Article
Engineering, Chemical
Yongde Ma, Jiayin Zhang, Wenquan Wu, Zhenping Cai, Yanning Cao, Kuan Huang, Lilong Jiang
Summary: In this study, trialkylmethylammonium molybdate ionic liquids (ILs) with multiple long-chain alkyl groups were designed and applied as the oil-soluble precursors of dispersed metal catalysts for slurry-phase hydrocracking. The performance and sulfidation behavior of molybdate ILs were characterized, and the different performance of oil-soluble precursors was explained by isolating and characterizing the dispersed MoS2 catalysts. The performance of molybdate ILs for slurry-phase hydrocracking of heavy oils was investigated, and the favored routes for the conversion of heavy oils were determined based on reaction rate constants calculated from a kinetical model.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Chemistry, Physical
Donghun Lee, Yong -Kul Lee
Summary: The structure and catalytic activity of dispersed VxMo(1_x)S2 catalysts were investigated for hydrocracking of vacuum residue. The catalysts were prepared in situ using vanadium acetylacetonate and molybdenum hexacarbonyl as precursors. Characterization of the catalyst structure confirmed the formation of well-dispersed V-MoS2 phase. The V-MoS2 catalysts exhibited higher stability in the catalyst recycle test compared to monometallic sulfides.
JOURNAL OF CATALYSIS
(2022)
Article
Energy & Fuels
M. A. Coronel-Garcia, A. I. Reyes de la Torre, J. M. Dominguez-Esquivel, J. A. Melo-Banda, A. L. Martinez-Salazar
Summary: The kinetics of slurry phase heavy oil hydrocracking with nickel nanoparticles dispersed in PEG300 as the catalyst were studied. The reaction rate equation order was determined to be 2.5, and high residue conversion and selectivity towards naphtha were achieved. This study provides valuable insights for improving heavy oil hydrocracking processes.
Article
Energy & Fuels
Chan Hun Kim, Young Gul Hur, Kwan-Young Lee
Summary: The ratio of Ni to W in NiWC catalyst significantly affects the hydrogen adsorption and carburization degree. Finding the optimal ratio is crucial for maximizing catalytic activity. While Ni addition can enhance catalytic activity, it may also lead to surface carbon deposition.
Article
Chemistry, Physical
Zhenping Cai, Yongxin Ding, Jiayin Zhang, Panjie Yu, Yongde Ma, Yanning Cao, Ying Zheng, Kuan Huang, Lilong Jiang
Summary: In this study, oil-soluble Mo-based ionic liquids were used as precursors to produce MoS2 catalysts for the hydroconversion of biolipids. The in situ generated MoS2 catalysts showed excellent activity in converting methyl palmitate and hexadecane to biodiesel. The structures of the catalysts were characterized, and the hydroconversion kinetics and pathways were analyzed. High conversions of feeds and selectivities of HDO products were achieved in the hydroconversion of methyl palmitate and palm oil under solvent-free condition.
JOURNAL OF CATALYSIS
(2023)
Article
Energy & Fuels
Hung Hai Pham, Kwang Ho Kim, Kang Seok Go, Nam Sun Nho, Woohyun Kim, Eun Hee Kwon, Ryu Ho Jung, Young-il Lim, Suk Hyun Lim, Dung Anh Pham
Summary: A kinetic model for the slurry phase hydrocracking of vacuum residue was proposed, with a five-lump model and ten reaction pathways adopted to describe the hydrocracking kinetics. The kinetic parameters were estimated considering the change in liquid density with reaction time, and the model predicted product yields and concentrations with an average error of less than 10%.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Environmental
Xiangyang Zhu, Wenjie Wang, Huifang Xing, Qinling Bi, Li Wang, Meng Rong, Shan Ni, Menglei Yuan, Liangrong Yang, Huizhou Liu
Summary: A simple and universal strategy was presented to synthesize Fe3O4@PDA@shell nanoparticles, which showed improved dispersity and stability of nanosized MoS2 catalysts. The versatility of this strategy for other shell materials was also demonstrated, providing promising potential for designing multifunctional core-shell-shell materials for various applications.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Donghun Lee, Ki-Duk Kim, Yong-Kul Lee
Summary: Bimetallic CoWS2 catalysts were synthesized during slurry phase hydrocracking (HCK) of vacuum residue (VR) using W(CO)6 and Co-octoate as oil-soluble precursors. The dispersed catalysts were characterized by TEM and XAS, showing that the CoWS2 catalyst formed well-dispersed monolayers. This catalyst exhibited higher TOF and C7-ASP conversions compared to monometallic WS2 or Co9S8 catalysts in the VR HCK.
JOURNAL OF CATALYSIS
(2023)
Article
Chemistry, Multidisciplinary
Ngoc Thuy Nguyen, Ki Hyuk Kang, Hai Hung Pham, Kang Seok Go, Duy Van Pham, Pill Won Seo, Nam Sun Nho, Chul Wee Lee, Sunyoung Park
Summary: This study investigated the effect of catalyst concentration on the reaction performance of slurry phase hydrocracking of vacuum residue. Results showed that high catalyst concentrations could suppress secondary cracking reactions and alter the conversion behavior of asphaltenes, leading to the proposal of equations for coke formation onset and a kinetic model. Overall, the transformation of residue to coke was dominant in non-catalytic hydrocracking and the coke formation rate decreased significantly with increasing catalyst concentration.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Energy & Fuels
Francisco J. Vela, Roberto Palos, David Trueba, Tomas Cordero-Lanzac, Javier Bilbao, Jose M. Arandes, Alazne Gutierrez
Summary: A six lump-based kinetic model was developed to predict the hydrocracking process of a blend of high-density polyethylene (HDPE) and vacuum gas oil (VGO). The model identified the optimal operating conditions for achieving high conversion rates and liquid fuel production.
Article
Energy & Fuels
Hui Luo, Jian Sun, Wenan Deng, Chuan Li, Feng Du
Summary: In this study, oil-soluble Fe-Ni sulfide nanoparticles (FeNiSx) were prepared and used as a catalyst for slurry-phase hydrocracking of Liaohe vacuum residue (LHVR). The FeNiSx particles exhibited excellent hydrocracking activity, converting LHVR into light oil with lower coke and gas formation. The yield of light oil per unit of coke formation was significantly increased, and the conversion of resin and asphaltene was also high. The FeNiSx particles had good solubility and dispersibility, resulting in their excellent catalytic performance.
Article
Energy & Fuels
Qing-Yan Cui, Hao-Bin Zhang, Ting-Hai Wang, Chao Yan, Yan-Ning Cao, Yuan-Yuan Yue, Li-Long Jiang, Xiao-Jun Bao
Summary: The study focused on the preparation and performance of rectorite-supported catalysts, revealing that the calcination of rectorite helped improve the yields of naphtha and middle distillates in slurry-phase hydrocracking of vacuum residue.
Article
Chemistry, Multidisciplinary
Dicho Stratiev, Ivelina Shishkova, Rosen Dinkov, Iliyan Kolev, Georgi Argirov, Vitaly Ivanov, Simeon Ribagin, Vassia Atanassova, Krassimir Atanassov, Danail Stratiev, Svetoslav Nenov, Dimitar Pilev, Dobromir Yordanov
Summary: The intercriteria analysis based on intuitionistic fuzziness and index matrices was used to evaluate the processing data of the LUKOIL Neftohim Burgas H-Oil ebullated bed vacuum residue hydrocracker. The study aimed to identify the reasons for increased fouling during the 3rd cycle of the H Oil hydrocracker. It was found that excessive fouling occurs when the ratio of the temperature difference between the 1st and 2nd reactor is lower than 2.0. The fouling is influenced by the processing of lower Conradson carbon content vacuum residual oils, increased throughput, and the dosage of the HCAT nanodispersed catalyst.
Article
Environmental Sciences
Zhengqin Shi, Ping Zhang, Xiaohan Li, Yijie Zheng, Juanxi Huang, Yaxuan Wang, Xiatiao Luo, Gaosheng Zhang, Tangfu Xiao, Jianyou Long, Huosheng Li
Summary: This study investigated the performance and mechanisms of sulfidized zero-valent manganese (SZVMn) for removing thallium (Tl) from wastewater. The results showed that liquid nitrogen modified SZVMn (LSZVMn) had more interior channels and pores than SZVMn, leading to improved adsorption of Tl(I). LSZVMn demonstrated effectiveness and robustness in Tl(I) removal in the presence of co-existing ions up to 0.1 M. The mechanism of Tl(I) removal with SZVMn involved sulfidation-induced precipitation, manganese reduction, surface complexation, and electrostatic attraction.
Article
Chemistry, Physical
Xiangyang Zhu, Dong Qiao, Liangrong Yang, Qinling Bi, Huifang Xing, Shan Ni, Menglei Yuan, Huizhou Liu, Luhai Wang, An Ma
Summary: A novel hybrid material of carbon covered Fe3O4 nanoparticles and MoS2 nanoflower (FCM) was prepared by micelle-assisted hydrothermal methods. Characterization techniques including XRD, HRTEM, and XPS were used to show that FCM has superior catalytic hydrocracking activity and easy recovery by external magnetic field.
GREEN ENERGY & ENVIRONMENT
(2021)
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.