Article
Environmental Sciences
Mojtaba Ghiassee, Mehran Rezaei, Fereshteh Meshkani, Sajad Mobini
Summary: Mn/Co mixed powders prepared by coprecipitation method showed excellent catalytic performance in low-temperature CO oxidation, with the best performance observed at a Mn/Co molar ratio of 1:1. Incorporation of 1wt.% Pd further enhanced the catalytic activity, with the catalyst exhibiting 100% CO conversion at 80 degrees C.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Review
Chemistry, Applied
Rose Mary Philip, Sankaran Radhika, C. M. Afsina Abdulla, Gopinathan Anilkumar
Summary: Epoxidation of alkenes is an important reaction in organic chemistry with significant potential in producing biochemically relevant compounds. Recent studies have focused on catalytic epoxidation using homogeneous manganese catalysts, particularly with porphyrin, Schiff base, Salen, and other ligands, showing advantages in green chemistry. The use of greener approaches, such as photo-catalysis, has been highlighted in recent reports, aiming to provide researchers with a better understanding of the reaction and catalyst selection.
ADVANCED SYNTHESIS & CATALYSIS
(2021)
Article
Chemistry, Physical
Raziyeh Jokar, Seyed Mehdi Alavi, Mehran Rezaei, Ehsan Akbari
Summary: The study found that the 10wt% CuO/MnO2 catalyst exhibited the best catalytic performance in CO preferential oxidation reaction, attributed to the synergistic interaction between copper and manganese. However, adding CO2 and/or H2O to the feedstock decreased the catalyst performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Green & Sustainable Science & Technology
Ya Cheng, Weiyao Xiong, Tinglin Huang, Gang Wen
Summary: Due to the low efficiency of catalytic oxidation of ammonium and manganese in high alkalinity groundwater by manganese oxide filter column, the effect of doping copper (Cu) and cobalt (Co) on catalytic activity was investigated. The results showed that low Cu doping increased the ammonium removal efficiency while decreasing the manganese removal efficiency. Low Co doping was beneficial to the start-up period of the filter column. The study also revealed the formation of calcium carbonate on the surface of the filter media due to the high alkalinity of the water, which was found to affect the catalytic activity of manganese oxide filter media.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Chemistry, Physical
Rahul Purbia, Yeong Min Kwon, Sung Yeol Choi, Sang Heon Kim, Yun Sik Lee, Zehra Betul Ahi, Hyesung Park, Jeong Min Baik
Summary: By incorporating Nb2O5 nanoparticles, this study has achieved reversible, selective, and stable detection of H2S gas using CuO nanoparticles in the temperature range of 100-220 degrees Celsius, with ultralow detection concentration, fast response, and long-term stability.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Engineering, Environmental
Cuicui Hao, Wenzong Huang, Jia Zhang, Jianzhong Wu, Yang Yue, Guangren Qian
Summary: A highly efficient catalyst was synthesized from manganese slag for the valorization of heavy-metal-containing waste; the monolithic catalyst showed excellent performance in removing volatile organic compounds in real applications; the loss of activity was attributed to the disappearance of manganese-oxygen bonds, which highlighted the significance of recycling economy and green development.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Jiaquan Li, Shiyong Zhao, Claudia Li, Sibudjing Kawi, Kai Wang, Jun Huang, Shaomin Liu
Summary: In this study, a facile and environmentally benign technique for liquid phase selective oxidation based on graphene-supported Mn single-atom-catalyst (SAMn-G) was demonstrated. The SAMn-G catalyst exhibited superior conversion and aldehyde selectivity, converting aromatic alcohols into aldehydes or ketones.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Chemistry, Physical
Pradip Ramdas Thorve, Biplab Maji
Summary: A bioinspired catalytic system was developed for the one-pot cascade oxidation of a native primary amine and an in situ generated non-native secondary amine, yielding quinazolin-4(3H)-ones commonly found in pharmaceuticals and bioactive compounds in high yields. The detailed kinetic and mechanistic study provided insights into the role of the catalyst in the multi-step oxidative cascade reaction.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Mojtaba Amini, Younes Mousazade, Zahra Zand, Mojtaba Bagherzadeh, Mohammad Mahdi Najafpour
Summary: Ultra-small and highly dispersive iron oxide hydroxide has been characterized and shown to exhibit high efficiency and stability in chemical reactions, making it a promising catalyst with potential applications in various fields. The compound is effective for alcohol oxidation, organic sulfide oxidation, and alkene epoxidation reactions, and demonstrates good catalytic activity in water oxidation.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Environmental
Siyu Ding, Chen Zhu, Hajime Hojo, Hisahiro Einaga
Summary: The study investigated microwave-assisted heterogeneous catalytic oxidation of benzene using Cu-Mn spinel oxides, which showed superior activity and lower apparent activation energy under microwave heating, reducing the required reaction temperature. Transient tests revealed the high reactivity of Cu-Mn spinel oxides related to lattice oxygen on the catalyst surface, which was enhanced under microwave heating, leading to an accelerated benzene oxidation reaction. The combination of adsorption and catalytic oxidation processes efficiently decomposed benzene at low concentrations using Cu-Mn spinel oxides and zeolites.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Takafumi Ide, Kaibo Feng, Charlie F. Dixon, Dawei Teng, Joseph R. Clark, Wei Han, Chloe Wendell, Vanessa Koch, M. Christina White
Summary: A sustainable manganese perchlorophthalocyanine catalyst has been found to achieve selective intermolecular allylic C-H amination, including substrates with key sites and competing sites.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Inorganic & Nuclear
Xiuru Bi, Luyao Tao, Nan Yao, Mingxia Gou, Gexin Chen, Xu Meng, Peiqing Zhao
Summary: In this study, a H3PO4 center dot 12WO(3)/OMS-2 nanocomposite catalyst was successfully prepared, leading to the synthesis of β-carbolines and 3,4-dihydro-β-carbolines by tuning reaction conditions. The catalyst exhibited excellent activity, high selectivity, and good stability, providing a practical pathway for flexible and controllable synthesis of novel compounds.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Applied
A. Diaz-Verde, V Torregrosa-Rivero, M. J. Illan-Gomez
Summary: In this study, a series of CuX/Ba0.7MnO3 catalysts were synthesized, characterized and tested for CO oxidation reaction. It was found that Cu-free perovskite was the most active catalyst, while Cu-containing catalysts showed higher activity at higher CO concentrations. Cu4/Ba0.7MnO3 and Cu12/Ba0.7MnO3 catalysts exhibited more active sites and demonstrated high stability and recyclability during the reaction.
TOPICS IN CATALYSIS
(2023)
Article
Energy & Fuels
Yue Cao, Fuyu Wang, Qinlei Peng, Chuanmin Chen, Songtao Liu, Wenbo Jia, Runlong Hao
Summary: Copper modified attapulgite (Cu3-ATP) catalyst can synergistically oxidize NH3 and Hg0, despite competition between the two reactions. Hg0 oxidation is sulfur resistant in the presence of HCl, but NH3 oxidation is partially inhibited after adding SO2.
Article
Chemistry, Physical
Sara Movahedian, Aida Ramazi Farahani, Ali Reza Faraji
Summary: The design of a novel manganese-based dendritic catalyst for the selective oxidation of ethylbenzene and oximes has attracted renewed interest due to its mild reaction conditions, excellent catalytic performance, and magnetic recyclability. The study also investigated the effect of operating parameters and N-hydroxyimides on the catalytic efficiency of the synthesized dendritic catalyst.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Christopher D. Evans, Jonathan K. Bartley, Stuart H. Taylor, Graham J. Hutchings, Simon A. Kondrat
Summary: Exceptional selectivity of LaMnO3 supported Au catalysts for the oxidation of glycerol to tartronic acid is reported. The choice of metal nanoparticle influences the selectivity of the catalysts.
Article
Chemistry, Multidisciplinary
Weiwei Cao, Ana Isabel Becerro, Victor Castaing, Xue Fang, Pierre Florian, Franck Fayon, Didier Zanghi, Emmanuel Veron, Alessio Zandona, Cecile Genevois, Michael J. Pitcher, Mathieu Allix
Summary: Y3Al5O12 (YAG) is a widely used phosphor host with optical properties controlled by chemical substitution at YO8 or AlO6/AlO4 sublattices, resulting in different emission wavelengths. Nonstoichiometric compositions of Y3+xAl5-xO12 have been synthesized, allowing for new emission wavelengths and activator ions coordination environments. The nonstoichiometric YAG:Ce3+ system has a different response to up-conversion luminescence compared to stoichiometric counterparts, while the down-conversion emission is weakly affected. This study also demonstrates the synthesis of nonstoichiometric garnet materials, opening possibilities for property tuning and new applications.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Ming -Hui Sun, Ming -Yu Qi, Zi-Rong Tang, Yi-Jun Xu
Summary: In this study, a cobalt phosphate and reduced graphene oxide modified CdS photocatalyst was synthesized and employed for photocatalytic selective conversion of 4-methoxythiophenol to bis(4-methoxyphenyl) disulfide coupled with H2 evolution. The dual-cocatalyst system effectively captures and releases the holes from CdS through the chemical state change of Co, accelerating surface thiols oxidation, while graphene oxide serves as an electron collector and an active site for proton reduction. The bifunctional photocatalyst demonstrates significantly higher photoactivity and provides a new strategy for utilizing photoinduced electrons and holes for organic transformation and H2 evolution.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Review
Chemistry, Multidisciplinary
Nicholas F. Dummer, David J. Willock, Qian He, Mark J. Howard, Richard J. Lewis, Guodong Qi, Stuart H. Taylor, Jun Xu, Don Bethell, Christopher J. Kiely, Graham J. Hutchings
Summary: The direct transformation of methane to methanol at a larger scale remains challenging due to the low reactivity of methane. This review examines several promising routes to methanol and evaluates the performance targets necessary for process development. It provides critical perspectives on future operation and discusses the emergence of active heterogeneous catalysts and their reaction mechanisms.
Article
Chemistry, Physical
Parag M. M. Shah, Liam A. Bailey, Stuart H. Taylor
Summary: A series of ceria-manganese mixed metal oxide catalysts with different Ce:Mn ratios were prepared by coprecipitation, and their capabilities for total oxidation of propane and naphthalene were evaluated. The catalyst with a higher manganese content showed the highest activity, specifically Ce0.25Mn0.75Ox. Characterization techniques revealed that the high activity of Ce0.25Mn0.75Ox was attributed to the formation of phase-separated Mn-substituted ceria and Mn2O3 phases. The catalyst preparation technique also played a significant role, as the mechanochemical and urea catalysts exhibited greater activity than the carbonate coprecipitated catalyst.
Article
Chemistry, Multidisciplinary
Yin-Feng Wang, Ming-Yu Qi, Marco Conte, Zi-Rong Tang, Yi-Jun Xu
Summary: This study presents a new radical-induced method for the synthesis of benzimidazoles through high-performance photoredox coupling of alcohols and diamines on Pd/ZnO nanosheets. The unique advantages of ZnO nanosheets, especially the role of Pd nanoparticles in cleaving the alpha-C-H bond of alcohols and adsorbing subsequently-generated C-centered radicals, are revealed. Rational design of semiconductor-based photoredox systems provides new insights for efficient benzimidazole synthesis and hydrogen gas generation based on radical mechanisms.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Ceramics
Alessio Zandona, Victor Castaing, Alexander Shames, Gundula Helsch, Joachim Deubener, Ana Isabel Becerro, Mathieu Allix, Adrian Goldstein
Summary: An ultrabasic invert silicate glass was synthesized and used as host for transition metal dopants. Characterization techniques were employed to investigate the oxidation and coordination states of the dopants. Different dopants exhibited different oxidation states, with some displaying only their maximum oxidation state and others showing mixed valences. Reduction of oxygen content in the melting atmosphere led to the conversion of Cr6+ to Cr3+.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Ceramics
Haytem Bazzaoui, Cecile Genevois, Emmanuel Veron, Michael J. Pitcher, Mathieu Allix, Alessio Zandona
Summary: Quartz glass-ceramics with transition metal cations (Fe2+, Ni2+, Co2+) and no lithium, magnesium, or zinc exhibit tunable coefficients of thermal expansion. Co2+ has the lowest coefficient of thermal expansion, nearing zero. The unit cell volume is the key structural parameter leading to low or negative coefficients of thermal expansion.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Review
Chemistry, Physical
Yi Zhang, Ming-Yu Qi, Zi-Rong Tang, Yi-Jun Xu
Summary: Plastic waste pollution has become a pressing environmental crisis due to insufficient recycling schemes, especially with the impact of the COVID-19 pandemic. The review focuses on the potential of solar-powered upcycling of plastic waste into valuable chemicals. It outlines recent advances in photoredox-based catalytic plastic waste conversion and discusses the challenges and insights for further exploration in this domain.
Article
Chemistry, Physical
Chang-Long Tan, Ming-Yu Qi, Zi-Rong Tang, Yi-Jun Xu
Summary: Constructing highly active photocatalysts with rich reactive sites allows for the environmentally friendly utilization of CO2 with organic compounds. In this study, single-atom (SA) decorated two-dimensional (2D) single-layer ZnIn2S4 (ZIS) nanosheet composites with dual active centers of Co and Zn were used for CO2 fixation under visible light. The optimized Co-(s)ZIS composites exhibited significantly improved CO2-epoxide cycloaddition performance, attributing to the unique ensemble that optimizes light harvesting, promotes charge carrier separation, and enriches the bifunctional active sites. This work provides a paradigm for interfacial engineered SA-onto-2D semiconductors and highlights the structure-activity relationship by the well-defined active sites in this SA-based hybrid platform.
Article
Chemistry, Physical
Ming-Yu Qi, Zi-Rong Tang, Yi-Jun Xu
Summary: The sun provides a vast amount of clean and renewable energy, and the challenge lies in utilizing this decentralized energy with appropriate media. Plasmonic metal-based nanostructures, such as gold and silver, are fascinating materials for solar energy conversion due to their unique surface plasmon resonance (SPR) capability. Modulating the optical absorption peaks of nonplasmonic metals, like small platinum nanoparticles, without altering their size has been a grand challenge. Recently, a near field scattering (NFS) optical model was demonstrated to manipulate the absorption peaks of platinum nanoparticles by adjusting their dielectric environment, paving the way for tuning the optical absorption properties of other metal nanoparticles and semiconductor quantum dots.
Article
Chemistry, Physical
Parag M. M. Shah, Liam A. A. Bailey, David J. J. Morgan, Stuart H. H. Taylor
Summary: Iron-manganese mixed metal oxide catalysts with different Fe:Mn ratios were synthesized and evaluated for total propane oxidation. The Fe0.50Mn0.50Ox catalyst showed the highest activity due to increased surface area and the formation of a Mn2O3 phase. The choice of precipitating agent was found to affect the activity, with the hydroxide-precipitated catalysts generally being more active.
Article
Chemistry, Inorganic & Nuclear
Frantisek Simko, Aydar Rakhmatullin, Graham King, Mathieu Allix, Catherine Bessada, Zuzana Netriova, Dhiya Krishnan, Michal Korenko
Summary: In this study, a precise examination of a portion of the phase diagram of a CsF-Al2O3 system was conducted through various approaches. A new cesium oxo-fluoro-aluminate compound was discovered, and several pure compounds were synthesized to aid in the interpretation of NMR spectra.
INORGANIC CHEMISTRY
(2023)
Article
Materials Science, Ceramics
Julie Carreaud, Jean-Rene Duclere, Yann Launay, Nicolas Tessier-Doyen, David S. Smith, Mathieu Allix, Vincent Couderc, Gaelle Delaizir, Sebastien Chenu
Summary: For the first time, a fully dense Zn1.1Ga1.8Ge0.1O4 transparent spinel ceramic was achieved by spark plasma sintering. The ceramic exhibited a pure cubic spinel phase and a homogeneous microstructure with an average grain size of 200 +/- 100 nm. It demonstrated high transmittance in the visible range and near 2 μm, and excellent mechanical properties and thermal conductivity. Doping with Cr3+ and Ni2+ ions resulted in red luminescence with long-lasting afterglow and near-infrared broadband emission at 1.3 μm, respectively.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Claire Mevel, Julie Carreaud, Celine Caillaud, Francesco Bour, Gaelle Delaizir, Victor Castaing, Bruno Viana, Pierre Carles, Francois Brisset, Cecile Genevois, Mathieu Allix, Sebastien Chenu
Summary: This study reports on the elaboration of translucent ZnGa2O4 ceramics through an innovative process. The researchers used the lixiviation of glass-ceramics to obtain ZnGa2O4 nanocrystals, which were then sintered into bulk ceramics using Spark Plasma Sintering (SPS). Despite the slightly lower transmittance compared to the theoretical value, these results are promising and open up new possibilities for transparent ceramic processing.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
