Article
Chemistry, Applied
Kunlei Wang, Kenta Yoshiiri, Lorenzo Rosa, Zhishun Wei, Saulius Juodkazis, Bunsho Ohtani, Ewa Kowalska
Summary: This study focuses on improving the photocatalytic activity and stability of gold-modified titania photocatalysts under visible-light irradiation. The modified photodeposition method is used to synthesize TiO2/Au/TiO2 composites that exhibit high photoactivity. The large gold nanoparticles are formed on rutile titania particles and partially covered with fine anatase titania nanoparticles, effectively enlarging the interface between titania and gold. Moreover, the partial coverage of gold by fine titania nanoparticles prevents gold aggregation and enhances the stability of the samples.
Article
Engineering, Chemical
Marzieh Khademalrasool, Mansoor Farbod, Mohammad Davoud Talebzadeh
Summary: Plasmonic composites of silver nanostructures and zinc oxide semiconductor exhibit enhanced photocatalytic performance, with silver cubes showing the highest increase in activity compared to other morphologies.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Marta Jimenez-Salcedo, Miguel Monge, Maria Teresa Tena
Summary: TiO2 nanoparticles were modified to obtain photocatalysts with improved visible light activity for the degradation of ciprofloxacin. The materials showed superior performance compared to pristine TiO2 nanoparticles.
Article
Thermodynamics
Aminul Islam, Siow Hwa Teo, Md. Tarekul Islam, Easteak Ahamed, Md. Shahinoor Islam, Abdulkareem Ghassan Alsultan, Hadi M. Marwani, Mohammed M. Rahman, Abdullah M. Asiri, Yun Hin Taufiq-Yap, Md. Rabiul Awual
Summary: Renewable energy sources provide more reliable and resilient alternatives to traditional sources, and biodiesel, derived from renewable resources, has a significantly lower carbon footprint. The study focused on efficient biodiesel production using visible light-irradiated Si/MgO heterojunctions and showed that Si/MgO photocatalyst exhibited superior activity. The work provided valuable insights into efficient plasmonic photocatalysis, paving the way for future advancements in high-performance photocatalysts.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Materials Science, Ceramics
Xiaoli Su, Aihui Wang, Linyuan Xu, Wei Zhang, Fumin Guo, Dafeng Zhang, Xipeng Pu, Peiqing Cai
Summary: In this study, Ag2CO3/SnFe2O4 (Ag2CO3/SFO) photocatalyst was prepared by a simple hydrothermal-ultrasonic method for the efficient degradation of ciprofloxacin and phenol. The unique 1D/0D morphology of Ag2CO3/SFO, resulting from the attachment of SFO nanoparticles on Ag2CO3 rods, increased the number of active sites. The introduction of magnetic SFO enabled excellent magnetic recovery performance and the degradation rate of ciprofloxacin using Ag2CO3/SFO was significantly higher than pure SFO and Ag2CO3.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Sheng-Hua Ma, Wei-Liang Jin, Wei Li, Hai-Yuan Wang, Li-Na Zhu, Ming Zeng, De-Ming Kong
Summary: This research demonstrates that covalent organic frameworks (COFs) can be used as promising candidates to prepare high-performance Bi/COF plasmonic photocatalysts. The prepared Bi/COF nanoheterojunctions not only show increased visible light harvesting, accelerated electron transfer, and retarded charge recombination but also maintain strong substrate adsorption capability of COFs. Moreover, the proposed Bi/COF photocatalyst works well in the visible-light photocatalytic degradation of organic pollutants.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Borbala Tegze, Emoke Albert, Boglarka Diko, Norbert Nagy, Adel Racz, Gyorgy Safran, Attila Sulyok, Zoltan Horvolgyi
Summary: In this study, mesoporous TiO2 sol-gel coatings were modified with silver using two methods, and the effects of silver modification on the functional properties were investigated. The samples made with the impregnation method showed better functional properties despite having significantly lower silver content. The pore structure influenced the Ag content achieved by the impregnation method, and subsequently affected their photoactivity.
Article
Chemistry, Multidisciplinary
Mariacristina Turino, Enrique Carbo-Argibay, Miguel Correa-Duarte, Luca Guerrini, Nicolas Pazos-Perez, Ramon A. Alvarez-Puebla
Summary: The study focuses on the cold-welding process of silver nanoparticles onto gold substrates and investigates the role of different variables in the formation of well-defined bimetallic structures. Optical and microscopy techniques are used to provide a detailed description of the nanowelding process. The findings of this extensive study are valuable for the design and engineering of bimetallic plasmonic Ag/Au structures in nanodevices.
Article
Chemistry, Physical
Dipendu Saha, Pasquale Gismondi, Kurt W. Kolasinski, Samantha L. Shumlas, Sylvie Rangan, Babak Eslami, Amy McConnell, TaeVaughn Bui, Kayla Cunfer
Summary: In this study, a composite nanofiber mat consisting of g-C3N4, gold nanoparticles (AuNPs) and polyvinylidene fluoride (PVDF) was fabricated by electrospinning. The structure and chemical properties of the mat were thoroughly investigated, revealing potential photocatalytic efficiency for applications such as dye degradation. The results showed promising performance in photocatalytic degradation of methylene blue and potential for repeated cycles.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Physical
Alessio Gabbani, Giulio Campo, Valentina Bonanni, Peter van Rhee, Gregorio Bottaro, Cesar de Julian Fernandez, Valentina Bello, Elvira Fantechi, Francesco Biccari, Massimo Gurioli, Lidia Armelao, Claudio Sangregorio, Giovanni Mattei, Peter Christianen, Francesco Pineider
Summary: Tuning the plasmonic response with an external magnetic field is an important approach to achieve active magneto-plasmonic devices. This study demonstrates a large magnetoplasmonic response of silver nanoparticles at high magnetic fields, and provides direct experimental evidence of field-induced splitting of circular plasmonic modes.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Biotechnology & Applied Microbiology
Changhua Su, Dafeng Zhang, Xipeng Pu, Zhuang He, Xun Hu, Lei Li, Guangzhi Hu
Summary: In this study, magnetically separable NiFe2O4/Ag3VO4/Ag2VO2PO4 (NFO/AVO/AVPO) heterojunction photocatalysts were successfully synthesized via a chemical etching method. The unique heterojunction structure not only allows for easy magnetic recovery, but also significantly enhances the photoactivity, particularly in terms of photodegradation efficiency for methylene blue and imidacloprid.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Nir Lemcoff, Noy B. Nechmad, Or Eivgi, Elad Yehezkel, Ofir Shelonchik, Ravindra S. Phatake, Doron Yesodi, Anna Vaisman, Aritra Biswas, N. Gabriel Lemcoff, Yossi Weizmann
Summary: Light-induced catalysis and thermoplasmonics offer innovative opportunities for research. This study presents the activation of latent ruthenium-based olefin metathesis catalysts using plasmonic gold nanobipyramids. The tunable localized surface plasmon resonance bands of the gold nanobipyramids allowed initiation of catalysts with low-energy visible and infrared light, leading to the formation of plasmonic polymer composites with exceptional properties. The method of catalyst activation through photothermal response proved to be more efficient than conventional heating methods.
Article
Engineering, Environmental
Alkadevi Verma, Shaili Pal, Jyoti Kuntail, Neha Kamal, R. K. Mandal, Indrajit Sinha
Summary: This study investigates the photocatalytic properties of Cu@Ag and Ag@Cu core-shell nanostructures for the reduction of p-nitrophenol by glycerol under dark and visible light conditions. The Cu@Ag nanoparticles showed significantly enhanced plasmonic photocatalytic activity compared to Ag@Cu nanoparticles. Density functional theory calculations and time-dependent density functional theory simulations were used to understand the electronic structure and mechanism of the core-shell nanostructures.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Ruiqi Gang, Yi Xia, Lei Xu, Libo Zhang, Shaohua Ju, Zemin Wang, Sivasankar Koppala
Summary: Ag-decorated TiO2 plasmonic photocatalysts were successfully fabricated using a facile method. The TiO2/Ag samples exhibited higher photodegradation efficiency and superior stability, which was attributed to the surface plasmon resonance effect and enhanced visible light absorption of Ag nanoparticles. A possible mechanism for the degradation of tetracycline by TiO2/Ag nanocomposites was proposed.
SURFACES AND INTERFACES
(2022)
Article
Chemistry, Physical
Xing Liu, Zhaohui Ruan, Lu Zhang, Yudong Li, Yanqiu Jiang, Jizhuang Fan, Xianzhu Xu, Yunchen Du, Yuan Yuan, Kaifeng Lin
Summary: Micro-/nanostructured materials can control light diffraction and propagation to enhance photocatalytic processes. The MoS2/CdS hybrid micro-/nanostructures exhibit high photocatalytic hydrogen production activity and long-lasting cycle stability due to enhanced absorption and utilization of light. Further investigation using FDTD simulation reveals that the cauliflower-like micro-/nanostructure increases optical absorption intensity at the MoS2/CdS interface.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Optics
Meguya Ryu, Molong Han, Lina Grineviciute, Jingwen Hu, Tania Moein, Reo Honda, Tomas Katkus, Mark J. Tobin, Jitraporn Vongsvivut, Tomas Tolenis, Yoshiaki Nishijima, Soon Hock Ng, Saulius Juodkazis, Junko Morikawa
Summary: The birefringence analysis of SiO2 films deposited at a glancing angle of 70° on resist pillar arrays and nanopatterned SiO2 substrates is carried out using spectral and color imaging modes. The films can be distinguished based on retardance and birefringence using RGB numerical analysis. By inserting a λ/2 waveplate and rotating the birefringent sample, the range of chromaticity xy-coordinates is increased, facilitating a better determination of birefringence.
LASER & PHOTONICS REVIEWS
(2023)
Article
Polymer Science
Ahmed Al-Qatatsheh, Jaworski C. C. Capricho, Paolo Raiteri, Saulius Juodkazis, Nisa Salim, Nishar Hameed
Summary: The increasing demand for reliable and reproducible protocols in predicting the properties of novel materials, particularly rapidly cured epoxy resins with additives, has emphasized the power of computational modeling and simulation to establish links between intrinsic properties and atomic structure. This study introduces a novel computational modeling and simulation protocol for crosslinking rapidly cured epoxy resin thermosets using solvate ionic liquid (SIL). The protocol combines quantum mechanics (QMs) and molecular dynamics (MDs) approaches to provide a wide range of thermo-mechanical, chemical, and mechano-chemical properties that agree with experimental data.
Article
Materials Science, Multidisciplinary
D. Gonzalez-Hernandez, B. Sanchez-Padilla, D. Gailevicius, S. Chandran Thodika, S. Juodkazis, E. Brasselet, M. Malinauskas
Summary: By studying the effect of laser exposure on materials, adjustable refractive index micro-optical devices can be manufactured with 3D nanolithography. The refractive index of micro-lenses is influenced by material density and morphology, and can be controlled through optimization of exposure. This research opens up possibilities for printing complex 3D shapes with desired refractive properties.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Analytical
Haoran Mu, Daniel Smith, Tomas Katkus, Darius Gailevicius, Mangirdas Malinauskas, Yoshiaki Nishijima, Paul R. Stoddart, Dong Ruan, Meguya Ryu, Junko Morikawa, Taras Vasiliev, Valeri Lozovski, Daniel Moraru, Soon Hock Ng, Saulius Juodkazis
Summary: Microlens arrays (MLAs) were fabricated using a femtosecond direct laser write (fs-DLW) technique, allowing high-fidelity definition of 3D surfaces on IR transparent substrates. A graphene oxide (GO) grating acting as a linear polariser was also fabricated by fs-DLW. The MLAs and GO polarisers were characterised and their performance was simulated through numerical modelling with good agreement between experimental results and simulations.
Article
Chemistry, Analytical
Jovan Maksimovic, Haoran Mu, Daniel Smith, Tomas Katkus, Mantas Vaiciulis, Ramunas Aleksiejunas, Gediminas Seniutinas, Soon Hock Ng, Saulius Juodkazis
Summary: Ultra-short 230 fs laser pulses with a wavelength of 515 nm were used to create 0.4-1 μm holes in alumina Al2O3 etch masks with a thickness of 20-50 nm, simplifying the fabrication of high-efficiency solar cells. The conditions of laser ablation and the effects of sub-surface Si modifications were studied through plasma etching, numerical modeling, and minority carrier lifetime measurements. Mask-less patterning of Si using fs laser direct writing for dry plasma etching of Si was proposed.
Review
Physics, Applied
Hamed Arianfard, Saulius Juodkazis, David J. Moss, Jiayang Wu
Summary: Sagnac interference, as a fundamental optical approach, is widely used for reflection manipulation, precision measurements, and spectral engineering. The integration fabrication techniques have enabled chip-scale Sagnac interferometers, which offer advantages in terms of reduced complexity and high stability. This paper reviews the theory, applications, and challenges of functional integrated photonic devices based on Sagnac interference.
APPLIED PHYSICS REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Eugene G. G. Gamaly, Saulius Juodkazis
Summary: The minimum laser energy required for material removal decreases with decreasing pulse duration in the sub-picosecond range. These short pulses minimize energy losses by being shorter than the electron-to-ion energy transfer and electronic heat conduction times. When the pulse duration is shorter than the ion period, conduction electrons with energy higher than the work function expel ions off the surface, leaving behind a few atomic layers of bare ions. The emission of electrons is followed by the explosion, ablation, and THz radiation of the bare ions. We compare this phenomenon with the classical photo effect and nanocluster Coulomb explosions, discuss the differences, and explore the possibility of experimentally detecting new modes of ablation through emitted THz radiation. We also consider the application of high-precision nano-machining with low-intensity irradiation.
Article
Chemistry, Multidisciplinary
Denver Linklater, Arturas Vailionis, Meguya Ryu, Shuji Kamegaki, Junko Morikawa, Haoran Mu, Daniel Smith, Pegah Maasoumi, Rohan Ford, Tomas Katkus, Sean Blamires, Toshiaki Kondo, Yoshiaki Nishijima, Daniel Moraru, Michael Shribak, Andrea O'Connor, Elena P. Ivanova, Soon Hock Ng, Hideki Masuda, Saulius Juodkazis
Summary: In this article, we provide an overview of structural and optical characterization techniques that are useful for biomaterials. These techniques allow for new insights into the structure of natural fibers, such as spider silk, with minimal sample preparation. By utilizing electromagnetic radiation over a broad range of wavelengths, information about material structure at different length scales can be obtained. Additionally, polarization analysis of optical images can provide further information on feature alignment when optical characterization is not sufficient.
Article
Chemistry, Multidisciplinary
Charitha Weerasuriya, Soon Hock Ng, William Woods, Tom Johnstone, Pranciskus Vitta, Laila Hugrass, Saulius Juodkazis
Summary: Color plays a significant role in human activities and affects the circadian cycle and decision making process. The subjective nature of color perception makes it vital to study human judgment under different colored illuminations. This study developed necessary instruments to control LED lamps with red, green, blue, and amber colors for MEG brain scans. A software was also developed to generate various colors and predefined white light combinations using RGBA color pallets. The feasibility of using LED lamps with MEG brain scanners has been validated for biomedical and psychological experiments.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Physical
Szymon Dudziak, Ewa Kowalska, Kunlei Wang, Jakub Karczewski, Miroslaw Sawczak, Bunsho Ohtani, Anna Zielinska-Jurek
Summary: Anatase nanoparticles with {0 0 1}, {1 0 0}, and {1 0 1} facets were synthesized and doped with niobium to investigate the self-trapping of excess electrons and their photocatalytic activity. The presence of excess electrons and the structure of the doped anatase samples were confirmed through structural and spectroscopic analyses. The introduced electrons were found to localize on the surface titanium sites only for the {1 0 1} facets. The dopant-introduced electrons can enhance the photocatalytic activity of anatase structures with {0 0 1} and {1 0 0} facets. The dopant effect on photocatalytic activity depends on the exposed facet.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Physics, Applied
Ran-Ran Xie, Han Zhu, Ruofei Xing, Lingrui Chu, Zhuoqun Wang, Ruyi Xia, Wenxiao Zhao, Yuechen Jia, Yanxue Chen, Saulius Juodkazis, Feng Chen
Summary: This study investigates the modulation of crystallinity and morphology of vanadium dioxide thin film using femtosecond laser direct writing. The research explores the impact of femtosecond laser conditions on the evolution of nano/micro-structures and demonstrates the ability to draw a multi-color image on a VO2 thin film. This work provides a new method for producing complex integrated multi-functional devices.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Federico Melli, Lorenzo Rosa, Luca Vincetti
Summary: Simple analytical formulas are proposed for micro-bending and surface scattering loss in Hollow-Core Tube Lattice Fibers and validated numerically. These formulas can also be applied to other Hollow-Core fibers with similar core-cladding interfaces. Scaling laws for both loss mechanisms are provided and discussed.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Quantum Science & Technology
Ahmed Al-Qatatsheh, Saulius Juodkazis, Nishar Hameed
Summary: This article discusses the challenges faced by current semiconductors and superconductors and proposes the development of a new class of organic spintronics. By utilizing materials such as ionic liquids, liquid and soft crystals, and open-shell macroradicals, organic spintronics can provide safer, faster, low-power computing and extended spin-relaxation times.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Chemistry, Multidisciplinary
Soon Hock Ng, Vijayakumar Anand, Molong Han, Daniel Smith, Jovan Maksimovic, Tomas Katkus, Annaleise Klein, Keith Bambery, Mark J. Tobin, Jitraporn Vongsvivut, Saulius Juodkazis
Summary: The FTIRm system of the Australian Synchrotron has a unique optical configuration and uses a Schwarzschild objective to focus the beam onto the sample for image scanning. In this study, the Lucy-Richardson-Rosen algorithm (LRRA) was applied for the first time in the online FTIRm system to improve image reconstruction. This new technique called coded aperture scanning holography was demonstrated with various samples for image recovery and 3D imaging applications.
APPLIED SCIENCES-BASEL
(2023)
Article
Nanoscience & Nanotechnology
Lingrui Chu, Haoran Mu, Han Zhu, Bo Wu, Weijie Liu, Saulius Juodkazis, Feng Chen
Summary: The research introduces an ultrathin titanium film between gold film and fused silica substrate to generate surface plasmon polariton waves. The femtosecond laser-SPPs patterning technique produces high quality gold nanoribbons with a width of about 270 nm and a spatial period of about 700 nm, allowing for rapid and cost-effective production of large-scale plasmonic nanostructures.
MATERIALS TODAY NANO
(2023)
Article
Chemistry, Applied
Qingyuan Zheng, Jack H. Williams, Scott Elgersma, Mick D. Mantle, Andrew J. Sederman, G. Leendert Bezemer, Constant M. Guedon, Lynn F. Gladden
Summary: In this study, a pilot-scale fixed-bed reactor compatible with NMR/MRI was developed for Fischer-Tropsch synthesis. Multiple magnetic resonance techniques were applied to quantitatively characterize different product species within catalyst pellets, providing valuable information for catalyst and reactor optimization.
Article
Chemistry, Applied
Lisa Ramisch, Sebastian Pfaff, Sabrina M. Gericke, Edvin Lundgren, Johan Zetterberg
Summary: We present a combination of optical operando techniques that allow simultaneous measurement of adsorbed species on catalyst surfaces, monitoring of surface oxide formation, and imaging of the gas phase above the catalyst surface. The experimental setup was validated by studying CO oxidation on Pd(100) at different pressures, revealing the effects of pressure on the heterogeneous catalytic reaction.
Article
Chemistry, Applied
Marta Paniagua, Gabriel Morales, Juan A. Melero, Daniel Garcia-Salgado
Summary: The influence of common impurities in levulinic acid on the catalytic performance of different acid catalysts for bio-jet fuel production was studied. It was found that furfural had the greatest detrimental effect on catalyst performance, while propyl-sulfonic acid-modified SBA-15 and sulfonic acid resin Amberlyst-70 showed good regeneration ability.
Article
Chemistry, Applied
Jesus Tapiador, Pedro Leo, Guillermo Calleja, Gisela Orcajo
Summary: This study presents a new MOF material, Zn-URJC-13, with acid and basic sites, permanent porosity, and high affinity to CO2 molecules. The Zn-URJC-13 catalyst exhibits efficient performance in CO2 cycloaddition reactions and can be reused multiple times.
Article
Chemistry, Applied
Dan Zhao, Vita A. Kondratenko, Dmitry E. Doronkin, Shanlei Han, Jan-Dierk Grunwaldt, Uwe Rodemerck, David Linke, Evgenii V. Kondratenko
Summary: This study demonstrates the potential of cheap and commercially available Zr or Ti-based supports and ZnO to serve as active and selective catalysts for propane dehydrogenation (PDH). The catalytically active species formed in situ under PDH conditions consist of isolated ZnOx. ZnOx on the surface of LaZrOx shows the highest rate of propene formation.
Article
Chemistry, Applied
Hanbyeol Kim, Jung Rae Kim, Young-Kwon Park, Jeong-Myeong Ha, Jungho Jae
Summary: In this study, metal phosphates were used as catalysts for biomass conversion to produce sustainable aromatics through DielsAlder cycloaddition reactions. The effects of synthesis method, activation method, and P/Ti molar ratio on the structure and acid properties of titanium phosphate catalysts were systematically studied. The mesoporous titanium phosphate catalyst synthesized by hydrothermal method at 180℃ for 12 h followed by ethanol refluxing at 60℃ for 24 h at a molar P/Ti ratio of 1 showed the highest surface area and acid site density.
Article
Chemistry, Applied
Yasin Khani, Sumin Pyo, Kwang-Eun Jeong, Chul-Ung Kim, Moonis Ali Khan, Byong-Hun Jeon, Kun-Yi Andrew Lin, Siyoung Q. Choi, Young-Kwon Park
Summary: A protonated form of Zeolite Socony Mobil-5 (H-ZSM-5) catalyst was synthesized through a hydrothermal method using different sources of silica. The effect of loading the catalyst with yttrium, samarium, and gadolinium on the acidic properties was investigated. Among the metal-loaded catalysts, the Sm/LHZ catalyst showed the best performance in the methanol to propylene conversion due to its high amount of weak and intermediate acid sites, while the Gd-LHZ catalyst increased the selectivity towards ethane and propane.
Article
Chemistry, Applied
Michael Franc, Ivana Cisarova, Jan Vesely
Summary: The present study investigates an enantioselective cyclization of enals with imidazolone derivatives catalyzed by a combination of achiral Pd(0) complex and chiral secondary amine. Corresponding spirocyclic imidazolones were produced in high yields with moderate diastereoselectivity and excellent enantioselectivity. The developed co-operative catalytic methodology provides a highly substituted spirocyclic scaffold with four stereogenic centers under mild conditions.
Article
Chemistry, Applied
Mauro Alvarez, Jennifer Cueto, David P. Serrano, Pablo Marin, Salvador Ordonez
Summary: This study focuses on improving the formulation and preparation methods of catalysts for the production of dimethyl carbonate. By using suitable catalyst preparation methods and copper salt precursors, the researchers successfully produced catalysts with optimal performance for dimethyl carbonate formation.
Article
Chemistry, Applied
Claudia J. Keijzer, Luc C. J. Smulders, Dennie Wezendonk, Jan Willem de Rijk, Petra E. de Jongh
Summary: This study investigates the catalytic behavior of alpha-alumina supported silver catalysts in the presence of chloride. It is found that the particle size of silver can affect the selectivity of the catalyst, but different strategies lead to different results. In this size range, the selectivity of ethylene oxide is correlated to the Ag : Al2O3 surface ratio.
Article
Chemistry, Applied
Takeshi Aihara, Wataru Aoki, Michikazu Hara, Keigo Kamata
Summary: The development of acid-base bifunctional catalysts is important for promoting specific chemical transformations. In this study, Ti-based perovskite oxides were synthesized and used as catalysts for two C-C bond-forming reactions (cyanosilylation and Knoevenagel condensation). The highly pure SrTiO3 nanoparticles with a high specific surface area exhibited the highest catalytic performance, and could be easily recovered and reused.
Article
Chemistry, Applied
Olga Gorlova, Petra Pribylova, Eliska Vyskocilova, Katerina Peroutkova, Jan Kohout, Iva Paterova
Summary: This study investigates the Baeyer-Villiger oxidation of beta-cyclocitral using tin-modified mixed oxides as catalysts. The optimal reaction conditions and the effects of various factors on the reaction course and selectivity were determined. The results show that tin-modified mixed oxides exhibit high activity and selectivity in the oxidation reaction.
Article
Chemistry, Applied
M. I. Avila, M. M. Alonso-Doncel, L. Briones, G. Gomez-Pozuelo, J. M. Escola, D. P. Serrano, A. Peral, J. A. Botas
Summary: The catalytic fast pyrolysis of lignin using ion-exchanged zeolite catalysts showed significant improvements in bio-oil quality and the production of aromatic hydrocarbons and oxygenated compounds.
Article
Chemistry, Applied
Enrico Catizzone, Giorgia Ferrarelli, Paolo Bruno, Girolamo Giordano, Massimo Migliori
Summary: The acid-catalysed alcohol conversion reaction is a promising route for de-fossilization strategies. Research on pure alcohol conversion and simultaneous dehydration of mixed alcohols have shown different product compositions, with the type and distribution of acid sites affecting the reaction mechanism.
Article
Chemistry, Applied
Alireza Ranjbari, Juho Kim, Jihee Yu, Jiyun Kim, Mireu Park, Nayoung Kim, Kristof Demeestere, Philippe M. Heynderickx
Summary: This study investigated a novel kinetic model for the adsorption and photocatalytic degradation of methyl orange using commercial ZnO and reduced ZnO photocatalysts. The results provided new insights into the interaction of catalysts with molecules of different charges and compared with a previous study on methylene blue. The presence of oxygen vacancies in ZnO and their effects on adsorption and photocatalytic degradation were analyzed, and the photocatalytic degradation rate of reduced ZnO was found to increase significantly.
