Article
Chemistry, Applied
J. C. Martinez-Munuera, V. M. Serrano-Martinez, J. Gimenez-Manogil, M. P. Yeste, A. Garcia-Garcia
Summary: This research aimed to study the nature of active sites and synergies in copper/ceria-zirconia formulations for low temperature CO oxidation by creating copper entities with different properties. Results showed that increasing copper loading up to 2% led to gradual improvements in activity and reducibility. The preparation method was identified as a critical variable in catalytic performance, with the IWI method showing superior results.
Article
Materials Science, Ceramics
Shagufta Gulbadan, Muhammad Azhar Khan, Raqiqa Tur Rasool, Taharh Zelai, Khalid Mahmood, Muhammad Shahid, Altaf Hussain
Summary: The sol-gel auto-combustion process was used to synthesize M-type hexagonal ferrite powder samples with the chemical formula Ba0.3Sr0.7-xCoxFe12-ySmyO19 (x = 0-0.5, y = 0-0.05). The samples were analyzed using X-ray diffraction technique (XRD), Raman, and photoluminescence spectroscopies. The results showed that the samples possessed a hexagonal structure and had the impurity phase alpha-Fe2O3. The samples demonstrated semiconductor properties with a bandgap energy of 1.875 eV and were found to be suitable for microwave and high-frequency applications.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Mehdi Bejaoui, Abdelhakim Elmhamdi, Laura Pascual, Patricia Perez-Bailac, Kais Nahdi, Arturo Martinez-Arias
Summary: The catalytic performance of CoFe2O4 prepared by sol-gel for preferential CO oxidation in a H-2-rich stream was examined, as well as the promoting effects of incorporation of Ce, Co, Cu, and Zr by impregnation on the process. Surface modifications induced in CoFe2O4 upon introduction of the metals hinder a low temperature CO oxidation process but enhance activity above 125 degrees C, with copper-containing catalyst showing methanation activity due to favored reduced states of cobalt.
Article
Multidisciplinary Sciences
Vijendra Kumar Yadav, Hrushikesh Pramod Shinde, Taraknath Das
Summary: The copper-nickel oxide catalyst prepared by incipient wetness impregnation method showed higher conversion of cyclohexane compared to single-metal oxide catalyst, attributed to the synergistic effect of copper-nickel bimetallic oxides. The support also played a significant role in increasing the conversion of cyclohexane.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Applied
Parinya Tangpakonsab, Alexander Genest, Jingxia Yang, Ali Meral, Bingjie Zou, Nevzat Yigit, Sabine Schwarz, Guenther Rupprechter
Summary: CuO/CeO2 nanosphere catalysts were synthesized and tested for CO oxidation and preferential oxidation of CO (PROX) in excess H-2. The catalytic performance was independent of the initial oxidation state of the catalyst (CuO vs. Cu-0), suggesting the formation of the same active phase under reaction conditions. Density functional modeling was applied to understand the intermediate steps of CO oxidation and H-2 transformation.
TOPICS IN CATALYSIS
(2023)
Article
Materials Science, Multidisciplinary
Chao Liu, Tielong Shen, Cunfeng Yao, Hailong Chang, Kongfang Wei, Lijuan Niu, Zhiwei Ma, Zhiguang Wang
Summary: The study found that a Si modified steel SIMP exhibited better oxidation resistance compared to T91 in 500 degrees C steam with a flow rate of 5 m/s, and the oxidation rate was significantly enhanced at relatively low dissolved oxygen levels. This suggested that not only alloy composition and dissolved oxygen, but also the flow rate, played important roles in the corrosion behavior of ferritic-martensitic steels.
Article
Chemistry, Physical
Magali S. Ferrandon, Carly Byron, Gokhan Celik, Yuying Zhang, Chaoying Ni, Jennifer Sloppy, Rachel A. McCormick, Karl Booksh, Andrew Teplyakov, Massimiliano Delferro
Summary: In this study, a large number of different combinations of catalysts were synthesized using a high-throughput method. Evaluation revealed that the type of oxide support has a significant impact on the activity and stability of the catalysts, and the optimal effects of different metal promoters on various metal oxide supports varied.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Materials Science, Multidisciplinary
Ravi Kant, Ashish Kumar Singh, Arpit Arora
Summary: Ag-doped magnesium oxide nanoparticles were synthesized through chemical precipitation method, leading to smaller crystallite size and enhanced dielectric properties. Two possible mechanisms for the improvement of dielectric constant of Ag-doped MgO were summarized: inhibition of grain growth and generation of oxygen vacancies after Ag doping. Additionally, the ac conductivity of MgO NPs was improved after doping due to relatively low electron-transfer resistance.
Article
Multidisciplinary Sciences
Wasim Tahir, Muhammad Azhar Khan, Shagufta Gulbadan, Abdul Majeed, Khalid Mahmood
Summary: Cobalt and nickel substituted BaMg2Fe16O27 W-type hexaferrite nanoparticles were successfully synthesized using citric acid-assisted sol-gel auto-combustion technique, exhibiting a single-phase W-type hexagonal structure. The synthesized materials were found to possess semiconductor properties and show potential applications in microwave devices.
JOURNAL OF TAIBAH UNIVERSITY FOR SCIENCE
(2021)
Article
Chemistry, Physical
Xiao-Hu Ren, Dong-Yun Gui
Summary: The study found that the addition of different amounts of Yb(2)O(3)-MgO resulted in changes in the crystal structure of the ceramic material, forming a core-shell structure that significantly affected the dielectric properties of the material and led to a flat variation in the dielectric constant curve.
Article
Electrochemistry
G. Ramanathan, K. R. Murali
Summary: This study investigates the photocatalytic degradation behavior of different dyes catalyzed by tin oxide nanoparticles under UV-visible light radiation. It was found that tin oxide nanoparticles exhibit excellent photocatalytic activity, with Methylene Blue showing the highest degradation efficiency.
JOURNAL OF APPLIED ELECTROCHEMISTRY
(2022)
Article
Chemistry, Analytical
Vickram Singh, Christopher Bruneau, Zachary Karmiol, Jeremy Moon, Dev Chidambaram
Summary: Electroanalytical determination of chlorides in molten salts lacks the necessary accuracy for nuclear material monitoring, as observed in the studies on samarium trichloride. The formation of a poorly soluble and relatively stable oxychloride during the studies was identified as the cause of the accuracy loss. This study investigates the spectroscopic and electrochemical properties of synthesized samarium oxychloride in relation to the pyrochemical reprocessing of used nuclear fuel.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2023)
Article
Materials Science, Ceramics
G. K. Sukhadeve, S. Y. Janbandhu, Rahul Kumar, D. H. Lataye, D. D. Ramteke, R. S. Gedam
Summary: Fe doped TiO2 nanoparticles were successfully synthesized using a sol-gel method, and characterized by various analytical techniques. The doping concentration of Fe was found to affect the morphology and structure of the material. The synthesized nanoparticles exhibited excellent photocatalytic activity and removal efficiency.
CERAMICS INTERNATIONAL
(2022)
Article
Physics, Applied
Vinay S. Chauhan, Joshua Ferrigno, Saqeeb Adnan, Janne Pakarinen, Lingfeng He, David H. Hurley, Marat Khafizov
Summary: Validation of multiscale microstructure evolution models can be improved by coupling standard microstructure characterization tools with methods sensitive to individual point defects. In this study, optical absorption and Raman spectroscopies were used to characterize microstructure evolution in ceria under non-equilibrium conditions, in conjunction with transmission electron microscopy and x-ray diffraction. Experimental manifestation of non-equilibrium conditions was achieved by exposing cerium dioxide (CeO2) to energetic protons at elevated temperature. The results demonstrated the presence of extended and point defects in the microstructure, and a rate theory model was employed to infer the concentration of point defects. Raman spectroscopy measurements supported the abundance of cerium sublattice defects suggested by the model. This work lays the foundation for a coupled approach to guide and validate complex defect evolution models.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Optics
Madhuri Mishra, Rajib Saha, Lavi Tyagi, Sushama Sushama, Sushil Kumar Pandey, Subhananda Chakrabarti
Summary: In this study, phosphorus-doped MgZnO thin films were prepared through spin-on doping and annealing, which improved the morphology, structure, and optical properties. Annealing at temperatures of 800-900 degrees C resulted in good morphology and large grains.
JOURNAL OF LUMINESCENCE
(2023)
Article
Materials Science, Multidisciplinary
Md Irfan, A. Jeshurun, P. Baraneedharan, B. M. Reddy
Summary: This study successfully functionalized nitrogen-doped carbon quantum dots with hydroxyapatite and investigated the photoluminescence of the composites under ultraviolet radiation, resulting in nanoscale crystalline NCQDs/HAp composites with enhanced photoluminescence compared to pure HAp.
MATERIALS TECHNOLOGY
(2022)
Article
Chemistry, Physical
Mallesham Baithy, Deboshree Mukherjee, Agolu Rangaswamy, Benjaram M. Reddy
Summary: The WOx-promoted TiO2-ZrO2 solid acid catalyst showed superior catalytic performance in the acetalization and ketalization of glycerol with carbonyl compounds to produce biofuel additives. The presence of a higher concentration of Lewis acidic sites on the catalyst surface directly correlated with its activity, highlighting the key role of Lewis acidic sites in this catalytic process. The catalyst was also stable and performed well in the reactions with other substituted carbonyl compounds.
Review
Chemistry, Physical
Suranjana Patowary, Rashmi Chetry, Chiranjita Goswami, Bhugendra Chutia, Pankaj Bharali
Summary: This article primarily documents the recent advancements and challenges of supported nanomaterials with fascinating properties towards oxygen reduction reaction (ORR). The use of carbon-based materials as support and the significant factors affecting ORR activity are discussed, along with the electrochemical techniques and parameters used for data collection and evaluation.
Article
Chemistry, Multidisciplinary
Sitaramulu Palli, Yogendra Kamma, Nazeer Silligandla, Benjaram M. Reddy, Venkateshwar Rao Tumula
Summary: Mesoporous ceria-cobalt mixed oxides, ceria, and cobalt oxide catalysts were prepared using a modified template-assisted method and showed improved activity in the oxidation of ethylbenzene. The catalyst with a composition of Ce0.9Co0.1O2 exhibited the best performance, attributed to its facile redox behavior, increased surface adsorbed oxygen species, and larger surface area.
RESEARCH ON CHEMICAL INTERMEDIATES
(2022)
Article
Chemistry, Physical
Jyotirmoy Halder, Tarun Roy, Sayon Satpati, Subhas Ghosal, Deboshree Mukherjee, Benjaram M. Reddy
Summary: Solvent polarity has a significant impact on the catalytic activity and product distribution in heterogeneous catalysis. Experimental and simulation studies reveal that the conversion rate and product selectivity in the styrene oxidation reaction are affected by the polarity of the solvent.
CATALYSIS COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Bhugendra Chutia, Pankaj Bharali
Summary: We report the fabrication of a non-precious Fe2O3-CeO2/C electrocatalyst with a rich interfacial structure for the oxygen reduction reaction in alkaline electrolyte. The unique redox property of this catalyst gives it notable catalytic performance and stability, making it a promising candidate for oxygen reduction reaction.
CATALYSIS COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Manashi Sarmah, Debasish Sarmah, Anindita Dewan, Porag Bora, Purna K. Boruah, Manash R. Das, Pankaj Bharali, Utpal Bora
Summary: The Cu2O/Cu nanocatalyst was synthesized via a simple method using papaya peel extract, and it exhibited efficient catalytic activity in Pd-free Sonogashira and Chan-Lam cross-coupling reactions. Characterization techniques such as XRD and XPS confirmed the structure and formation of the catalyst.
Article
Energy & Fuels
Bhugendra Chutia, Suranjana Patowary, Ashok Misra, Komateedi N. Rao, Pankaj Bharali
Summary: We report a controllable synthesis of Co3O4 nanooctahedron anchored on Vulcan XC 72R (Oct-Co3O4/C) for the bifunctional electrocatalysis of oxygen reduction and oxygen evolution reaction (ORR/OER) in alkaline electrolyte. The Oct-Co3O4/C exhibits remarkable activity, stability, and durability, which can be attributed to the crystal symmetry effects, high specific surface area, and rich oxygen vacancies in the octahedral structure.
Article
Chemistry, Multidisciplinary
Sitaramulu Palli, Yogendra Kamma, Silligandla Nazeer, Benjaram M. Reddy, Tumula Venkateshwar Rao
Summary: In this study, a series of cerium-iron mixed oxides catalysts were prepared using a facile coprecipitation method and evaluated for the oxidation of vanillyl alcohol. The results showed that the incorporation of iron in the cerium oxide led to the formation of solid solutions, increased surface area and oxygen vacancies, and decreased reduction temperature. Among the catalysts investigated, Ce0.8Fe0.2O2 exhibited the best activity and selectivity.
RESEARCH ON CHEMICAL INTERMEDIATES
(2022)
Article
Electrochemistry
Kumar K. Hazarika, Bhugendra Chutia, Rabu R. Changmai, Purna K. Boruah, Manash R. Das, Pankaj Bharali
Summary: In this study, nanohybrids of various Fe-Co oxides anchored on to carbon matrix were systematically investigated for high-performing oxygen electrode reactions. Among them, Fe2.1Co0.9O4/C NH exhibited superior oxygen reduction reaction (ORR) performance compared to other compositions and benchmark Pt/C. Additionally, the Co3+ rich Fe0.9Co2.1O4/C NH demonstrated excellent oxygen evolution reaction (OER) performance. These electrocatalysts with bimetallic active sites and carbon matrix showed unique electrocatalytic properties, making them significant candidates for oxygen electrocatalysis.
Article
Chemistry, Inorganic & Nuclear
Chinmoy Kalita, Purna K. Boruah, Manash R. Das, Pranjal Saikia
Summary: A facile green synthesis method for magnetically separable nickel-ferrite nanocomposites supported over reduced graphene oxide (NiFe2O4/rGO) using peppermint leaf extract as a reducing agent is reported. The as-synthesized nanocomposites exhibit magnetic properties and can serve as efficient photocatalysts. The nanocomposites have been well characterized, and their morphology and structure indicate the formation of spherical NiFe2O4 nanocomposites supported over rGO layers. These nanocomposites show active participation in the photocatalytic degradation of various dyes under direct sunlight, with complete degradation achieved in a short time. The recovery and reusability of the nanocomposites are also demonstrated, indicating the effectiveness of the catalysts.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Deshetti Jampaiah, Devaiah Damma, Perla Venkataswamy, Anastasios Chalkidis, Hamidreza Arandiyan, Benjaram M. Reddy
Summary: The water-gas shift (WGS) reaction is crucial for producing hydrogen and renewable energy in modern technologies. Catalysts, such as Cu/CeO2, play a vital role in achieving high CO conversion and hydrogen generation activity in the WGS reaction. This study investigates the influence of CuCe-MOF templated approach on the WGS activity of Cu/CeO2 catalysts.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Ekaterina Matus, Olga Sukhova, Mikhail Kerzhentsev, Ilyas Ismagilov, Svetlana Yashnik, Vladimir Ushakov, Olga Stonkus, Evgeny Gerasimov, Andrey Nikitin, Pankaj Bharali, Zinfer Ismagilov
Summary: This study investigates hydrogen production through the bi-reforming of methane over exsolution-derived Ni catalysts. The performance and resistance to coking of the nickel-based catalysts are influenced by adjustments to the composition of the oxide matrix, which control their textural, structural, morphological, and redox properties. The preferred M-type and M/Ce ratio are crucial in determining the best performance of the catalysts.
Article
Energy & Fuels
Rashmi Chetry, Bhugendra Chutia, Suranjana Patowary, Biraj Jyoti Borah, Putla Sudarsanam, Pankaj Bharali
Summary: In this study, a homogeneously embedded Pd2CuCo alloy in the carbon matrix was synthesized. The as-synthesized Pd alloy electrocatalyst exhibited an improved limiting current density, a smaller Tafel slope, and a comparable onset potential compared to Pt/C. Moreover, the Pd2CuCo alloy electrocatalyst also demonstrated excellent methanol tolerance, higher activity, and long-term stability toward the formic acid oxidation reaction compared to Pd/C.
Article
Chemistry, Physical
Chiranjita Goswami, Biraj Jyoti Borah, Ruprekha Das, Kohei Tada, Shingo Tanaka, Igor P. Prosvirin, Ilyas Z. Ismagilov, Ekaterina Matus, Mikhail Kerzhentsev, Pankaj Bharali
Summary: Engineering metal/oxide interface and controlling composition are important strategies for efficient Pd-based electrocatalysts. In this study, Pd3M alloy nano-particles anchored on C-CeO2 (Pd3M/C-CeO2, M = Cu, Ni, Co) demonstrated significant performance in formic acid oxidation. The improved activity can be attributed to the electronic and synergistic effects between Pd and the alloyed metal, resulting in lattice contraction and downshift of d-band center. The presence of oxygen vacancies in CeO2 and strong Pd/CeO2 interactions also contribute to the overall electrocatalytic behavior.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
