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Borges Serra AR, Castro de Sousa G, de Carvalho Gomes V, Alves de Sousa Filho I, Grisolia CK, Zhao B, Walton RI, Serra OA. Enhancing photocatalytic tetracycline degradation through the fabrication of high surface area CeO 2 from a cerium-organic framework. RSC Adv 2024; 14:17507-17518. [PMID: 38818361 PMCID: PMC11138135 DOI: 10.1039/d4ra02640c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2024] [Accepted: 05/16/2024] [Indexed: 06/01/2024] Open
Abstract
Water pollution is a global environmental issue, and the presence of pharmaceutical compounds, such as tetracyclines (TCs), in aquatic ecosystems has raised growing concerns due to the potential risks to both the environment and human health. A high surface area CeO2 was prepared via atmospheric thermal treatment of a metal-organic framework of cerium and benzene-1,3,5-tricarboxylate. The effects of calcination temperature on the morphology, structure, light absorption properties and tetracycline removal efficiency were studied. The best activity of the photocatalysts could be achieved when the heat treatment temperature is 300 °C, which enhances the photocatalytic degradation performance towards tetracycline under visible light. The resulting CeO2 particles have high capacity for adsorbing TCs from aqueous solution: 90 mg g-1 for 60 mg L-1 TCs. As a result, 98% of the initial TC can be removed under simulated sunlight irradiation. The cooperation of moderate defect concentration and disordered structure showed tetracycline removal activity about 10 times higher than the initial Ce-MOF. An embryotoxicity assessment on zebrafish revealed that treatment with CeO2 particles significantly decreased the toxicity of TC solutions.
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Affiliation(s)
- Ayla Roberta Borges Serra
- Department of Chemistry and Chemical Engineering, University Federal of São Carlos São Carlos Brazil
| | | | | | | | - Cesar Koppe Grisolia
- Department of Genetics and Morphology, Institute of Biological Sciences, University Brasilia-UnB Brasilia Brazil
| | - Baiwen Zhao
- Department of Chemistry, University of Warwick Coventry CV4 7AL UK
| | - Richard I Walton
- Department of Chemistry, University of Warwick Coventry CV4 7AL UK
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2
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Sun Y, Fang S, Xu J, Zhang T, Wu Z, Li J, Gao E, Wang W, Dai L, Liu W, Zhang B, Zhang J, Yao S, Zhu J. Unveiling the Surface Chemical Reactions during Multi-Phase Catalytic Oxidation of Soot on Nanoengineering/Interfacing/Doping-Prepared Mn-CeO 2 Catalysts Using TG-MS and Operando DRIFTS-MS. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:15773-15784. [PMID: 37883132 DOI: 10.1021/acs.langmuir.3c02409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2023]
Abstract
The aerosol pyrolysis method from nitrate precursors was used to prepare the Mn-CeO2 catalyst containing Mn2O3, CeO2, and Mn-doped CeO2 nanoparticles for catalyzing carbonous soot oxidation. The prepared Mn-CeO2 catalysts have high specific surface areas, Ce3+ ratio, and oxygen vacancy defects; these are a benefit for soot oxidation. The T50 for soot oxidation on the 0.57Mn-CeO2 catalyst is as low as 355 °C, which is 329 °C lower than that for soot oxidation without a catalyst. The catalysts were characterized using XRD, SEM-EDS, HRTEM, XPS, Raman spectroscopy, H2-TPR-MS, O2-TPD-MS, soot-TPR-MS, and operando DRIFTS-MS. The functions of Mn2O3, CeO2, and Mn-doped CeO2 in the 0.57Mn-CeO2 catalyst are unveiled. Mn-doped CeO2 plays a key role and CeO2 participates in soot oxidation, while Mn2O3 is used to enhance higher ratios of Ce3+, via the reaction of Mn3+ + Ce4+ = Mn4+ + Ce3+. The mechanism of soot oxidation on Mn-CeO2 was proposed.
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Affiliation(s)
- Yan Sun
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China
| | - Shiyu Fang
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China
| | - Jiacheng Xu
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China
- School of Material Science and Engineering, Changzhou University, Changzhou 213164, China
| | - Tiantian Zhang
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China
| | - Zuliang Wu
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China
- Key Laboratory of Advanced Plasma Catalysis Engineering for China Petrochemical Industry, Changzhou 213164, China
| | - Jing Li
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China
- Key Laboratory of Advanced Plasma Catalysis Engineering for China Petrochemical Industry, Changzhou 213164, China
| | - Erhao Gao
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China
- Key Laboratory of Advanced Plasma Catalysis Engineering for China Petrochemical Industry, Changzhou 213164, China
| | - Wei Wang
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China
- Key Laboratory of Advanced Plasma Catalysis Engineering for China Petrochemical Industry, Changzhou 213164, China
| | - Lianxin Dai
- Jiangxi Xintai Functional Materials Technology Co., Ltd., Ji'an, Jiangxi 343100, China
| | - Weihua Liu
- Jiangxi Xintai Functional Materials Technology Co., Ltd., Ji'an, Jiangxi 343100, China
| | - Buhe Zhang
- Jiangxi Xintai Functional Materials Technology Co., Ltd., Ji'an, Jiangxi 343100, China
| | - Junwei Zhang
- Jiangxi Xintai Functional Materials Technology Co., Ltd., Ji'an, Jiangxi 343100, China
| | - Shuiliang Yao
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China
- School of Material Science and Engineering, Changzhou University, Changzhou 213164, China
- Key Laboratory of Advanced Plasma Catalysis Engineering for China Petrochemical Industry, Changzhou 213164, China
| | - Jiali Zhu
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China
- Key Laboratory of Advanced Plasma Catalysis Engineering for China Petrochemical Industry, Changzhou 213164, China
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3
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Lima Oliveira R, Ledwa KA, Chernyayeva O, Praetz S, Schlesiger C, Kepinski L. Cerium Oxide Nanoparticles Confined in Doped Mesoporous Carbons: A Strategy to Produce Catalysts for Imine Synthesis. Inorg Chem 2023; 62:13554-13565. [PMID: 37555784 DOI: 10.1021/acs.inorgchem.3c01985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/10/2023]
Abstract
A group of (doped N or P) carbons were synthesized using soluble starch as a carbon precursor. Further, ceria nanoparticles (NPs) were confined into these (doped) carbon materials. The obtained solids were characterized by various techniques such as N2 physisorption, XRD, TEM, SEM, XPS, and XAS. These materials were used as catalysts for the oxidative coupling between benzyl alcohol and aniline as the model reaction. Ceria immobilized on mesoporous-doped carbon shows higher activity than the other materials, benchmark catalysts, and most of the previously reported catalysts. The control of the ceria NP size, the presence of Ce3+ cations, and an increment in the disorder in the ceria NP structure caused by a support-ceria interaction could increase the number of oxygen vacancies and improve its catalytic performance. CN-meso/CeO2 was also used as the catalyst for a rich scope of substrates, such as substituted aromatic alcohols, linear alcohols, and different types of amines. The influence of various reaction parameters (substrate content, reaction temperature, and catalyst content) on the activity of this catalyst was also checked.
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Affiliation(s)
- Rafael Lima Oliveira
- Institute of Low Temperature and Structure Research of the Polish Academy of Sciences, 50-422 Wroclaw, Poland
| | - Karolina A Ledwa
- Institute of Low Temperature and Structure Research of the Polish Academy of Sciences, 50-422 Wroclaw, Poland
| | - Olga Chernyayeva
- Institute of Physical Chemistry of the Polish Academy of Sciences, 01-224 Warsaw, Poland
| | - Sebastian Praetz
- Department of Optics and Atomic Physics, Technische Universitat Berlin, 10623 Berlin, Germany
| | - Christopher Schlesiger
- Department of Optics and Atomic Physics, Technische Universitat Berlin, 10623 Berlin, Germany
| | - Leszek Kepinski
- Institute of Low Temperature and Structure Research of the Polish Academy of Sciences, 50-422 Wroclaw, Poland
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4
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Peng C, Yu D, Zhang C, Chen M, Wang L, Yu X, Fan X, Zhao Z, Cheng K, Chen Y, Wei Y, Liu J. Alkali/alkaline-earth metal-modified MnO x supported on three-dimensionally ordered macroporous-mesoporous Ti xSi 1-xO 2 catalysts: Preparation and catalytic performance for soot combustion. J Environ Sci (China) 2023; 125:82-94. [PMID: 36375963 DOI: 10.1016/j.jes.2021.10.029] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Revised: 10/25/2021] [Accepted: 10/27/2021] [Indexed: 06/16/2023]
Abstract
The performance of catalysts used in after-treatment systems is the key factor for the removal of diesel soot, which is an important component of atmospheric fine particle emissions. Herein, three-dimensionally ordered macroporous-mesoporous TixSi1-xO2 (3DOM-m TixSi1-xO2) and its supported MnOx catalysts doped with different alkali/alkaline-earth metals (AMnOx/3DOM-m Ti0.7Si0.3O2 (A: Li, Na, K, Ru, Cs, Mg, Ca, Sr, Ba)) were prepared by mesoporous template (P123)-assisted colloidal crystal template (CCT) and incipient wetness impregnation methods, respectively. Physicochemical characterizations of the catalysts were performed using scanning electron microscopy, X-ray diffraction, N2 adsorption-desorption, H2 temperature-programmed reduction, O2 temperature-programmed desorption, NO temperature-programmed oxidation, and Raman spectroscopy techniques; then, we evaluated their catalytic performances for the removal of diesel soot particles. The results show that the 3DOM-m Ti0.7Si0.3O2 supports exhibited a well-defined 3DOM-m nanostructure, and AMnOx nanoparticles with 10-50 nm were evenly dispersed on the inner walls of the uniform macropores. In addition, the as-prepared catalysts exhibited good catalytic performance for soot combustion. Among the prepared catalysts, CsMnOx/3DOM-m Ti0.7Si0.3O2 had the highest catalytic activity for soot combustion, with T10, T50, and T90 (the temperatures corresponding to soot conversion rates of 10%, 50%, and 90%) values of 285, 355, and 393°C, respectively. The high catalytic activity of the CsMnOx/3DOM-m Ti0.7Si0.3O2 catalysts was attributed to their excellent low-temperature reducibility and homogeneous macroporous-mesoporous structure, as well as to the synergistic effects between Cs and Mn species and between CsMnOx and the Ti0.7Si0.3O2 support.
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Affiliation(s)
- Chao Peng
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, China
| | - Di Yu
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, China
| | - Chunlei Zhang
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, China
| | - Maozhong Chen
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, China
| | - Lanyi Wang
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
| | - Xuehua Yu
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, China.
| | - Xiaoqiang Fan
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, China
| | - Zhen Zhao
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, China; State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China.
| | - Kai Cheng
- Energy and Catalysis Laboratory, Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Hong Kong, China
| | - Yongsheng Chen
- Energy and Catalysis Laboratory, Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Hong Kong, China
| | - Yuechang Wei
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
| | - Jian Liu
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
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5
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Chen D, Su Z, Si W, Qu Y, Zhao X, Liu H, Yang Y, Wang Y, Peng Y, Chen J, Li J. Boosting CO Catalytic Oxidation Performance via Highly Dispersed Copper Atomic Clusters: Regulated Electron Interaction and Reaction Pathways. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:2928-2938. [PMID: 36752384 DOI: 10.1021/acs.est.2c07687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Copper-loaded ceria (Cu/CeO2) catalysts have become promising for the catalytic oxidation of industrial CO emissions. Since their superior redox property mainly arises from the synergistic effect between Cu and the CeO2 support, the dispersion state of Cu species may dominate the catalytic performance of Cu/CeO2 catalysts: the extremely high or low dispersity is disadvantageous for the catalytic performance. The nanoparticle catalysts usually present few contact sites, while the single-atom catalysts tend to be passivated due to their relatively single valence state. To achieve a suitable dispersion state, we synthesized a superior Cu/CeO2 catalyst with Cu atomic clusters, realizing high atomic exposure and unit atomic activity simultaneously via favorable electron interaction and an anchoring effect. The catalyst reaches a 90% CO conversion at 130 °C, comparable to noble-metal catalysts. According to combined in situ spectroscopy and density functional theory calculations, the superior CO oxidation performance of the Cu atomic cluster catalyst results from the joint efforts of effective adsorption of CO at the electrophilic sites, the CO spillover phenomenon, and the efficient bicarbonate pathway triggered by hydroxyl. By providing a superior atomic cluster catalyst and uncovering the catalytic oxidation mechanism of Cu-Ce dual-active sites, our work may enlighten future research on industrial gaseous pollutant removal.
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Affiliation(s)
- Deli Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Ziang Su
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Wenzhe Si
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Yakun Qu
- Sinopec Research Institute of Petroleum Processing, Beijing 100083, China
| | - Xiaoguang Zhao
- Sinopec Research Institute of Petroleum Processing, Beijing 100083, China
| | - Hao Liu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Yu Yang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Yu Wang
- School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China
| | - Yue Peng
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Jianjun Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Junhua Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
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6
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Bendieb Aberkane A, Yeste MP, Djazi F, Cauqui MÁ. CO Methanation over NiO-CeO2 Mixed-Oxide Catalysts Prepared by a Modified Co-Precipitation Method: Effect of the Preparation pH on the Catalytic Performance. NANOMATERIALS 2022; 12:nano12152627. [PMID: 35957058 PMCID: PMC9370469 DOI: 10.3390/nano12152627] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 07/26/2022] [Accepted: 07/26/2022] [Indexed: 12/22/2022]
Abstract
In this study, a series of NiO-CeO2 mixed-oxide catalysts have been prepared by a modified co-precipitation method similar to the one used for the synthesis of hydrotalcites. The syntheses were carried out at different pH values (8, 9 and 10), in order to determine the influence of this synthetic variable on the properties of the obtained materials. These materials were characterized by using different techniques, such as TGA, XRD, ICP, N2 adsorption-desorption isotherms, H2 temperature-programmed reduction (H2-TPR), and electron microscopy, including high-angle annular dark-field transmission electron microscopy (HAADF-TEM) and EDS. The characterization results revealed the influence of the preparation method, in general, and of the pH value, in particular, on the textural properties of the oxides, as well as on the dispersion of the Ni species. The catalyst prepared at a higher pH value (pH = 10) was the one that exhibited better behavior in the CO methanation reaction (almost 100% CO conversion at 235 °C), which is attributed to the achievement, under these synthetic conditions, of a combination of properties (metal dispersion, specific surface area, porosity) more suitable for the reaction.
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Affiliation(s)
- Amar Bendieb Aberkane
- Laboratoire de Recherche sur la Physico-Chimie des Surfaces et Interfaces (LRPCSI), Faculté de Technologie, Département de Génie des Procédés, Université 20 Août 1955-Skikda, BP 26, Route d’El Hadaiek, Skikda 21000, Algeria;
- Correspondence: (A.B.A.); (M.Á.C.)
| | - María Pilar Yeste
- Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica, Universidad de Cádiz, Campus Río San Pedro s/n, 11510 Cádiz, Spain;
| | - Fayçal Djazi
- Laboratoire de Recherche sur la Physico-Chimie des Surfaces et Interfaces (LRPCSI), Faculté de Technologie, Département de Génie des Procédés, Université 20 Août 1955-Skikda, BP 26, Route d’El Hadaiek, Skikda 21000, Algeria;
| | - Miguel Ángel Cauqui
- Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica, Universidad de Cádiz, Campus Río San Pedro s/n, 11510 Cádiz, Spain;
- Correspondence: (A.B.A.); (M.Á.C.)
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7
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Impact of Hydrothermally Prepared Support on the Catalytic Properties of CuCe Oxide for Preferential CO Oxidation Reaction. Catalysts 2022. [DOI: 10.3390/catal12060674] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
CuCe mixed oxide is one of the most studied catalytic systems for preferential CO oxidation (CO-PrOx) for the purification of hydrogen-rich gas stream. In this study, a series of ceria supports were prepared via a citrates-hydrothermal route by altering the synthesis parameters (concentration and temperature). The resulting supports were used for the preparation of CuCe mixed-oxide catalysts via wet impregnation. Various physicochemical techniques were utilized for the characterization of the resulting materials, whereas the CuCe oxide catalysts were assessed in CO-PrOx reaction. Through the proper modification of the hydrothermal parameters, CeO2 supports with tunable properties can be formed, thus targeting the formation of highly active and selective catalysts. The nature of the reduced copper species and the optimum content in oxygen vacancies seems to be the key factors behind the remarkable catalytic performance of a CO-PrOx reaction.
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8
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Enhanced Oxygen Vacancies in Ce-Doped SnO2 Nanofibers for Highly Efficient Soot Catalytic Combustion. Catalysts 2022. [DOI: 10.3390/catal12060596] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
In this paper, cerium was incorporated into polyhydroxyltriacetictin (PHTES) using the sol-gel method combined with electrospinning technology to prepare a series of composite oxide fiber catalysts SnxCe1−xO2 in different proportions. The structures and soot catalytic activities of SnxCe1−xO2 fibers were studied under loose contact conditions. When Ce entered the crystal lattice of SnO2, the structural symmetry of the SnO2 was destroyed, which inhibited the crystallization and grain growth of the fiber, and fiber catalysts with a larger specific surface area were obtained. Moreover, the introduction of Ce improved the number of oxygen vacancies and redox ability of the catalyst, thus promoting the catalytic activity of the catalyst for soot particles. In particular, among them, the Sn0.7Ce0.3O2 fiber catalysts had the strongest catalytic oxidation ability regarding soot particles and could oxidize soot particles at a lower temperature and faster catalytic rate. The results of the temperature-programmed oxidation of Sn0.7Ce0.3O2 fiber catalyst, conducted three times under the same conditions, were basically consistent, indicating that the experimental results are reliable and repeatable. In addition, the Sn0.7Ce0.3O2 fiber catalyst showed good cycle stability.
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Shao J, Lan X, Zhang C, Cao C, Yu Y. Recent advances in soot combustion catalysts with designed micro-structures. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2021.08.057] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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10
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Surface Functionalization of Mesoporous Co3O4 and MnOx with Sodium for the Soot Oxidation Reaction. Top Catal 2022. [DOI: 10.1007/s11244-022-01595-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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11
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Broccoli-like CeO2 with Hierarchical/Porous Structures, and promoted oxygen vacancy as an enhanced catalyst for catalytic diesel soot elimination. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.119867] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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12
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Miran HA, Jaf ZN, Altarawneh M, Jiang ZT. An Insight into Geometries and Catalytic Applications of CeO 2 from a DFT Outlook. Molecules 2021; 26:6485. [PMID: 34770889 PMCID: PMC8588098 DOI: 10.3390/molecules26216485] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2021] [Revised: 10/19/2021] [Accepted: 10/21/2021] [Indexed: 11/18/2022] Open
Abstract
Rare earth metal oxides (REMOs) have gained considerable attention in recent years owing to their distinctive properties and potential applications in electronic devices and catalysts. Particularly, cerium dioxide (CeO2), also known as ceria, has emerged as an interesting material in a wide variety of industrial, technological, and medical applications. Ceria can be synthesized with various morphologies, including rods, cubes, wires, tubes, and spheres. This comprehensive review offers valuable perceptions into the crystal structure, fundamental properties, and reaction mechanisms that govern the well-established surface-assisted reactions over ceria. The activity, selectivity, and stability of ceria, either as a stand-alone catalyst or as supports for other metals, are frequently ascribed to its strong interactions with the adsorbates and its facile redox cycle. Doping of ceria with transition metals is a common strategy to modify the characteristics and to fine-tune its reactive properties. DFT-derived chemical mechanisms are surveyed and presented in light of pertinent experimental findings. Finally, the effect of surface termination on catalysis by ceria is also highlighted.
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Affiliation(s)
- Hussein A. Miran
- Department of Physics, College of Education for Pure Science, Ibn Al-Haitham, University of Baghdad, Baghdad 10071, Iraq;
| | - Zainab N. Jaf
- Department of Physics, College of Education for Pure Science, Ibn Al-Haitham, University of Baghdad, Baghdad 10071, Iraq;
| | - Mohammednoor Altarawneh
- Department of Chemical and Petroleum Engineering, United Arab Emirates University, Sheikh Khalifa Bin Zayed Street, Al-Ain 15551, United Arab Emirates
| | - Zhong-Tao Jiang
- Surface Analysis and Materials Engineering Research Group, College of Science, Health, Engineering and Education, Murdoch University, Murdoch, WA 6150, Australia;
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13
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Enhanced Catalytic Soot Oxidation by Ce-Based MOF-Derived Ceria Nano-Bar with Promoted Oxygen Vacancy. Catalysts 2021. [DOI: 10.3390/catal11091128] [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
As CeO2 is a useful catalyst for soot elimination, it is important to develop CeO2 with higher contact areas, and reactivities for efficient soot oxidation and catalytic soot oxidation are basically controlled by structures and surface properties of catalysts. Herein, a Ce-Metal organic framework (MOFs) consisting of Ce and benzene-1,3,5-tricarboxylic acid (H3BTC) is employed as the precursor as CeBTC exhibits a unique bar-like high-aspect-ratio morphology, which is then transformed into CeO2 with a nanoscale bar-like configuration. More importantly, this CeO2 nanobar (CeONB) possesses porou, and even hollow structures, as well as more oxygen vacancies, enabling CeONB to become a promising catalyst for soot oxidation. Thus, CeONB shows a much higher catalytic activity than commercial CeO2 nanoparticle (comCeO) for soot oxidation with a significantly lower ignition temperature (Tig). Moreover, while soot oxidation by comCeO leads to production of CO together with CO2, CeONB can completely convert soot to CO2. The tight contact mode also enables CeONB to exhibit a very low Tig of 310 °C, whereas the existence of NO also enhances the soot oxidation by CeONB to reduce the Tig. The mechanism of NO-assisted soot oxidation is also examined, and validated by DRIFTS to identify the formation and transformation of nitrogen-containing intermediates. CeONB is also recyclable over many consecutive cycles and maintained its high catalytic activity for soot oxidation. These results demonstrate that CeONB is a promising and easily prepared high-aspect-ratio Ce-based catalyst for soot oxidation.
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14
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Yu X, Chen X, Meng W, Zhu M. Research progress on supported solid superbase and its catalytic application. CHEMICAL PAPERS 2021. [DOI: 10.1007/s11696-021-01669-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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15
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Yang L, Hu J, Tian G, Zhu J, Song Q, Wang H, Zhang C. Efficient Catalysts of K and Ce Co-Doped LaMnO 3 for NO x -Soot Simultaneous Removal and Reaction Kinetics. ACS OMEGA 2021; 6:19836-19845. [PMID: 34368570 PMCID: PMC8340398 DOI: 10.1021/acsomega.1c02565] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2021] [Accepted: 07/06/2021] [Indexed: 05/30/2023]
Abstract
Presently, the treatment of four-way catalysts is important for reducing pollutant emissions from diesel engine exhaust, which is a major cause of urban haze. In this study, we prepared perovskite-type catalysts via the citric acid sol-gel method. Experiment results showed that K substitution at site A in LaMnO3 decreased the agglomeration of the catalysts effectively, increased the contact with the reaction gas, promoted the conversion of Mn3+ → Mn4+, and reduced the ignition temperature of soot. Ce substitution at the B-site in La0.5K0.5MnO3 produced a CeO2 phase and decreased the Mn4+/Mn3+ ratio to 0.49, which is conducive to improving the catalytic oxidation performance. The K and Ce co-doping had the best activation effect, which showed a low activation energy (10.87 KJ mol-1) and a high simultaneous removal rate of NO x (reaching 90% at 275 °C) and soot ignition at 250 °C under lean conditions.
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Affiliation(s)
- Li Yang
- State
Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China
| | - Jingnan Hu
- State
Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China
| | - Gang Tian
- State
Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China
| | - Jinwei Zhu
- State
Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China
| | - Qiang Song
- Center
for Durability & Sustainability Studies of Shandong Province, Qingdao University of Technology, Qingdao 266033, China
| | - Hongchang Wang
- State
Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China
| | - Chen Zhang
- State
Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China
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16
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Palladium particles supported on porous CeMnO3 perovskite for catalytic oxidation of benzene. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126687] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Zhao Y, Jalal A, Uzun A. Interplay between Copper Nanoparticle Size and Oxygen Vacancy on Mg-Doped Ceria Controls Partial Hydrogenation Performance and Stability. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01471] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Yuxin Zhao
- Department of Chemical and Biological Engineering, Koç University, Rumelifeneri
Yolu, Sariyer, 34450 Istanbul, Turkey
- Koç University Surface Science and Technology Center (KUYTAM), Koç University, Rumelifeneri Yolu, Sariyer, 34450 Istanbul, Turkey
- Koç University TÜPRAŞ Energy Center (KUTEM), Koç University, Rumelifeneri Yolu, Sariyer, 34450 Istanbul, Turkey
| | - Ahsan Jalal
- Department of Chemical and Biological Engineering, Koç University, Rumelifeneri
Yolu, Sariyer, 34450 Istanbul, Turkey
- Koç University Surface Science and Technology Center (KUYTAM), Koç University, Rumelifeneri Yolu, Sariyer, 34450 Istanbul, Turkey
- Koç University TÜPRAŞ Energy Center (KUTEM), Koç University, Rumelifeneri Yolu, Sariyer, 34450 Istanbul, Turkey
| | - Alper Uzun
- Department of Chemical and Biological Engineering, Koç University, Rumelifeneri
Yolu, Sariyer, 34450 Istanbul, Turkey
- Koç University Surface Science and Technology Center (KUYTAM), Koç University, Rumelifeneri Yolu, Sariyer, 34450 Istanbul, Turkey
- Koç University TÜPRAŞ Energy Center (KUTEM), Koç University, Rumelifeneri Yolu, Sariyer, 34450 Istanbul, Turkey
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18
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Thermally stable surfactant-free ceria nanocubes in silica aerogel. J Colloid Interface Sci 2021; 583:376-384. [PMID: 33011407 DOI: 10.1016/j.jcis.2020.09.044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 09/01/2020] [Accepted: 09/12/2020] [Indexed: 11/23/2022]
Abstract
Surfactant-mediated chemical routes allow one to synthesize highly engineered shape- and size-controlled nanocrystals. However, the occurrence of capping agents on the surface of the nanocrystals is undesirable for selected applications. Here, a novel approach to the production of shape-controlled nanocrystals which exhibit high thermal stability is demonstrated. Ceria nanocubes obtained by surfactant-mediated synthesis are embedded inside a highly porous silica aerogel and thermally treated to remove the capping agent. Powder X-ray Diffraction and Scanning Transmission Electron Microscopy show the homogeneous dispersion of the nanocubes within the aerogel matrix. Remarkably, both the size and the shape of the ceria nanocubes are retained not only throughout the aerogel syntheses but also upon thermal treatments up to 900 °C, while avoiding their agglomeration. The reactivity of ceria is measured by in situ High-Energy Resolution Fluorescence Detected - X-ray Absorption Near Edge Spectroscopy at the Ce L3 edge, and shows the reversibility of redox cycles of ceria nanocubes when they are embedded in the aerogel. This demonstrates that the enhanced reactivity due to their prominent {100} crystal facets is preserved. In contrast, unsupported ceria nanocubes begin to agglomerate as soon as the capping agent decomposes, leading to a degradation of their reactivity already at 275 °C.
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19
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Chlorine-Resistant Hollow Nanosphere-Like VOx/CeO2 Catalysts for Highly Selective and Stable Destruction of 1,2-Dichloroethane: Byproduct Inhibition and Reaction Mechanism. Processes (Basel) 2021. [DOI: 10.3390/pr9010119] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Developing economical and robust catalysts for the highly selective and stable destruction of chlorinated volatile organic compounds (CVOCs) is a great challenge. Here, hollow nanosphere-like VOx/CeO2 catalysts with different V/Ce molar ratios were fabricated and adopted for the destruction of1,2–dichloroethane (1,2–DCE). The V0.05Ce catalyst possessed superior catalytic activity, reaction selectivity, and chlorine resistance owing to a large number of oxygen vacancies, excellent low-temperature redox ability, and chemically adsorbed oxygen (O− and O2−) species mobility. Typical chlorinated byproducts (CHCl3, CCl4, C2HCl3, and C2H3Cl3) derived from the cleavage of C–Cl and C–C bonds of 1,2–DCE were detected, which could be effectively inhibited by the abundant acid sites and the strong interactions of VOx species with CeO2. The presence of water vapor benefited the activation and deep destruction of 1,2–DCE over V0.05Ce owing to the efficient removal of Cl species from the catalyst surface.
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20
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Ceria nanorod supported gold nanoparticles as structured catalysts for the oxidative steam reforming of methanol: Effect of CTAB concentration on physiochemical properties and catalyst performance. J Catal 2020. [DOI: 10.1016/j.jcat.2020.10.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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21
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Teles Aragão Campos P, Vieira Lima JP, de Queiroz Silva DR, Oliveira CF, Dias SCL, Dias JA. Cerium-zirconium mixed oxide nanostructures for diesel soot oxidation: synthesis and effect of structure. RSC Adv 2020; 10:27428-27438. [PMID: 35516927 PMCID: PMC9055676 DOI: 10.1039/d0ra05130f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Accepted: 07/16/2020] [Indexed: 12/16/2022] Open
Abstract
Nanostructured materials have been used in several branches of science and technology. Particulate matter is one of the major air pollution concerns. In this work, nanorods and nanoparticles of Ce0.8Zr0.2O2 (CZ) mixed oxides were prepared by different routes, and the use of an organic template was evaluated in diesel soot oxidation. The catalysts were characterized by several techniques including structural analysis (XRD, TEM, N2 adsorption–desorption) and activity (TPR/MS, TPO/MS). A fast TPR/MS method is proposed to calculate hydrogen consumption that can be correlated to the oxygen storage capacity (OSC). It was demonstrated that CZ-nanorods with twice the amount of template in the syntheses (CZ-NRs-2X) were very active for soot oxidation with T50% at 351 °C, and CO2 and H2O were the only oxidation products from Printex®-U (Evonik). This catalyst, reported for the first time, was subjected to up to three cycles and it showed fair activity, proving that this morphology is one of the best mixed oxides of CZ for oxidation. Nanorods and nanoparticles of Ce0.8Zr0.2O2 (CZ) mixed oxides were prepared by different routes and showed good activity for diesel soot oxidation.![]()
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Affiliation(s)
- Pablo Teles Aragão Campos
- Universidade de Brasília, Campus Universitário Darcy Ribeiro, Instituto de Química, Laboratório de Catálise Asa Norte Brasília-DF 70910-900 Brazil http://www.labcat.unb.br +55-61-3107-3900 +55-61-3107-3846
| | - João Pedro Vieira Lima
- Universidade de Brasília, Campus Universitário Darcy Ribeiro, Instituto de Química, Laboratório de Catálise Asa Norte Brasília-DF 70910-900 Brazil http://www.labcat.unb.br +55-61-3107-3900 +55-61-3107-3846
| | - Daniele Renata de Queiroz Silva
- Universidade de Brasília, Campus Universitário Darcy Ribeiro, Instituto de Química, Laboratório de Catálise Asa Norte Brasília-DF 70910-900 Brazil http://www.labcat.unb.br +55-61-3107-3900 +55-61-3107-3846
| | - Claudinei Fabiano Oliveira
- Universidade de Brasília, Campus Universitário Darcy Ribeiro, Instituto de Química, Laboratório de Catálise Asa Norte Brasília-DF 70910-900 Brazil http://www.labcat.unb.br +55-61-3107-3900 +55-61-3107-3846
| | - Sílvia Cláudia Loureiro Dias
- Universidade de Brasília, Campus Universitário Darcy Ribeiro, Instituto de Química, Laboratório de Catálise Asa Norte Brasília-DF 70910-900 Brazil http://www.labcat.unb.br +55-61-3107-3900 +55-61-3107-3846
| | - José Alves Dias
- Universidade de Brasília, Campus Universitário Darcy Ribeiro, Instituto de Química, Laboratório de Catálise Asa Norte Brasília-DF 70910-900 Brazil http://www.labcat.unb.br +55-61-3107-3900 +55-61-3107-3846
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22
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Influence of Nanoscale Surface Arrangements on the Oxygen Transfer Ability of Ceria–Zirconia Mixed Oxide. INORGANICS 2020. [DOI: 10.3390/inorganics8050034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Ceria-based materials, and particularly CeO2–ZrO2 (CZ) solid solutions are key ingredient in catalyst formulations for several applications due to the ability of ceria to easily cycling its oxidation state between Ce4+ and Ce3+. Ceria-based catalysts have a great soot oxidation potential and the mechanism deeply relies on the degree of contact between CeO2 and carbon. In this study, carbon soot has been used as solid reductant to better understand the oxygen transfer ability of ceria–zirconia at low temperatures; the effect of different atmosphere and contact conditions has been investigated. The difference in the contact morphology between carbon soot and CZ particles is shown to strongly affect the oxygen transfer ability of ceria; in particular, increasing the carbon–ceria interfacial area, the reactivity of CZ lattice oxygen is significantly improved. In addition, with a higher degree of contact, the soot oxidation is less affected by the presence of NOx. The NO oxidation over CZ in the presence of soot has also been analyzed. The existence of a core/shell structure strongly enhances reactivity of interfacial oxygen species while affecting negatively NO oxidation characteristics. These findings are significant in the understanding of the redox chemistry of substituted ceria and help determining the role of active species in soot oxidation reaction as a function of the degree of contact between ceria and carbon.
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23
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Medina JC, Rodil SE, Zanella R. Synthesis of a CeO2/Co3O4 catalyst with a remarkable performance for the soot oxidation reaction. Catal Sci Technol 2020. [DOI: 10.1039/c9cy01821b] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A highly active catalyst based on CeO2/Co3O4 for soot oxidation at low temperatures with complete selectivity toward CO2.
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Affiliation(s)
- J. C. Medina
- Instituto de Ciencias Aplicadas y Tecnología
- Universidad Nacional Autónoma de México
- C.P. 04510 Mexico City
- Mexico
| | - S. E. Rodil
- Instituto de Investigaciones en Materiales
- Universidad Nacional Autónoma de México
- Mexico City
- Mexico
| | - Rodolfo Zanella
- Instituto de Ciencias Aplicadas y Tecnología
- Universidad Nacional Autónoma de México
- C.P. 04510 Mexico City
- Mexico
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24
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Bendieb Aberkane A, Yeste MP, Fayçal D, Goma D, Cauqui MÁ. Catalytic Soot Oxidation Activity of NiO-CeO 2 Catalysts Prepared by a Coprecipitation Method: Influence of the Preparation pH on the Catalytic Performance. MATERIALS (BASEL, SWITZERLAND) 2019; 12:E3436. [PMID: 31640143 PMCID: PMC6829405 DOI: 10.3390/ma12203436] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 10/14/2019] [Accepted: 10/16/2019] [Indexed: 12/21/2022]
Abstract
A series of NiO-CeO2 mixed oxide catalysts have been synthesized by a modified coprecipitation method at three different pH values (pH = 8, 9, and 10). The NiO-CeO2 mixed oxide samples were characterized by TGA, XRD, inductively coupled plasma atomic emission spectroscopy (ICP-AES), FTIR, Brunauer-Emmett-Teller (BET) surface area, H2 temperature-programmed reduction (H2-TPR), and electron microscopy (high-angle annular dark-field transmission electron microscopy/energy-dispersive X-ray spectroscopy (HAADF-TEM/EDS)). The catalytic activities of the samples for soot oxidation were investigated under loose and tight contact conditions. The catalysts exhibited a high BET surface area with average crystal sizes that varied with the pH values. Electron microscopy results showed the formation of small crystallites (~5 nm) of CeO2 supported on large plate-shaped particles of NiO (~20 nm thick). XRD showed that a proportion of the Ni2+ was incorporated into the ceria network, and it appeared that the amount on Ni2+ that replaced Ce4+ was higher when the synthesis of the mixed oxides was carried out at a lower pH. Among the synthesized catalysts, Ni-Ce-8 (pH = 8) exhibited the best catalytic performance.
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Affiliation(s)
- Amar Bendieb Aberkane
- Laboratoire de recherche sur la physico-chimie des surfaces et interfaces (LRPCSI), Département de Pétrochimie & Génie des Procédés, Faculté de Technologie, Université 20 Août 1955-Skikda, BP 26, Route d'El Hadaiek-Skikda 21000, Algerie.
| | - María Pilar Yeste
- Department of Material Science, Metallurgical Engineering and Inorganic Chemistry, Faculty of Sciences, University of Cadiz, E-11510, Puerto Real, 11003 Cadiz, Spain.
| | - Djazi Fayçal
- Laboratoire de recherche sur la physico-chimie des surfaces et interfaces (LRPCSI), Département de Pétrochimie & Génie des Procédés, Faculté de Technologie, Université 20 Août 1955-Skikda, BP 26, Route d'El Hadaiek-Skikda 21000, Algerie.
| | - Daniel Goma
- Department of Material Science, Metallurgical Engineering and Inorganic Chemistry, Faculty of Sciences, University of Cadiz, E-11510, Puerto Real, 11003 Cadiz, Spain.
| | - Miguel Ángel Cauqui
- Department of Material Science, Metallurgical Engineering and Inorganic Chemistry, Faculty of Sciences, University of Cadiz, E-11510, Puerto Real, 11003 Cadiz, Spain.
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25
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Dual functions of CoO decoration in PtCo/CeO2 catalysts for the hydrogen-borrowing amination of alcohols to primary amines. J Catal 2019. [DOI: 10.1016/j.jcat.2019.08.024] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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26
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Amjad UES, Quintero CWM, Ercolino G, Italiano C, Vita A, Specchia S. Methane Steam Reforming on the Pt/CeO2 Catalyst: Effect of Daily Start-Up and Shut-Down on Long-Term Stability of the Catalyst. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b02436] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Um-e-Salma Amjad
- Department of Chemical Engineering, COMSATS University Islamabad Lahore Campus, Defence Road, Off Raiwind Road, 54000 Lahore, Pakistan
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
| | - Carmen W. Moncada Quintero
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
| | - Giuliana Ercolino
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
| | - Cristina Italiano
- CNR-ITAE “Nicola Giordano”, Via Salita S. Lucia sopra Contesse 5, 98126 Messina, Italy
| | - Antonio Vita
- CNR-ITAE “Nicola Giordano”, Via Salita S. Lucia sopra Contesse 5, 98126 Messina, Italy
| | - Stefania Specchia
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
- CNR-ITAE “Nicola Giordano”, Via Salita S. Lucia sopra Contesse 5, 98126 Messina, Italy
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27
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Eaimsumang S, Petchakan S, Luengnaruemitchai A. Dependence of the CeO2 morphology in CuO/CeO2 catalysts for the oxidative steam reforming of methanol. REACTION KINETICS MECHANISMS AND CATALYSIS 2019. [DOI: 10.1007/s11144-019-01570-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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28
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Real-Time Observation of Carbon Oxidation by Driven Motion of Catalytic Ceria Nanoparticles within Low Pressure Oxygen. Sci Rep 2019; 9:8082. [PMID: 31147572 PMCID: PMC6542848 DOI: 10.1038/s41598-019-44531-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Accepted: 05/13/2019] [Indexed: 11/18/2022] Open
Abstract
Carbon particulate matter (PM) is an undesirable aerosol pollutant formed from combustors such as power plants, refineries, and engines. The most common and effective method of mitigating PM emission is the capture of particulates using a filter, before particles are released into the atmosphere. In order to develop and improve advanced filtering materials, a better understanding is required of their chemical and mechanical behavior. We report on a novel phenomenon on the mobility and oxidation behavior of catalytic iron doped ceria nanoparticles in contact with mobile carbon black nanoparticles. The process is recorded by real time imaging within an environmental transmission electron microscope. In contrast to observations in previous studies, the separated ceria nanoparticles are found to actively move on the substrate and consume the connecting carbon particles one-by-one. The velocity of particle motion is correlated to the reaction temperature and oxygen pressure, both determining the reaction rate. Modeling using the Density Functional Theory suggests this motion is driven by the chemical bonding between the surface oxygen of the catalyst and the graphite layers of carbon black, initiated through the Van der Waals force between two types of nanoparticles.
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29
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Yao S, Zhang H, Chen Z, Lin H, Han S, Wu X, Dong R, Wu Z, Nozaki T. Promotion of graphitic carbon oxidation via stimulating CO 2 desorption by calcium carbonate. JOURNAL OF HAZARDOUS MATERIALS 2019; 363:10-15. [PMID: 30300773 DOI: 10.1016/j.jhazmat.2018.09.048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Revised: 08/19/2018] [Accepted: 09/19/2018] [Indexed: 06/08/2023]
Abstract
Carbon oxidation has two stages, the first is the formation of surface oxides and the second is the gasification of the surface oxides to CO2. Calcium carbonate (CaCO3) was used to catalyze the gasification of the surface oxides. The catalytic effect of on graphite oxidation and its catalytic mechanism were studied by using thermogravimetric technique and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). It was found that characteristic temperature (T50) of graphite oxidation with CaCO3 was 946 K, 113 K lower than that of graphite only. DRIFTS analysis results show that surface oxides (adsorbed CO2 and carbonate CO32-) were formed on the graphite surface at a temperature above 473 K, carbonate products on graphite surface disappeared when CaCO3 was present; formation of CO32- on CaCO3 surface was confirmed, this CO32- may be more easily gasified into gaseous CO2. The kinetic analysis results showed that CaCO3 promoted graphite oxidation has an activation energy of 74.3 kJ mol-1, far lower than that of graphite (148 kJ mol-1).
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Affiliation(s)
- Shuiliang Yao
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Zhejiang 310018, China
| | - Huanhuan Zhang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Zhejiang 310018, China
| | - Zhizong Chen
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Zhejiang 310018, China
| | - Hanghao Lin
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Zhejiang 310018, China
| | - Shoushan Han
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Zhejiang 310018, China
| | - Xinyue Wu
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Zhejiang 310018, China
| | - Ruoyu Dong
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Zhejiang 310018, China
| | - Zuliang Wu
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Zhejiang 310018, China.
| | - Tomohiro Nozaki
- Department of Mechanical Engineering, School of Engineering, Tokyo Institute of Technology, O-okayama, Tokyo, 152-8550, Japan
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30
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Abstract
Copper-cerium mixed oxide catalysts have gained ground over the years in the field of heterogeneous catalysis and especially in CO oxidation reaction due to their remarkable performance. In this study, a series of highly active, atomically dispersed copper-ceria nanocatalysts were synthesized via appropriate tuning of a novel hydrothermal method. Various physicochemical techniques including electron paramagnetic resonance (EPR) spectroscopy, X-ray diffraction (XRD), N2 adsorption, scanning electron microscopy (SEM), Raman spectroscopy, and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS) were employed in the characterization of the synthesized materials, while all the catalysts were evaluated in the CO oxidation reaction. Moreover, discussion of the employed mechanism during hydrothermal route was provided. The observed catalytic activity in CO oxidation reaction was strongly dependent on the nanostructured morphology, oxygen vacancy concentration, and nature of atomically dispersed Cu2+ clusters.
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31
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Zhao P, Fang F, Feng N, Chen C, Liu G, Chen L, Zhu Z, Meng J, Wan H, Guan G. Self-templating construction of mesopores on three-dimensionally ordered macroporous La0.5Sr0.5MnO3 perovskite with enhanced performance for soot combustion. Catal Sci Technol 2019. [DOI: 10.1039/c9cy00096h] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A three-dimensionally ordered macroporous (3DOM) La0.5Sr0.5MnO3 perovskite was prepared by a colloidal crystal templating method, with extra mesopores created by selective dissolution method performed successively.
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32
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Abstract
Nowadays catalytic technologies are widely used to purify indoor and outdoor air from harmful compounds. Recently, Ag–CeO2 composites have found various applications in catalysis due to distinctive physical-chemical properties and relatively low costs as compared to those based on other noble metals. Currently, metal–support interaction is considered the key factor that determines high catalytic performance of silver–ceria composites. Despite thorough investigations, several questions remain debating. Among such issues, there are (1) morphology and size effects of both Ag and CeO2 particles, including their defective structure, (2) chemical and charge state of silver, (3) charge transfer between silver and ceria, (4) role of oxygen vacancies, (5) reducibility of support and the catalyst on the basis thereof. In this review, we consider recent advances and trends on the role of silver–ceria interactions in catalytic performance of Ag/CeO2 composites in low-temperature CO oxidation, soot oxidation, and volatile organic compounds (VOCs) abatement. Promising photo- and electrocatalytic applications of Ag/CeO2 composites are also discussed.
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33
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Mukherjee D, Devaiah D, Venkataswamy P, Vinodkumar T, Smirniotis PG, Reddy BM. Superior catalytic performance of a CoOx/Sn–CeO2 hybrid material for catalytic diesel soot oxidation. NEW J CHEM 2018. [DOI: 10.1039/c8nj01184b] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A Co3O4/Sn–CeO2 hybrid catalyst exhibited superior soot oxidation activity due to the existence of synergism among the multivalent cations and the stepped surface of the hybrid catalyst.
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Affiliation(s)
- Deboshree Mukherjee
- Inorganic and Physical Chemistry Division
- CSIR – Indian Institute of Chemical Technology
- Uppal Road
- Hyderabad 500 007
- India
| | - Damma Devaiah
- Chemical Engineering
- College of Engineering and Applied Science
- University of Cincinnati
- Cincinnati
- USA
| | | | - T. Vinodkumar
- Department of Chemistry
- Indian Institute of Technology
- Hyderabad 502 285
- India
| | - Panagiotis G. Smirniotis
- Chemical Engineering
- College of Engineering and Applied Science
- University of Cincinnati
- Cincinnati
- USA
| | - Benjaram M. Reddy
- Inorganic and Physical Chemistry Division
- CSIR – Indian Institute of Chemical Technology
- Uppal Road
- Hyderabad 500 007
- India
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34
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Zhao P, Feng N, Fang F, Liu G, Chen L, Meng J, Chen C, Wang L, Wan H, Guan G. Facile synthesis of three-dimensional ordered macroporous Sr1−xKxTiO3 perovskites with enhanced catalytic activity for soot combustion. Catal Sci Technol 2018. [DOI: 10.1039/c8cy01498a] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The appropriate incorporation of potassium into 3DOM SrTiO3 perovskites effectively improved the catalytic performance for soot combustion.
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35
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Jampaiah D, Velisoju VK, Venkataswamy P, Coyle VE, Nafady A, Reddy BM, Bhargava SK. Nanowire Morphology of Mono- and Bidoped α-MnO 2 Catalysts for Remarkable Enhancement in Soot Oxidation. ACS APPLIED MATERIALS & INTERFACES 2017; 9:32652-32666. [PMID: 28862428 DOI: 10.1021/acsami.7b07656] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In the present work, nanowire morphologies of α-MnO2, cobalt monodoped α-MnO2, Cu and Co bidoped α-MnO2, and Ni and Co bidoped α-MnO2 samples were prepared by a facile hydrothermal synthesis. The structural, morphological, surface, and redox properties of all the as-prepared samples were investigated by various characterization techniques, namely, scanning electron microscopy (SEM), transmission and high resolution electron microscopy (TEM and HR-TEM), powder X-ray diffraction (XRD), N2 sorption surface area measurements, X-ray photoelectron spectroscopy (XPS), hydrogen-temperature-programmed reduction (H2-TPR), and oxygen-temperature-programmed desorption (O2-TPD). The soot oxidation performance was found to be significantly improved via metal mono- and bidoping. In particular, Cu and Co bidoped α-MnO2 nanowires showed a remarkable improvement in soot oxidation performance, with its T50 (50% soot conversion) values of 279 and 431 °C under tight and loose contact conditions, respectively. The soot combustion activation energy for the Cu and Co bidoped MnO2 nanowires is 121 kJ/mol. The increased oxygen vacancies, greater number of active sites, facile redox behavior, and strong synergistic interaction were the key factors for the excellent catalytic activity. The longevity of Cu and Co bidoped α-MnO2 nanowires was analyzed, and it was found that the Cu/Co bidoped α-MnO2 nanowires were highly stable after five successive cycles and showed an insignificant decrease in soot oxidation activity. Furthermore, the HR-TEM analysis of a spent catalyst after five cycles indicated that the (310) crystal plane of α-MnO2 interacts with the soot particles; therefore, we can assume that more-reactive exposed surfaces positively affect the reaction of soot oxidation. Thus, the Cu and Co bidoped α-MnO2 nanowires provide promise as a highly effective alternative to precious metal based automotive catalysts.
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Affiliation(s)
- Deshetti Jampaiah
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of Science, RMIT University , GPO BOX 2476, Melbourne, Victoria 3001, Australia
| | - Vijay Kumar Velisoju
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of Science, RMIT University , GPO BOX 2476, Melbourne, Victoria 3001, Australia
- Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology , Uppal Road, Hyderabad 500 007, India
| | | | - Victoria E Coyle
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of Science, RMIT University , GPO BOX 2476, Melbourne, Victoria 3001, Australia
| | - Ayman Nafady
- Department of Chemistry, College of Science, King Saud University , Riyadh 11451, Saudi Arabia
| | - Benjaram M Reddy
- Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology , Uppal Road, Hyderabad 500 007, India
| | - Suresh K Bhargava
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of Science, RMIT University , GPO BOX 2476, Melbourne, Victoria 3001, Australia
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36
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Affiliation(s)
- Alessandro Trovarelli
- Dipartimento
Politecnico, Università di Udine, via del Cotonificio 108, 33100 Udine, Italy
| | - Jordi Llorca
- Institute
of Energy Technologies, Department of Chemical Engineering and Barcelona
Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, EEBE, Eduard Maristany 10-14, 08019 Barcelona, Spain
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37
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Nadaroglu H, Onem H, Alayli Gungor A. Green synthesis of Ce 2O 3 NPs and determination of its antioxidant activity. IET Nanobiotechnol 2017; 11:411-419. [PMID: 28530190 PMCID: PMC8676482 DOI: 10.1049/iet-nbt.2016.0138] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 09/09/2016] [Accepted: 09/23/2016] [Indexed: 11/09/2023] Open
Abstract
In this study, the authors presented synthesis of ceria nanoparticles (NPs) by the bio-reduction method and their antioxidative activity. Aqueous extract of Euphorbia (Euphorbia amygdaloides) was used as reducing and stabilising agents. They used aqueous extract of Euphorbia (E. amygdaloides) as reducing and stabilising agent. Ultraviolet-visible (UV-vis) absorption spectroscopy was used to monitor the quantitative formation of ceria NPs. They also addressed the characteristics of the obtained ceria NPs using scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmitting electron microscope (TEM). The synthesised cerium (III) oxide (Ce2O3) NPs were initially noted through visual colour change from colourless pale yellow cerium (III) to light yellow cerium (IV) and further confirmed the band at 345 nm employing UV-vis spectroscopy. The average diameter of the prepared NPs was about 8.6-10.5 nm. In addition, the synthesised Ce2O3 NPs were tested for antioxidant and anti-bacterial activities using ferric reducing antioxidant power, cupric reducing antioxidant capacity, ferrous ions chelating activity, superoxide the anion radical scavenging and 2, 2'-azinobis 3-ethylbenzothiazol to-6-sulphonic acid scavenging activity. It could be concluded that Euphorbia (E. amygdaloides) extract can be used efficiently in the production of potential antioxidant and anti-bacterial Ce2O3 NPs for commercial applications.
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Affiliation(s)
- Hayrunnisa Nadaroglu
- Department of Nano-Science and Nano-Engineering, Faculty of Engineering, Ataturk University, 25240 Erzurum, Turkey.
| | - Hicran Onem
- Department of Food Technology, Erzurum Vocational Training School, Ataturk University, 25240 Erzurum, Turkey
| | - Azize Alayli Gungor
- Department of Chemical Technology, Erzurum Vocational Training School, Ataturk University, 25240 Erzurum, Turkey
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