Article
Chemistry, Physical
Sylwia Gorecka, Katerina Pacultova, Dagmar Fridrichova, Kamil Gorecki, Tereza Bilkova, Radim Zebrak, Lucie Obalova
Summary: Copper-containing mixed metal oxides show high catalytic efficiency and selectivity in the selective catalytic oxidation of ammonia, with the Cu and Ce loading affecting catalytic activity and N-2 selectivity. Physicochemical characterization of the catalysts helps understand the correlation between catalyst efficiency and the form and distribution of CuO on the samples' surface.
Article
Chemistry, Physical
Sylwia Gorecka, Katerina Pacultova, Aneta Smykalova, Dagmar Fridrichova, Kamil Gorecki, Anna Rokicinska, Piotr Kustrowski, Radim Zebrak, Lucie Obalova
Summary: The study showed a high correlation between the amount of copper and the efficiency of the catalysts for selective catalytic oxidation of ammonia. Copper species in the form of highly dispersed CuO oxides were found to be responsible for high N-2 selectivity, while the addition of cerium had an effect on the material's catalytic activity and N-2 selectivity. The developed materials exhibited high catalytic activity in a wide range of concentrations of ammonia and oxygen.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Applied
Luanda Alves do Nascimento, Lsabel Barroso-Martin, Sara Raysa Silva Pecanha, Santiago Arias, Beate Saegesser Santos, Jose Geraldo A. Pacheco, Antonia Infantes-Molina, Enrique Rodriguez-Castellon, Ivoneide de Carvalho Lopes Barros
Summary: This study investigated the effect of different Ce3+ and Ce4+ concentrations in layered double hydroxides (LDHs) to obtain low-cost and high-performance mixed oxide catalysts for the deoxygenation process of high-oxygenated compounds in bio-oil. The presence of Ce4+ ions was found to play a crucial role in the activity of the catalysts. This research provides technical support for the utilization of bio-oil.
Article
Chemistry, Multidisciplinary
Ze He, Jiawei Guo, Fangyu Xiong, Shuangshuang Tan, Yixu Yang, Ruyue Cao, Greta Thompson, Qinyou An, Michael De Volder, Liqiang Mai
Summary: This article introduces improvements made to the Daniell cell to make it rechargeable, including the use of ion exchange membranes as alternatives to salt bridges. These improvements result in increased energy density of the Daniell cell and allow for easy recycling and scalability to higher capacity cells.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Applied
Ashley Love, Darren S. Lee, Gabriele Gennari, Richard Jefferson-Loveday, Stephen J. Pickering, Martyn Poliakoff, Michael George
Summary: This study reports the development of a small footprint continuous electrochemical Taylor vortex reactor capable of processing kilogram quantities of material per day. By controlling the size of the annular gap and the rotation speed of the electrode, optimization of substrate conversion and product selectivity can be achieved.
ORGANIC PROCESS RESEARCH & DEVELOPMENT
(2021)
Article
Chemistry, Physical
K. S. Kurmangaleev, M. I. Ikim, M. A. Kozhushner, L. I. Trakhtenberg
Summary: The electronic structure of nanoparticles in binary mixtures of oxides was studied using the example of CeO2-In2O3. The study focused on the effect of catalytically active CeO2 nanoclusters on charge distribution in nanoparticles with a high concentration of conduction electrons (In2O3). It was found that the spillover of oxygen atoms from CeO2 nanoclusters to In2O3 nanoparticles resulted in an enhancement of the inhomogeneous distribution of conduction electrons, leading to a depletion of the near-surface layer. The film resistance increased with an increase in CeO2 concentration, attributed to a decrease in near-surface electron density in In2O3 nanoparticles and overlap of current flow paths by CeO2 nanoclusters.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
A. Sekkat, M. Weber, J. Lopez-Sanchez, H. Rabat, D. Hong, J. Rubio-Zuazo, D. Bellet, G. Chichignoud, A. Kaminski-Cachopo, D. Munoz-Rojas
Summary: In this study, innovative atmospheric-pressure spatial atomic layer deposition processes were used to control the oxidation state of copper. The selective deposition of Cu, Cu2O, and CuO thin films at low temperatures was achieved by using different coreactants. The obtained materials were pure and crystalline, and the deposition mechanism was based on disproportionation, hydrolysis, and oxidation reactions. This method allows for controlling the oxidation state of copper-based thin films in an open-air environment, reducing cross-contamination.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Chemistry, Physical
Meihuan Lei, Bilv Hong, Lu Yan, Rongzhou Chen, Fei Huang, Ying Zheng
Summary: Preferential oxidation of CO (CO-PROX) is an effective method for reducing CO in H2-rich streams. This study prepared a series of CuxCe1-xO2 (x = 0, 0.05, 0.09, 0.17) supported Ir catalysts, and found that 1 wt% Ir/Cu0.09Ce0.91O2 exhibited excellent performance in terms of CO conversion, stability, and resistance to CO2 and H2O.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Nanoscience & Nanotechnology
Qingling Liu, Xueqian Wu, Rui Han, Caihong Pang, Shuang Xing, Lizhe Yang, Chunfeng Song, Na Ji, Xuebin Lu, Degang Ma
Summary: The Cu-doped CeO2 nanostructure catalyst supported on a boron-rich carbon carrier synthesized using a simple impregnation method showed enhanced catalytic activity, long-term stability, and resistance to water vapor in the oxidation of acetone. The introduction of Cu was found to limit the growth of CeO2 grains, increase the amounts of Ce3+ and adsorb oxygen species, and enhance the redox properties of CeO2, making it a promising catalyst for the removal of acetone.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Shawn C. Rood, Oriol Pastor-Algaba, Albert Tosca-Princep, Bruno Pinho, Mark Isaacs, Laura Torrente-Murciano, Salvador Eslava
Summary: The study involves the incorporation of Cu and Cr metals as dopants in ceria nanorods prepared by a single-step hydrothermal synthesis. The simultaneous Cu and Cr co-doping results in a catalyst with a higher surface Cu concentration and enhanced surface reducibility. Co-doping with both Cu and Cr enhances the benefits of both dopants in a synergistic manner, utilizing roughly a quarter of dopant weight.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Physical
Faiza Sahraoui, Naima Haddad, Jean-Francois Lamonier, Cherifa Rabia
Summary: This study investigates the structural and catalytic properties of Ce-containing MgAl layered double hydroxides (LDH). The effects of cerium content and calcination temperature on the properties of Ce-containing MgAl LDH were explored. The results showed that the samples with higher cerium content exhibited better catalytic activity, with complete butanol conversion achieved at lower temperatures. The presence of cerium in the LDH structure contributed to its reducibility and enhanced O-2(-) diffusion, facilitating the transformation of butanol.
Article
Chemistry, Applied
Deliang Meng, Meng Wang, Zongyu Feng, Chao Xia, Yanyan Zhao, Xiaowei Huang
Summary: This study aims to analyze the phase change behavior of Baotou mixed rare earth concentrate during oxidative roasting at 450-800 degrees Celsius. The results show that with the increase of roasting temperature, the decomposition of bastnaesite in the concentrate becomes more complete, leading to a decrease in the leaching rate of La during the subsequent HCl leaching process.
JOURNAL OF RARE EARTHS
(2022)
Article
Chemistry, Physical
Yun-Jae Lee, Trinh Thi Ly, Taehun Lee, Krisztian Palotas, Se Young Jeong, Jungdae Kim, Aloysius Soon
Summary: Accurate atomistic models for metal/oxide interfaces are crucial for understanding copper-based interfacial processes, and in this study, the atomic structures of the 29 and 44 surfaces on Cu(111) are successfully revealed through ab initio STM simulations and experiments. A complete atomistic model for the larger 44 surface is elucidated, providing further insights into early oxidation on copper.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Budhadeb Chowdhury, Sk Mehebub Rahaman, Aniruddha Ghosh, Kalachand Mahali, Pintu Sar, Bidyut Saha
Summary: This study investigates the employment of two surfactants in the oxidation of 1-propanol and 1,3-propanediol by copper(III)-periodate (DPC) complex in aqueous micellar media. The results show a significant enhancement in the catalytic efficiency of the oxidation reactions when both surfactants are present in equimolar amounts. Additionally, the aggregation of the binary surfactants plays a crucial role in the analysis of the absolute kinetic results of the oxidation study.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Review
Chemistry, Physical
Marius Stoian, Vincent Roge, Liliana Lazar, Thomas Maurer, Jacques C. Vedrine, Ioan-Cezar Marcu, Ioana Fechete
Summary: Methane is a significant energy source but also a major greenhouse gas. Catalytic combustion of methane can effectively reduce pollutants and minimize harm to human health and the environment.
Article
Chemistry, Applied
Sabrina Ballauri, Enrico Sartoretti, Chiara Novara, Fabrizio Giorgis, Marco Piumetti, Debora Fino, Nunzio Russo, Samir Bensaid
Summary: Catalytic oxidation is an effective technology for controlling methane emissions. Palladium-based catalysts supported on cerium-praseodymium mixed oxides exhibit improved activity and stability.
Article
Chemistry, Applied
Enrico Sartoretti, Chiara Novara, Angelica Chiodoni, Fabrizio Giorgis, Marco Piumetti, Samir Bensaid, Nunzio Russo, Debora Fino
Summary: In this study, novel ceria-based nanocatalysts containing different quantities of La and Nd were prepared and their structural and physico-chemical properties were examined. Doping with La and Nd altered the morphology and oxygen deficiency of ceria and affected the catalytic activity towards CO, NO, and soot oxidation. Among them, the Ce-La equimolar oxide exhibited outstanding performances due to its optimal morphology and surface acidity.
Article
Environmental Sciences
Giuseppe Pietricola, Melodj Dosa, Carminna Ottone, Debora Fino, Marco Piumetti, Tonia Tommasi
Summary: This study successfully immobilized the ADH and AldDH enzymes on mesoporous siliceous supports, significantly increasing their thermal stability and allowing for reuse in multiple reaction cycles.
WASTE AND BIOMASS VALORIZATION
(2022)
Article
Chemistry, Physical
Sabrina Ballauri, Enrico Sartoretti, Min Hu, Carmine D'Agostino, Zijuan Ge, Liang Wu, Chiara Novara, Fabrizio Giorgis, Marco Piumetti, Debora Fino, Nunzio Russo, Samir Bensaid
Summary: This study presents an improved design for Pd/Ce-Pr catalysts, showing that the PdO-PrOx interaction in materials with high praseodymium content results in lower activity, while a limited amount of Pr in ceria can lead to a more active catalyst. The simultaneous presence of Pd in its reduced and oxidized forms is a key factor for high activity, and the higher hydrophobicity of the sample significantly reduces the H2O inhibition effect typical of Pd-based materials.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Melodj Dosa, Nadia Grifasi, Camilla Galletti, Debora Fino, Marco Piumetti
Summary: In this study, the adsorption performance of Clinoptilolite and other adsorbents on Methylene Blue was investigated. It was found that Clinoptilolite exhibited good adsorption capacity at low concentrations, and the pseudo-second-order kinetic model effectively described the adsorption process.
Article
Food Science & Technology
Silvia Grassi, Alessandro Giraudo, Chiara Novara, Nicola Cavallini, Francesco Geobaldo, Ernestina Casiraghi, Francesco Savorani
Summary: A method combining FT-NIR spectroscopy and chemometric modelling was investigated to obtain real-time knowledge about the roasting effects on coffee's chemical-physical composition. In-line spectra were acquired by inserting a NIR probe into a laboratory coffee roaster, and MCR-ALS was used to model the chemical-physical changes during the roasting process. The proposed approach provides the groundwork for direct real-time implementation of automated monitoring of the roasting process at industrial scale.
FOOD ANALYTICAL METHODS
(2023)
Article
Chemistry, Physical
Chiara Novara, Daniel Montesi, Sofia Bertone, Niccolo Paccotti, Francesco Geobaldo, Marwan Channab, Angelo Angelini, Paola Rivolo, Fabrizio Giorgis, Alessandro Chiado
Summary: This study investigates the impact of probe labelling configuration on the sensitivity of SERS-based bioassays for miRNA quantitation. The results show that at high concentration of miRNA, locating the Raman reporters closer to the plasmonic surface significantly increases the SERS intensity. However, at low miRNA concentration, the SERS intensity levels off.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Applied
Clarissa Cocuzza, Enrico Sartoretti, Chiara Novara, Fabrizio Giorgis, Samir Bensaid, Nunzio Russo, Debora Fino, Marco Piumetti
Summary: A set of Cu-Mn oxides was synthesized using solution combustion synthesis method with varying copper and manganese ratios. The physico-chemical properties of the samples were investigated with various techniques, and the catalysts were tested for total VOC oxidation. The best performance was achieved with a copper content ranging from 15 at % to 45 at%, and the catalysts exhibited good stability and low water vapor inhibition.
Article
Chemistry, Applied
Enrico Sartoretti, Chiara Novara, Maria Cristina Paganini, Mario Chiesa, Micaela Castellino, Fabrizio Giorgis, Marco Piumetti, Samir Bensaid, Debora Fino, Nunzio Russo
Summary: Copper-ceria mixed oxides are considered promising catalysts for oxidation reactions, but their mechanistic understanding is still incomplete. In this study, pure and Cu-doped ceria samples were investigated through spectroscopic techniques, revealing the role of different copper sites and lattice defects. Cu+ species and Cu0 clusters promote CO adsorption at low temperature, while isolated Cu2+ monomers and dimers enhance lattice oxygen mobility. Changes in the structure of Cu-doped ceria occur during CO oxidation, but can be reversed and reorganized in the presence of O2. The excellent performance of Cu-doped ceria originates from the cooperation among different catalytic sites in the mixed oxide.
Article
Materials Science, Biomaterials
Clarissa Cocuzza, Elena Antoniono, Carminna Ottone, Valentina Cauda, Debora Fino, Marco Piumetti
Summary: This study aims to obtain a stable and active biocatalyst for drug screening purposes. By immobilizing hLDH-A enzyme on functionalized mesoporous silica, the researchers successfully achieved a stable biosensor for anticancer drugs. The immobilized enzyme showed high yields and retained activity, as well as good stability under certain conditions.
ACS BIOMATERIALS SCIENCE & ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Clarissa Cocuzza, Giuseppe Pietricola, Ilaria Zonca, Melodj Dosa, Oscar Romero, Tonia Tommasi, Valentina Cauda, Debora Fino, Carminna Ottone, Marco Piumetti
Summary: In this study, a co-immobilization method of formate dehydrogenase (FDH) and glycerol dehydrogenase (GlyDH) enzymes was proposed to reduce CO2 into formic acid. Natural zeolite was used as the immobilization support, and its mesostructures were obtained through modification. The results showed a significant increase in the activity of FDH when using the mesostructured zeolite as the support. This research has potential implications in the fields of enzyme immobilization and biocatalysis.
