Article
Chemistry, Physical
Zhaohui Wu, Jie Shen, Nan Ma, Zhongfu Li, Min Wu, Difa Xu, Shiying Zhang, Wenhui Feng, Yongfa Zhu
Summary: Enhancing spatial charge separation efficiency through directional charge transfer in Bi4O5Br2 nanosheets with vertically aligned facets significantly improves the visible-light photodegradation efficiency of BPA. This study provides new insights for the rational design of photocatalyst facets to effectively separate charge carriers and enhance photocatalytic performances.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Clare Davis-Wheeler Chin, Patricia Fontenot, Taha Rostamzadeh, LaRico J. Treadwell, Russell H. Schmehl, John B. Wiley
Summary: Platinum@hexaniobate nanopeapods are a nanocomposite photocatalyst that shows improved efficiency in hydrogen production from visible light. With their unique 3D architecture, they have higher catalytic activity and hydrogen yields compared to other catalysts. This research has significant implications for efficient, versatile, and scalable hydrogen energy production.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Sheng Yin, Yifan Shao, Qingsong Hu, Yong Chen, Penghui Ding, Jiexiang Xia, Huaming Li
Summary: A Bi2O3/(BiO)2CO3 composite photocatalyst was prepared by calcinating (BiO)2CO3, showing enhanced photocatalytic activity for RhB degradation. The close contact and matching band structure between Bi2O3 and (BiO)2CO3 led to accelerated charge separation and transfer, promoting the production of reactive oxygen species and improving the photocatalytic performance. This heating treatment strategy may also benefit light absorbance and charge carriers separation for other UV-based photocatalysts.
RESEARCH ON CHEMICAL INTERMEDIATES
(2021)
Article
Green & Sustainable Science & Technology
Zhengliang Yin, Xuanxuan Zhang, Xinhua Yuan, Wenxian Wei, Yingguan Xiao, Shunsheng Cao
Summary: A novel multi-heterojunction TiO2@Bi2O3 (MHTB) hollow photocatalyst was successfully constructed in this study, which showed improved photoelectrochemical performance, excellent anti-interference capability, and stability. The formation of multiple heterojunctions facilitated faster separation and transfer of photoinduced charge carriers. This finding opens up new possibilities for developing highly active photocatalysts for efficient pollutant removal and environmental remediation.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Materials Science, Multidisciplinary
Lu Liu, Yinghua Li, Chaoqun Zhu, Jingwen Zhang, Lijun Chen
Summary: Bi2O3/BiFeO3 composites were synthesized using the co-precipitation method and were used to activate PMS for the degradation of levofloxacin hydrochloride (HCl-Lev). The physicochemical properties of the composites were controlled by adjusting the precursor pH, and their structure and morphology were characterized using various techniques. The effects of different conditions on the removal of Lev were investigated, and the optimal degradation rate was determined through response surface optimization. The main active substances in the system were identified, and a possible catalytic mechanism was proposed.
Article
Materials Science, Multidisciplinary
Heba A. Kashmery, Soliman I. El-Hout
Summary: A modified sol-gel process using Pluronic F-127 as the surfactant successfully synthesized bismuth oxide (Bi2O3). By incorporating mesoporous Bi2S3 nanoparticles onto the surface of Bi2O3, heterojunctions that enhance charge transfer and visible light absorption were formed. The content of Bi2S3 determined the effectiveness of the heterojunctions, with 3.0 wt% achieving the best photocatalytic activity for tetracycline degradation. The nanocomposite showed notable reusability and a boosted photocatalytic efficiency through a Z-scheme mechanism.
Article
Engineering, Chemical
Qi Wang, Ningyi Li, Meng Tan, Man Deng, Guoxiang Yang, Qiang Li, Hao Du
Summary: A novel dual Z-scheme Bi/BiOI-Bi2O3-C3N4 heterojunctions were successfully constructed for the photocatalytic degradation of phenolic compounds. The composite exhibited improved visible-light-response and rapid charge transfer, leading to a remarkable photocatalytic performance.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Physical
Hao Cai, Cheng Hu, Xiaolei Zhang, Shuchen Tu, Tong Li, Chunyang Wang, Hongwei Huang
Summary: In this study, we achieved remarkable piezo-photocatalytic activity over ultrathin Bi4O5I2 nanosheets and revealed the synergistic catalytic mechanism. We found that Bi4O5I2 has strong piezo-electricity through piezoelectric force microscopy (PFM) and COMSOL simulation analysis. The ultrathin nanosheets exhibited a piezo-photocatalytic efficiency for tetracycline hydrochloride (TH) degradation, which was 2.3-fold higher than the sum of single photocatalysis and piezocatalysis, and surpassed previously reported piezo-photocatalysts. Our in situ electrochemical and electron paramagnetic resonance (EPR) studies showed enhanced charge separation and transfer, as well as reactive species evolution (superoxide radicals and holes) in the piezo-photocatalytic reaction process, attributed to the piezoelectric field and band bending. This work highlights the impact of the piezoelectric field on enhancing photocatalytic performance and advancing our understanding of the synergistic piezo-photocatalytic mechanism.
APPLIED SURFACE SCIENCE
(2023)
Article
Green & Sustainable Science & Technology
Xuan-xuan Zhang, Ying-guan Xiao, Shun-sheng Cao, Zheng-liang Yin, Zhao-Qing Liu
Summary: A new confined ternary photocatalyst TiO2@Bi2O3@TiO2 was designed by embedding Bi2O3 into hierarchical hollow TiO2 spheres. This photocatalyst exhibited strong visible-light absorption and efficient charge separation, enabling the complete degradation of tetracycline under visible light. The introduction of confinement effect significantly improved the cyclic stability of the catalyst.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Chemistry, Physical
Tingwei Wang, Qian Zhu, Chen Huo, Zhengliang Yin, Qingye Shi, Junkai Tao, Fukun Su, Shunsheng Cao
Summary: Combining morphology modification with heterojunction is an effective approach to enhance the photocatalytic activity of TiO2-based photocatalysts for wastewater treatment. In this study, a novel flower-like TiO2/Bi2O3 (FTB) photocatalyst was developed by depositing Bi2O3 nanoparticles on the surface of flower-like TiO2 (FT). The successful formation of p-n heterojunction between flower-like TiO2 and Bi2O3 was confirmed, which facilitates efficient charge separation. Due to the narrow bandgap of Bi2O3 and the unique flower-like microstructure, FTB exhibits a photocurrent 1.67 times higher than that of FT, resulting in a higher photo-degradation rate (92.7%) of levofloxacin compared to FT photocatalyst (approximately 80%). Moreover, FTB demonstrates excellent anti-interference capability towards environmental factors and good cyclability. This work provides new insights into the development of TiO2-based photocatalysts with advanced performance for antibiotic removal.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Yanxia Wang, Jianping Sheng, Xiaoli Zhao, Ye He, Fan Dong, Yanjuan Sun
Summary: By constructing a (BiO)2CO3/beta-Bi2O3 heterostructure and introducing graphene quantum dots, efficient charge transfer dynamics are enhanced, leading to high activity and long-term stability for photocatalytic NO removal.
CHINESE CHEMICAL LETTERS
(2023)
Article
Chemistry, Physical
Lijia Huang, Hui Liu, Yuan Wang, Tian C. Zhang, Shaojun Yuan
Summary: In this study, an innovative ternary Bi2O3/biochar/g-C3N4 Z-scheme heterojunction was prepared as a promising photocatalyst for efficient photodegradation of tetracycline. The inclusion of conductive biochar enhanced the separation rate of photoinduced carriers. The prepared Bi2O3/biochar/g-C3N4 heterojunction exhibited a high visible-light driven photodegradation efficiency of tetracycline, surpassing other binary combinations of materials. This research offers a potential approach for the construction of high-performance Z-scheme heterojunction photocatalysts for practical wastewater treatment.
APPLIED SURFACE SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Maira Liaqat, Khalid Nadeem Riaz, Tahir Iqbal, Ghulam Nabi, Muhammad Rizwan, M. Shakil
Summary: Heterostructure BiVO4/Bi2O3 nanocomposites with enhanced visible light activity were synthesized through a hydrothermal route. The p-n heterojunction formed between the p-type Bi2O3 and n-type BiVO4 effectively reduced the recombination of photogenerated charge carriers, leading to excellent photocatalytic performance and stability.
Article
Engineering, Environmental
Weidong Wu, Yiming Sun, Haifeng Zhou
Summary: The study activated the deactivated silver bismuthate catalyst with a simple calcination method to obtain a series of bismuth and silver compounds. The ABO-290 activated at 290 degrees Celsius showed the highest degradation efficiency and apparent reaction rate constant, making it a potential highly efficient photocatalyst.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Hao Ma, Xia Yang, Xiaoning Tang, Xinyue Cao, Rong Dai
Summary: A series of beta-Bi2O3 materials with different Co doping amounts were prepared via a co-precipitation and pyrolysis process. Co doping enhanced the visible light utilization rate by reducing the band gap and improving electron-hole separation efficiency, leading to optimal efficiency for both electron-hole separation and antibacterial effect when doped with 0.4% Co. The enhanced antibacterial properties of 0.4%-CBO were attributed to increased production of reactive oxygen species (ROS), particularly center dot O-2(-), which contributed significantly to its antibacterial effect.
APPLIED SURFACE SCIENCE
(2022)
Article
Environmental Sciences
Janez Zavasnik, Andreja Sestan, Sreco Skapin
Summary: The study found that asbestos fibers may be emitted from deteriorated AC pipes due to wall softening caused by calcium leaching. The interaction of calcite scaling and Ca leaching in the conveyance of hard water through the pipes results in the emission of fibers into the drinking water.
Article
Chemistry, Physical
Tatiparthi Vikram Sagar, Janez Zavasnik, Matjaz Finsgar, Natasa Novak Tusar, Albin Pintar
Summary: Au nanoparticles supported on ZrO2 enhance the surface acidic/basic properties, leading to a high yield of methanol through the hydrogenation of CO2. The catalysts prepared by the deposition precipitation (DP) method show significant advantages over the catalysts prepared by the impregnation (IMP) method. The DP method allows for larger surface area and controlled particle size, resulting in enhanced strength and number of acidic and basic sites on the catalyst surface. The variations in surface sites due to different preparation methods greatly impact the formation of intermediates and the rapid hydrogenation to methanol via the formate route. The synergy between the metal and the support improves the rate of methanol formation.
Article
Chemistry, Physical
Neelakandan M. Santhosh, Kush K. Upadhyay, Gregor Filipic, Janez Zavasnik, Maria de Fatima Montemor, Uros Cvelbar
Summary: Portable electronic devices require high-performance miniaturised electronic components, preferably produced at low cost. Currently, aluminium electrolytic capacitors (AECs) are commonly used, but they are bulky and have narrow electrochemical performance. In this study, an alternative compact capacitor design using vertically aligned carbon nanostructures as the electrode was fabricated and showed high capacity and low resistance, suggesting its suitability for high-frequency filtering applications.
Article
Crystallography
Ivana Jelic, Aleksandar Pacevski, Aleksandar Kremenovic, Ales Soster, Andreja Sestan, Janez Zavasnik
Summary: The behaviour and stability of arsenopyrite are affected by its crystal structure, but research on crystallography and structural defects is lacking. To clarify this, natural arsenopyrite crystals from the Sumadija-Kopaonik ore district in Serbia were studied using powder X-ray diffraction (XRPD). Among them, samples from the Drenjak gold mineralisation showed near-stoichiometric FeAsS composition and were further examined using conventional and high-resolution transmission electron microscopy. The microscopy revealed the presence of abundant planar crystallographic defects and the formation of an epitaxial surface oxide layer upon air exposure. This study provides important insights into the structure and environmental stability of arsenopyrite, as well as its role in anthropogenic arsenic release into the environment.
Article
Engineering, Manufacturing
Seyed Vahid Sajadifar, Timon Suckow, Caroline Karina Chandra, Ben Heider, Akbar Heidarzadeh, Janez Zavasnik, Ruediger Reitz, Matthias Oechsner, Peter Groche, Thomas Niendorf
Summary: The impacts of different thermo-mechanical process routes on the mechanical properties, microstructure, and corrosion resistance of EN AW 7075 alloy were investigated. The focus was on a simulated forming process under two different conditions, T6 and W-Temper. Regardless of soaking time and pre-deformation, specimens quenched in water showed better mechanical properties compared to air-cooled ones. However, a shorter solution heat-treatment soaking time in the pre-deformed condition caused a decrease in elongation at fracture. Microstructural analysis revealed a high fraction of fine eta' strengthening precipitates in the specimens quenched in water, regardless of pre-deformation and soaking time.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Materials Science, Multidisciplinary
Seyed Vahid Sajadifar, Philipp Krooss, Marcel Krochmal, Thomas Wegener, Akbar Heidarzadeh, Hannes Froeck, Janez Zavasnik, Olaf Kessler, Thomas Niendorf
Summary: This study presents the effects of aging under superimposed external stress on the fatigue performance and microstructural evolution of a high-strength aluminum alloy (EN AW-7075). The combination of heat treatment and external stress, known as stress aging, accelerates the precipitation kinetics and promotes the formation and growth of strengthening precipitates. The stress aging process also reduces the dimensions of precipitate-free zones near grain boundaries. Furthermore, stress aging enhances the monotonic mechanical properties of EN AW-7075 without degrading the cyclic performance in the low-cycle fatigue regime.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Ezgi Buetev Oecal, Seyed Vahid Sajadifar, Erik P. K. Sellner, Malte Vollmer, Akbar Heidarzadeh, Janez Zavasnik, Thomas Niendorf, Peter Groche
Summary: In this study, functionally graded AA7075 components manufactured via hot stamping are investigated, with a focus on the effect of different process variables on localized microstructure evolution. The design of experiments allows for the assessment of transfer time, quenching time, and quenching media. Mechanical properties are evaluated through hardness and tensile tests. The results show that sections formed in the cooled part of the tool have higher mechanical strength and the formation of fine precipitates, while sections formed in the heated part exhibit higher ductility and the formation of coarse precipitates.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
Hue-Tong Vu, Matjaz Finsgar, Janez Zavasnik, Natasa Novak Tusar, Albin Pintar
Summary: To exploit the potential of ZrO2 and CeO2, mixed oxide catalysts were prepared and investigated in the hydrogenation of CO2. It was found that the introduction of Ce decreased CO2 conversion and the methanol selectivity was closely related to the catalysts' acidic/basic properties.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Matevz Roskari, Gregor Zerjav, Matjaz Finsgar, Janez Zavasnik, Albin Pintar
Summary: The effect of g-C3N4 melting on the photocatalytic properties of g-C3N4/TiO2 composites was investigated using two commercially available TiO2 particles. Thorough thermal treatment at 350 degrees C for a certain period resulted in partial melting and phase fusion of g-C3N4, leading to improved contact between the components. This enhanced contact allowed for easier injection of photogenerated electrons and better charge carrier separation, enhancing the performance of the composites in bisphenol A degradation under visible-light illumination.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Nitheesha Shaji, Neelakandan M. Santhosh, Janez Zavasnik, Murugan Nanthagopal, Taehyung Kim, Jae Yoon Sung, Feng Jiang, Soon Phil Jung, Uros Cvelbar, Chang Woo Lee
Summary: In this study, a binder-free composite anode with vertical carbon nanotube/molybdenum sulfide (VCNT/MoS2) hybrid nanostructures was designed to enhance the electrolyte penetration and shorten ion diffusion channels. The VCNT improves ion/electron conductivity of the electrode. The binder-free VCNT/MoS2 hybrid composite electrode exhibits superior electrochemical properties, especially high-rate capability, making it suitable for high-performing sodium-ion batteries.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Physics, Applied
Martin Kosicek, Oleg Baranov, Janez Zavasnik, Uros Cvelbar
Summary: In this study, we investigate the temperature limitations for the growth of copper oxide nanowires through thermal oxidation of copper, which has been a long-standing puzzle for scientists. By gradually lowering the oxidation temperature and using electron microscopy techniques, we determine the lowest temperature at which nanowire growth is observed and the smallest nanowire diameter achievable. Our experimental results are supported by theoretical modeling, providing insights into the nucleation processes of nanowires. The temperature dependence of the critical nucleus size governs the limiting diameter of the nanowires.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Matevz Roskaric, Janez Zavasnik, Daniel Zambo, Tomaz Kotnik, Sebastijan Kovacic, Gregor Zerjav, Albin Pintar
Summary: The present study aimed to increase the specific surface area of graphitic carbon nitride through the Simplex optimization method. The improved photocatalyst showed enhanced properties and could efficiently degrade various organic pollutants in water. The formation of singlet oxygen and superoxide anion radicals played a key role in the degradation process.
Review
Chemistry, Multidisciplinary
Janvit Terzan, Anja Sedminek, Zan Lavric, Miha Grilc, Matej Hus, Blaz Likozar
Summary: Current efforts in the decarbonisation and electrification of the chemical industry drive the interest in green production processes. The potential production processes for glucaric acid were investigated, a highly valuable biomass-derived chemical. Widespread utilization of glucaric acid would reduce carbon dioxide emissions and enable renewable production of polymers.
Article
Engineering, Environmental
Gregor Zerjav, Zafer Say, Janez Zavasnik, Matjaz Finsgar, Christoph Langhammer, Albin Pintar
Summary: TiO2+Pt plasmonic solids with 1 wt% Pt and different TiO2 supports (anatase nanoparticles (TNP), polycrystalline nanorods (a-TNR) and single-crystal anatase nanorods (TNR)) were synthesized and tested as photo, thermal and photothermal catalysts. The formation of Pt particles with different sizes, crystallinities and degrees of interaction with the TiO2 supports was influenced by the charges of the TiO2 support surfaces. The TNR+Pt catalyst showed low visible-light-triggered photocatalytic activity but exhibited the highest photothermal catalytic H2-assisted NO2 reduction rate.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Zan Lavric, Janvit Terzan, Ana Kroflic, Janez Zavasnik, Joanna Elzbieta Olszowka, Stefan Vajda, Matej Hus, Miha Grilc, Blaz Likozar
Summary: Our study presents a comprehensive approach for the selective oxidation of glucose to glucaric acid (GA) by heterogeneous catalysis. We synthesized and characterized Au/ZrO2, AuCu/ZrO2, and AuPt/ZrO2 catalysts and found that bimetallic catalysts form alloys, which exhibit different characteristics than monometallic counterparts. We also constructed a predictive microkinetic model and found that AuPt/ZrO2 showed the highest selectivity. These results provide valuable insights for the developing of efficient catalysts and point out the bottlenecks for the oxidation of glucose to GA.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
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.
