produces wastewater containing Fe. This study investigates the effect of aqueous phase (AP) recycling on hydrochar properties, iron evolution and environmental assessment during HTC of sludge. The results show that AP recycling process improves the dewatering performance of hydrochar and facilitates the recovery of Fe from the liquid phase.
Article
Energy & Fuels
He Liang, Tao Wang, Zhenmin Luo, Jianliang Yu, Weizhai Yi, Fangming Cheng, Jingyu Zhao, Xingqing Yan, Jun Deng, Jihao Shi
Summary: This study investigated the influence of inhibitors (carbon dioxide, nitrogen, and heptafluoropropane) on the lower flammability limit of hydrogen and determined the critical inhibitory concentration needed for complete suppression. The impact of inhibitors on explosive characteristics was evaluated, and the inhibitory mechanism was analyzed with chemical kinetics. The results showed that with the increase of inhibitor quantity, the lower flammability limit of hydrogen also increased. The research findings can contribute to the safe utilization of hydrogen energy.
Article
Energy & Fuels
Zonghui Liu, Zhongze Zhang, Yali Zhou, Ziling Wang, Mingyang Du, Zhe Wen, Bing Yan, Qingxiang Ma, Na Liu, Bing Xue
Summary: In this study, high-performance solid catalysts based on phosphotungstic acid (HPW) supported on Zr-SBA-15 were synthesized and evaluated for the one-pot conversion of furfural (FUR) to γ-valerolactone (GVL). The catalysts were characterized using various techniques, and the ratio of HPW and Zr was found to significantly affect the selectivity of GVL. The HPW/Zr-SBA-15 (2-4-15) catalyst exhibited the highest GVL yield (83%) under optimized reaction conditions, and it was determined that a balance between Bronsted acid sites (BAS) and Lewis acid sites (LAS) was crucial for achieving higher catalytic performance. The reaction parameters and catalyst stability were also investigated.
Article
Energy & Fuels
Michael Stoehr, Stephan Ruoff, Bastian Rauch, Wolfgang Meier, Patrick Le Clercq
Summary: As part of the global energy transition, an experimental study was conducted to understand the effects of different fuel properties on droplet vaporization for various conventional and alternative fuels. The study utilized a flow channel to measure the evolution of droplet diameters over time and distance. The results revealed the temperature-dependent effects of physical properties, such as boiling point, liquid density, and enthalpy of vaporization, and showed the complex interactions of preferential vaporization and temperature-dependent influences of physical properties for multi-component fuels.
Article
Energy & Fuels
Yuan Zhuang, Ruikang Wu, Xinyan Wang, Rui Zhai, Changyong Gao
Summary: Through experimental validation and optimization of the chemical kinetic model, it was found that methanol can accelerate the oxidation reaction of ammonia, and methanol can be rapidly oxidized at high concentration. HO2 was found to generate a significant amount of OH radicals, facilitating the oxidation of methanol and ammonia. Rating: 7.5/10.
Article
Energy & Fuels
Radwan M. EL-Zohairy, Ahmed S. Attia, A. S. Huzayyin, Ahmed I. EL-Seesy
Summary: This paper presents a lab-scale experimental study on the impact of diethyl ether (DEE) as an additive to waste cooking oil biodiesel with Jet A-1 on combustion and emission features of a swirl-stabilized premixed flame. The addition of DEE to biodiesel significantly affects the flame temperature distribution and emissions. The W20D20 blend of DEE, biodiesel, and Jet A-1 shows similar flame temperature distribution to Jet A-1 and significantly reduces UHC, CO, and NOx emissions compared to Jet A-1.
Article
Energy & Fuels
Jiang Bian, Ziyuan Zhao, Yang Liu, Ran Cheng, Xuerui Zang, Xuewen Cao
Summary: This study presents a novel method for ammonia separation using supersonic flow and develops a mathematical model to investigate the condensation phenomenon. The results demonstrate that the L-P nucleation model accurately characterizes the nucleation process of ammonia at low temperatures. Numerical simulations also show that increasing pressure and concentration can enhance ammonia condensation efficiency.
Article
Energy & Fuels
Shiyuan Pan, Xiaodan Shi, Beibei Dong, Jan Skvaril, Haoran Zhang, Yongtu Liang, Hailong Li
Summary: Integrating CO2 capture with biomass-fired combined heat and power (bio-CHP) plants is a promising method for achieving negative emissions. This study develops a reliable data-driven model based on the Transformer architecture to predict the flowrate and CO2 concentration of flue gas in real time. The model validation shows high prediction accuracy, and the potential impact of meteorological parameters on model accuracy is assessed. The results demonstrate that the Transformer model outperforms other models and using near-infrared spectral data as input features improves the prediction accuracy.