Article
Chemistry, Physical
Tobias F. Kimpel, Jin-Xun Liu, Wei Chen, Robert Pestman, Emiel J. M. Hensen
Summary: Through IR spectroscopy and DFT calculations, it has been discovered that in the Fischer-Tropsch reaction, Mn promotes a silica-supported Co catalyst with a MnO layer covering the Co surface, activating adsorbed CO through reaction with an oxygen vacancy. This results in higher activity, higher CHx coverage, increased C5+ selectivity, and decreased CH4 selectivity. Increasing pressure amplifies the selectivity differences. However, above around 4 bar, the addition of Mn decreases C5+ selectivity, possibly due to its promotion of C-O bond dissociation but not chain growth. Migration of formed monomers for chain growth on the Co surface may be hindered by high CO coverage, especially at high pressure.
JOURNAL OF CATALYSIS
(2023)
Article
Energy & Fuels
Shupeng Guo, Zhongyi Ma, Jungang Wang, Bo Hou, Litao Jia, Baojun Wang, Debao Li
Summary: The synergistic promotion effect of Ru and Ba in Co/Al2O3 catalyst achieved higher CO conversion and lower CH4 selectivity, compared to unmodified or single additive modified catalyst. The influences of other alkali earth metal additives were also similar to that of Ba in promoting FTS reaction on Co-Ru catalysts.
Article
Chemistry, Physical
Malayil Gopalan Sibi, Muhammad Kashif Khan, Deepak Verma, Wonjoong Yoon, Jaehoon Kim
Summary: This study presents a tandem catalyst that can efficiently convert CO2 to BTEX. The selectivity of the catalyst towards the desired products was controlled by adjusting the nature of the acid sites in the zeolite and the proximity between the Fe-based and zeolitic active sites. In situ operando experiments revealed the role of the catalyst in multiple reaction steps.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Physical
Xiaoxu Ding, Minghui Zhu, Yi-fan Han, Zixu Yang
Summary: Fe-Mn bimetallic catalysts prepared by different methods showed different catalytic performance and product distribution. Fe4Mn1-SCM catalyst exhibited higher selectivity and stability compared to Fe4Mn1-CP catalyst, which was attributed to the abundant interfacial Fe-MnOx structure.
JOURNAL OF CATALYSIS
(2023)
Article
Chemistry, Physical
Deizi Peron, Alan J. Barrios, Alan Taschin, Iulian Dugulan, Carlo Marini, Giulio Gorni, Simona Moldovan, Siddardha Koneti, Robert Wojcieszak, Joris W. Thybaut, Mirella Virginie, Andrei Y. Khodakov
Summary: The study found that antimony and tin have strong promoting effects on silica supported iron Fischer-Tropsch catalysts, significantly increasing the reaction rate and improving catalyst stability. The addition of these elements through impregnation can increase the intrinsic activity of iron surface sites by 7-10 times without affecting iron dispersion.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Omid Akbarzadeh, Solhe F. Alshahateet, Noor Asmawati Mohd Zabidi, Seyedehmaryam Moosavi, Amir Kordijazi, Arman Amani Babadi, Nor Aliya Hamizi, Yasmin Abdul Wahab, Zaira Zaman Chowdhury, Suresh Sagadevan
Summary: In this study, the effect of reaction temperature, syngas space velocity, and catalyst stability on Fischer-Tropsch reaction using Co-Mn/CNT catalysts was investigated. Results showed that optimizing the temperature, space velocity, and H2/CO ratio led to increased CO conversion and C5+ selectivity. Additionally, the 95Co5Mn/CNT catalyst demonstrated better stability over 48 hours of continuous operation compared to other catalyst formulations.
Article
Chemistry, Physical
Ting Wang, Yuebing Xu, Yufeng Li, Lei Xin, Bing Liu, Feng Jiang, Xiaohao Liu
Summary: This study reports the use of Na-mediated bimetallic Fe-Ni catalyst simply mixed with HZSM-5 to enhance the stable and selective production of aromatics from syngas. The addition of Ni with Na substantially regulates iron carbide formation and suppresses carbon deposition, leading to increased selectivity to light alpha-olefins. The presence of Na weakens the Fe-Ni interaction, reduces electron transfer from Fe to Ni, and promotes the formation of lighter olefins, demonstrating the potential for developing stable and selective iron-based catalysts for the production of FT products.
Article
Chemistry, Physical
Yanbing Li, Yingluo He, Kensei Fujihara, Chengwei Wang, Xu Sun, Weizhe Gao, Xiaoyu Guo, Shuhei Yasuda, Guohui Yang, Noritatsu Tsubaki
Summary: In this study, a core-shell structured Na/Fe@Co bimetallic catalyst was developed to enhance CO2 conversion and selectivity of light hydrocarbons, while inhibiting CO selectivity. Characterization analyses revealed that the introduction of CoCo Prussian Blue Analog (CoCo PBA) increased the reducibility of iron oxide, accelerated the formation of iron carbide, and adjusted the surface basic properties of the catalyst. Additionally, trace Co atoms acted as a second active center in the CO2 Fischer-Tropsch synthesis process for increasing the synthesis of light hydrocarbons from CO hydrogenation. This work provides a novel core-shell structured bimetallic catalyst system for the production of light hydrocarbons, particularly light olefins, from CO2 hydrogenation.
Article
Chemistry, Applied
Yulan Zhang, Xizhu Lin
Summary: Fischer-Tropsch synthesis is a non-petroleum-based alternative route for producing liquid fuels. By tuning the position of the SiO2 shell, stable core-shell catalysts were designed to improve catalytic activity and selectivity. Among them, the FeSiMn catalyst showed the best performance, which may be attributed to the improved spillover effect.
JOURNAL OF POROUS MATERIALS
(2022)
Article
Energy & Fuels
Chao Wang, Huaqing Zhu, Juan Zhang, Zhijun Huang, Jiangang Chen
Summary: A series of Fe-Mn bimetallic catalysts with different pretreatment atmospheres were used for the Fischer-Tropsch synthesis (FTS). The structure of Fe-Mn bimetallic catalysts was analyzed and the effect of different pretreatment atmospheres on reduction efficiency was investigated. It was found that nitrided Fe-Mn catalysts exhibited better stability and higher light olefin selectivity.
Article
Chemistry, Applied
Pauline Bredy, Ludovic Fine, David Farrusseng, Yves Schuurman, Frederic C. Meunier
Summary: In situ and operando diffuse reflectance FT-IR (DRIFTS) studies often require consideration of changes in optical properties. This study investigated the variation of IR optical pathlength of Fe and Co-based Fischer-Tropsch catalysts by using an internal standard CaCO3 mixed with the catalyst. The results showed the importance of considering changes in optical pathlength for quantitative DRIFTS analysis.
Review
Engineering, Environmental
Kyoung-Jin Kim, Kwang Young Kim, Geun Bae Rhim, Min Hye Youn, Yeol-Lim Lee, Dong Hyun Chun, Hyun-Seog Roh
Summary: Gas-to-liquids (GTL) technology has gained attention as a commercial process to produce clean fuels and petrochemical products from natural gas, which can be a competitive alternative during high oil prices. This review focuses on the nano-catalyst technology that enhances the efficiency of GTL in the methane reforming and Fischer-Tropsch synthesis (FTS) steps. It discusses the development of tailored catalysts for reforming and FTS, along with thermodynamics and kinetics, highlighting the importance of H2/CO ratio optimization and the use of CeO2 and Ru noble metal in the catalyst design.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Amin Einbeigi, Hossein Atashi, Seyyed Hossein Zohdi, Ali Akbar Mirzaei, Neda Poudineh
Summary: In this paper, the effects of operating conditions on CO hydrogenation reactions using a gamma-Al2O3 supported Fe-Co bimetallic nanocatalyst were investigated. Statistical-based selectivity models and response surface methodology were used to determine the optimum conditions for maximizing olefin production and minimizing CH4, paraffin, and carbon dioxide production. Increasing H-2/CO ratio, pressure, and temperature resulted in decreased olefin selectivity and increased selectivity for paraffin, CH4, and carbon dioxide. SEM and BET techniques were employed to characterize the catalyst.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Applied
Sania Saheli, Ali Reza Rezvani, Azadeh Arabshahi, Michal Dusek, Erika Samolova, Marketa Jarosova
Summary: The preparation methods of two new catalysts for Fischer-Tropsch synthesis were studied, with the catalyst prepared via thermal decomposition showing higher activity due to its smaller particle size, better dispersion, and higher surface area. The catalyst obtained by impregnation method exhibited lower activity compared to the one prepared by thermal decomposition.
APPLIED ORGANOMETALLIC CHEMISTRY
(2021)
Article
Engineering, Chemical
Ziwei Wang, Hao Wang, Chengguang Yang, Sheng Wang, Peng Gao, Yuhan Sun
Summary: Bifunctional catalysts using hierarchical ZSM-5 zeolite as a support have attracted attention for their ability to produce middle distillate hydrocarbons in Fischer-Tropsch synthesis. The hierarchical ZSM-5 zeolites with varying acidities and mesopore volumes are synthesized by treating zeolites with TPAOH solution, leading to enhanced CO conversion and production of heavier hydrocarbons with increased cobalt loading.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Green & Sustainable Science & Technology
Komal Tripathi, Vrinda Gupta, Kamal Kishore Pant, Sreedevi Upadhyayula
Summary: Methanol produced from coal derived CO2 rich syngas can be a sustainable alternative to conventional crude oil based fuels for reducing greenhouse gas emissions. In this study, Cu-Zn-Mn oxide catalysts with different Mn loadings were synthesized to investigate the effect of Mn-promoted malachite precursors on the micro structural properties of the catalyst. The results showed that incorporating 20% Mn in malachite lattice improved the stabilization and dispersion of CuO domains, leading to increased CO conversion and methanol selectivity. However, Mn loading beyond 20% had a detrimental effect on the catalytic efficiency.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Green & Sustainable Science & Technology
Shashank Bahri, Shailesh Pathak, Akshdeep Singhahluwalia, Puneet Malav, Sreedevi Upadhyayula
Summary: This study reviews the literature data on the catalytic reaction of CO2 hydrogenation using a meta-analysis approach. It analyzes the performance characteristics of various catalysts under different reaction conditions and proposes that promising catalysts must have the functionality to form stable carbonates through a machine learning model.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Chemistry, Physical
Aloka Kumar Sahu, Meenakshi Pokhriyal, Sreedevi Upadhyayula, Xiu Song Zhao
Summary: The study investigates the impact of different crystal facet structures of Cu2O on the charge separation efficiency of photocatalysts through computational simulations and experimental validation. It demonstrates that edge-truncated cubic Cu2O exhibits higher charge separation efficiency and elucidates the mechanism behind the influence of facet structure differences on electronic band structure and charge separation.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Engineering, Environmental
S. C. Tiwari, A. Bhardwaj, K. D. P. Nigam, K. K. Pant, S. Upadhyayula
Summary: This article comprehensively reviews various factors that are recently being considered in determining the best absorbent selection for CO2 absorption. The merits and demerits of physical and chemical absorbents are discussed, along with the methods used to determine their structural, transportation, and chemical properties. The importance of mass transfer coefficients and the advantages of circular microchannel reactors in improving mass transfer coefficients are emphasized. The interaction mechanism of reactive absorbents and the relative cost of the absorption processes are also discussed.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Materials Science, Multidisciplinary
Chitrangda Singh, Chandan Bhogendra Jha, Navneet Kumar, Ragini Singh, Himanshu Ojha, Sreedevi Upadhyayula, Raunak Varshney, Rashi Mathur
Summary: This study synthesized ZIF-8 and conducted simulation studies to gain a comprehensive understanding of the drug's interactions with ZIF-8. Experimental and computational results revealed the adsorption mechanism and energy interactions between the drug and the MOF framework, providing guidance for the design of new metal-organic ligand drug carriers.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Engineering, Chemical
Minaz Makhania, Sreedevi Upadhyayula
Summary: This article critically reviews the applications of solid foam in heterogeneous catalysis and compares its performance with conventional catalysts. The preparation techniques of foam-based catalysts and methods for performance modeling are also discussed. The article identifies the gaps in current research and recommends expanding the use of foam-based catalysts to a wider class of reactions by applying innovative methods. Perspectives on expanding the modeling with solid foam-based catalysts are also presented.
CHEMBIOENG REVIEWS
(2022)
Article
Chemistry, Physical
Sachin Tomar, Sreedevi Upadhyayula
Summary: Developing an active, stable, and cost-effective catalytic system for gas-phase SO3 reduction in the Sulfur-Iodine cycle is crucial for large-scale implementation. A copper ferrite catalyst supported on b-SiC foam was synthesized and characterized using various techniques. The conversion of SO3 was evaluated at temperatures of 800-900°C and a WHSV (weight hourly space velocity) of 8.1 h-1. Stability tests were conducted for 300 hours at 850°C and 8.1 h-1 WHSV. The catalytic performance of the b-SiC foam supported copper ferrite catalyst was found to be excellent in this highly endothermic and corrosive reaction.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Vaibhav Pandey, Rajan Singh, Kamal K. Pant, Sreedevi Upadhyayula
Summary: Syngas conversion to methanol in the slurry reactor requires selecting the suitable solvent. The activity test was conducted in a stirred tank slurry reactor with three different solvents (paraffin, diglyme, and DMSO) and CuZnO catalyst. Diglyme showed higher CO conversion and methanol selectivity compared to paraffin and DMSO. The role of solvents in CO adsorption on Cu(111) was studied by DFT combined with the COSMO model.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Multidisciplinary
Vaibhav Pandey, Kamal K. Pant, Sreedevi Upadhyayula
Summary: In this study, Cu-based catalysts with ZnO/MgO were prepared using the solvent combustion method, and the activity of CO hydrogenation to methanol in a slurry reactor was tested. The addition of ZnO and MgO was found to promote the physicochemical and structural properties of Cu catalysts, leading to an enhancement in catalytic activity for methanol synthesis.
REACTION CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Physical
Shashank Bahri, Shailesh Pathak, Sreedevi Upadhyayula
Summary: This study systematically investigated the kinetics of CO consumption in a Fischer-Tropsch and water-gas shift reaction network over a supported FeCo2O4 spinel catalyst. The results revealed the hydrogen-assisted cleavage of the C-O bond through the formation of formyl (HCO) species as the main route for hydrocarbon chain initiation in the Fischer-Tropsch process. Six reaction mechanisms comprising Fischer-Tropsch and water-gas shift rate expressions were developed and validated. The precision of the predicted data in the comprehensive model was higher compared to other literature-reported models, indicating its reliability.
SUSTAINABLE ENERGY & FUELS
(2023)
Article
Chemistry, Multidisciplinary
Avan Kumar, Kamal K. Pant, Sreedevi Upadhyayula, Hariprasad Kodamana
Summary: Methanol production is important for renewable fuel and hydrogen energy storage. Machine learning techniques, particularly Gaussian process regression, are used to model and predict the conversion of CO and selectivity of methanol. This helps to optimize the production process.
Article
Green & Sustainable Science & Technology
Komal Tripathi, Vrinda Gupta, Varsha Awasthi, Kamal Kishore Pant, Sreedevi Upadhyayula
Summary: This study develops an ultrafast machine learning (ML) based framework to predict CO2 conversion and methanol selectivity by extracting comprehensive knowledge from existing published literature. Among various ML algorithms, artificial neural networks (ANNs) exhibit the best accuracy. The efficacy and fidelity of the developed neural networks are depicted by satisfactory performance for majority of unseen test datasets. This work concludes that ML-based concept allows to uncover catalytic property-performance correlations hidden in existing experimental research.
ADVANCED SUSTAINABLE SYSTEMS
(2023)
Article
Engineering, Chemical
Komal Tripathi, Vrinda Gupta, Varsha Awasthi, Kamal Kishore Pant, Sreedevi Upadhyayula
Summary: A comprehensive thermodynamic study was conducted to compare the efficiency of methanol and dimethyl ether (DME) synthesis using CO2 enriched syngas feed. The study found that one-step DME synthesis using co-gasification derived syngas is the most viable process. Additionally, process design of a 1 ton per day (TPD) DME plant achieved significant CO2 abatement and high purity DME production with minimum energy consumption.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Review
Chemistry, Physical
Aloka Kumar Sahu, Xiu Song Zhao, Sreedevi Upadhyayula
Summary: The design and application of semiconductor-based photocatalytic technology have significant impacts on addressing the world's energy crisis and environmental degradation. Ceria (CeO2), a semiconductor-based photocatalyst, has unique properties and is superior to other metal oxide semiconductors. This review provides a detailed understanding of the mechanistic details, methods for boosting activity and stability, and various photocatalytic applications of CeO2. The challenges and potential areas for future research in the synthesis of CeO2-based photocatalysts are also discussed.
CATALYSIS REVIEWS-SCIENCE AND ENGINEERING
(2023)
Article
Energy & Fuels
Kaisar Ahmad, Maguy Abi Jaoude, Sreedevi Upadhyayula, Kyriaki Polychronopoulou, Florent Ravaux
Summary: In sustainable aviation fuel development, the catalytic approach for CO2 hydrogenation to methanol can be influenced by side reactions. To improve process efficiency and product quality, a new microkinetic modeling approach combining the UBI-QEP method and the LHHW technique is proposed. The model predicts the reaction pathways and calculates the adsorption heat values and activation barriers, providing insights into the role of active sites in CO2 hydrogenation catalysts.
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.