Article
Agricultural Engineering
Reda Z. K. Hussein, Nahed K. Attia, Mai K. Fouad, Shakinaz T. ElSheltawy
Summary: Waste cooking oil was used to synthesize biolubricant, with optimized conditions achieving the highest conversion rate. The structural and thermal properties of the produced biolubricant were tested, showing compliance with ISO VG68 viscosity grade and better low temperature applicability. Simulation results demonstrated the industrial applicability of the studied biolubricant production process using different models on Aspen HYSYS program version 9.
BIOMASS & BIOENERGY
(2021)
Article
Thermodynamics
Muhammad Ibrahim, Tareq Saeed, Ahmed Mohammed Alshehri, Yu-Ming Chu
Summary: The study examined the ability of artificial neural networks to predict the viscosity of the graphene nanosheets/ethylene glycol mixture. The approved ANN with 10 neurons in the middle layer demonstrated acceptable performance based on statistical calculations of MSE and R-2 values, with a slight decrease in accuracy observed at higher temperatures.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Chemistry, Physical
Milan Vranes, Ivona Radovic, Sinisa Bikic, Aleksandar Tot, Mirjana Kijevcanin, Milana Zaric, Teona Teodora Borovic, Snezana Papovic
Summary: This article provides a detailed physicochemical characterization of ethylene glycol and caffeine + ethylene glycol mixtures through experimental measurements and molecular dynamic simulations. The addition of caffeine reduces the viscosity of ethylene glycol, while caffeine molecules tend to self-aggregate due to weak interactions with ethylene glycol.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Physical
Arantxa Arbe, Goran J. Nilsen, Mark Devonport, Bela Farago, Fernando Alvarez, Jose A. Martinez Gonzalez, Juan Colmenero
Summary: By using time-of-flight neutron spectroscopy with polarization analysis, this study separated coherent and incoherent contributions to the scattering of deuterated tetrahydrofuran. The comparison with water reveals similar phenomenology, indicating the influence of inter-molecular interactions on dynamics. The study shows a crossover in the structural relaxation and different characteristic times for collective and self-motions compared to water.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Engineering, Environmental
Gang Wang, Shirun Zhao, Haoyu Yao
Summary: The co-production of dimethyl carbonate (DMC) and ethylene glycol (EG) via transesterification of ethylene carbonate (EC) has been studied using metal chloride-based ionic liquids (ILs) as catalysts. The interaction between cation and methanol, as well as the activation of carbonyl group in EC by metal chloride-contained anion, showed synergistic effects on catalytic transesterification. The reaction rates were affected by the steric hindrance effect of the alkyl group substituted at the N atom in the imidazole ring. The Al2Cl7 species in AlCl3-based IL exhibited activity in the transesterification, and its content showed a linear relationship with the transformative rates of both EC and HEMC. The kinetic studies revealed that the reaction rates were first-order dependent on the concentrations of EC (or HEMC) and methanol, and the formation of HEMC intermediate was the kinetic-relevant step. The catalysis of [MDMIM]Cl/AlCl3 with an AlCl3 molar fraction of 0.67 showed higher performance compared to other metal chloride-based ILs, with a yield and selectivity of DMC (or EG) reaching up to 95% and 97%, respectively, after 12 hours of reaction at 140 degrees C. The IL also demonstrated good recyclability without decay in catalytic activity and selectivity after 10 times' recycling.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Biotechnology & Applied Microbiology
Rodolpho R. C. Monteiro, Angel Berenguer-Murcia, Javier Rocha-Martin, Rodrigo S. Vieira, Roberto Fernandez-Lafuente
Summary: The increasing concerns about energy consumption and environmental preservation have led to a growing interest in the production of biolubricants. This review explores the various methods of producing these molecules using lipases, including esterification of free fatty acids, hydroesterification or transesterification of oils and fats, transesterification of biodiesel with suitable alcohols, estolide production, and fatty acid modification. The utilization of discarded substrates, such as waste oil, also offers ecological benefits. The advantages and disadvantages of these production methods, as well as general considerations for process optimization, are discussed. Potential solutions to address the challenges in biolubricant production are also examined.
BIOTECHNOLOGY ADVANCES
(2023)
Article
Materials Science, Characterization & Testing
K. M. Yashawantha, Afzal Asif, G. Ravindra Babu, M. K. Ramis
Summary: The research investigates the rheological behavior and thermal conductivity of graphite-ethylene glycol nanofluid. It is found that the viscosity of the nanofluid slightly increases with volume concentration but decreases with temperature. The thermal conductivity of the nanofluid also varies with nanoparticle size.
JOURNAL OF TESTING AND EVALUATION
(2021)
Article
Thermodynamics
Adnan Qamar, Attique Arshad, Zahid Anwar, Rabia Shaukat, Muhammad Amjad, Shahid Imran, Luqman Razzaq, Muhammad Ali, Theodosios Korakianitis
Summary: With the advancement of nanoscience, nanofluids are gaining popularity among thermal engineers due to their high thermal conductivity and larger surface area of nanoparticles. Studies have shown that nanofluids prepared with pure ethylene glycol exhibit better stability, while viscosity increases with particle loading.
Article
Thermodynamics
Jianhong Bao, Rodolphe Heyd, Gilles Regnier, Amine Ammar, Jorge Peixinho
Summary: This paper presents the experimental results of studying graphene particle suspensions in lubricating oil, ethylene glycol, and glycerol-based fluids. The viscosity of the graphene particles with different specific surface areas varies with the shear rate and temperature. The lubricating effect, i.e., a decrease in viscosity compared to the base fluid, is observed for concentrations below 0.4 mass% in lubricating oil and glycerol. The activation energy slightly decreases within the studied parameters (e.g., concentration below 1 mass% and temperature up to 80℃). The increase in viscosity with graphene volume fraction is more significant in ethylene glycol.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Biotechnology & Applied Microbiology
F. Javier Ramos, Juan Carlos de Haro, Juan Francisco Rodriguez, Angel Perez, Manuel Carmona
Summary: The production of oleic-based trimethylolpropane (TMP) esters via esterification reaction was explored using the environmentally friendly catalyst methanesulfonic acid. The study focused on the homogeneous acid catalyst, the optimal OA/TMP molar ratio, esterification reaction enhancement, and a new purification technique. The effects of intermediate products and temperature on kinematic viscosity were investigated. The findings revealed the impact of different factors on the viscosity of the products.
BIOFUELS BIOPRODUCTS & BIOREFINING-BIOFPR
(2022)
Article
Environmental Sciences
Rohinee M. Barai, Devesh Kumar, Atul Wankhade, Aamir R. Sayed, Anup A. Junankar
Summary: Nanofluids, with their remarkable thermal characteristics and potential applications, are expected to play a significant role in future thermal management systems.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Green & Sustainable Science & Technology
M. Venkatesh, J. Ashokraj, P. Raghu Babu, K. J. Sreeram, M. Suguna Lakshmi
Summary: This study synthesized a highly water dispersible and stable phosphorylated fatliquor from waste cooking oil for leather applications, and evaluated its properties through various analysis methods.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Chemistry, Physical
Aycan Altun, Osman Nuri Sara
Summary: In this study, the densities and viscosities of binary mixtures of 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide, [bmim][NTf2], and ethylene glycol (EG) were experimentally measured. A first-order polynomial and Vogel-FulcherTammann equation were used to estimate the densities and viscosities of the mixtures, respectively. The excess molar volume, viscosity, and Gibbs energy of activation for viscous flow were calculated and fitted to the Redlich-Kister equation. The thermal expansion coefficients and partial and apparent molar volumes of [bmim][NTf2] and EG in their binary mixtures were also investigated.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Energy & Fuels
Simona Morariu, Mirela Teodorescu, Maria Bercea
Summary: The rheological properties of PEG/Lap and PPG/Lap dispersions with clay concentrations exceeding 2.55% and 3.10% can be utilized for drilling fluid formulations, with changes observed in the presence of NaCl.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Thermodynamics
Francisca J. Justel, Yecid P. Jimenez
Summary: The physical properties of the ternary {Fe-2(SO4)(3) + PEG 4000 + H2O} system and its binary systems were experimentally determined and correlated using Othmer's rule at three different temperatures, showing good agreement between experimental and correlated data. Derived properties like isentropic compressibility and excess molar volumes were also determined. Predictions of densities and refractive indices using the Lorentz-Lorenz approximation also showed good agreement between experimental and predicted data.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2021)
Article
Energy & Fuels
E. G. Al-Sakkari, S. T. El-Sheltawy, M. F. Abadir, N. K. Attia, G. El-Diwani
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2017)
Review
Energy & Fuels
Hassan I. El Shimi, Nahed K. Attia, Guzine I. El Diwani, Shakinaz T. El Sheltawy
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2016)
Article
Environmental Sciences
G. El Diwani, N. K. Attia, S. I. Hawash
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2009)
Review
Green & Sustainable Science & Technology
S. A. Abo El-Enin, N. K. Attia, N. N. El-Ibiari, G. I. El-Diwani, K. M. El-Khatib
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2013)
Article
Multidisciplinary Sciences
Samar A. El-Mekkawi, Ibrahim M. Ismail, Mohammed M. El-Attar, Alaa A. Fahmy, Samia S. Mohammed
JOURNAL OF ADVANCED RESEARCH
(2011)
Article
Energy & Fuels
Nagwa G-E. Mohammady, K. M. El-Khatib, M. I. El-Galad, S. A. Abo El-Enin, N. K. Attia, R. El-Araby, Guzine El Diwani, Schonna R. Manning
Summary: The economic feasibility of commercial-scale Nannochloropsis sp. cultivation for biodiesel production and co-products was evaluated. The study showed that under appropriate conditions, high cell growth and productivity were achieved. However, additional high-value co-products are needed to improve the return on investment.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Agricultural Engineering
Reda Z. K. Hussein, Nahed K. Attia, Mai K. Fouad, Shakinaz T. ElSheltawy
Summary: Waste cooking oil was used to synthesize biolubricant, with optimized conditions achieving the highest conversion rate. The structural and thermal properties of the produced biolubricant were tested, showing compliance with ISO VG68 viscosity grade and better low temperature applicability. Simulation results demonstrated the industrial applicability of the studied biolubricant production process using different models on Aspen HYSYS program version 9.
BIOMASS & BIOENERGY
(2021)
Article
Engineering, Environmental
Samar A. El-Mekkawi, Hala S. Doma, Gamila H. Ali, Sayeda M. Abdo
Summary: The study highlights the effective use of microalgae in treating wastewater to minimize environmental impact and produce sustainable products. Economic assessment shows a promising return on investment for this technology. Feasibility study of large-scale systems reveals great potential, paving the way for a zero-waste process.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Energy & Fuels
Eslam G. Al-Sakkari, Nahed K. Attia, Mahmoud M. Habashy, Omar M. Abdeldayem, Salwa R. Mostafa, Shakinaz T. El-Sheltawy, Magdi F. Abadir, Mohamed K. Mostafa, Eldon R. Rene, Said S. E. H. Elnashaie
Summary: A bi-functional catalyst based on natural components was designed and optimized for simultaneous esterification-transesterification process, achieving a maximum total esters yield of 97%. The catalyst can be reused 25 times without a decline in catalytic activity and meets ASTM standards for biodiesel.
Article
Chemistry, Physical
E. G. Al-Sakkari, S. T. El-Sheltawy, N. K. Attia, S. R. Mostafa
APPLIED CATALYSIS B-ENVIRONMENTAL
(2017)
Article
Multidisciplinary Sciences
Samar A. El-Mekkawi, N. N. El-Ibiari, Ola A. El-Ardy, Nabil M. Abelmonem, Ahmed H. Elahwany
RESEARCH JOURNAL OF PHARMACEUTICAL BIOLOGICAL AND CHEMICAL SCIENCES
(2016)
Article
Multidisciplinary Sciences
Samar A. El-Mekkawi, N. N. El-Ibiari, Ola A. El-Ardy, Nabil M. Abelmonem, Ahmed H. Elahwany
RESEARCH JOURNAL OF PHARMACEUTICAL BIOLOGICAL AND CHEMICAL SCIENCES
(2016)
Article
Chemistry, Multidisciplinary
N. K. Attia, A. G. Gadalla, N. N. Ibiari, R. El-Araby, G. I. El-Diwani
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.