Article
Green & Sustainable Science & Technology
Di Wu, Feng Miao, Xueying Liu, Xiaochun Xiao, Wenbo Zhai
Summary: The study confirmed the effectiveness of Langmuir, SDR, and SLD models in predicting high-pressure adsorption, with the SLD model showing stronger predictive capability.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2021)
Article
Engineering, Environmental
Lei Chen, Keyu Liu, Shu Jiang, Hexin Huang, Jingqiang Tan, Luo Zuo
Summary: The study evaluated the accuracy of different methods for methane excess adsorption correction using the Polanyi adsorption potential theory. The results suggest that an adsorbed phase density around 0.30 g/cm³ to 0.40 g/cm³ may yield results close to the actual adsorption. Comparing the results with previous studies on methane adsorption on shale further supported the conclusions in this study.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Hasan Ghasemzadeh, Saeed Babaei, Stephane Tesson, Jafar Azamat, Mehdi Ostadhassan
Summary: Estimating an accurate quantity of adsorbed density in shale reservoirs is crucial for production, sequestration, and enhanced oil recovery. This study used hybrid molecular dynamics/grand canonical Monte Carlo simulations to investigate methane adsorbed density under different conditions, showing that the selected range from the methane density profile significantly affects the estimation of the absolute adsorption isotherm. Adsorbed density calculated with the effective pore width from helium probe was found to be the most appropriate in calculating the accessible pore volume for excess adsorption isotherm.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Qingquan Liu, Biao Lv, Yuanyuan Liu, Xiaohang Ma, Xiaodong Lu, Liang Wang, Hongxing Zhou
Summary: In this study, a coupled gas flow model considering the hysteresis effect of adsorption and desorption was constructed, and the reliability of the model was verified. The results show that the hysteresis effect has a significant influence on gas extraction.
Article
Engineering, Environmental
Bo Liu, Saeed Babaei, Longhui Bai, Shansi Tian, Hasan Ghasemzadeh, Mehrab Rashidi, Mehdi Ostadhassan
Summary: This study investigated the behavior of ethane in graphene layers using simulations and analyzed the absolute adsorption isotherm using adsorption models. The results showed that the current adsorption models cannot accurately predict absolute adsorption, suggesting that adsorbed volume should be favored for estimating absolute adsorption.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Guangzhao Zhou, Zhiming Hu, Zhaobin Gu, Jin Chang, Xianggang Duan, Xiangui Liu, Hongming Zhan
Summary: This study explores the distribution of multiphase methane in shale using NMR and adsorption experiments, focusing on factors such as rock components, clay mineral types, and fluid states. Analysis of the T-2 signal spectrum reveals the distribution of adsorbed and free methane in shale, and a mathematical model is proposed to simulate the characteristics of methane in the adsorption-desorption process.
Article
Chemistry, Physical
Ke Hu, Helmut Mischo
Summary: This study applies a reliable mathematical framework to estimate the adsorption behavior of methane in shale under high-pressure and high-temperature conditions, based on low-pressure excess adsorption data. The results show that the commonly used Dubinin-Radushkevich model underestimates methane adsorption at high pressure, and the volume of adsorbed methane increases with pressure and temperature, while the density decreases and eventually reaches a steady state at high pressure.
ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
(2022)
Article
Thermodynamics
Guangzhao Zhou, Xianggang Duan, Jin Chang, Yu Bo, Yuhan Huang
Summary: Understanding the competitive adsorption-desorption mechanisms in shale is crucial for improving CH4 recovery and CO2 sequestration. This study used nuclear magnetic resonance to investigate the impact of CO2 on the adsorption-desorption behaviors of CH4 in plug-sized samples. The results revealed distinct peaks in the transverse relaxation time (T2) spectrum, indicating the different states of adsorbed CH4 and free state CH4 in pores and fractures. The introduction of CO2 led to changes in the T2 signals, resulting in a higher desorption rate of adsorbed CH4.
Article
Agronomy
Shagufta Gaffar, Sanku Dattamudi, Amin Rabiei Baboukani, Saoli Chanda, Jeffrey M. Novak, Donald W. Watts, Chunlei Wang, Krishnaswamy Jayachandran
Summary: The study found that biochars produced from coconut husk feedstock have good adsorption capacity for atrazine, with CH350 biochar performing the best and significantly outperforming unamended soil in adsorption. Biochar is able to retain a considerable amount of atrazine even after desorption, indicating its potential in preventing groundwater contamination.
Article
Energy & Fuels
Feng Miao, Di Wu, Xueying Liu, Xiaochun Xiao, Wenbo Zhai, Yanyan Geng
Summary: This study investigated shale gas storage capacity by considering the effect of burial depth on shale pore structure, establishing a model that takes into account the influence of in situ stress. The findings highlight the importance of in situ stress in controlling shale pore structure and gas storage capacity, providing valuable insights for future evaluation of shale gas reserves.
Article
Energy & Fuels
Zhong-Hua Liu, Jia-Chun Wang, Bao-Jun Bai, Yan-Ling Wang
Summary: This study investigates the effect of a clay stabilizer solution on methane desorption kinetics and isotherms in Longmaxi shale. The results show that the clay stabilizer improves the diffusion rate constant and reduces methane adsorption amount. Moreover, it promotes the conversion of adsorbed methane to free gas.
Article
Energy & Fuels
Venkata Yasaswy Turlapati, Basanta Kumar Prusty, Samir Kumar Pal, Elangovan Raja
Summary: Supercritical adsorption studies are crucial for understanding the contribution of adsorbed methane to shale reservoirs. Different models for characterizing adsorption in shale reservoirs are revisited and analyzed. Fixed-density approaches are found to be more applicable than varying density approaches. The mathematical drawbacks of variable density approaches are explained.
Article
Geochemistry & Geophysics
Bojiang Fan, Liang Shi, Xia Wang, Chi Wang, Yating Li, Feifei Huang
Summary: This study focuses on the Chang-7 shale in the Ordos Basin and aims to understand the distribution characteristics and migration ability of gas components. The research confirms that shale gas in different locations has unique gas components due to gas migration.
Article
Energy & Fuels
Kang Yang, Junping Zhou, Xuefu Xian, Yongdong Jiang, Chengpeng Zhang, Zhaohui Lu, Hong Yin
Summary: The study investigated the impact of supercritical CO2-water exposure on the adsorption characteristics of shale, revealing that increasing exposure pressure and decreasing exposure temperature resulted in a gradual decrease in CH4 and CO2 adsorption capacity in shale due to alterations in mineral composition and pore structure. The study also found that the selectivity factor of CO2 to CH4 decreased with increasing exposure pressure and decreasing temperature, indicating the feasibility of CO2-enhanced shale gas recovery and sequestration even after exposure to ScCO2-water.
Review
Engineering, Environmental
Xiaoxi Cheng, Yuanping Cheng, Chenghao Wang, Biao Hu, Jia Wang
Summary: This paper systematically reviews and summarizes the calculation methods of adsorption phase density, including empirical methods, indirect methods, and direct methods. The accuracy of the calculation results is influenced by data processing, measurement method, and theoretical model selection. Considering the complexity of the pore system in coal, a direct calculation method for adsorption phase density taking into account multistage adsorption behavior is proposed.
CHEMICAL ENGINEERING JOURNAL
(2023)
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.