Article
Nanoscience & Nanotechnology
Maria Pilar Yeste, Juan Carlos Hernandez-Garrido, Michael Uwe Kumke, Sarah Alvarado, Miguel Angel Cauqui, Jose Juan Calvino, Philipp-Alexander Primus
Summary: The use of a catalyst support for the design of nanoscale heterogeneous catalysts based on cerium oxide offers vast possibilities for future catalyst development. In this study, zirconia-supported ceria catalysts were synthesized and characterized. Experimental results show that the formation of reversible reactive pyrochlore structures can be achieved through low-temperature reduction-oxidation pretreatment, without altering the morphology of the catalyst.
ACS APPLIED NANO MATERIALS
(2022)
Article
Engineering, Chemical
Miki Inada, Junichi Hojo
Summary: In this study, CeO2-ZrO2 solid solution particles were prepared by a spray pyrolysis method, and the addition of organic additives was effective in increasing the specific surface area and forming a uniform solid solution structure, thereby enhancing the oxygen storage capacity.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Chemistry, Inorganic & Nuclear
Feng Zhao, Shuangde Li, Yunfa Chen
Summary: The Ce-Zr oxide solid solution with different Zr dopants can significantly enhance oxygen storage capacity and thermal stability. Ethanol addition to the carboxylic acid solvent further increases oxygen vacancy concentration and improves oxygen storage capacity. Introducing ethanol can suppress Zr migration from the lattice to the surface of CeO2 at 1000 degrees C, enhancing oxygen storage capacity and thermal stability.
JOURNAL OF SOLID STATE CHEMISTRY
(2021)
Article
Engineering, Environmental
Yuanqing Ding, Yanyan Jia, Mingxiang Jiang, Yanglong Guo, Yun Guo, Li Wang, Qingping Ke, Minh Ngoc Ha, Sheng Dai, Wangcheng Zhan
Summary: The structure of CeO2-ZrO2 mixed oxides support significantly affects the catalytic activity of Pd/CZ catalysts in methane combustion, with CZ oxides featuring a two-phase composite structure exhibiting higher oxygen storage capacity and mobility, positively impacting the performance of Pd/CZ catalysts.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
J. M. Serra, M. Balaguer, J. Santos-Blasco, J. F. Borras-Morell, B. Garcia-Banos, P. Plaza-Gonzalez, D. Catalan-Martinez, F. Penaranda-Foix, A. Dominguez, L. Navarrete, J. M. Catala-Civera
Summary: This study investigates microwave-induced redox transformations on solid-state ion-conducting materials, and finds that reduction is triggered at a specific temperature leading to a significant increase in electric conductivity. The effectiveness of the redox process is influenced by material composition, gas environment, and microwave power intensity, with fine-grained materials showing amplified effects.
MATERIALS HORIZONS
(2023)
Review
Chemistry, Physical
Roman Dziembaj, Marcin Molenda, Lucjan Chmielarz
Summary: Non-stoichiometric CeO2-y, especially in the form of nanocrystal aggregates, has exceptional catalytic activity in redox reactions. It improves the activity of transition metals and their oxides dispersed on it, and serves as an oxygen buffer. The synthesis methods and deposition techniques for these nanomaterials and their applications in redox reactions are comprehensively reviewed in this article, with over 160 references provided for further details.
Article
Chemistry, Applied
Athira S. Vijayan, Antony Joseph, Abey Joseph, T. S. Abhijith, Baiju G. Nair, V. Sajith
Summary: Novel polydopamine functionalized ceria-zirconia nanoparticles filled water-borne epoxy nanocomposite coatings were developed to prevent microbial-induced corrosion of mild steel. The coatings exhibited exceptional anti-biofouling and anti-biocorrosion properties due to the synergistic effect of PDA functionalization and zirconium incorporation, providing significant enhancement in charge transfer resistance and coating resistance.
PROGRESS IN ORGANIC COATINGS
(2024)
Article
Chemistry, Multidisciplinary
Ayano Taniguchi, Yoshitaka Kumabe, Kai Kan, Masataka Ohtani, Kazuya Kobiro
Summary: Porous ceria was successfully synthesized through a unique solvothermal reaction, resulting in homogeneous and monodisperse spheres with a large surface area. The catalytic performance of the porous ceria exhibited superior and distinct reaction activity compared to commercial CeO2, attributed to the high concentration of Ce3+ and significant oxygen adsorption capacity.
Review
Energy & Fuels
Igor Zagaynov
Summary: The transformation of methane into more valuable products has gained considerable attention, particularly with the importance of synthesis gas in the chemical industry. A major limitation in this process is the rapid deactivation of catalysts, often due to sintering of active sites and carbon formations. This emphasizes the need for designing catalysts with excellent active sites to improve overall performance.
Article
Chemistry, Physical
Fang Li, Ling Zou, Jian He, Yonghui Wu, Lu Yang, Qingshan Liu, Qianqian Wu, Xiaochao Yang
Summary: A synthesis platform for mesoporous ceria nanoparticles (MCNs) with strong structure tuning capacity was established to explore the relationship between their structure and catalytic activity. Various MCNs were synthesized by altering ligand/precursor ratio, addition manner and reaction temperature, and their structural parameters and catalytic activities were evaluated. Different structure parameters played different roles in controlling catalytic reactions, with pore size and crystallite size affecting oxygen storage capacity (OSC), pore size regulating enzyme mimetic activity, and surface area dominating photocatalytic activity.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Eric Prates da Costa, Alexander Hofmann, Ulrich Goebel, Pascal Cop, Bernd M. Smarsly
Summary: In this study, we investigated the development of micro- and mesoporosity of a Ce(x)Zr(1-x-y-z)Y(y)LazO(2-delta) oxygen storage material at high temperatures. We found that the stability of the mesopore system is related to the presence of surface-bound nitrate groups introduced during synthesis.
Article
Chemistry, Applied
Zhiyu Zhou, Michael P. Harold, Dan Luss
Summary: Simultaneous conversion of NO, CO and C3H6 was carried out on washcoated monoliths containing oxygen storage material-promoted mixed Platinum group metals to evaluate the promotion effects and identify the best architecture. PGM supported directly on the OSM was found to be the best design for one type of OSM, while a dual-layer architecture outperformed the MFO-supported PGM catalyst. Enhancement in conversion efficiency was achieved with the dual-layer PGM-MFO catalyst due to a direct catalytic contribution from the spinel. The study provides insights into the benefits of OSM and guidance for optimizing multi-component PGM + OSM catalyst composition and architecture.
Article
Chemistry, Analytical
Xinyu Li, Pengcheng Xu, Yufan Zhou, Ying Chen, Hao Jia, Haitao Yu, Xinxin Li
Summary: The microcantilever-based in situ H2-TPR technology accurately measures the mass change caused by reduction of catalysts, and it has the advantages of simplified operation and high precision.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Andre L. A. Marinho, Raimundo C. Rabelo-Neto, Florence Epron, Nicolas Bion, Fabio B. Noronha, Fabio Souza Toniolo
Summary: The Pt@CeO2 and Pt@CeZrO2 catalysts were found to have a significant impact on the carbon removal mechanism in dry reforming of methane, due to their higher presence of reactive oxygen species, making them more resistant to coke formation.
JOURNAL OF CO2 UTILIZATION
(2021)
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, Ceramics
Kenneth Kane, Eugenio Garcia, Padraig Stack, Michael Lance, Cory Parker, Sanjay Sampath, Bruce A. Pint
Summary: The study shows that EBCs have a certain effect on reducing the rate of SiO2 formation, especially when paired with a Si bond coating. The adhesion of the coating and roughness of the substrate play a crucial role in the effectiveness of EBCs.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Emmanouil Symianakis, Stavros Karakalos
Summary: This study investigates the catalytic hydrogenation process on Ni(110) surface using Density Functional Theory (DFT) calculations. The results suggest that the formation of Ni 1x2 phase on Ni(110) leads to the creation of stable subsurface adsorption sites for hydrogen atoms, and the reversal of the thermodynamic drive allows the subsurface hydrogen atoms to desorb above room temperature.
CHEMICAL PHYSICS LETTERS
(2022)
Article
Materials Science, Ceramics
Kenneth Kane, Eugenio Garcia, Michael Lance, Cory Parker, Sanjay Sampath, Bruce Pint
Summary: Environmental barrier coatings (EBCs) are crucial for protecting SiC-based ceramic matrix composite components in next-generation high-efficiency industrial gas turbines (IGTs). However, limited data on EBC failure mechanisms exist, particularly at high temperatures. Experimental results showed that at elevated temperatures, EBCs formed thick, highly cracked, and fully crystalline cristobalite scales.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Corey R. Martin, Kyoung Chul Park, Gabrielle A. Leith, Jierui Yu, Abhijai Mathur, Gina R. Wilson, Gayathri B. Gange, Emily L. Barth, Richard T. Ly, Olivia M. Manley, Kelly L. Forrester, Stavros G. Karakalos, Mark D. Smith, Thomas M. Makris, Aaron K. Vannucci, Dmitry Peryshkov, Natalia B. Shustova
Summary: The ability to tune metal oxidation states in metal-organic frameworks (MOFs) by switching between two discrete linker photoisomers via an external stimulus was investigated for the first time. Various experimental methods were used to confirm the reversible photoswitching activity and determine the photochromic moieties' role in tuning the oxidation state.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Shuo Liu, Chaochao Dun, Junjie Chen, Satyarit Rao, Mihir Shah, Jilun Wei, Kaiwen Chen, Zhengxi Xuan, Eleni A. Kyriakidou, Jeffrey J. Urban, Mark T. Swihart
Summary: Mesoporous silica is a versatile material that can be synthesized with hollow structure and high specific surface area using a flame aerosol method. It can be used to produce mesoporous nanoshell-supported nanocatalysts with active nanoclusters for improved catalytic performance in various reactions.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Materials Science, Ceramics
Mackenzie Ridley, Kenneth Kane, Michael Lance, Cory Parker, Yi-Feng Su, Sanjay Sampath, Eugenio Garcia, Marshall Sweet, Molly O'Connor, Bruce Pint
Summary: This study compares the microstructure evolution and steam oxidation kinetics of Si-bond coatings beneath (Y/Yb)DS and YbDS/YbMS EBCs. The results show that the steam oxidation rate of (Y/Yb)DS EBC is reduced compared to YbDS/YbMS.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Multidisciplinary Sciences
Tanner L. Cox, Michael J. Lance, Lindsey K. Albertson, Michelle A. Briggs, Adeline J. Dutton, Alexander V. Zale
Summary: Species assemblages of native and non-native fishes are common in freshwater systems worldwide, and the presence of non-native species may lead to negative impacts on native species through interspecific competition. In the Smith River watershed, rainbow trout were introduced by 1930, and since then, native mountain whitefish and non-native rainbow trout have likely coexisted. However, limited knowledge exists on their competition for food resources. This study quantified the diet compositions of rainbow trout and mountain whitefish in the Smith River and its tributary, Sheep Creek, revealing high diet overlap between the two species in the Smith River, indicating potential resource competition. Despite the overlap, some resource partitioning was observed, suggesting possible mechanisms for coexistence.
Article
Engineering, Mechanical
Daekun Kim, Todd J. Toops, Ke Nguyen, Michael J. Lance, Jun Qu
Summary: The impact of a boron-containing lubricant oil additive (BR) on the performance of a Pd/Rh-based three-way catalyst (TWC) is investigated and compared with the effects of no additive (NA) and the industry standard zinc dialkyl-dithiophosphate (ZDDP). Accelerated aging of the catalysts using a genset shows that the BR-aged TWC exhibits similar reactivity to the NA-aged TWC, while the ZDDP-aged TWC shows increased reactivity for certain gas species. Analytical techniques reveal the presence of boron in the BR-aged TWC samples, but no boron-related peaks are observed in the XRD pattern.
Article
Chemistry, Physical
Chih-Han Liu, Stephen Porter, Junjie Chen, Hien Pham, Eric J. Peterson, Prateek Khatri, Todd J. Toops, Abhaya Datye, Eleni A. Kyriakidou
Summary: In this study, the diesel oxidation performance of different Pd/Pt molar ratio catalysts under degreened (DG) and hydrothermally aged conditions was evaluated. It was found that Pd/Pt(1/3)/SiO2@Zr (DG) achieved the lowest temperature for CO and THCs conversion compared to other catalysts studied, indicating enhanced low temperature performance.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Nanoscience & Nanotechnology
Junjie Chen, Hien N. Pham, Tala Mon, Todd J. Toops, Abhaya K. Datye, Zhenglong Li, Eleni A. Kyriakidou
Summary: Catalytic oxidation of CH4 over nonprecious Ni/CeO2 catalysts with different CeO2 support morphologies (nanoparticles (P), rods (R), cubes (C)) and synthetic procedures (precipitation, sol-gel (SG)) was studied. The relationship among CeO2 morphologies, redox properties, surface areas, and CH4 oxidation activity was established. CeO2-R support showed higher oxygen vacancies, improved OSC and CH4 oxidation activity compared to CeO2-P and CeO2-C supports. The same activity pattern was observed for Ni containing catalysts (Ni/CeO2-R > Ni/CeO2-P > Ni/CeO2-C). Increasing CeO2 surface area by sol-gel synthesis method (CeO2-SG) improved the CH4 oxidation performance of CeO2-SG and Ni/CeO2-SG compared to CeO2-R and Ni/CeO2-R, respectively. All studied Ni/CeO2 nanocatalysts showed improved hydrothermal stability compared to conventional Pd/Al2O3.
ACS APPLIED NANO MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Chanaka Kumara, Michael J. Lance, Jun Qu
Summary: This study presents the achievement of ultra-low coefficient of friction (COF) between steel surfaces by using a sacrificial coating composed of vertically-aligned carbon nanotubes (CNTs) under non-polar oil lubrication. The presence of graphene-containing tribofilms formed during running-in contributes to the superlubricity. The results demonstrate the feasibility and sustainability of achieving macroscale superlubricity in ambient environments.
MATERIALS TODAY NANO
(2023)
Article
Chemistry, Physical
Anhua Dong, Abolfazl Shakouri, Starvros Karakalos, Doug Blom, Christopher T. Williams, John R. Regalbuto
Summary: Supported, dilute Pd-in-Au alloyed nanoparticles were synthesized via simultaneous strong electrostatic adsorption, exhibiting enhanced reactivity. The ultrasmall nanoparticles with homogeneous alloying were confirmed by X-ray diffraction, CO chemisorption, and scanning transmission electron microscopy. Quantitative analysis of CO adsorption showed the disappearance of contiguous Pd surface ensembles with increasing dilution. Catalysts consisting of exclusively isolated Pd sites achieved significantly higher turnover frequencies than pure Pd or Au catalysts.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Hassina Tabassum, Shreya Mukherjee, Junjie Chen, Domoina Holiharimanana, Stavros Karakalos, Xiaoxuan Yang, Sooyeon Hwang, Tianyu Zhang, Bo Lu, Min Chen, Zhong Tang, Eleni A. Kyriakidou, Qingfeng Ge, Gang Wu
Summary: In this study, a Ru-free catalyst was designed with optimal interfaces between alloy nanoparticles and oxide support, resulting in improved NH3 conversion efficiency and long-term stability.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Engineering, Environmental
Jungkuk Lee, Junjie Chen, Kevin Giewont, Tala Mon, Chih-Han Liu, Eric A. Walker, Eleni A. Kyriakidou
Summary: This study evaluated bimetallic PdCo/BEA zeolites as potential passive NOx adsorbers in the presence of carbon monoxide. The behavior of PdCo/BEA catalysts was found to be different from monometallic Pd/BEA, attributed to the formation and suppression of PdO during adsorption/desorption cycles.
CHEMICAL ENGINEERING JOURNAL
(2022)
