Article
Biochemistry & Molecular Biology
Shiping Wei, Wenxiu Wang, Feirong Xiao
Summary: Manganese oxides are reactive minerals that are believed to be mainly formed through biotic processes. This study isolated and characterized a marine Mn-oxidizing fungus Neoroussoella solani MnF107. The fungus was found to form Mn oxides on its hyphal surfaces, with a filamentous morphology and enveloped by an EPS matrix. XRD analysis showed that the fungal Mn oxides were poorly crystalline, and chemical analysis confirmed they were predominantly composed of Mn(IV) resulting from the oxidation of Mn(II) by the fungus.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Martin Torres, Carolina de los Santos, Patrice Portugau, Maria Del Pilar Yeste, Jorge Castiglioni
Summary: Catalytic oxidation is an effective method to remove volatile organic compounds, and this study investigates the behavior of a group of catalysts extracted from Uruguay for the total combustion of toluene. The catalyst containing 40% Mn2O3 on the pillared clay showed the best catalytic performance, with 90% conversion of toluene at 300 degrees Celsius.
APPLIED CLAY SCIENCE
(2021)
Article
Electrochemistry
Daniel R. Jones, Haytham E. M. Hussein, Eleri A. Worsley, Sajad Kiani, Kittiwat Kamlungsua, Thomas M. Fone, Christopher O. Phillips, Davide Deganello
Summary: Manganese(III/IV) oxide, synthesized under different conditions, was investigated for its morphological, compositional, and electrochemical characteristics. The study found that low-temperature basic and acidic synthesis promoted the formation of turbostratic birnessite and cryptomelane phases, respectively. The choice of intercalating guest cations had a stronger effect on storage properties than crystallographic phase. The insights gained from this study provide a foundation for optimizing NaxKyMnOz for high-power storage applications.
Article
Chemistry, Multidisciplinary
Luis J. Garces, John Alexander Galeano, Hector F. Garces, Steven L. Suib, Beatriz Hincapie
Summary: Manganese oxides with different structures were synthesized and impregnated with sodium tungstate to enhance their catalytic performance in the selective epoxidation of cyclopentene. OL-1 exhibited the highest conversion and selectivity, while the structure and activity of OMS-1 were affected by tungstate impregnation. The presence of Mn2+ was found to be essential for the epoxidation reaction, and the reaction between tungstate ions and Mg2+ and/or Mn2+ during impregnation resulted in the formation of an inactive amorphous compound. Tungstate impregnation had no effect on the crystalline and chemical structure of OMS-2, which exhibited radical activity for the total oxidation of organic compounds in the presence of hydrogen peroxide.
Article
Engineering, Environmental
Mismel Ruiz-Garcia, Mario Villalobos, Andreas Voegelin, Teresa Pi-Puig, Nadia Martinez-Villegas, Joerg Goettlicher
Summary: In laboratory experiments, the uptake of Tl(I) by hexagonal birnessites was observed to trigger a complete phase conversion with Tl(I) as the sole reacting cation, resulting in lower residual dissolved Tl+ concentrations compared to single-step additions. This novel pathway may have implications for contaminated environments and the formation of minerals like thalliomelane.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Di Yu, Yu Ren, Xuehua Yu, Xiaoqiang Fan, Lanyi Wang, Ruidan Wang, Zhen Zhao, Kai Cheng, Yongsheng Chen, Zbigniew Sojka, Andrzej Kotarba, Yuechang Wei, Jian Liu
Summary: This study successfully prepared two types of soot oxidation catalysts, which exhibited excellent performance in the presence of water, especially the birnessite-type K2Mn4O8 catalysts showed good tolerance for sulfur and water. The study also discovered the important role of interlayer gallery species ions (K+, H2O) in the catalytic activity of birnessite materials in soot combustion, which has not been recognized before.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Fengyang Jing, Yanan Liu, Yaru Shang, Chade Lv, Liangliang Xu, Jian Pei, Jian Liu, Gang Chen, Chunshuang Yan
Summary: This study improves the Zn2+ transport and structural stability of aqueous zinc-ion batteries by introducing magnesium and potassium ions, achieving outstanding electrochemical performance with ultrahigh reversible capacity and excellent cycling stability.
ENERGY STORAGE MATERIALS
(2022)
Article
Microbiology
Laura Galezowski, Nadir Recham, Dominique Larcher, Jennyfer Miot, Feriel Skouri-Panet, Hania Ahouari, Francois Guyot
Summary: Mn(II)-oxidizing organisms can promote the formation of manganese oxides with specific textures, offering environmentally relevant routes to manganese oxide synthesis. In this study, a bacterium called Pseudomonas putida was used to produce manganese oxide in a biofilm. The biofilm was characterized using various techniques, and the results showed the formation of several minerals, including MnOx birnessite. Electrochemical measurements indicated the electroactivity of the biomineralized biofilm without any post-synthesis treatment, providing insights for designing new routes for electrode synthesis.
Article
Geochemistry & Geophysics
Margaret A. G. Hinkle, Jeffrey E. Post, Javier Peralta, Cara M. Santelli
Summary: Microbial manganese oxidation is important in the formation of Mn(III/IV) oxides in environmental systems. The presence of sulfonic acids can affect Mn biogeochemical cycling and microbial Mn oxidation processes. This study investigated the impact of sulfonic acids on fungal Mn oxidation and found that they can promote or suppress Mn oxidation depending on the fungus species. These findings highlight the sensitivity of Mn oxide structures and the Mn oxidation process to the aqueous environment.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Biochemistry & Molecular Biology
Magdalena M. Michel, Mostafa Azizi, Dorota Miroslaw-Swiatek, Lidia Reczek, Bogumil Cieniek, Eleonora Soco
Summary: A low concentration of manganese (Mn) in water is a critical issue for water supply systems. The study investigated the impact of different types of manganese oxides (MnOx) and pH on Mn adsorption level. The analysis showed that the type of MnO2 has a four times stronger influence than pH. There was no statistical significance for the ionic strength parameter.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Tuyet-Mai Tran-Thuy, Thi-Phuong Le, Trong-Phu Tran, Hoa-Hung Lam, Long Q Nguyen, Dung V Nguyen, Trung Dang-Bao
Summary: The surface parameters of cobalt-aluminum silicate ceramics were investigated using thermoluminescence and infrared spectroscopy techniques. The results showed that infrared spectroscopy is the most effective method for studying the surface of cobalt-aluminum silicate ceramics, while thermoluminescence can visually display the surface structure and chemical composition.
Article
Chemistry, Physical
Chenying Wang, Nicholas Smieszek, Vidhya Chakrapani
Summary: The research reveals that the properties of different interlayer cations and their coordinating water molecules strongly affect the band gap and electron affinity of birnessite, with the high electron affinity values enabling birnessite-type structures to spontaneously oxidize due to their band edges being well below the redox potential of most thermodynamically stable cations and water.
CHEMISTRY OF MATERIALS
(2021)
Article
Engineering, Environmental
Wen Qin, Peng Rao, Ken Fang, Lifan Liu, Xing Du, Yunlong Luo, Jiayu Tian
Summary: A vertical aeration-aided gravity driven ceramic membrane reactor was developed and used to purify groundwater contaminated with manganese. The results showed that a stable concentration of manganese in the effluent was achieved due to the formation of a matured birnessite functional layer on the ceramic membrane surface. The trade-off effect within the reactor was solved by reconstructing the birnessite-type film and increasing the water production flux. Vertical aeration also increased the abundance of manganese oxidizing bacteria.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Chemistry, Physical
Borui Li, Yanfang Chu, Bin Xie, Yuchen Sun, Lin Zhang, Hongmei Zhao, Lei Zhao, Peng-Fei Liu, Junjie He
Summary: Due to their potential applications in energy storage and water purification, researchers have paid significant attention to neutral aqueous supercapacitors (NASCs). Delta-MnO2, a well-known cathode material, has a 2D structure and high capacitance. However, its poor conductivity and dissolution affect its performance. In this study, indium is introduced to delta-MnO2 with the help of iron, leading to improved crystal water and conductivity. The optimized concentration of indium increases the gravimetric capacitance and cycling stability of delta-MnO2, making it a promising candidate for high-performance supercapacitors.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Applied
Baibing Wang, Nanqi Ouyang, Qin Zhang, Shizhang Zheng, Yang Li, Zhangjie Qin, Mimi Luo, Guanjie Jiang
Summary: Vernadite shows superior oxidation and adsorption abilities, with Ver-H synthesized by a new method displaying larger particle size and TOC degradation capacity compared to Ver-OH synthesized by a traditional method. Both vernadites exhibit strong adsorption capacities for Pb2+.
ADSORPTION SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Environmental
M. Arsalan Ashraf, Oihane Sanz, Cristina Italiano, Antonio Vita, Mario Montes, Stefania Specchia
CHEMICAL ENGINEERING JOURNAL
(2018)
Article
Chemistry, Physical
S. A. Regenhardt, C. I. Meyer, O. Sanz, V. Sebastian, S. Ivanova, M. A. Centeno, J. A. Odriozola, M. Montes, A. J. Marchi, T. F. Garetto
MOLECULAR CATALYSIS
(2020)
Article
Chemistry, Physical
Carol M. Olmos, Lidia E. Chinchilla, Alberto Villa, Juan J. Delgado, Ana B. Hungria, Ginesa Blanco, Laura Prati, Jose J. Calvino, Xiaowei Chen
JOURNAL OF CATALYSIS
(2019)
Article
Engineering, Environmental
Diogo F. M. Santos, Olivia S. G. P. Soares, Jose L. Figueiredo, Oihane Sanz, Mario Montes, Manuel Fernando R. Pereira
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Chemistry, Applied
Ignacio Cuauhtemoc-Lopez, Adriana Jimenez-Vazquez, Luis Alberto Estudillo-Wong, Gilberto Torres-Torres, Hermicenda Perez-Vidal, Miroslava Barrera-Salgado, Rosendo Lopez-Gonzalez, Durvel De la Cruz-Romero
Summary: Two magnetic catalysts, Fe2O3-TiO2 support and Rh/Fe2O3-TiO2 catalyst, were synthesized and characterized for naphthalene hydrogenation. The Rh/Fe2O3-TiO2 catalyst showed high selectivity and conversion rate in the reaction, maintained even after multiple cycles.
Article
Chemistry, Physical
Manuel Luna, Rafael Zarzuela, Maria J. Mosquera, M. L. Almoraima Gil, Laura M. Cubillana-Aguilera, Juan J. Delgado-Jaen, Jose M. Palacios-Santander, Valme Garcia-Moreno, Yolanda Carmona-Jimenez
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2019)
Article
Chemistry, Multidisciplinary
Daniel Goma, Juan Jose Delgado, Leon Lefferts, Jimmy Faria, Jose Juan Calvino, Miguel Angel Cauqui
Article
Chemistry, Multidisciplinary
Maria Ronda-Lloret, Vijaykumar S. Marakatti, Willem G. Sloof, Juan Jose Delgado, Antonio Sepulveda-Escribano, Enrique V. Ramos-Fernandez, Gadi Rothenberg, N. Raveendran Shiju
Article
Chemistry, Inorganic & Nuclear
Tiziano Montini, Valentina Gombac, Juan J. Delgado, Anna Maria Venezia, Gianpiero Adami, Paolo Fornasiero
Summary: The sustainable photocatalytic synthesis of benzimidazole derivatives was investigated through a one-pot, tandem process using ethanol as a starting material. Co-doping of TiO2 with B and N was found to enhance the photocatalytic activity in H-2 production, with Pt showing the highest selectivity in desired products and Pd demonstrating activity for hydrodehalogenation.
INORGANICA CHIMICA ACTA
(2021)
Article
Energy & Fuels
Pilar Tarifa, Cristina Megias-Sayago, Fernando Cazana, Miguel Gonzalez-Martin, Nieves Latorre, Eva Romeo, Juan Jose Delgado, Antonio Monzon
Summary: The study found that Ce is a better catalyst promoter than Mg, achieving higher CO2 conversion rates and CH4 selectivity over a wider temperature range. The Ni-Mg-Ce/CDC catalyst reached the highest methane yield of 80% in the temperature range of 350-400 degrees C. Ce-promoted catalysts also exhibited high activity at low temperatures.
Article
Chemistry, Physical
Isabel Gomez-Recio, Huiyan Pan, Alberto Azor-Lafarga, Maria Luisa Ruiz-Gonzalez, Maria Hernando, Marina Parras, Maria Teresa Fernandez-Diaz, Juan J. Delgado, Xiaowei Chen, Daniel Goma Jimenez, David Portehault, Clement Sanchez, Mariona Cabero, Arturo Martinez-Arias, Jose M. Gonzalez-Calbet, Jose J. Calvino
Summary: A family of iron-doped manganese-related hollandites, with the most active catalyst able to oxidize more than 50% of CO at room temperature, has been studied in detail. The presence of hydroxyl groups and Mn3+ content were found to play key roles in the catalytic activity of these materials, without the need for any critical noble metal in the catalyst formulation. Detailed structural analysis helped to identify the essential information about the oxidation state of manganese and the stabilizing effects of certain compounds in the hollandite oxide.
Article
Chemistry, Physical
Vijaykumar S. Marakatti, Maria Ronda-Lloret, Marian Krajci, Boby Joseph, Carlo Marini, Juan Jose Delgado, Francois Devred, N. Raveendran Shiju, Eric M. Gaigneaux
Summary: Intermetallic compounds (IMCs) are used as precursors to synthesize highly active and stable metal/metal oxide composite catalysts. Controlled modification leads to the formation of Co and Sm2O3 nano crystallites, enhancing catalytic activity. The presence of Co and Sm2O3 active sites in close proximity promotes the simultaneous adsorption or activation of reactants, improving catalytic performance.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Carolina Bohorquez, Hicham Bakkali, Juan J. Delgado, Eduardo Blanco, Manuel Herrera, Manuel Dominguez
Summary: This study reports the analysis of Zr-doped ZnO thin films using ellipsometry to determine their optical and electrical properties. Zr doping alters the conductivity of the films and shows minimal impact on their temperature stability. These Zr-doped ZnO films have the potential to be used in the development of thermally stable transparent conductive oxides (TCOs).
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Applied
Huiyan Pan, Xiaowei Chen, Oihane Sanz, Miguel A. Cauqui, Jose M. Rodriguez-Izquierdo, Juan J. Delgado
CHINESE JOURNAL OF CATALYSIS
(2019)
Article
Chemistry, Multidisciplinary
Zenaida Guerra-Que, Hermicenda Perez-Vidal, G. Torres-Torres, Juan Carlos Arevalo-Perez, Adib Abiu Silahua Pavon, Adrian Cervantes-Uribe, A. Espinosa de los Monteros, Ma. Antonia Lunagomez-Rocha
Article
Chemistry, Physical
Ming-Yi Chen, Ngoc Thanh Thuy Tran, Ahmed Abubakar Alao, Wen-Dung Hsu
Summary: This study demonstrates the significance of surface Pt atom arrangement for the efficiency of ORR in PEMFCs and reveals the correlation between Pt-Pt average distance and O2 dissociation barrier. Furthermore, the study discovers a robust correlation between the level of the catalyst's d-band center and O2 adsorption energy. High-entropy alloy substrates provide potential for controlling Pt arrangement and O2 dissociation barrier.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Eduardo C. Atayde Jr, Babasaheb M. Matsagar, Yu-Cheng Wang, Kevin C. -W. Wu
Summary: This study presents the first application of an acidic MOF, Sulfated MOF-808, in catalyzing the HAA reactions of furan oligomers for the production of biofuel precursors. The catalyst showed high yield, selectivity, and recyclability, making it versatile for different starting materials.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Maria do Carmo Rangel, Francieli Martins Mayer, Soraia Jesus de Oliveira, Sergio Gustavo Marchetti, Fabricio Luiz Faita, Doris Ruiz, Giovanni Saboia, Mariana Kieling Dagostini, Jonder Morais, Maria do Carmo Martins Alves
Summary: This study developed a new catalyst by investigating the effect of magnesium on the catalytic properties of hematite in ethylbenzene dehydrogenation. The catalyst showed important differences in activity, selectivity, and stability, making it a promising candidate for commercial applications.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yanjun Li, Qian Wang, Hui Tian, Mingyuan Zhu, Yuanyuan Liu
Summary: A novel strategy using microwave-assisted precipitation was proposed to prepare defective CsH3PMo11VO40 catalyst for the oxidation of methacrolein to methacrylic acid. Microwave treatment accelerates crystallization, increases vanadyl species content, and forms defective Keggin structures, thereby enhancing the oxidation capacity of the catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Rajeshwari Athavale, Sailee Gardi, Fatima Choudhary, Dayanand Patil, Nandkishor Chandan, Paresh More
Summary: In this study, a novel acidic ionic liquid catalyst was prepared and used for the synthesis of bis-indolyl methane derivatives. The catalyst exhibited short reaction times, easy purification, and reusability.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Masatomo Hattori, Takato Hattori, Masakuni Ozawa
Summary: Cu-added gamma-Al2O3 catalysts were prepared with varying Cu loadings and the effects of copper oxidation states on catalytic activity were investigated. The results showed that the addition of copper increased the catalyst activity, but excessive copper loading decreased catalytic activity. XRD and TEM analysis indicated the formation of a solid solution of copper oxide species on the surface of gamma-Al2O3. XAS and TPR data demonstrated variations in copper oxidation states among the catalysts.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liwei Fang, Shiyang Niu, Shengsen Wang, Yiqing Lu, Yuanhui Cheng
Summary: In this study, PtNi alloy on nitrogen-doped carbon and SnO2 dual-support was designed to modulate the metal-support interaction, resulting in improved catalytic activity and stability for oxygen reduction reaction. The SnO2/PtNi/NC catalyst exhibited a strongly coupled interface, enhanced electron transfer, and higher half-wave potential compared to PtNi/NC and commercial Pt/C.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Shohei Harada, Duanxing Li, Kenta Iyoki, Masaru Ogura
Summary: This study investigates the catalytic performance of a composite catalyst composed of ZnZrOX and H-zeolite for the hydrogenation of CO2. The deactivation of the composite catalyst is influenced by ion exchange of Zn2+ and/or coke, with their effects differing based on the zeolite structure. Separating the grains of the composite catalyst can prevent deactivation.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Laura Proano, Christopher W. Jones
Summary: In this study, NiGa alloy particles supported on CeO2, ZrO2, and ZrO2-CeO2 solid solutions were prepared and characterized. The nature of the support was found to have a significant influence on the catalyst's activity and selectivity, with the crystalline structure of ZrO2 having the greatest impact. Pure ZrO2 showed the highest methanol selectivity and CO2 conversion at high Zr:Ce ratios. In equimolar and Ce-rich conditions, basic sites and oxygen vacancies were found to be the key parameters affecting methanol production.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liyan Zhang, Yinze Yang, Leilei Zhou, Fengyu Zhao, Haiyang Cheng
Summary: 1,6-Hexamethylenediamine was successfully synthesized via the reductive amination of 1,6-hexanediol using a Ru/PRL(x)-Al2O3 catalyst. The highly dispersed and anchored Ru species, formed by 1,10-phenanthroline (PRL), played a crucial role in the catalytic reaction. The formation of new acid-base pairs, electron deficient Ru species, and smaller nanoparticles contributed to the improved catalytic performances of the Ru/PRL-Al2O3 catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Anita Horvath, Miklos Nemeth, Andrea Beck, Gyorgy Safran, Valeria La Parola, Leonarda Francesca Liotta, Gregor Zerjav, Matevz Roskaric, Albin Pintar
Summary: This study investigates the catalytic and structural changes caused by the addition of 0.25 wt% indium in a 3% Ni/CeO2-Al2O3 catalyst prepared by impregnation method. The results show that the addition of indium can decrease the activity of the catalyst, but it improves its stability and reduces coking.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Ankush Kularkar, Vaibhav Vilas Khedekar, Sachin D. Chaudhari, Mudavath Ravi, Sadhana S. Rayalu, Penumaka Nagababu
Summary: Efficiently addressing the challenges of photocatalytic CO2 reduction to CH3OH is crucial. This study developed Zn-BTC MOF and its composites with CaIn2S4, achieving highly efficient and robust photocatalytic CO2 reduction to CH3OH under ambient conditions, using H2O2 as the hydrogen source. Among the composites, ZMCIS4 demonstrated excellent performance with a CH3OH evolution of 49100 μmol/g.cat and a quantum efficiency of approximately 78.41%. The enhanced performance was attributed to the production of nascent hydrogen atoms (H center dot) through the photo-splitting of H2O2 on the ZMCIS surface.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Dan Liu, Yudong Li, Chengyu Wang, Haiyue Yang, Rong Wang, Shujun Li, Xiaohui Yang
Summary: In this study, a self-supporting three-dimensional porous Co3O4 nanobelt array decorated on nickel foam (P-Co3O4 -NBA@NF) electrode with numerous active sites was successfully constructed for the oxidation of 5-Hydroxymethylfurfural (HMF) to 2,5-furan dicarboxylic acid (FDCA). The P-Co3O4 -NBA@NF electrode demonstrated high conversion efficiency, selectivity, and Faraday efficiency, as well as remarkable long-term stability. This research provides a promising electrocatalyst for biomass conversion.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yimin Li, Enggah Kurniawan, Fumiya Sato, Takayoshi Hara, Yasuhiro Yamada, Satoshi Sato
Summary: In this study, several silica-alumina catalysts modified with Ag were examined for the dehydration of 1,3-butanediol to 1,3-butadiene. Among them, an amorphous silica-alumina catalyst (SAL-3) modified with Ag showed the highest improvement in catalytic activity and stability when operated in H2 flow. The generation of reversible acid sites was found to be the reason behind the enhanced activity and stability of this Ag/SAL-3 catalyst. The effects of various parameters on the catalytic activity of Ag/SAL-3, such as reaction temperature, contact time, Ag content, and carrier gas, were investigated.
APPLIED CATALYSIS A-GENERAL
(2024)
