Article
Energy & Fuels
Larissa Brito, Gerhard D. Pirngruber, Emanuelle Guillon, Florian Albrieux, Johan A. Martens
Summary: The study on hydroisomerization and hydrocracking of octylcyclohexane using a bifunctional Pt/USY zeolite catalyst reveals a kinetic competition between isomerization and cracking, leading to favorable cracking distribution upon molecule tribranching.
Article
Engineering, Chemical
Nor Shafinaz Azman, Tengku Sharifah Marliza, Nurul Asikin Mijan, Taufiq Yap Yun Hin, Nozieana Khairuddin
Summary: This study aimed to investigate the potential of waste cooking oil as a green source of diesel fuel through the deoxygenation process using a Ni-Mo/AC catalyst. The results showed that sample B produced the highest yields of n-(C-8-C-20) hydrocarbon fractions.
Article
Chemistry, Physical
Qiu-Yue Nie, Zhen-Yu Ji, Yu Hu, Gong-Li Tang
Summary: Two reductases (TjhO5 and TjhD4) were identified to highly reduce the alpha,beta-unsaturated ketone of the D-ring in unconventional tetracyclines, completing the entire transformation via two distinct pathways involving different enzymatic mechanisms. TjhO5-mediated continuous reduction of C = O to CH2 possibly involved a distinctive deoxygenation mechanism. These findings highlight the unusual post-modification of tetracyclines and facilitate further engineering and biocatalysis to enrich the structural diversities.
Article
Energy & Fuels
Xinru Wu, Xueqin Lei, Shidong Wang, Hongwei Zhang, Qingyan Cui, Xiaojun Bao, Tinghai Wang, Pei Yuan
Summary: A NiP-H beta/modified Kaolin catalyst was developed and used for n-hexane isomerization. The introduction of modified Kaolin improves the selectivity towards multi-branched isomerized products with high octane number, resulting in excellent catalytic performance.
Article
Green & Sustainable Science & Technology
Ying Li, Shengli Niu, Yanan Hao, Wenbo Zhou, Jun Wang, Jiangwei Liu
Summary: This work investigates the catalytic performance of mesoporous SrTi1-xFexO3 (x = 0.05, 0.10, 0.15 or 0.20) for biodiesel production from palm oil with a high acid value. The study reveals that Fe doping increases the electron density of active sites and promotes the polarization of the perovskite structure, thereby improving the catalytic activity. The SrTi0.85Fe0.15O3 catalyst exhibits the most oxygen vacancies and achieves the highest catalytic performance, while also demonstrating strong resistance to FFAs.
Article
Chemistry, Physical
Yuxiang Mao, Jun Cheng, Hao Guo, Lei Qian, Jiacan Tu, Weijuan Yang
Summary: A bifunctional catalyst with Fe-N4 sites and Fe nanoparticles was synthesized by doping Fe in ZIF-8, which effectively enhanced the acid-base sites in ZIFs and promoted the conversion of microalgal lipids. Compared to the ZIF precursors, Fe nanoparticles and coordinated Fe ions in Fe-N4 sites increased Lewis acidity, while uncoordinated N atoms increased Lewis basicity. The adsorption energies of acetic acid on Fe-N4 and Fe NP were higher than that on the Zn-N4 site, and the energy barriers for rate-determining steps on Fe-N4 and Fe NP were lower than that on the Zn-N4 site. The maximum biodiesel yield achieved over Fe-NC catalyst was higher than that over ZIF-8 catalyst.
APPLIED SURFACE SCIENCE
(2023)
Article
Green & Sustainable Science & Technology
Ningmeng Hu, Ping Ning, Liang He, Qingqing Guan, Yuzhen Shi, Rongrong Miao
Summary: The acid-base bifunctional catalyst (CunO-Bs/SBA-15) prepared by loading boron-doped copper oxides onto SBA-15 mesoporous molecular sieve shows excellent catalytic performance in triglyceride transesterification, achieving a high biodiesel yield at near room temperature. The catalyst contains highly-dispersed acid-base sites without blocking the channels of the porous support, indicating a promising catalytic mechanism during transesterification.
Article
Green & Sustainable Science & Technology
Hewei Yu, Jichao Sun, Xiuxiu Chen, Bing Wang, Xiaohui Liang, Mingjie Gao, Hongyu Si
Summary: A novel acid-base bifunctional Zn/Ca-Zr catalyst was successfully synthesized for biodiesel production from palm oil and acidified oil. The influence of synthetic factors on the catalytic activity of resulting Zn/Ca-Zr was discussed. The FAMEs yield was optimized using the Taguchi approach, and the best activity was observed for the catalyst synthesized with a metal stoichiometric ratio of 4:4:4, hydro-thermal conditions, and an activation temperature of 850 degrees C.
Article
Energy & Fuels
Yuxiang Mao, Jun Cheng, Hao Guo, Lei Qian, Yang Xu, Jiacan Tu, Weijuan Yang
Summary: Acid-base bifunctional single-atom catalysts with Zn-Nx coordination were synthesized by pyrolyzing ZIF-8, which enhanced the acidity and basicity of the catalyst. Density functional theory calculations showed that unsaturated coordinated Zn-Nx sites exhibited lower free energies and reaction energy barriers in fatty acid esterification. The optimum catalyst exhibited a high conversion efficiency of 97.9%, better than that of ZIF-8 (85.4%).
Article
Agricultural Engineering
Hao Guo, Jun Cheng, Yuxiang Mao, Lei Qian, Yang Shao, Xiao Yang, Weijuan Yang
Summary: In this study, an acid-base bifunctional catalyst was successfully synthesized and its catalytic performance was improved through pyrolysis process. The pyrolysis process destroyed the coordination structure of the catalyst, releasing more active sites and increasing the Lewis acid/Bronsted acid ratio and basicity. Additionally, more mesopores were generated inside the catalyst, facilitating the transportation and conversion of lipid molecules. The use of this catalyst achieved higher conversion efficiency of microalgal lipids compared to traditional catalysts.
BIORESOURCE TECHNOLOGY
(2022)
Article
Chemistry, Applied
Bheechanat Duangdee, Dussadee Rattanaphra, Sasikarn Nuchdang, Anusith Thanapimmetha, Maythee Saisriyoot, Penjit Srinophakun
Summary: Solid mixed rare earth catalysts (MREEs) were synthesized by co-precipitation at different pH values. The catalysts co-precipitated at pH 12 showed high contents of active elements for facilitating esterification and transesterification reactions. The catalyst synthesized at pH 12 and calcined at 300 degrees C exhibited high catalytic activity and conversion rates in both esterification and transesterification reactions.
JOURNAL OF RARE EARTHS
(2023)
Article
Energy & Fuels
Yi-Tong Wang, Xiao-Man Wang, Di Gao, Fu-Ping Wang, Ya-Nan Zeng, Jun-Guo Li, Li-Qun Jiang, Qing Yu, Rui Ji, Le-Le Kang, Ya-Jun Wang, Zhen Fang
Summary: In this study, nanocatalysts were prepared from blast furnace dust (BFD) for biodiesel production. The synthesized catalysts showed high activity and recyclability, due to the transition of CaCO3, Na2CO3 and Fe2O3 to nanocrystals. The study found that BFD is an ideal raw material for synthesizing biodiesel catalysts with high catalytic efficiency and easy separation, providing a practical utilization of industrial solid waste.
Article
Thermodynamics
Jun Cheng, Hao Guo, Xiao Yang, Yuxiang Mao, Lei Qian, Yanxia Zhu, Weijuan Yang
Summary: A novel bifunctional heterogeneous catalyst was synthesized by modifying ZIF-67 with phosphotungstic acid to provide more acid-base active sites for catalyzing esterification and transesterification for biodiesel production. The modified catalyst exhibited enhanced Lewis acid-base properties and improved recyclability, leading to a higher conversion efficiency of microalgal lipids to fatty acid methyl ester.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Biotechnology & Applied Microbiology
Balkis Hazmi, Umer Rashid, Mohd Lokman Ibrahim, Imededdine Arbi Nehdi, Mohammad Azam, Saud Ibrahim Al-Resayes
Summary: In this study, a bifunctional magnetic nano-catalyst derived from rice husk char was successfully prepared and tested for its catalytic performance in transesterification reactions. The optimized catalyst showed high catalytic efficiency and stability, suggesting potential industrial applications.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Engineering, Chemical
Yaoyao Duan, Hui Jiang, Hefang Wang
Summary: Research focused on improving the catalytic performance of isobutane isomerization catalysts, with a particular emphasis on investigating the effects of reaction conditions on catalyst performance. Experimental results showed that the highest yield was achieved on microscale catalysts, as the larger diffusion distance inhibited cracking reactions, and increasing platinum content slightly improved n-butane selectivity.
CANADIAN JOURNAL OF 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.