Article
Chemistry, Physical
Lebohang Macheli, Emanuela Carleschi, Bryan P. Doyle, Gerard Leteba, Eric van Steen
Summary: Metal-support interactions in inverse catalysts prepared by adsorbing TEOS on Co3O4 can be manipulated by varying the solvent mixture. Deposition of TEOS on Co3O4 nanoparticles in n-hexane results in the formation of silica oligomers interacting strongly with cobalt(II,III)oxide after calcination at 573 K. Modification of Co3O4 nanoparticles with TEOS in a hydrolysing environment results in a stronger interaction due to the formation of surface cobalt silicate through hydrolysis.
JOURNAL OF CATALYSIS
(2021)
Article
Energy & Fuels
Chike George Okoye-Chine, Mahluli Moyo, Diane Hildebrandt
Summary: By varying the degree of hydrophobization of SiO2 supports, the catalytic activity of Co catalysts supported on SiO2 was enhanced, also promoting the hydrogenation of CO. It was observed that higher hydrophobicity resulted in larger cobalt clusters, decreasing the reducibility of cobalt oxides and leading to a decline in activity.
Article
Energy & Fuels
Kailin Li, Changqing Yin, Xingjian Dai, Jiayun Zhang, Shuang Yi, Jinsong Rao, Yuxin Zhang
Summary: Layered transition metal hydroxide is a potential energy storage material with large specific surface area, adjustable composition, and abundant active components. The performance of the binder-free electrodes in the study showed that the ternary LDH electrode had better electrochemical properties than the binary one, and the partially sulfide Ni1Co2S/Ni electrode exhibited the optimal performance. The hybrid supercapacitor device assembled with Ni1Co2S as the positive electrode and active graphene as the negative electrode displayed high energy density, good rate capability, and cycling stability.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Chemistry, Multidisciplinary
Christel Olivier Lenge Mbuya, Chike George Okoye-Chine, Katu Ramutsindela, Linda L. Jewell, Mike Scurrell
Summary: This research article investigates the effects of microwave modification on Fe/beta-SiC catalysts for Fischer-Tropsch synthesis. The results show that microwave irradiation can increase the surface area of the catalyst and decrease the silicon percentage on its surface, leading to improved CO conversion. However, prolonged exposure to microwave irradiation increases the selectivity of CH4.
REACTION CHEMISTRY & ENGINEERING
(2022)
Article
Engineering, Environmental
Jianan Cui, Tingting Liu, Qian Zhang, Ting Wang, Xiaohong Hou
Summary: A novel catalyst was successfully prepared in this study, which can efficiently activate peroxymonosulfate for the degradation of organic pollutants, especially showing significant performance in BPF removal. The catalyst exhibited excellent catalytic activity over a wide range of pH values.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Physics, Particles & Fields
M. Z. Bhatti, Z. Yousaf, S. Hanif
Summary: This study investigates the existence of complexity in terms of f(T) gravity, focusing on the division of intrinsic curvature in an orthogonal way and the correlation between various mass definitions and the conformal tensor. The impact of local anisotropy and the homogeneity or inhomogeneity of energy density is considered. The study establishes relationships between already defined variables and interprets complexity as a scalar Y-TF. Specific interior solutions satisfying the criterion of vanishing scalar Y-TF are determined.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Materials Science, Ceramics
Yoshitaka Ono, Sho Nagai, Yasuo Hayashi, Shu-hei Urashima, Hiroharu Yui
Summary: Etching of SiO2 is important in the production of silica glass components and semiconductor devices. Wet-etching with hydrogen fluoride (HF) solutions is commonly used, but faces issues with microstructure sticking during solution drying. To overcome this, a dry-etching technique with gaseous HF at high temperatures was developed. Interesting results showed that silicon thermal oxides were less etched than vitreous silica by gaseous HF, indicating a difference in surface species affecting the reaction rate.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Biswajit Bera, Nandini Das
Summary: The study focuses on the development of carbon-loaded SBA 15 membrane for CO2 separation from different gas mixtures. By modifying the pore structure of SBA 15 with graphitic carbon, the membrane showed improved separation efficiency, with highest CO2/CH4 separation factor achieved at 16.9 and highest CO2/CO separation factor at 32.8. The results demonstrate the potential of the developed SBA 15/C composite membranes for commercial applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Environmental Sciences
Aswanidevi Kongasseri, Prabhakaran Deivasigamani, Akhila Maheswari Mohan
Summary: This study introduces two novel solid-state opto-chemosensors with exclusive selectivity and excellent sensitivity for naked-eye detection of ultra-trace Co2+ ions. The sensors exhibit rapid response kinetics, high reusability, and good chemical and thermal durability, making them suitable for real-time monitoring of environmental and industrial water samples.
ENVIRONMENTAL RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Sayan Atta, Amit Majumdar
Summary: A new mononuclear cobalt(III)-pentasulfido compound has been synthesized through a convergent redox reaction between two new cobalt(II)-thiolato compounds and elemental sulfur. This compound, which has a low-spin, diamagnetic Co(III) center with a coordinated pentasulfido chain, is unprecedented in the literature.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Energy & Fuels
Filiz Akti
Summary: Silica xerogel supported cobalt catalysts were prepared by sol-gel method for hydrogen generation from an alkaline sodium bomhydride solution. The effect of APTES modification and calcination treatment on the catalysts' structural properties and catalytic activity was investigated. Various analysis techniques were used to evaluate the physicochemical properties of the catalysts. Results showed that APTES modification and calcination treatment led to increased surface area and total pore volume values, improving the catalytic performance.
Article
Chemistry, Inorganic & Nuclear
Kaiqi Guan, Jingxian Wu, Jing Zhou, Yang Li, Lingnan Pei, Xin Shi
Summary: This study proposes a decision-tree-guided synthesis strategy for morphology control of metal phosphonates. By constructing a binary decision tree and screening key synthetic conditions, the desired morphology control can be achieved, which is highly efficacious for metal phosphonates.
INORGANIC CHEMISTRY
(2023)
Article
Engineering, Electrical & Electronic
Rongxin Chen, Li Cheng, Yunfan Liu, Liang Yu, Ruijin Liao, Tingting Wang
Summary: This article introduces a green pyrolysis recycling method for waste composite insulators, in which the experimental device is improved and the recycling process is optimized to obtain nanosilica microspheres (NSMs) with higher purity and controllable particle size for state-of-the-art engineering applications.
Article
Crystallography
Lijuan Zhang, Xiaolong Jiang, Jing Chen, Chuanchao Zhang, Lianghong Yan, Haijun Wang, Xiaoyu Luan, Wei Liao, Xiaodong Jiang, Yong Jiang
Summary: In this paper, single-layer SiO2 sol-gel antireflection films pretreated by triple-frequency laser with different parameters are characterized by macroscopical parameters such as transmittance, refractive index, and thickness. The law of surface modification and the defect removal mechanism of the SiO2 sol-gel antireflection film by laser conditioning are obtained. It is found that laser conditioning can reduce the thickness of the film, introduce densification, and eliminate micro-defects, which is the main reason for improving the laser damage resistance of films.
Article
Chemistry, Multidisciplinary
Jiajuan Li, Zizhu Wang, Yirui Ma, Caiyun Xu, Shenghu Zhou
Summary: In this study, mesoporous silica SBA-16-supported NiCo bimetallic nanocatalysts were synthesized and confirmed through various characterization techniques. The synthesized NiCo/SBA-16 showed enhanced catalytic performance for the hydrogenation of nitroaromatics. The improved catalytic performance was attributed to the formation of NiCo bimetallic nanostructures, where the synergistic effect between Ni and Co enhanced their catalytic activities.
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.