Article
Chemistry, Physical
Jian Wang, Yong-Hong Song, Zhao-Tie Liu, Zhong-Wen Liu
Summary: The study found that the CrOx/silicalite-1 catalyst performs well in CO2-ODP reactions, with the highest yield obtained at a Cr loading of 2 wt.%；polymeric Cr6+ oxides were identified as the most active but least selective reaction sites；the deposited coke plays a dual role in reducing C3H8 conversion and increasing C3H6 selectivity.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Jian Wang, Min-Li Zhu, Yong-Hong Song, Zhao-Tie Liu, Li Wang, Zhong-Wen Liu
Summary: In this study, the catalytic performance of CrOx catalyst dispersed on dealuminated b zeolite was investigated using the oxidative dehydrogenation of propane with carbon dioxide as a probe reaction. The results revealed that the dispersion of Cr species and the content of initial highly-dispersed Cr6+ oxides played a crucial role in the activity of the catalyst. The researchers discovered that the oxygen from terminal Cr = O bonds in initial Cr6+ oxides reacted with propane molecules, generating coordinatively unsaturated Cr3+ oxides as active sites for the redox cycles of CO2-ODP.
JOURNAL OF CATALYSIS
(2022)
Article
Materials Science, Multidisciplinary
Yongfeng Li, Jiaojiao Su, Feng Yu, Xiaoliang Yan, Dahai Pan, Ruifeng Li, Yongxing Yang
Summary: The Co-containing catalysts supported on super-microporous Al2O3-ZrO2 with different Al/Zr molar ratios showed that the catalytic performance was highly influenced by the textural and chemical properties. Among them, the 2.5Co/AZ(0.7) catalyst with intermediate acidity, high surface area, and high metal dispersion exhibited the best performance in the dehydrogenation of ethylbenzene with CO2.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Applied
Rui Han, Jiangyong Diao, Sonu Kumar, Andrey Lyalin, Tetsuya Taketsugu, Gilberto Casillas, Christopher Richardson, Feng Liu, Chang Won Yoon, Hongyang Liu, Xudong Sun, Zhenguo Huang
Summary: Highly defective boron nitride with dispersed carbon doping shows outstanding performance in oxidative dehydrogenation reactions, attributed to the formation of carbon atomic clusters that enhance catalytic activity. Carbon doping is highly effective in defect formation and enhancing catalytic activity in oxidative dehydrogenation reactions.
JOURNAL OF ENERGY CHEMISTRY
(2021)
Article
Chemistry, Applied
Ziqi Zhang, Jinyun Xu, Yu Zhang, Liping Zhao, Ming Li, Guoqiang Zhong, Di Zhao, Minjing Li, Xudong Hu, Wenju Zhu, Chunming Zheng, Xiaohong Sun
Summary: This paper explores the challenge of increasing global CO2 emissions and highlights the role of porous metal oxide materials in electrocatalytic reduction of CO2 (CO2RR). Porous metal oxides offer high surface area and tunability for optimizing CO2RR reaction mechanisms.
JOURNAL OF ENERGY CHEMISTRY
(2024)
Article
Chemistry, Multidisciplinary
Akash Kaithal, Basujit Chatterjee, Christophe Werle, Walter Leitner
Summary: The acceptorless dehydrogenation of methanol to carbon monoxide and hydrogen using homogeneous molecular complexes, particularly those containing ruthenium and manganese with the MACHO ligand framework, showed promising catalytic activities. The metal complex was found to mediate the initial fast dehydrogenation of methanol to formaldehyde and methyl formate followed by subsequent slow decarbonylation, resulting in gas mixtures with varying CO/H2 ratios.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Applied
Shiqing Hu, Huan Li, Xue Dong, Zhongwei Cao, Bingjie Pang, Liming Zhang, Wenguang Yu, Jianping Xiao, Xuefeng Zhu, Weishen Yang
Summary: A novel garnet oxide cathode was designed for CO2 electroreduction, showing high activity and stability. Experimental characterizations and DFT calculations indicate that exsolved Fe clusters enhance intermediate adsorption and lower CO2 dissociation barriers. Microkinetic modeling confirms a dissociative adsorption mechanism for CO2RR with electronic transfer as the rate-determining step.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Chemistry, Physical
Guo-Qing Yang, Xing Ren, Vita A. Kondratenko, Heng-Bo Zhang, Evgenii V. Kondratenko, Zhong-Wen Liu
Summary: This study investigates the effects of SnO2 promoter on the activity and selectivity of Pt/CeO2 catalyst in the oxidative dehydrogenation of propane with CO2. Increasing the Sn/Pt ratio leads to a decrease in propane conversion and an increase in propene selectivity, which can be explained by the increased electron density of Pt through the promoter. The Sn-modified Pt-O-Ce bonds are identified as the active sites for the reaction, occurring via a redox mechanism involving the activation of CO2 over oxygen vacancies at Sn-modified Pt and CeO2 boundaries.
Article
Multidisciplinary Sciences
Zhishan Luo, Qiang Wan, Zhiyang Yu, Sen Lin, Zailai Xie, Xinchen Wang
Summary: The authors developed a photo-induced fluorination technique to produce an oxidative dehydrogenation catalyst by grafting fluorine atoms on nanodiamonds. The catalyst exhibited excellent performance with high ethylbenzene conversion and styrene yield, surpassing other benchmarks. The fluorine functionalization not only promoted carbon conversion and generation of graphitic layers but also increased active sites, contributing to innovative breakthroughs in carbocatalysis.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Tongqi Ye, James H. Carter, Bao Chen, Xin Li, Yuewen Ye, Stuart H. Taylor, Graham J. Hutchings
Summary: The oxidative dehydrogenation of propane to propene using carbon dioxide is a promising new synthesis route. Iron-chromia catalysts prepared by sol-gel exhibited high activity and a high concentration of acid and base sites. Despite some coking observed, the initial activity can be restored through oxidative regeneration.
CATALYSIS COMMUNICATIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Ramaraj Ayyappan, Uttam Kumar Das, Issam Abdalghani, Rosenildo C. Da Costa, Graham J. Tizzard, Simon J. Coles, Gareth R. Owen
Summary: The reaction between 6-DiPPon and [RuCl2(p-cymene)]2 resulted in the formation of two complexes with different ligands, the ratio of which can be controlled by the solvent used. In the presence of AgOTf and Na[BArF24], two other complexes were formed. The properties and reaction mechanisms of these new ligands and complexes have important implications for catalyst activity and applications.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Xueya Dai, Tianlong Cao, Xingyu Lu, Yunli Bai, Wei Qi
Summary: A dual-path dehydrogenation route was developed to convert ethylbenzene to styrene efficiently using a Pd/hollow nanocarbon spheres catalyst. The catalyst exhibited high activity and selectivity, providing a rational design strategy for efficient alkane dehydrogenation reactions.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Samira Zafarnak, Ali Bakhtyari, Hamed Taghvaei, Mohammad Reza Rahimpour, Adolfo Iulianelli
Summary: This study evaluates the carbon-dioxide-assisted dehydrogenation over alumina-supported catalysts, with particular focus on the performance of cobalt and molybdenum oxide catalysts in ethylene production. Time on steam effect on catalyst performance was also investigated.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Review
Engineering, Chemical
Sijia Xing, Sixiang Zhai, Lei Chen, Huabin Yang, Zhong-Yong Yuan
Summary: In this review, the application of carbon materials in direct dehydrogenation and oxidative dehydrogenation reactions is summarized. The mechanisms and active sites of carbon catalysts, as well as the synthesis methods and approaches for enhancing catalytic activity, are presented. The advantages of carbon materials as the support of metal-based catalysts and the challenges in current research are discussed, and strategies for future improvements are proposed.
FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Nattanida Thepphankulngarm, Thanyalak Chaisuwan, Duangkanok Tanangteerapong, Paisan Kongkachuichay
Summary: Carbon dioxide adsorption using porous materials shows promise in preventing greenhouse gas emissions and capturing these gases. This study investigated the effect of different surfactants on the morphology and CO2 adsorption capacity of polybenzoxazine-derived carbon. It was found that the type and concentration of surfactant greatly influenced the carbon morphology and adsorption efficiency.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Physical
Gabriela Mota, Jose Vitor C. do Carmo, Camila B. Paz, Gilberto D. Saraiva, Adriana Campos, Gian Duarte, Edson C. da Silva Filho, Alcineia C. Oliveira, Joao M. Soares, Enrique Rodriguez-Castellon, Elena Rodriguez-Aguado
Summary: This study examined the effects of metal incorporation into hydroxyapatites on the deactivation behavior of the solids in the esterification of glycerol reaction. The results showed that hydroxyapatites with Cu ions exhibited superior catalytic performance and reusability compared to those with Co and Ni ions. The stability of Cu ions in the hydroxyapatite lattice and the presence of isolated Cu2+ sites played important roles in enhancing glycerol conversion.
Article
Biotechnology & Applied Microbiology
Marcio J. Laranja, H. S. Francisco Junior, Gabriela A. Nogueira, Lais H. S. Vieira, Naiara C. Oliveira, Joao M. Soares, Carlos H. N. Cordeiro, Larissa Otubo, Altair B. Moreira, Odair P. Ferreira, Marcia C. Bisinoti
Summary: In this study, a magnetic carbon nanocomposite was prepared using sugar cane bagasse as a carbon source. The nanocomposite exhibited good adsorption properties and showed potential for hexavalent chromium removal.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2022)
Article
Chemistry, Inorganic & Nuclear
A. S. Soares, S. Castro-Lopes, M. Cabrera-Baez, R. Milani, E. Padron-Hernandez, B. V. Farias, Joao M. Soares, Suziete S. Gusmao, Bartolomeu C. Viana, Y. Guerra, Carla S. Oliveira, R. Pena-Garcia
Summary: This study investigated the role of pH on the vibrational, morphological, optical, and electronic properties of pure and Fe-doped ZnO nanoparticles. The results showed that pH variations affected the vibrational modes, morphology, optical band gap, and electronic properties of the nanoparticles.
SOLID STATE SCIENCES
(2022)
Article
Chemistry, Inorganic & Nuclear
R. B. da Silva, A. S. Carrico, E. D. Silva Filho, Fausthon F. da Silva, L. Bufaical, J. M. Soares, J. A. P. da Costa, J. H. de Araujo, M. A. Morales
Summary: In this study, core/shell structured CoFe2O4/CoFe2 nanoparticles were synthesized using carbothermic reduction method with chitosan beads impregnated with Fe3+ and Co2+ ions. The samples were synthesized under different conditions of temperature and atmosphere, and their structural and magnetic properties were investigated. The results showed the formation of CoFe2O4/CoFe2 nanoparticles or single phase CoFe2 nanoparticles depending on the treatment conditions, with the samples treated under N2 atmosphere exhibiting the highest saturation magnetization.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Rai F. Juca, Gilberto D. Saraiva, A. J. Ramiro de Castro, Francisco F. de Sousa, Francisco G. S. Oliveira, Igor F. Vasconcelos, G. D. S. Souza, Joao M. Soares, Carlos H. N. Cordeiro, W. Paraguassu
Summary: The synthesis and characterization of the double perovskite La2FeMnO6 was reported, revealing a refined crystal structure and magnetic properties. SEM analysis showed the sample consists of particles with quasi-spherical morphology randomly distributed in clusters. Mossbauer spectroscopy confirmed the successful incorporation of iron atoms into the structure.
Article
Chemistry, Physical
Diego S. Evaristo, Rai F. Juca, Joao M. Soares, Rodolfo B. Silva, Gilberto D. Saraiva, Robert S. Matos, Nilson S. Ferreira, Marco Salerno, Marcelo A. Macedo
Summary: Iron niobates, both pure and substituted with copper, were studied for their structural and magnetic properties. Copper ions were found to have high solubility in the structure and resulted in better structural stability. The insertion of Cu2+ ions caused an antiferromagnetic-ferromagnetic transition, leading to a weak ferromagnetic order. This transition is likely due to the increase in super-exchange interactions between Fe/Cu ions and the formation of bound magnetic polarons in the oxygen vacancies.
Article
Physics, Applied
R. F. Juca, J. M. Soares, V. A. Soares, D. S. Evaristo, F. G. S. Oliveira, I. F. Vasconcelos, G. D. Saraiva, N. S. Ferreira, M. A. Macedo
Summary: We report the magnetism of amorphous SiO2-Al2O3-CaO-MgO-Fe2O3-K2O-MnO: CA (CA-activated carbon) aluminosilicate glasses prepared by a fusion-quenching method. The presence of Fe2+ lattice modifier in the glass structures induces depolymerization, greatly affecting the magnetic transitions. Room temperature magnetization measurements reveal different magnetic behaviors, including speromagnetism, asperomagnetism, and weak ferromagnetism, in the CA-glasses. Analysis through Mo ssbauer spectroscopy at room temperature suggests that the change in valence from Fe3+-> Fe2+ triggers the asperomagnetism and weak ferromagnetism, due to Fe2+-O-Fe3+ superexchange coupling in short-range structures of the aluminosilicate glasses. A proposed model explains the different magnetic regimes in the aluminosilicate glass structures.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Ceramics
Meirielle Marques de Gois, Lucas Wagner de Alencar Souza, Carlos Henrique Nascimento Cordeiro, Isaac Barros Tavares da Silva, Joao Maria Soares
Summary: In this study, mixed magnetic composites of manganese ferrite and cristobalite (MnFe2O4-SiO2) were successfully synthesized using natural ores found in Brazil. The composites were produced by the solid-state reaction method, and their physicochemical, magnetic, and dielectric properties were studied. The results showed the formation of mixed spinel phase MnFe2O4 and SiO2-cristobalite. The size and shape of the crystallites had significant effects on the magnetization saturation and coercive field values, and the composites exhibited well-defined dielectric behavior.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Analytical
Paula Mantovani dos Santos, Ana Carla Ranucci Carneiro, Lucimara Mendonca Costa, Odair Pastor Ferreira, Francisco Holanda Soares Junior, Joao Maria Soares, Lais Helena Sousa Vieira, Eduardo Costa de Figueiredo, Marcela Zanetti Corazza, Cesar Ricardo Teixeira Tarley
Summary: This work describes a novel and highly sensitive method for the determination of cadmium at ultratrace levels. The method combines dispersive magnetic solid phase extraction (DMSPE), direct magnetic sorbent sampling (DMSS), and flame furnace atomic absorption spectrometry (FF-AAS). The method showed significantly higher analytical performance compared to other techniques, with a remarkable increase in sensitivity. Under the optimized conditions, the method demonstrated excellent accuracy and precision for cadmium determination in various samples.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2023)
Article
Materials Science, Multidisciplinary
Jose Vitor C. do Carmo, Rita de Cassia F. Bezerra, Samuel Tehuacanero-Cuapa, E. Rodriguez-Aguado, Rossano Lang, Adriana F. Campos, Gian Duarte, Gilberto D. Saraiva, Larissa Otubo, Alcineia C. Oliveira, E. Rodriguez-Castellon
Summary: A tailored nanostructured CuO-ZnO/Al2O3 catalyst was successfully synthesized via sonochemical route through core/shell assisted by reverse micelle synthesis. The catalyst exhibited high conversion and good selectivity in the oxidation of ethylbenzene.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Physical
Rita de Cassia F. Bezerra, Gabriela Mota, Ruth Maria B. Vidal, Jose Vitor do Carmo, Gilberto D. Saraiva, Adriana Campos, Alcineia C. Oliveira, Rossano Lang, Larissa Otubo, Jose Jimenez Jimenez, Enrique Rodriguez-Castellon
Summary: A facile strategy for the design of porous supports using modified sol-gel method and wet impregnation technique was developed. By adding basic promoters (MgO, La2O3, ZnO) to the gamma-Al2O3 phase, the acidity of the supports was modulated, resulting in highly porous catalysts. The catalytic performances of the solids in the esterification of glycerol were investigated, and NiCo/MgO-Al2O3 exhibited superior performance and stability.
Article
Energy & Fuels
Joao P. Nascimento, Rita de Cassia F. Bezerra, Elisabete M. Assaf, Alessandra F. Lucredio, Rinaldo S. Araujo, Gilberto D. Saraiva, E. Rodriguez-Castellon, E. Rodriguez-Aguado, Gardenia S. Pinheiro, Alcineia C. Oliveira
Summary: This study investigated the deactivation behaviors of MeMo/La2O3-Al2O3 and MeMo/Nb2O5 supported catalysts in the tri-reforming of methane (TRM). Characterization techniques were used to assess the effects of transition metal components on the causes of catalyst deactivation. The results indicated that the presence of PtMo alloy improved CH4 activation and prevented carbon accumulation in PtMo/Nb2O5, while the formation of LaPtOx[Pto]n surface oxygen species resulted in sintering of Pto particles and no oxidation of deposited carbon. The incorporation of Co in Mo/La2O-Al2O3 and Mo/Nb2O5 led to continuous reoxidation of Co species, and significant coke deposition was observed on the Nio sites of NiMo/La2O3-Al2O3 and NiMo/Nb2O5 due to Boudouard and methane cracking reactions.
Article
Materials Science, Ceramics
C. Alves, J. Matilla-Arias, F. Guerrero, S. Castro-Lopes, Y. Guerra, Bartolomeu C. Viana, E. Padron-Hernandez, Joao M. Soares, R. B. da Silva, Marcos G. Ghislandi, R. Pena-Garcia
Summary: In this study, the influence of La3+ cations insertion on the crystallography, morphology, and magnetic properties of Y3Fe5-xLaxO12 compound was investigated using the sol-gel method. The Rietveld refinement method was used to confirm the Fe3+ by La3+ cations replacement and quantify the structural parameters. The results showed that La3+ cations insertion significantly affected the lattice constant, crystallite size, microstrain, sites occupancy, bond angles and distances of the YIG crystal structure.
CERAMICS INTERNATIONAL
(2023)
Article
Spectroscopy
G. D. Saraiva, A. J. Ramiro de Castro, A. M. R. Teixeira, V. O. Sousa Neto, J. A. Lima Jr, R. F. Juca, J. M. Soares, P. T. C. Freire, F. F. de Sousa, W. Paraguassu
Summary: This study investigates the pressure-dependent Raman spectroscopic properties of a Bi2(MoO4)3 crystal and performs theoretical lattice dynamics calculations to understand its vibrational characteristics. The calculated properties are used to support the experimental Raman results and identify structural changes induced by pressure. Raman spectra were measured in a range of pressures, and changes associated with structural phase transformations were observed. Principal component analysis and hierarchical cluster analysis were employed to determine the critical pressure for phase transformations in the Bi2(MoO4)3 crystal.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Chemistry, Physical
Rita de Cassia F. Bezerra, Gabriela Mota, Ruth Maria B. Vidal, Gilberto D. Saraiva, Alcineia C. Oliveira, Antonio Joel R. Castro, Rinaldo S. Araujo, Elena Rodriguez-Aguado, Jose Jimenez Jimenez, Enrique Rodriguez-Castellon
Summary: The properties of alumina-based graphene nanocomposites were adjusted using a surfactant-mediated directed self-assembly of graphene oxide and metal oxides. The resulting nanostructured metal oxides were evaluated as catalysts for glycerol ester production. Various characterization techniques revealed the presence of nanocrystalline γ-Al2O3 phase between separated graphene lamellar nanostructures and well-dispersed Ni and Co entities on the solid surface. Addition of basic promoters did not enhance the catalytic properties of the composites, except when combined with NiCo-alumina-based graphene nanocomposites.
MOLECULAR CATALYSIS
(2023)
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.
