Article
Chemistry, Physical
Constantinos Moularas, Pavlos Psathas, Yiannis Deligiannakis
Summary: The study utilizes electron paramagnetic resonance to distinguish the characteristics of photo-generated carriers in 14 nm and 26 nm NaTaO3 particles. The 14 nm particles exhibit higher photoinduced carrier yield, while the 26 nm particles show lower photoinduced carrier yield.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Green & Sustainable Science & Technology
Shengjun Liu, Dianjun Chi, Rong Chen, Yan Ma, Huixue Fang, Kui Zhang, Bo Liu
Summary: Inspired by natural photosynthesis, we constructed a Z-scheme heterojunction with an N-doped C layer as an electron bridge to effectively improve photocatalytic hydrogen production performance on TiO2/ZnIn2S4. The T@NC-A/ZIS-72 heterojunctions exhibited significantly higher hydrogen production activity, approximately 12.1 and 97.9 times higher than ZnIn2S4 and TiO2@NC-A, respectively. The excellent electron migration ability of the carbon layer accelerated photocatalytic hydrogen production. Our design introduces a component to provide a dedicated charge transport pathway, offering a new perspective for enhancing photocatalytic performance.
Article
Engineering, Chemical
Chaogang Ban, Yang Wang, Jiangping Ma, Yajie Feng, Junjie Ding, Youyu Duan, Xue Liu, Bin Zhang, Jinjing Tang, Xiaoping Tao, Liyong Gan, Shuangshuang Tan, Xiaoyuan Zhou
Summary: Rational fabrication of advanced photocatalysts to recycle CO2 into solar fuel is a promising approach to address energy shortages and global warming. Researchers have designed a direct TiO2 based Z-Scheme heterojunction to enhance photocatalytic activity for efficient CO2 photoreduction.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Ameen Uddin Ammar, Ipek Deniz Yildirim, Mohamad Hasan Aleinawi, Merve Buldu-Akturk, Nur Selin Turhan, Shankari Nadupalli, Arpad Mihai Rostas, Emre Erdem
Summary: The doping of Mn, Fe, and Cu ions into ZnO nanocrystals adds magnetic phenomena to their semiconducting property. However, there is a lack of research on the local lattice structure, spin-exchange phenomena, and interaction between defects and doped metal ions in TM ion-doped ZnO. This study uses multi-frequency (EPR) techniques to investigate ZnO:TM, revealing the localization of the dopant ion, site symmetry, and the formation of intrinsic-extrinsic defect complexes. The incorporation of TM ions modifies the intrinsic defect structure of ZnO nanocrystals, with the appearance of peculiar spin-exchange phenomena from intrinsic-extrinsic defect complexes, and charge selective substitutions in the matrix are observed for Cu2+ compared to Mn2+ and Fe3+.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Chemistry, Multidisciplinary
Tian Tian, Yuheng Chen, Jie Zhang, Shuolin Wang, Wen Yuan, Hongde Liu, Yaoqing Chu, Chengling Mao, Wenjie Xu, Dahuai Zheng, Jiayue Xu
Summary: A series of uranium-doped lithium niobate crystals (LN:U) were grown by the modified vertical Bridgman method, and their photorefractive properties in the visible band were systematically investigated for the first time. The occupancy of uranium ions and photorefractive centers is discussed. LN:U achieves multi-wavelength holography.
Article
Chemistry, Physical
Sam Gorman, Kirstie Rickaby, Li Lu, Christopher J. Kiely, Donald E. Macphee, Andrea Folli
Summary: This study investigates the doping of TiO2-based nanomaterials in semiconductor-sensitised photoreactions, highlighting the importance of modified band structures, energetics of band gaps, and redox potentials in enhancing light harvesting capabilities. The research demonstrates how surface chemistry of doped TiO2 nanoparticles, including surface charge density and potentials, is influenced by the nature and loading of dopants, providing insights into the role of doping in improving photocatalytic activity.
Article
Materials Science, Multidisciplinary
Elias Assayehegn, Abraha Tadese Gidey, Gebrehiwot Gebreslassie, Gebremedhin Gebremariam, Ananthakumar Solaiappan, Yonas Chebude, Esayas Alemayehu
Summary: This study successfully prepared N-doped titanium dioxide nanocrystals using a benign N-source. The annealing gas environment was found to significantly impact the crystal structure, optical properties, and photocatalytic activity of the N-TiO2 nanocrystals. The introduction of N led to improved photocatalytic performance, with the highest degradation performance achieved in air. The gas-driven synthesis of photocatalysts has practical applications in solar energy conversion systems.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Chemistry, Applied
Yue Dai, Tangtong Ju, Hailong Tang, Meiling Wang, Min Wang, Yongqing Ma, Ganhong Zheng
Summary: This study successfully synthesized a novel composite of N-doped TiO2 quantum dots tightly anchored on graphene using a one-pot method, showing superior photocatalytic performance with large specific area and superior interfacial contact via C-Ti bond.
APPLIED ORGANOMETALLIC CHEMISTRY
(2021)
Article
Environmental Sciences
Manjiri A. Mahadadalkar, NaHyun Park, Mohammad Yusuf, Saravanan Nagappan, Muthuchamy Nallal, Kang Hyun Park
Summary: Water pollution caused by industrial wastewater is a critical environmental problem. Synthetic dyes used in various industries have complex composition, high toxicity, and low biodegradability, causing negative impacts on ecosystems. To address this issue, TiO2 fibers photocatalyst doped with Fe was synthesized using sol-gel and electrospinning techniques for the degradation of dyes. The fabricated fibers showed excellent photocatalytic degradation activity, with 99% degradation of rhodamine B in 120 minutes. The fibers also demonstrated good photocatalytic activity even after 5 cycles of reuse.
Article
Engineering, Electrical & Electronic
B. Poornaprakash, K. Subramanyam, Rajesh Cheruku, Y. L. Kim, M. Siva Pratap Reddy, Vasudeva Reddy Minnam Reddy
Summary: Modern spintronic applications are actively seeking the use of diluted magnetic semiconductors with improved ferromagnetic features. The incorporation of Cr dopant and co-dopant ions (Al and Mn) into the CdS host lattice resulted in decreased energy band gap, with CdS:(Cr + Al) semiconductor showing enhanced ferromagnetic characteristics.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Chemistry, Physical
Fei Yu, Changhua Wang, Rui Wang, Yanhui Li, Bunsho Ohtani, Akira Fujishima, Xintong Zhang
Summary: In this study, surface modification of commercially available nitrogen-doped TiO2 (N-TiO2) was achieved using a solution plasma treatment to optimize the surficial electron traps. By adjusting the gas and treatment time, the energy level distribution of the traps was improved and analyzed using reversed double-beam photo-acoustic spectroscopy (RDB-PAS). The treatment enhanced the photocatalytic degradation of acetaldehyde and increased the rate of degradation by 3.2 times, by introducing shallow energy level surficial electron traps below the conduction band minimum.
APPLIED SURFACE SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Weichao Li, Liexing Zhou, Linkun Xie, Kunyong Kang, Juan Xu, Xijuan Chai
Summary: The study successfully fabricated a composite material consisting of g-C3N4 nanolayer/N, Gd, and Fe co-doped TiO2, and demonstrated that adjusting the amount of g-C3N4 nanosheets can enhance the photocatalytic performance of the composites.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Article
Chemistry, Applied
S. Cipagauta-Diaz, A. Estrella-Gonzalez, M. Navarrete-Magana, R. Gomez
Summary: BiVO4 coupled to N-Doped TiO2 composite materials were prepared using the sol-gel method assisted by microwave, showing enhanced photocatalytic activity for the degradation of pollutants in aqueous solution. The synergistic effect of N-doping of TiO2 and BiVO4 coupling improved the photocatalytic performance of the catalysts, resulting in stable heterostructures.
Article
Chemistry, Analytical
Hideo Utsumi, Toshiki Masumizu, Ryoma Kobayashi, Tomoko Tahira, Fuminori Hyodo, Tatsuya Shimizu, Tatsuya Naganuma, Kazunori Anzai
Summary: Free radicals are key substances in organisms but can also cause oxidative diseases. Dynamic nuclear polarization- magnetic resonance imaging is a noninvasive imaging method that can be used for in vivo free radical imaging.
ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Physical
Bo Yu, Lianhong Zhang, Guoping Zhang
Summary: In this study, a C/N co-doped rich-defect TiO2 photocatalyst (C/N/DBD-TiO2-x) was prepared for the first time by DBD plasma discharge treatment in the mixed atmosphere of CO, N2 and H2. The introduction of oxygen defects, C doping and N doping was successfully achieved through DBD plasma discharge treatment. This led to a reduction in the forbidden band width and efficient separation and transfer of electron hole pairs. Additionally, the DBD plasma discharge treatment increased the specific surface area, pore volume and pore size of TiO2. The visible light catalytic performance evaluation showed a degradation rate of 98.05% for MB solution. The new plasma discharge method overcomes the limitations of traditional modification methods, providing a new and more convenient technology for TiO2 modification.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Multidisciplinary
Viviana Gonzalez, Javier Frontinan-Rubio, M. Victoria Gomez, Tiziano Montini, Mario Duran-Prado, Paolo Fornasiero, Maurizio Prato, Ester Vazquez
Summary: In this paper, the synthesis and characterization of C-13-labeled graphene materials are described, as well as the investigation of their distribution in cells. The results show that after treatment with HepG2 cells, 4.1% of the dose enters the mitochondria, 4.9% enters the nucleus, and the remaining stays in the plasma membrane or culture media.
Article
Chemistry, Physical
Puning Ren, Zhuyan Gao, Tiziano Montini, Zhitong Zha, Na Ta, Yike Huan, Nengchao Luo, Emiliano Fonda, Paolo Fornasiero, Feng Wang
Summary: Biomass reforming using solar energy allows for the production of green hydrogen. Current biomass photoreforming inefficiently produces hydrogen due to intermittent solar light and incomplete degradation of biomass C-C bonds. This study overcomes these issues by converting carbohydrates into liquid hydrogen carriers (LHCs) suitable for transportation. The LHCs are then fully decomposed, releasing only H2 and CO2. By prioritizing complete scission of carbohydrate C-C bonds, this process yields 44 g of H2 per kg of glucose. This work demonstrates the production and storage of hydrogen through the complete breakdown of biomass C-C bonds.
Article
Chemistry, Physical
Luka Suhadolnik, Marjan Bele, Miha Cekada, Primoz Jovanovic, Nik Maselj, Anja Loncar, Goran Drazic, Martin Sala, Nejc Hodnik, Janez Kovac, Tiziano Montini, Michele Melchionna, Paolo Fornasiero
Summary: A versatile approach for producing cluster- and single atom-based thin-film electrode composites is described in this article. The TiOxNy-Ir catalyst developed in this study was prepared from sputtered Ti-Ir alloy with 0.8 +/- 0.2 at % Ir in alpha-Ti solid solution. The prepared catalyst exhibited high oxygen evolution reaction activity and has potential applications in electrocatalysis. The article provides a detailed description of the new method and a high-performance thin film catalyst, along with suggestions for future development in this field.
CHEMISTRY OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Daniele Spada, Marco Ambrosetti, Maria Cristina Mozzati, Benedetta Albini, Pietro Galinetto, Alberto Cini, Maria Fittipaldi, Marcella Bini
Summary: ZnFe2O4 has been prepared using different methods and its physico-chemical properties have been analyzed. The electrochemical behavior of ZnFe2O4 has been studied through various techniques, showing the relationship between electrochemical features and physico-chemical properties.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Chemistry, Multidisciplinary
Arianna Actis, Michele Melchionna, Giacomo Filippini, Paolo Fornasiero, Maurizio Prato, Mario Chiesa, Enrico Salvadori
Summary: Time-resolved EPR technique was used to study the formation of well-defined spin triplet excitons in carbon nitride. The mobility of the triplet excitons was revealed through the analysis of temperature-dependent TR-EPR signal. It was found that the energy of the spin triplet is approximately 0.2 eV higher than the conduction band edge, suggesting the inversion of singlet-triplet in carbon nitride materials. This study provides important insights into the response of carbon nitride to light and the nature of photoexcited states.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Petr Rozhin, Simone Adorinni, Daniel Iglesias, Tino Mackiol, Slavko Kralj, Matteo Bisetto, Michela Abrami, Mario Grassi, Manuela Bevilacqua, Paolo Fornasiero, Silvia Marchesan
Summary: Carbon nanostructures are modified to improve their dispersibility in aqueous conditions and favor the formation of hydrogels. The morphology and functionalization effects of the nanostructures are studied to understand their impact on the self-healing ability of the hydrogel and peptide fibrillation in aqueous buffer.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Mario Daka, Tiziano Montini, Paolo Pengo, Giovanna Marussi, Matteo Crosera, Gianpiero Adami, Juan Jose Delgado, Giuliano Giambastiani, Pierre Fertey, Emiliano Fonda, Lucia Pasquato, Paolo Fornasiero
Summary: This study describes the development of a highly active and reusable palladium-based catalyst on alumina (Pd8/Al2O3), which utilizes an octanuclear tiara-like palladium complex as the precursor to produce isolated Pd clusters of approximately 1 nm in size on Al2O3. The catalyst exhibits high specific activity, allowing for completion of the cross-coupling reaction in 30 min with only 0.12 mol % Pd loading under very mild and green reaction conditions.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Giuseppe Sportelli, Gaia Grando, Manuela Bevilacqua, Giacomo Filippini, Michele Melchionna, Paolo Fornasiero
Summary: In this study, the use of graphitic carbon nitride (g-CN) for the photocatalytic radical formylation of anilines is proposed as a sustainable and attractive alternative to current methods. The reaction occurs under mild conditions and employs air as an oxidant. The ability of g-CN to reach an excited state upon visible-light absorption plays a crucial role in triggering the formation of reactive a-amino radical species from anilines.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Giuseppe Gentile, Marc Morant-Giner, Lucia Cardo, Michele Melchionna, Paolo Fornasiero, Maurizio Prato, Giacomo Filippini
Summary: 2H-MoS2 is a promising semiconductor with earth-abundant nature, low toxicity, and low cost. Although it has demonstrated good catalytic activity in various energy-related processes, its application in catalysis for C-C bond forming reactions in organic synthesis remains largely unexplored. The challenges arise from the difficulty of using bulk 2H-MoS2 due to its low surface area, which requires high catalytic loadings for acceptable yields and makes the optimization process expensive and tedious. In this study, we developed a 2H-MoS2-mediated synthesis of valuable bis(indolyl)methane derivatives and optimized the reaction conditions using the Design of Experiments method.
Article
Chemistry, Organic
Giorgia Salerno, Bianca Cecconi, Ottavia Bettucci, Matteo Monai, Lorenzo Zani, Daniele Franchi, Massimo Calamante, Alessandro Mordini, Tiziano Montini, Paolo Fornasiero, Norberto Manfredi, Alessandro Abbotto
Summary: In this study, the synthesis and application of PTZ1-HA dye as a photosensitizer in dye-sensitized photocatalytic systems were presented. Compared to the previously studied dye PTZ1, PTZ1-HA showed improved stability in hydrogen generation due to the introduction of hydroxamic acid. Despite its lower light harvesting ability, PTZ1-HA demonstrated superior long-term efficiency, making it a promising candidate for practical applications and the commercial production of green hydrogen.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Yu Zhang, Luca Mascaretti, Michele Melchionna, Olivier Henrotte, Stepan Kment, Paolo Fornasiero, Alberto Naldoni
Summary: A fabrication approach was developed to create TiN/F-doped carbon hybrids with high catalytic activity for H2O2 production. These hybrids showed a maximum H2O2 selectivity of 90% and achieved a H2O2 productivity of 207 mmol g(TiN) (-1) h(-1) at 0.2 V vs RHE. The formation of nanocomposites played a key role in achieving high currents, with increased TiO x N y surface content promoting higher H(2)O(2) selectivity and fluorinated nanocarbon imparting good stability to the electrodes due to their superhydrophobic properties.
Article
Chemistry, Physical
Anna Lenarda, Michele Melchionna, Santeri Aikonen, Tiziano Montini, Paolo Fornasiero, Tao Hu, Michael Hummel, Juho Helaja
Summary: Activated carbons obtained from organosolv lignin were used as catalysts for aerobic oxidative dehydrogenation (ODH) reactions. The relationship between structure and activity was investigated, and the distribution of oxygen functionality was found to play a crucial role. The catalytic activity was associated with C=O surface functionalities, which was confirmed by blocking experiments. The breadth of the catalysts' applicability was explored through selected relevant ODH reactions.
Article
Nanoscience & Nanotechnology
Morteza Afshar, Andrea Schirato, Luca Mascaretti, S. M. Hossein Hejazi, Mahdi Shahrezaei, Giuseppe Della Valle, Paolo Fornasiero, Stepan Kment, Alessandro Alabastri, Alberto Naldoni
Summary: We report the development of high aspect ratio, nanoporous titanium oxynitride nanotubes with quasi-unitary broadband absorption. The efficient light-heat conversion is explained in terms of localized field distribution and heat dissipation within the nanopores. A numerical model is developed to describe the space-dependent electric permittivity distribution, which can explain the large broadband absorption observed. The potential application of these nanotubes as solar absorbers is explored through photothermal experiments.
Article
Chemistry, Multidisciplinary
Miriam Marchi, Edoardo Raciti, Sai Manoj Gali, Federica Piccirilli, Hendrik Vondracek, Arianna Actis, Enrico Salvadori, Cristian Rosso, Alejandro Criado, Carmine D'Agostino, Luke Forster, Daniel Lee, Alexandre C. Foucher, Rajeev Kumar Rai, David Beljonne, Eric A. Stach, Mario Chiesa, Roberto Lazzaroni, Giacomo Filippini, Maurizio Prato, Michele Melchionna, Paolo Fornasiero
Summary: The manipulation of carbon nitride (CN) structures through microwave treatment enhances the activity of CN-based photocatalysts for Ni dual photocatalysis. This approach improves the efficiency of C-X (X = N, S, O) couplings in organic synthesis reactions. The formation of carbon vacancies and subsequent evolution into triazole and imine N species play a crucial role in the enhanced reactivity of the material.
Review
Chemistry, Physical
Babak Jaleh, Atefeh Nasri, Mahtab Eslamipanah, Mahmoud Nasrollahzadeh, Jacky H. Advani, Paolo Fornasiero, Manoj B. Gawande
Summary: Industrialization has led to increased demand for clean energy storage and conversion systems to reduce the use of environmentally harmful substances. Nature-inspired materials, with their extended porous architectures, high surface areas, and low cost, show great potential as catalysts and nanofillers in energy storage and conversion. This review summarizes the structure and classification of natural materials suitable for energy devices, focusing on their applications and advancements in fuel cells.
JOURNAL OF MATERIALS CHEMISTRY A
(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.
