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Chakarova KK, Mihaylov MY, Karapenchev BS, Koleva IZ, Vayssilov GN, Aleksandrov HA, Hadjiivanov KI. N 2 as an Efficient IR Probe Molecule for the Investigation of Ceria-Containing Materials. Molecules 2024; 29:3608. [PMID: 39125011 PMCID: PMC11314509 DOI: 10.3390/molecules29153608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2024] [Revised: 07/26/2024] [Accepted: 07/29/2024] [Indexed: 08/12/2024] Open
Abstract
Ceria and ceria-based catalysts are very important in redox and acid-base catalysis. Nanoceria have also been found to be important in biomedical applications. To design efficient materials, it is necessary to thoroughly understand the surface chemistry of ceria, and one of the techniques that provides such information about the surface is the vibrational spectroscopy of probe molecules. Although the most commonly used probe is CO, it has some disadvantages when applied to ceria and ceria-based catalysts. CO can easily reduce the material, forming carbonate-like species, and can be disproportionate, thus modifying the surface. Here, we offer a pioneering study of the adsorption of 15N2 at 100 K, demonstrating that dinitrogen can be more advantageous than CO when studying ceria-based materials. As an inert gas, N2 is not able to oxidize or reduce cerium cations and does not form any surface anionic species able to modify the surface. It is infrared and transparent, and thus there is no need to subtract the gas phase spectrum, something that often increases the noise level. Being a weaker base than CO, N2 has a negligible induction effect. By using stoichiometric nano-shaped ceria samples, we concluded that 15N2 can distinguish between surface Ce4+ sites on different, low index planes; with cations on the {110} facets and on some of the edges, Ce4+-15N2 species with IR bands at 2258-2257 cm-1 are formed. Bridging species, where one of the N atoms from the molecule interacts with two Ce4+ cations, are formed on the {100} facets (2253-2252 cm-1), while the interaction with the {111} facets is very weak and does not lead to the formation of measurable amounts of complexes. All species are formed by electrostatic interaction and disappear during evacuation at 100 K. In addition, N2 provides more accurate information than CO on the acidity of the different OH groups because it does not change the binding mode of the hydroxyls.
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Affiliation(s)
- Kristina K. Chakarova
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; (B.S.K.); (H.A.A.); (K.I.H.)
| | - Mihail Y. Mihaylov
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; (B.S.K.); (H.A.A.); (K.I.H.)
| | - Bayan S. Karapenchev
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; (B.S.K.); (H.A.A.); (K.I.H.)
- Faculty of Chemistry and Pharmacy, University of Sofia, 1126 Sofia, Bulgaria; (I.Z.K.); (G.N.V.)
| | - Iskra Z. Koleva
- Faculty of Chemistry and Pharmacy, University of Sofia, 1126 Sofia, Bulgaria; (I.Z.K.); (G.N.V.)
| | - Georgi N. Vayssilov
- Faculty of Chemistry and Pharmacy, University of Sofia, 1126 Sofia, Bulgaria; (I.Z.K.); (G.N.V.)
| | - Hristiyan A. Aleksandrov
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; (B.S.K.); (H.A.A.); (K.I.H.)
- Faculty of Chemistry and Pharmacy, University of Sofia, 1126 Sofia, Bulgaria; (I.Z.K.); (G.N.V.)
| | - Konstantin I. Hadjiivanov
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; (B.S.K.); (H.A.A.); (K.I.H.)
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Wang H, Yao R, Zhang R, Ma H, Gao J, Liang M, Zhao Y, Miao Z. CeO 2-Supported TiO 2-Pt Nanorod Composites as Efficient Catalysts for CO Oxidation. Molecules 2023; 28:molecules28041867. [PMID: 36838854 PMCID: PMC9959209 DOI: 10.3390/molecules28041867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 02/04/2023] [Accepted: 02/09/2023] [Indexed: 02/18/2023] Open
Abstract
Supported Pt-based catalysts have been identified as highly selective catalysts for CO oxidation, but their potential for applications has been hampered by the high cost and scarcity of Pt metals as well as aggregation problems at relatively high temperatures. In this work, nanorod structured (TiO2-Pt)/CeO2 catalysts with the addition of 0.3 at% Pt and different atomic ratios of Ti were prepared through a combined dealloying and calcination method. XRD, XPS, SEM, TEM, and STEM measurements were used to confirm the phase composition, surface morphology, and structure of synthesized samples. After calcination treatment, Pt nanoparticles were semi-inlayed on the surface of the CeO2 nanorod, and TiO2 was highly dispersed into the catalyst system, resulting in the formation of (TiO2-Pt)/CeO2 with high specific surface area and large pore volume. The unique structure can provide more reaction path and active sites for catalytic CO oxidation, thus contributing to the generation of catalysts with high catalytic activity. The outstanding catalytic performance is ascribed to the stable structure and proper TiO2 doping as well as the combined effect of Pt, TiO2, and CeO2. The research results are of importance for further development of high catalytic performance nanoporous catalytic materials.
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Affiliation(s)
- Haiyang Wang
- Xi’an Key Laboratory of Advanced Photo-Electronics Materials and Energy Conversion Device, School of Electronic Information, Xijing University, Xi’an 710123, China
| | - Ruijuan Yao
- Xi’an Key Laboratory of Advanced Photo-Electronics Materials and Energy Conversion Device, School of Electronic Information, Xijing University, Xi’an 710123, China
| | - Ruiyin Zhang
- Xi’an Key Laboratory of Advanced Photo-Electronics Materials and Energy Conversion Device, School of Electronic Information, Xijing University, Xi’an 710123, China
| | - Hao Ma
- Xi’an Key Laboratory of Advanced Photo-Electronics Materials and Energy Conversion Device, School of Electronic Information, Xijing University, Xi’an 710123, China
| | - Jianjing Gao
- Xi’an Key Laboratory of Advanced Photo-Electronics Materials and Energy Conversion Device, School of Electronic Information, Xijing University, Xi’an 710123, China
| | - Miaomiao Liang
- School of Materials Science and Engineering, Xi’an Polytechnic University, Xi’an 710048, China
| | - Yuzhen Zhao
- Xi’an Key Laboratory of Advanced Photo-Electronics Materials and Energy Conversion Device, School of Electronic Information, Xijing University, Xi’an 710123, China
| | - Zongcheng Miao
- Xi’an Key Laboratory of Advanced Photo-Electronics Materials and Energy Conversion Device, School of Electronic Information, Xijing University, Xi’an 710123, China
- School of Artificial Intelligence, Optics and Electronics (iOPEN), Northwestern Polytechnical University, Xi’an 710072, China
- Correspondence:
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3
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Yu H, Qi X, Du X, Pan Y, Feng X, Shan W, Xiong Y. The preparation of 3.0F-Co3O4 catalyst with “Yardang Landform” structure and its performance for catalyzing N2O decomposition. MOLECULAR CATALYSIS 2023. [DOI: 10.1016/j.mcat.2023.112960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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4
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Salusso D, Mauri S, Deplano G, Torelli P, Bordiga S, Rojas-Buzo S. MOF-Derived CeO 2 and CeZrO x Solid Solutions: Exploring Ce Reduction through FTIR and NEXAFS Spectroscopy. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:272. [PMID: 36678025 PMCID: PMC9865843 DOI: 10.3390/nano13020272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2022] [Revised: 12/30/2022] [Accepted: 01/05/2023] [Indexed: 06/17/2023]
Abstract
The development of Ce-based materials is directly dependent on the catalyst surface defects, which is caused by the calcination steps required to increase structural stability. At the same time, the evaluation of cerium's redox properties under reaction conditions is of increasing relevant importance. The synthesis of Ce-UiO-66 and CeZr-UiO-66 and their subsequent calcination are presented here as a simple and inexpensive approach for achieving homogeneous and stable CeO2 and CeZrOx nanocrystals. The resulting materials constitute an ideal case study to thoroughly understand cerium redox properties. The Ce3+/Ce4+ redox properties are investigated by H2-TPR experiments exploited by in situ FT-IR and Ce M5-edge AP-NEXAFS spectroscopy. In the latter case, Ce3+ formation is quantified using the MCR-ALS protocol. FT-IR is then presented as a high potential/easily accessible technique for extracting valuable information about the cerium oxidation state under operating conditions. The dependence of the OH stretching vibration frequency on temperature and Ce reduction is described, providing a novel tool for qualitative monitoring of surface oxygen vacancy formation. Based on the reported results, the molecular absorption coefficient of the Ce3+ characteristic IR transition is tentatively evaluated, thus providing a basis for future Ce3+ quantification through FT-IR spectroscopy. Finally, the FT-IR limitations for Ce3+ quantification are discussed.
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Affiliation(s)
- Davide Salusso
- Department of Chemistry, NIS Center and INSTM Reference Center, University of Turin, 10125 Turin, Italy
- European Synchrotron Radiation Facility, CS 40220, CEDEX 9, 38043 Grenoble, France
| | - Silvia Mauri
- IOM CNR Laboratorio TASC, AREA Science Park, Basovizza, 34149 Trieste, Italy
- Department of Physics, University of Trieste, Via Valerio 2, 34127 Trieste, Italy
| | - Gabriele Deplano
- Department of Chemistry, NIS Center and INSTM Reference Center, University of Turin, 10125 Turin, Italy
| | - Piero Torelli
- IOM CNR Laboratorio TASC, AREA Science Park, Basovizza, 34149 Trieste, Italy
| | - Silvia Bordiga
- Department of Chemistry, NIS Center and INSTM Reference Center, University of Turin, 10125 Turin, Italy
| | - Sergio Rojas-Buzo
- Department of Chemistry, NIS Center and INSTM Reference Center, University of Turin, 10125 Turin, Italy
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Shlapa Y, Solopan S, Sarnatskaya V, Siposova K, Garcarova I, Veltruska K, Timashkov I, Lykhova O, Kolesnik D, Musatov A, Nikolaev V, Belous A. Cerium dioxide nanoparticles synthesized via precipitation at constant pH: Synthesis, physical-chemical and antioxidant properties. Colloids Surf B Biointerfaces 2022; 220:112960. [DOI: 10.1016/j.colsurfb.2022.112960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 09/22/2022] [Accepted: 10/20/2022] [Indexed: 11/05/2022]
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Pal Y, Mahottamananda SN, S S, Palateerdham SK, Ingenito A. Thermal decomposition kinetics and combustion performance of paraffin-based fuel in the presence of CeO2 catalyst. FIREPHYSCHEM 2022. [DOI: 10.1016/j.fpc.2022.10.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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7
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Lee KM, Brito M, DeCoster J, Linskens K, Mehdi K, Lee WI, Kim E, Kim H, Kwon G, Nam CY, Kim T. Influence of oxidizing and reducing pretreatment on the catalytic performance of CeO2 for CO oxidation. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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8
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Commemorative Issue in Honor of Professor Gerhard Ertl on the Occasion of His 85th Birthday. Catalysts 2022. [DOI: 10.3390/catal12060624] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
This Special Issue (SI) is dedicated to Professor Gerhard Ertl on his eighty-fifth birthday [...]
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9
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Wang Y, Zhang Y, Jiang Q, Guo S, Baiker A, Li G. Ternary CuCrCeOx Solid Solution Enhances N2‐Selectivity in the NO Reduction with CO in the Presence of Water and Oxygen. ChemCatChem 2022. [DOI: 10.1002/cctc.202200203] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yuhang Wang
- Shenyang Normal University Institute of Catalysis for Energy and Environment CHINA
| | - Yifei Zhang
- Shenyang Normal University Institute of Catalysis for Energy and Environment 110034 Shenyang CHINA
| | - Qike Jiang
- Dalian Institute of Chemical Physics State Key Laboratory of Catalysis State Key Laboratory of Catalysis CHINA
| | - Song Guo
- Dalian Institute of Chemical Physics State Key Laboratory of Catalysis State Key Laboratory of Catalysis CHINA
| | - Alfons Baiker
- ETH Zurich: Eidgenossische Technische Hochschule Zurich Department of Chemistry and Applied Biosciences Wolfgang Pauli Strasse 12 CH-8093 Zürich SWITZERLAND
| | - Gao Li
- Dalian Institute of Chemical Physics State Key Laboratory of Catalysis State Key Laboratory of Catalysis CHINA
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10
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Wen Y, Huang Q, Zhang Z, Huang W. Morphology‐Dependent
Catalysis of
CeO
2
‐Based
Nanocrystal Model Catalysts. CHINESE J CHEM 2022. [DOI: 10.1002/cjoc.202200147] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yang Wen
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry Zhejiang Normal University Jinhua 321004 People's Republic of China
| | - Qiuyu Huang
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry Zhejiang Normal University Jinhua 321004 People's Republic of China
| | - Zhenhua Zhang
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry Zhejiang Normal University Jinhua 321004 People's Republic of China
| | - Weixin Huang
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Cataly‐sis of Anhui Higher Education Institutes and Department of Chemical Physics University of Science and Technology of China Hefei 230026 People's Republic of China
- Dalian National Laboratory for Clean Energy Chinese Academy of Sciences Dalian 116023 People's Republic of China
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11
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Wei Y, Li Y, Han D, Liu J, Lyu S, Li C, Tan Y, Wang Z, Yu J. Facile strategy to construct porous CuO/CeO2 nanospheres with enhanced catalytic activity toward CO catalytic oxidation at low temperature. APPLIED NANOSCIENCE 2022. [DOI: 10.1007/s13204-021-02334-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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12
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Maurer F, Beck A, Jelic J, Wang W, Mangold S, Stehle M, Wang D, Dolcet P, Gänzler AM, Kübel C, Studt F, Casapu M, Grunwaldt JD. Surface Noble Metal Concentration on Ceria as a Key Descriptor for Efficient Catalytic CO Oxidation. ACS Catal 2022. [DOI: 10.1021/acscatal.1c04565] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Florian Maurer
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
| | - Arik Beck
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
| | - Jelena Jelic
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Wu Wang
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Stefan Mangold
- Institute for Photon Science and Synchrotron Radiation (IPS), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Matthias Stehle
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
| | - Di Wang
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Paolo Dolcet
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
| | - Andreas M. Gänzler
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
| | - Christian Kübel
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Felix Studt
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Maria Casapu
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
| | - Jan-Dierk Grunwaldt
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
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Papatheodorou G, Ntzoufra P, Hapeshi E, Vakros J, Mantzavinos D. Hybrid Biochar/Ceria Nanomaterials: Synthesis, Characterization and Activity Assessment for the Persulfate-Induced Degradation of Antibiotic Sulfamethoxazole. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:194. [PMID: 35055213 PMCID: PMC8778396 DOI: 10.3390/nano12020194] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/02/2022] [Accepted: 01/05/2022] [Indexed: 12/10/2022]
Abstract
Biochar from spent malt rootlets was employed as the template to synthesize hybrid biochar-ceria materials through a wet impregnation method. The materials were tested for the activation of persulfate (SPS) and subsequent degradation of sulfamethoxazole (SMX), a representative antibiotic, in various matrices. Different calcination temperatures in the range 300-500 °C were employed and the resulting materials were characterized by means of N2 adsorption and potentiometric mass titration as well as TGA, XRD, SEM, FTIR, DRS, and Raman spectroscopy. Calcination temperature affects the biochar content and the physicochemical properties of the hybrid materials, which were tested for the degradation of 500 μg L-1 SMX with SPS (in the range 200-500 mg L-1) in various matrices including ultrapure water (UPW), bottled water, wastewater, and UPW spiked with bicarbonate, chloride, or humic acid. Materials calcined at 300-350 °C, with a surface area of ca. 120 m2 g-1, were the most active, yielding ca. 65% SMX degradation after 120 min of reaction in UPW; materials calcined at higher temperatures as well as bare biochar were less active. Degradation decreased with increasing matrix complexity due to the interactions amongst the surface, the contaminant, and the oxidant. Experiments in the presence of scavengers (i.e., methanol, t-butanol, and sodium azide) revealed that sulfate and hydroxyl radicals as well as singlet oxygen were the main oxidative species.
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Affiliation(s)
- Golfo Papatheodorou
- Department of Chemical Engineering, University of Patras, Caratheodory 1, University Campus, GR-26504 Patras, Greece; (G.P.); (P.N.)
| | - Paraskevi Ntzoufra
- Department of Chemical Engineering, University of Patras, Caratheodory 1, University Campus, GR-26504 Patras, Greece; (G.P.); (P.N.)
| | - Evroula Hapeshi
- Department of Life and Health Sciences, School of Sciences and Engineering, University of Nicosia, Nicosia 2417, Cyprus;
| | - John Vakros
- Department of Chemical Engineering, University of Patras, Caratheodory 1, University Campus, GR-26504 Patras, Greece; (G.P.); (P.N.)
| | - Dionissios Mantzavinos
- Department of Chemical Engineering, University of Patras, Caratheodory 1, University Campus, GR-26504 Patras, Greece; (G.P.); (P.N.)
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Lucchetti LEB, de Almeida JM, Autreto PAS, Santos MC. Assessing the oxygen reduction reaction by a 2-electron mechanism on ceria surfaces. Phys Chem Chem Phys 2021; 23:18580-18587. [PMID: 34612394 DOI: 10.1039/d1cp03007h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The 2-electron pathway of the oxygen reduction reaction is an unwanted process in the development of fuel cells. In contrast, it has gained the scientific community's attention due to its importance as a promising way of removing emergent pollutants and endocrine disruptors from water bodies and a more sustainable alternative for large-scale commercial hydrogen peroxide production. Cerium oxide has shown remarkable potential and selectivity experimentally for this mechanism, and its possible applications, exceeding the previous reference materials. In this work, we studied the 2-electron pathway for oxygen reduction on different ceria-cleaving directions (100), (110), (221), and (331) by first principles methods based on density functional theory. Our results show that the (100) surface is the most favorable for reduction, with the (331) crystallographic plane also showing potential for good catalytic activity. This fact could be essential for designing new nanostructures, with higher portions of those planes exposed, for higher catalytic activity.
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Affiliation(s)
- Lanna E B Lucchetti
- Laboratório de Eletroquímica e Materiais Nanoestruturados (LEMN) - Centro de Ciências Naturais e Humanas (CCNH), Universidade Federal do ABC (UFABC), Rua Santa Adélia 166, Bairro Bangu, 09210-170, Santo André- SP, Brazil.
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15
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Rational Design of Non-Precious Metal Oxide Catalysts by Means of Advanced Synthetic and Promotional Routes. Catalysts 2021. [DOI: 10.3390/catal11080895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Catalysis is an indispensable part of our society, involved in numerous energy and environmental applications, such as the production of value-added chemicals/fuels, hydrocarbons processing, fuel cells applications, abatement of hazardous pollutants, among others [...]
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16
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Shape Effects of Ceria Nanoparticles on the Water‒Gas Shift Performance of CuOx/CeO2 Catalysts. Catalysts 2021. [DOI: 10.3390/catal11060753] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The copper–ceria (CuOx/CeO2) system has been extensively investigated in several catalytic processes, given its distinctive properties and considerable low cost compared to noble metal-based catalysts. The fine-tuning of key parameters, e.g., the particle size and shape of individual counterparts, can significantly affect the physicochemical properties and subsequently the catalytic performance of the binary oxide. To this end, the present work focuses on the morphology effects of ceria nanoparticles, i.e., nanopolyhedra (P), nanocubes (C), and nanorods (R), on the water–gas shift (WGS) performance of CuOx/CeO2 catalysts. Various characterization techniques were employed to unveil the effect of shape on the structural, redox and surface properties. According to the acquired results, the support morphology affects to a different extent the reducibility and mobility of oxygen species, following the trend: R > P > C. This consequently influences copper–ceria interactions and the stabilization of partially reduced copper species (Cu+) through the Cu2+/Cu+ and Ce4+/Ce3+ redox cycles. Regarding the WGS performance, bare ceria supports exhibit no activity, while the addition of copper to the different ceria nanostructures alters significantly this behaviour. The CuOx/CeO2 sample of rod-like morphology demonstrates the best catalytic activity and stability, approaching the thermodynamic equilibrium conversion at 350 °C. The greater abundance in loosely bound oxygen species, oxygen vacancies and highly dispersed Cu+ species can be mainly accounted for its superior catalytic performance.
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