Article
Engineering, Chemical
Nirvik Sen, Debmalya Mukherjee, Krishna Kumar Singh, Shilpi Saha, Anuradha Mayya, Kalsanka Trivikram Shenoy
Summary: A vortex reactor is an important equipment in the chemical processing industry for mixing reactants through the generation of a vortex. In this work, a novel technique using ultrasonic measurements is proposed to estimate the mixing time in a vortex reactor. The dynamic variation of sound velocity in the liquid is analyzed to determine the mixing time and dynamics.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Chemical
Weiling Li, Genglin Chen, Fangfang Zhang, Jian Sun
Summary: Due to the strong alkalinity and good performance of the carbide slag, the direct aqueous mineral carbonation of the carbide slag in a bubble column at ambient conditions is evaluated. The impact of liquid to solid ratio and gas velocity on the reactions are investigated. It is found that this route has a high carbonation efficiency and short reaction time.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Environmental
Yong-Gyu Noh, Young Jae Lee, Jina Kim, Yu Kwon Kim, JungSeub Ha, Shankara S. Kalanur, Hyungtak Seo
Summary: The study proposed a new method for hydrogen production through catalytic methane pyrolysis using a multi-stage bubble column reactor with liquid metal alloy catalysts. The 3-stage bubble column reactor showed higher methane conversion rates compared to the 2-stage reactor at high temperatures. Analysis of the carbon products revealed that similar carbon-based materials can be obtained from both reactors.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Awan Bhati, Aritra Kar, Vaibhav Bahadur
Summary: This study predicts the performance of a bubble column reactor (BCR) for CO2 hydrate formation from flue gas and pure CO2 streams using a modeling framework. The study focuses on two performance parameters: gas consumption rate and conversion factor. The analysis shows that increasing pressure, decreasing temperature, and increasing CO2 mole fraction lead to higher performance parameters. This study provides a basis for the design and operation of BCRs for CO2 hydrates-based CCS applications.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
S. Mohammadzade Fard, M. Farsi, M. R. Rahimpour
Summary: The research focuses on modeling, sensitivity analysis, and multi-objective optimization of the ethylene dimerization process, showing that mass transfer controls the ethylene dimerization rate and investigating the effects of operating pressure and temperature on ethylene conversion and butene selectivity.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Article
Engineering, Environmental
Hiresh Moradi, Dong-Su Kim, Se-Hee Kim, Yoon-Young Chang, Jae-Kyu Yang, Eun-Ha Choi, Telma Kamranifard
Summary: This study used experimental and numerical analyses to model and optimize the degradation and mineralization of the pesticide diazinon using non-thermal atmospheric pressure plasma. Factors such as the initial concentration of diazinon, pH of the medium, and flow rate of the plasma feeding gas were considered. It was found that the gas composition and flow rate had significant effects on the type and concentration of reactive nitrogen and oxygen species generated. The study also identified the importance of gas flow rate in total organic carbon (TOC) removal. The energy yield of the treatment procedure was high, suggesting the potential of plasma for treating diazinon-polluted water.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Brandon Jose Leal Perez, Jose Antonio Medrano Jimenez, Rajat Bhardwaj, Earl Goetheer, Martin van Sint Annaland, Fausto Gallucci
Summary: Currently, nearly 50% of global hydrogen production is derived from Steam Methane Reforming (SMR), which leads to significant CO2 emissions and exacerbates global warming. The use of methane pyrolysis with melts of metals and salts produces less CO2 and offers a more sustainable route to generate hydrogen, with the added benefit of valuable carbon co-product sales potential. Techno-economic and sensitivity analyses suggest that the molten metal technology can compete with SMR if co-product carbon is saleable and a CO2 tax is imposed.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Hung Hai Pham, Suk Hyun Lim, Kang Seok Go, Nam Sun Nho, Eun Hee Kwon, Kwang Ho Kim, Young-il Lim, Ho-Jung Ryu, Sung-youl Park
Summary: A modeling and simulation study was conducted on slurry phase hydrocracking of vacuum residue in a bench-scale slurry bubble column reactor. The results showed better performance in hydrocracking and hydrotreating compared to a continuous stir tank reactor, and suggested optimal operating conditions for improved stability.
Article
Thermodynamics
Gomaa Sedahmed, S. A. Nosier, M. H. Abdel-Aziz, M. A. El-Naggar
Summary: In this study, the effect of upward two-phase gas-liquid flow on the rate of liquid-solid mass transfer in a bubble column equipped with a horizontal tube bundle was investigated. The presence of surfactants was found to reduce the rate of mass transfer, with the tube array highlighted for its role as a built-in heat exchanger and catalyst support.
EXPERIMENTAL HEAT TRANSFER
(2021)
Article
Energy & Fuels
Neele Uhlenbruck, Benjamin Dietrich, Christoph Hofberger, Leonid Stoppel, Thomas Wetzel
Summary: Methane pyrolysis is a promising technology for climate change mitigation by producing hydrogen from decarbonized natural gas. The future process optimization should focus on hydrogen yield, energy efficiency, carbon products, and byproduct formation. A model coupling bubble dynamics with a combustion kinetic mechanism has been developed and validated, showing good agreement with experimental data.
Article
Energy & Fuels
David Neuschitzer, David Scheiblehner, Helmut Antrekowitsch, Stefan Wibner, Andreas Sprung
Summary: This article discusses the research on methane pyrolysis in a liquid metal bubble column reactor. The study finds that temperature has a significant impact on methane conversion, while the effect of methane flow rate is relatively small. Additionally, the investigation on carbon layers covering the surface of the liquid metal column is conducted, and a comparative analysis between LMBCR and BTR is presented.
Article
Biotechnology & Applied Microbiology
Kevin Hoffstadt, Dheeraja Cheenakula, Marcell Nikolausz, Simone Krafft, Hauke Harms, Isabel Kuperjans
Summary: The increasing share of renewable electricity in the grid is driving the need for sufficient storage capacity. Power-to-gas, specifically biologically produced methane from surplus electricity, can be a promising solution for seasonal storage by substituting natural gas in the existing infrastructure. This study proposes a new reactor design, utilizing a plug flow reactor (PFR), which showed promising properties for laminar flow operation according to simulations in COMSOL Multiphysics(R). An experiment supported the simulation results and determined a gas fraction of 29% for the novel reactor. Based on these findings, a 14 m long, 50 mm diameter tube with a meandering orientation was constructed, and a step experiment determined a k(L)a of 1 h(-1). The experimental outcomes align with the theoretical simulation, indicating the potential of the new design for flexible methanation, which will be further tested.
FERMENTATION-BASEL
(2023)
Article
Mechanics
Sanaa Kouzbour, Francesco Maniscalco, Antonio Buffo, Marco Vanni, Francesc Xavier Grau, Bouchaib Gourich, Youssef Stiriba
Summary: This study investigated the effects of sodium dodecyl sulfate (SDS) surfactant on mass transfer coefficients in a square bubble column reactor. Experimental results showed that the presence of SDS increased the overall gas holdup and enhanced the gas-liquid mass transfer. Numerical simulations confirmed the accuracy of the model and agreed well with experimental data.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2023)
Article
Engineering, Chemical
Chao Zhang, Youzhi Liu, Weizhou Jiao, Hongyan Shen, Xigang Yuan, Shengkun Jia
Summary: An optimization method based on the entropy generation extremum principle is proposed to enhance gas-liquid mass transfer in a bubble column reactor. The entropy generation induced by mass transfer is maximized by increasing the mass transfer rate, and the velocity field is optimized accordingly. The objective function is the entropy generation due to oxygen mass transfer, which is the rate-limiting step in the toluene emissions biodegradation process. The conservation equations of gas-liquid flow and species concentration are applied as constraints. The optimization problem is solved using the calculus of variations, revealing the relationship between maximum mass transfer enhancement and viscous dissipation, which can improve the design of the bubble column reactor's internal structure.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Yun Shuai, Xinyan Wang, Zhengliang Huang, Jingyuan Sun, Yao Yang, Zuwei Liao, Jingdai Wang, Yongrong Yang
Summary: The study captured the bubble breakup in a jet bubbling reactor using a high-speed camera and measured the velocity field by particle image velocimetry. Two typical breakup patterns, jet breakup and jet-vortex breakup, were observed, with the latter having a significantly longer breakup time interval. Parameters such as bubble breakup frequency, average number of daughter bubbles, and daughter bubble size distribution were found to be related to factors such as bubble size and jet velocity.
Article
Biochemistry & Molecular Biology
Brian Brennan, Ciprian Briciu-Burghina, Sean Hickey, Thomas Abadie, Sultan M. al Ma Awali, Yan Delaure, John Durkan, Linda Holland, Brid Quilty, Mohammad Tajparast, Casper Pulit, Lorna Fitzsimons, Kieran Nolan, Fiona Regan, Jenny Lawler
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2020)
Review
Environmental Sciences
F. Mikaela Nordborg, Ross J. Jones, Michael Oelgemoller, Andrew P. Negri
SCIENCE OF THE TOTAL ENVIRONMENT
(2020)
Article
Engineering, Chemical
Tyler Goodine, Michael Oelgemoller
CHEMBIOENG REVIEWS
(2020)
Review
Biochemistry & Molecular Biology
Jayson S. Wau, Mark J. Robertson, Michael Oelgemoller
Summary: Photooxygenation reactions using singlet oxygen are used in industry to access oxygenated products in a mild and sustainable way. Organic dyes as photosensitizers allow these transformations to be carried out successfully using natural sunlight. Modern solar chemical reactors enable outdoor operations on a large scale, from demonstration to technical, and have been utilized for manufacturing fine chemicals like fragrances or biologically active compounds.
Article
Engineering, Chemical
Michael Sturman, Michael Oelgemoller
Summary: Ethylene is a widely used chemical compound that can replace products derived from fossil sources. Producing ethylene from atmospheric carbon dioxide can help reduce greenhouse gas concentrations. Electrochemical reduction of carbon dioxide at copper-based cathodes can produce ethylene, carbon monoxide, and ethanol.
CHEMBIOENG REVIEWS
(2021)
Review
Mechanics
Mahshid Zaresharif, Florent Ravelet, David J. Kinahan, Yan M. C. Delaure
Summary: Passive flow control techniques, including vortex generators, have been used successfully in a wide range of applications to alter boundary layer separation characteristics. These techniques can mitigate cavitation in incompressible flows by delaying and suppressing boundary layer separation. The impact of cavitation on hydraulic machinery performance can be significant and passive controls have shown positive effects on efficiency.
Article
Chemistry, Physical
Burcu Gunes, Yannick Jaquet, Laura Sanchez, Rebecca Pumarino, Declan McGlade, Brid Quilty, Anne Morrissey, Zahra Gholamvand, Kieran Nolan, Jenny Lawler
Summary: The study prepared crosslinked calcium alginate-graphene oxide beads and activated them for removal of organic pollutants, showing high adsorption capacities and adaptability. The activated beads exhibited good adsorption performance, with fitting accuracy and thermodynamic parameters playing important roles in the adsorption process.
Article
Chemistry, Physical
Michael S. A. Kamel, Michael Oelgemoller, Mohan Jacob
Summary: This study presents a method of synthesizing ultrathin encapsulation materials for organic photovoltaics (OPVs) using plant extract. The encapsulated device showed improved stability and retained a significant portion of its initial power conversion efficiency and fill factor after 90 days under ambient conditions. The open circuit voltage remained unchanged after more than 4.5 months.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Multidisciplinary
Rosilene Andrea Welter, Harrson Silva Santana, Bruna Gregatti Carvalho, Natalia Melani, Michael Oelgemoller, Lucimara Gaziola de la Torre, Osvaldir Pereira Taranto
Summary: A double immobilisation technique was developed to improve the enzymatic activity of CALB and address difficulties in lipase-catalysed reactions. The first immobilisation involved adsorption of CALB onto a TiO2 nanoparticle surface, resulting in increased enzymatic activity. The second immobilisation used calcium alginate microbeads to trap CALB(TiO2), providing high enzymatic activity and stability with easier recovery. This study presents a promising approach for enzyme immobilisation in industrial applications.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Biochemistry & Molecular Biology
Cynthia Sinyeue, Mariko Matsui, Michael Oelgemoller, Frederique Bregier, Vincent Chaleix, Vincent Sol, Nicolas Lebouvier
Summary: In this study, a series of 2,3-dihydroflavanone derivatives were synthesized and investigated for their anti-inflammatory activities. The most active compounds showed higher inhibition of NO production compared to pinocembrin, suggesting the importance of pharmacomodulation in enhancing the biological potential of natural molecules. The study also identified new bioactive flavanones as promising candidates for the development of new anti-inflammatory agents.
Article
Chemistry, Physical
Rosilene A. Welter, Harrson Santana, Lucimara G. de la Torre, Mark Robertson, Osvaldir Pereira Taranto, Michael Oelgemoeller
Summary: Methyl oleate, a fatty acid methyl ester, was successfully produced through photoesterification of oleic acid using TO and UVA light. The main operational conditions of the reaction were evaluated and optimized. The study proposed a photoesterification mechanism and described the reaction using the Langmuir-Hinshelwood kinetic model. Thermodynamic results indicated the importance of operational conditions in supplying energy and increasing reactant miscibility.
Review
Green & Sustainable Science & Technology
Michael S. A. Kamel, Ahmed Al-jumaili, Michael Oelgemoller, Mohan Jacob
Summary: Organic photovoltaics (OPVs) have emerged as a promising alternative to inorganic photovoltaics, but further improvements in efficiency are needed. This review provides a comprehensive overview of the progress in OPV performance over the past decade through the application of various inorganic nanoparticles (INPs), and analyzes the factors affecting the efficiency of OPVs.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Engineering, Chemical
Rosilene Andrea Welter, Harrson Silva Santana, Lucimara Gaziola de la Torre, Mark C. Barnes, Osvaldir Pereira Taranto, Michael Oelgemoeller
Summary: Biodiesel is a large-scale eco-friendly substitute and additive to fossil fuels. Traditional methods of production have several disadvantages, leading to the exploration of alternative feedstocks, catalysts, and operational conditions. This review analyzes current biodiesel technologies and improvement strategies.
CHEMBIOENG REVIEWS
(2023)
Correction
Chemistry, Multidisciplinary
Madyan A. Yaseen, Saira Mumtaz, Richard L. Hunter, Daniel Wall, Mark J. Robertson, Michael Oelgemoller
AUSTRALIAN JOURNAL OF CHEMISTRY
(2020)
Article
Chemistry, Multidisciplinary
Madyan A. Yaseen, Saira Mumtaz, Richard L. Hunter, Daniel Wall, Mark J. Robertson, Michael Oelgemoller
AUSTRALIAN JOURNAL OF CHEMISTRY
(2020)
Article
Chemistry, Multidisciplinary
Xuemei Liu, Chaonan Cui, Shuoshuo Wei, Jinyu Han, Xinli Zhu, Qingfeng Ge, Hua Wang
Summary: This study presents a new strategy for designing efficient photocatalysts that can convert CO2 into hydrocarbons by utilizing synergistic catalytic sites. The findings provide a solution for the selective photocatalytic reduction of CO2 to CH4.
Article
Chemistry, Multidisciplinary
Chengxian Hu, Dan Wang, Lu Wang, Ying Fu, Zhengyin Du
Summary: A novel one-pot, three-component reaction conducted under electrochemical conditions was studied. The reaction involved 2-aminothiophenols, aldehydes, and malononitrile, using TBABF4 as an electrolyte and CuI as a catalyst. The proposed reaction mechanism suggested that CuI served as an electron relay. This method offers simplified operation, high atom economy, and mild reaction conditions.
Article
Chemistry, Multidisciplinary
Zhi Yang, Yu Chen, Linxi Wan, Yuxiao Li, Dan Chen, Jianlin Tao, Pei Tang, Fen-Er Chen
Summary: A highly enantioselective method for the complete hydrogenation of pyrimidinium salts using Ir/(S,S)-f-Binaphane complex as the catalyst was developed. This method provides easy access to fully saturated chiral hexahydropyrimidines, which are prevalent in many bioactive molecules. The reactions exhibit high yields and enantioselectivities under mild reaction conditions without additives. Successful application of this methodology in a continuous flow fashion further extends its practical utility.
Article
Chemistry, Multidisciplinary
Tina Jeoh, Jennifer Danger Nill, Wujun Zhao, Sankar Raju Narayanasamy, Liang Chen, Hoi-Ying N. Holman
Summary: In this study, the enzymatic hydrolysis of cellulose was investigated using real-time infrared spectromicroscopy. The spatial heterogeneity of cellulose was found to impact the hydrolysis kinetics. Hydration affected cellulose ordering, and Cel7A preferentially removed less extensively hydrogen bonded cellulose.
Article
Chemistry, Multidisciplinary
Tiphaine Richard, Walid Abdallah, Xavier Trivelli, Mathieu Sauthier, Clement Dumont
Summary: An effective method of grafting functionalities onto lignin based on glycerol carbonate has been developed using an efficient nickel-catalysed telomerisation reaction. This method allows lignin to have new reactive functions and reduces the glass transition temperatures of modified lignins, thereby expanding the application range of lignin-based resins.
Article
Chemistry, Multidisciplinary
Jing Qi, Xiyan Wang, Gan Wang, Srinivas Reddy Dubbaka, Patrick ONeill, Hwee Ting Ang, Jie Wu
Summary: This study presents a green and environmentally friendly approach for the synthesis of imides using electrocatalytic oxidation with H2O as the oxygen source. The method eliminates the need for toxic or expensive oxidants and achieves high yields under mild reaction conditions. It shows broad substrate compatibility and potential for industrial applications.
Article
Chemistry, Multidisciplinary
Babasaheb Sopan Gore, Lin-Wei Pan, Jun-Hao Lin, Yi-Chi Luo, Jeh-Jeng Wang
Summary: Here, we report a visible light-promoted intramolecular radical cascade reaction for the construction of fluorenol and naphthalene-fused cyclopropyl carbaldehyde derivatives. This method offers mild reaction conditions, a broad substrate scope, excellent step efficiency, and scalability, without the need for external chemical oxidants. The novelty of this protocol was demonstrated by synthesizing chrysene analogs and performing late-stage functionalizations.
Article
Chemistry, Multidisciplinary
Juho Antti Sirvio, Idamaria Romakkaniemi, Juha Ahola, Svitlana Filonenko, Juha P. Heiskanen, Ari Ammala
Summary: This article discusses the method of using supramolecular interaction between an aromatic hydrogen bond donor and lignin to achieve rapid delignification of softwood at low temperatures.
Article
Chemistry, Multidisciplinary
Yunyan Meng, Chunxiang Pan, Na Liu, Hongjiang Li, Zixiu Liu, Yao Deng, Zixiang Wei, Jianbin Xu, Baomin Fan
Summary: A novel visible light-driven synthesis method for 2,3-diamines has been developed, which has mild conditions, avoids the use of metal reagents, and can synthesize diamines and diols in one pot.
Article
Chemistry, Multidisciplinary
Mingqing Huang, Haiyang Huang, Mengyao You, Xinxin Zhang, Longgen Sun, Chao Chen, Zhichao Mei, Ruchun Yang, Qiang Xiao
Summary: A direct air-oxidized strategy for the synthesis of benzo[b]phosphole oxides was developed in this study. Arylphosphine oxides were transformed into phosphinoyl radicals, which were further combined with various alkynes to achieve the desired products. DFT calculations revealed the mechanism of phosphinoyl radical formation.
Article
Chemistry, Multidisciplinary
Anwei Wang, Jiayin Huang, Chunsheng Zhao, Yu Fan, Junfeng Qian, Qun Chen, Mingyang He, Weiyou Zhou
Summary: This study demonstrates an innovative strategy for the aerobic oxidation of C(sp(3))-H bonds using gamma-valerolactone. By optimizing the reaction conditions and utilizing specific catalysts, efficient oxidation of C(sp(3))-H bonds is achieved with good chemoselectivity in certain cases.
Article
Chemistry, Multidisciplinary
Shun Li, Likai Tong, Zhijian Peng, Bo Zhang, Xiuli Fu
Summary: Sulfide compounds show promise as electrocatalysts for water splitting, but their performance is limited by factors such as limited active sites and hindered substance transport. This study successfully prepared a high-entropy sulfide (ZnCoMnFeAlMg)(9)S-8, which reduced grain size and increased specific surface area, enabling the realization of a dual-functional catalyst with multiple catalytic sites. High entropy also modulated the electronic properties of sulfides, reducing the potential energy barrier for hydrolysis. This research introduces a new approach for functionalizing high entropy nanomaterials and improves the performance of water splitting catalysts.
