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Grabchenko MV, Mikheeva NN, Mamontov GV, Cortés Corberán V, Litvintseva KA, Svetlichnyi VA, Vodyankina OV, Salaev MA. Unraveling the Structural and Compositional Peculiarities in CTAB-Templated CeO 2-ZrO 2-MnO x Catalysts for Soot and CO Oxidation. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:3108. [PMID: 38133005 PMCID: PMC10745992 DOI: 10.3390/nano13243108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 12/02/2023] [Accepted: 12/05/2023] [Indexed: 12/23/2023]
Abstract
Structure-performance relationships in functional catalysts allow for controlling their performance in a wide range of reaction conditions. Here, the structural and compositional peculiarities in CTAB-templated CeO2-ZrO2-MnOx catalysts prepared by co-precipitation of precursors and their catalytic behavior in CO oxidation and soot combustion are discussed. A complex of physical-chemical methods (low-temperature N2 sorption, XRD, TPR-H2, Raman, HR TEM, XPS) is used to elucidate the features of the formation of interphase boundaries, joint phases, and defects in multicomponent oxide systems. The addition of Mn and/or Zr dopant to ceria is shown to improve its performance in both reactions. Binary Ce-Mn catalysts demonstrate enhanced performance closely followed by the ternary oxide catalysts, which is due the formation of several types of active sites, namely, highly dispersed MnOx species, oxide-oxide interfaces, and oxygen vacancies that can act individually and/or synergistically.
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Affiliation(s)
- Maria V. Grabchenko
- Laboratory of Catalytic Research, Tomsk State University, 634050 Tomsk, Russia;
| | - Natalia N. Mikheeva
- Research Laboratory of Porous Materials and Sorption, Tomsk State University, 634050 Tomsk, Russia (O.V.V.)
| | - Grigory V. Mamontov
- Research Laboratory of Porous Materials and Sorption, Tomsk State University, 634050 Tomsk, Russia (O.V.V.)
| | - Vicente Cortés Corberán
- Instituto de Catálisis y Petroleoquímica (ICP), Consejo Superior de Investigaciones Científicas (CSIC), 28049 Madrid, Spain;
| | - Kseniya A. Litvintseva
- Boreskov Institute of Catalysis SB RAS (BIC SB RAS), 630090 Novosibirsk, Russia
- Department of Physics, Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Valery A. Svetlichnyi
- Laboratory of Advanced Materials and Technology, Siberian Physical Technical Institute, Tomsk State University, 634050 Tomsk, Russia
| | - Olga V. Vodyankina
- Research Laboratory of Porous Materials and Sorption, Tomsk State University, 634050 Tomsk, Russia (O.V.V.)
| | - Mikhail A. Salaev
- Laboratory of Catalytic Research, Tomsk State University, 634050 Tomsk, Russia;
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2
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Zuhra Z, Li S, Xie G, Wang X. Soot Erased: Catalysts and Their Mechanistic Chemistry. Molecules 2023; 28:6884. [PMID: 37836727 PMCID: PMC10574243 DOI: 10.3390/molecules28196884] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 09/25/2023] [Accepted: 09/26/2023] [Indexed: 10/15/2023] Open
Abstract
Soot formation is an inevitable consequence of the combustion of carbonaceous fuels in environments rich in reducing agents. Efficient management of pollution in various contexts, such as industrial fires, vehicle engines, and similar applications, relies heavily on the subsequent oxidation of soot particles. Among the oxidizing agents employed for this purpose, oxygen, carbon dioxide, water vapor, and nitrogen dioxide have all demonstrated effectiveness. The scientific framework of this research can be elucidated through the following key aspects: (i) This review situates itself within the broader context of pollution management, emphasizing the importance of effective soot oxidation in reducing emissions and mitigating environmental impacts. (ii) The central research question of this study pertains to the identification and evaluation of catalysts for soot oxidation, with a specific emphasis on ceria-based catalysts. The formulation of this research question arises from the need to enhance our understanding of catalytic mechanisms and their application in environmental remediation. This question serves as the guiding principle that directs the research methodology. (iii) This review seeks to investigate the catalytic mechanisms involved in soot oxidation. (iv) This review highlights the efficacy of ceria-based catalysts as well as other types of catalysts in soot oxidation and elucidate the underlying mechanistic strategies. The significance of these findings is discussed in the context of pollution management and environmental sustainability. This study contributes to the advancement of knowledge in the field of catalysis and provides valuable insights for the development of effective strategies to combat air pollution, ultimately promoting a cleaner and healthier environment.
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Affiliation(s)
- Zareen Zuhra
- Department of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China; (Z.Z.); (S.L.); (X.W.)
- School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China
| | - Shuo Li
- Department of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China; (Z.Z.); (S.L.); (X.W.)
| | - Guanqun Xie
- Department of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China; (Z.Z.); (S.L.); (X.W.)
| | - Xiaoxia Wang
- Department of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China; (Z.Z.); (S.L.); (X.W.)
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Srinivasappa PM, Prasad D, Chaudhari NK, Samal AK, Thapa R, Siddharthan EE, Jadhav AH. Trimetallic Oxide Foam as an Efficient Catalyst for Fixation of CO 2 into Oxazolidinone: An Experimental and Theoretical Approach. ACS APPLIED MATERIALS & INTERFACES 2023; 15:21994-22011. [PMID: 37114882 DOI: 10.1021/acsami.2c23019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The excess anthropogenic CO2 depletion via the catalytic approach to produce valuable chemicals is an industrially challenging, demanding, and encouraging strategy for CO2 fixation. Herein, we demonstrate a selective one-pot strategy for CO2 fixation into "oxazolidinone" by employing stable porous trimetallic oxide foam (PTOF) as a new catalyst. The PTOF catalyst was synthesized by a solution combustion method using transition metals Cu, Co, and Ni and systematically characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HR-TEM), N2 sorption, temperature-programmed desorption (TPD), and X-ray photoelectron spectroscopy (XPS) analysis. Due to the distinctive synthesis method and unique combination of metal oxides and their percentage, the PTOF catalyst displayed highly interconnected porous channels along with uniformly distributed active sites on its surface. Well ahead, the PTOF catalyst was screened for the fixation of CO2 into oxazolidinone. The screened and optimized reaction parameters revealed that the PTOF catalyst showed highly efficient and selective activity with 100% conversion of aniline along with 96% selectivity and yield toward the oxazolidinone product at mild and solvent-free reaction conditions. The superiority of the catalytic performance could be due to the presence of surface active sites and acid-base cooperative synergistic properties of the mixed metal oxides. A doubly synergistic plausible reaction mechanism was proposed for the oxazolidinone synthesis experimentally with the support of DFT calculations along with bond lengths, bond angles, and binding energies. In addition, stepwise intermediate formations with the free energy profile were also proposed. Also, the PTOF catalyst displayed good tolerance toward substituted aromatic amines and terminal epoxides for the fixation of CO2 into oxazolidinones. Very interestingly, the PTOF catalyst could be significantly reused for up to 15 consecutive cycles with stable activity and retention in physicochemical properties.
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Affiliation(s)
- Puneethkumar M Srinivasappa
- Centre for Nano and Material Science, JAIN University, Jain Global Campus, Bangalore 562112, Karnataka, India
| | - Divya Prasad
- Centre for Nano and Material Science, JAIN University, Jain Global Campus, Bangalore 562112, Karnataka, India
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, United States
| | - Nitin K Chaudhari
- Department of Chemistry, School of Technology, Pandit Deendayal Petroleum University, Gandhinagar 382007, Gujarat, India
| | - Akshaya K Samal
- Centre for Nano and Material Science, JAIN University, Jain Global Campus, Bangalore 562112, Karnataka, India
| | - Ranjit Thapa
- Department of Physics, SRM University─AP, Amaravati 522240, Andhra Pradesh, India
| | | | - Arvind H Jadhav
- Centre for Nano and Material Science, JAIN University, Jain Global Campus, Bangalore 562112, Karnataka, India
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4
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Phan NHT, Nguyen CC, Nguyen Dinh MT. A glucose-assisted redox hydrothermal route to prepare a Mn-doped CeO 2 catalyst for the total catalytic oxidation of VOCs. RSC Adv 2023; 13:13354-13364. [PMID: 37143917 PMCID: PMC10152232 DOI: 10.1039/d3ra00957b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2023] [Accepted: 04/17/2023] [Indexed: 05/06/2023] Open
Abstract
In this study, a novel glucose-assisted redox hydrothermal method has been presented to prepare an Mn-doped CeO2 catalyst (denoted as Mn-CeO2-R) for the first time. The obtained catalyst contains uniform nanoparticles with a small crystallite size, a large mesopore volume, and rich active surface oxygen species. Such features collectively contribute to improving the catalytic activity for the total catalytic oxidation of methanol (CH3OH) and formaldehyde (HCHO). Interestingly, the large mesopore volume feature of the Mn-CeO2-R samples could be considered an essential factor to eliminate the diffusion limit, favoring the total oxidation of toluene (C7H8) at high conversion. Therefore, the Mn-CeO2-R catalyst outperforms both bare CeO2 and conventional Mn-CeO2 catalysts with T 90 values of 150 °C and 178 °C for HCHO and CH3OH, respectively, and 315 °C for C7H8, at a high GHSV of 60 000 mL g-1 h-1. Such robust catalytic activities signify a potential utilization of Mn-CeO2-R for the catalytic oxidation of volatile organic compounds (VOCs).
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Affiliation(s)
- Nga Hang Thi Phan
- The University of Danang, School of Medicine and Pharmacy Danang 550000 Vietnam
| | - Chinh Chien Nguyen
- Institute of Research and Development, Duy Tan University Danang City 550000 Vietnam
- Faculty of Environmental and Chemical Engineering, Duy Tan University Da Nang 550000 Vietnam
| | - Minh Tuan Nguyen Dinh
- The University of Danang, University of Science and Technology 54, Nguyen Luong Bang Danang City Vietnam
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Zhang X, Xu Z, Jiang M, Chen S, Han Z, Liu Y, Liu Y. Enhanced activity of CuOy/TNTs doped by CeOx for catalytic ozonation of 1,2-dichloroethane at normal temperatures: performance and catalytic mechanism. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2023.123255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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6
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Zhu M, Wen Y, Shi L, Tan Z, Shen Y, Yin K, Sun L. Revealing the promoting effect of multiple Mn valences on the catalytic activity of CeO 2 nanorods toward soot oxidation. NANOSCALE 2022; 14:11963-11971. [PMID: 35894864 DOI: 10.1039/d2nr03101a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Mn-modified CeO2 nanomaterials have attracted extensive attention as efficient and promising catalysts for soot combustion due to their low cost and high catalytic activity. However, a detailed mechanism of how Mn promotes soot oxidation over CeO2 is still not clearly elucidated, which is crucial to further optimize the catalyst for achieving its practical applications. We here report a Mn-doped CeO2 catalyst with tunable surface Mn chemical valence states to study the Mn-promoting mechanism for improving CeO2 catalyst activity in soot oxidation. Experimental results show that Mn-doped CeO2 nanorods with surface Mn chemical valence states being optimized (Mn0.19Ce0.81O2) can lower the eliminating temperature of soot to 410 °C (T90) when in a loose contact and exhibit a strong resistance towards water molecules. The catalytic performances of Mn0.19Ce0.81O2 nanorods are comparable with those of other reported oxide catalysts both in the mimetic realistic and ideal reaction environments. Detailed characterization and theoretical calculation results demonstrate that balanced multiple Mn valences can dramatically enhance the catalysts' redox properties and their ability to activate O2 molecules, as well as improve the dynamic contact efficiency during the oxidation, which synergistically result in superior catalytic performances. This work might provide insight for the future design and preparation of catalysts to efficiently eliminate soot particles.
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Affiliation(s)
- Mingyun Zhu
- SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, Southeast University, Nanjing, 210096, China.
| | - Yifeng Wen
- SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, Southeast University, Nanjing, 210096, China.
| | - Lei Shi
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China
| | - Zhiyuan Tan
- SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, Southeast University, Nanjing, 210096, China.
| | - Yuting Shen
- School of Electronic and Information Engineering, Changshu Institute of Technology, Changshu, 215500, China
| | - Kuibo Yin
- SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, Southeast University, Nanjing, 210096, China.
| | - Litao Sun
- SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, Southeast University, Nanjing, 210096, China.
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7
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Liu W, Cao H, Wang Z, Cui C, Gan L, Liu W, Wang L. A novel ceria hollow nanosphere catalyst for low temperature NO storage. J RARE EARTH 2022. [DOI: 10.1016/j.jre.2021.02.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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8
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Aragão Campos PT, Oliveira CF, Vieira Lima JP, Renata de Queiroz Silva D, Loureiro Dias SC, Dias JA. Cerium–zirconium mixed oxide synthesized by sol-gel method and its effect on the oxygen vacancy and specific surface area. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2021.122752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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9
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Zhang F, Zhu X, Wu H, Wu X, Zhou Z, Chen G, Yang G. Activity and Stability of Cu‐Based Spinel‐Type Complex Oxides for Diesel Soot Combustion. ChemistrySelect 2021. [DOI: 10.1002/slct.202102899] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Fei Zhang
- Faculty of Maritime and Transportation Ningbo University 169# Qixing South Road, Beilun District Ningbo Zhejiang Province 315211 China
| | - Xinbo Zhu
- Faculty of Maritime and Transportation Ningbo University 169# Qixing South Road, Beilun District Ningbo Zhejiang Province 315211 China
| | - Hanpeng Wu
- Faculty of Maritime and Transportation Ningbo University 169# Qixing South Road, Beilun District Ningbo Zhejiang Province 315211 China
| | - Xiqiang Wu
- Faculty of Maritime and Transportation Ningbo University 169# Qixing South Road, Beilun District Ningbo Zhejiang Province 315211 China
| | - Zijian Zhou
- State Key Laboratory of Coal Combustion School of Energy and Power Engineering Huazhong University of Science and Technology 1037# Luoyu Road, Hongshan District Wuhan Hubei province 430074 China
| | - Geng Chen
- Faculty of Maritime and Transportation Ningbo University 169# Qixing South Road, Beilun District Ningbo Zhejiang Province 315211 China
| | - Guohua Yang
- Faculty of Maritime and Transportation Ningbo University 169# Qixing South Road, Beilun District Ningbo Zhejiang Province 315211 China
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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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11
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Effect of surface manganese oxide species on soot catalytic combustion of Ce–Mn–O catalyst. J RARE EARTH 2021. [DOI: 10.1016/j.jre.2021.08.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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12
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The catalytic activity of Ce-Hf, Ce-Hf-Mg mixed oxides and RuO2/HfO2 deposited on CeO2: Role of superoxide/peroxide in soot oxidation reaction. KOREAN J CHEM ENG 2021. [DOI: 10.1007/s11814-021-0805-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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13
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Sorolla‐Rosario D, Davó‐Quiñonero A, Bailón‐García E, Lozano‐Castelló D, Bueno‐López A. Key‐lock Ceria Catalysts for the Control of Diesel Engine Soot Particulate Emissions. ChemCatChem 2020. [DOI: 10.1002/cctc.201902177] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Débora Sorolla‐Rosario
- Department of Inorganic ChemistryUniversity of Alicante Carretera de San Vicente s/n Alicante E03080 Spain
| | - Arantxa Davó‐Quiñonero
- Department of Inorganic ChemistryUniversity of Alicante Carretera de San Vicente s/n Alicante E03080 Spain
| | - Esther Bailón‐García
- Department of Inorganic ChemistryUniversity of Alicante Carretera de San Vicente s/n Alicante E03080 Spain
| | - Dolores Lozano‐Castelló
- Department of Inorganic ChemistryUniversity of Alicante Carretera de San Vicente s/n Alicante E03080 Spain
| | - Agustín Bueno‐López
- Department of Inorganic ChemistryUniversity of Alicante Carretera de San Vicente s/n Alicante E03080 Spain
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14
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Muthuvel A, Jothibas M, Manoharan C, Jayakumar SJ. Synthesis of CeO2-NPs by chemical and biological methods and their photocatalytic, antibacterial and in vitro antioxidant activity. RESEARCH ON CHEMICAL INTERMEDIATES 2020. [DOI: 10.1007/s11164-020-04115-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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15
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Sellers-Antón B, Bailón-García E, Cardenas-Arenas A, Davó-Quiñonero A, Lozano-Castelló D, Bueno-López A. Enhancement of the Generation and Transfer of Active Oxygen in Ni/CeO 2 Catalysts for Soot Combustion by Controlling the Ni-Ceria Contact and the Three-Dimensional Structure. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:2439-2447. [PMID: 31944674 DOI: 10.1021/acs.est.9b07682] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The effect of the three-dimensionally ordered macroporous (3DOM) structure and the Ni doping of CeO2 on the physicochemical properties and catalytic activity for soot combustion was studied. Moreover, the way in which Ni is introduced to the ceria support was also investigated. For this, CeO2 supports were synthesized with uncontrolled (Ref) and 3DOM-structured morphology, and their respective Ni/CeO2 catalysts were prepared by impregnation of the previously synthesized supports or by successive impregnation of both precursors (Ni and Ce) on the 3DOM template. Conclusions reached in this study are: (1) the 3DOM structure increases the surface area of the catalysts and improves the catalyst-soot contact. (2) The doping of CeO2 with Ni improves the catalytic activity because the NiO participates in the catalytic oxidation of NO to NO2, and also favors the production of active oxygen and the catalyst oxygen storage capacity. (3) Ni incorporation method affects its physicochemical and catalytic properties. By introducing Ni by successive infiltration in the solid template, the CeO2 crystal size is reduced, Ni dispersion is improved, and the catalyst reducibility is increased. All of these characteristics make the catalyst synthesized by successive infiltration to have higher catalytic activity for soot combustion than the Ni-impregnated CeO2 catalyst.
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Affiliation(s)
- Begoña Sellers-Antón
- Department of Inorganic Chemistry , University of Alicante , Carretera de San Vicente s/n , E03080 Alicante , Spain
| | - Esther Bailón-García
- Department of Inorganic Chemistry , University of Alicante , Carretera de San Vicente s/n , E03080 Alicante , Spain
| | - Andrea Cardenas-Arenas
- Department of Inorganic Chemistry , University of Alicante , Carretera de San Vicente s/n , E03080 Alicante , Spain
| | - Arantxa Davó-Quiñonero
- Department of Inorganic Chemistry , University of Alicante , Carretera de San Vicente s/n , E03080 Alicante , Spain
| | - Dolores Lozano-Castelló
- Department of Inorganic Chemistry , University of Alicante , Carretera de San Vicente s/n , E03080 Alicante , Spain
| | - Agustín Bueno-López
- Department of Inorganic Chemistry , University of Alicante , Carretera de San Vicente s/n , E03080 Alicante , Spain
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Catalytic oxidation of CO on mesoporous codoped ceria catalysts: Insights into correlation of physicochemical property and catalytic activity. J RARE EARTH 2019. [DOI: 10.1016/j.jre.2018.11.018] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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17
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High Performance of Mn-Doped MgAlOx Mixed Oxides for Low Temperature NOx Storage and Release. Catalysts 2019. [DOI: 10.3390/catal9080677] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
NOx storage-reduction (NSR) is a potential approach for the effective removal of NOx under the lean conditions in lean-burn engines. Herein, manganese-doped mixed oxides (Mn/MgAlOx) with high performance for low temperature NOx storage and release were derived from hydrotalcites precursors prepared by a facile coprecipitation method. The catalysts were characterized by X-ray diffraction (XRD), SEM, N2 adsorption-desorption, H2-TPR, FT-IR, and X-ray photoelectron spectroscopy (XPS) techniques. The Mn-doped MgAlOx catalysts exhibited high NOx storage capacity (NSC) at low temperature range (150–300 °C), which was related to their increased surface area, improved reducibility and higher surface Mn3+ content. The largest NSC measured, 426 μmol/g, was observed for NOx adsorption at 200 °C on Mn15 catalyst (the sample containing 15 wt% of Mn). The in situ DRIFTS spectra of NOx adsorption proved that the Mn-doped hydrotalcite catalysts are preferred for low temperature NOx storage and release due to their ability to store NOx mainly in the form of thermally labile nitrites. NSR cycling tests revealed the NOx removal rate of Mn15 sample can reach above 70% within the wide temperature range of 150–250 °C. Besides, the influence of CO2, soot, H2O and SO2 on NOx storage performance of Mn15 catalyst was also studied. In all, owning to their excellent NOx storage capacity, NSR cycling performance, and resistance to CO2, soot, SO2 and H2O, the Mn-doped MgAlOx NSR catalysts have broad application prospects in NOx control at low temperatures.
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18
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Catalytic Combustion of Diesel Soot on Ce/Zr Series Catalysts Prepared by Sol-Gel Method. Catalysts 2019. [DOI: 10.3390/catal9080646] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Cerium-zirconium (Ce-Zr) solid solutions have been extensively used in a wide variety of catalytic processes due to their unique catalytic features in conjunction with lower cost compared to noble metal-based systems. A series of Ce-Zr-based catalysts was prepared by the sol-gel method. The structure and morphology of these catalysts were characterized by X-ray diffraction, thermogravimetric-differential scanning calorimetry, scanning electron microscopy, energy dispersive spectroscopy, and X-ray photoelectron spectroscopy. Furthermore, investigation on catalytic performance was carried out by constructing a test platform, and the result indicated that the catalysts apparently decreased the soot ignition temperature. These catalysts exhibited higher catalytic activity for soot oxidation under narrow contact conditions. The results revealed that some soot particles could react with adsorbed oxygen, and other part of diesel soot reacted with lattice oxygen. The activity of these catalysts was attributed to synergistic effect arising from the combination of K/Co/Zr and Ce-Zr solid solution, which led to the decrease in the ignition temperature to 294 °C (data from the test platform). The catalyst still keeps good stability and catalytic activity after the cycle oxidation experiment. A reaction pathway was proposed to explain catalytic combustion process of soot, i.e., combination of K/Co/Zr with Ce-Zr solid solution reduced the binding energy of Ce-Zr solid solution, which was conducive to provide more active sites to release the active oxygen (O2−) or lattice oxygen (O2−).
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Han W, Dong F, Zhao H, Tang Z. Outstanding Water‐Resistance Pd‐Co Nanoparticles Functionalized Mesoporous Carbon Catalyst for CO Catalytic Oxidation at Room Temperature. ChemistrySelect 2018. [DOI: 10.1002/slct.201800959] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Weiliang Han
- State Key Laboratory for Oxo Synthesis and Selective OxidationNational Engineering Research Center for Fine Petrochemical IntermediatesLanzhou Institute of Chemical PhysicsChinese Academy of Sciences Lanzhou 730000 China
| | - Fang Dong
- State Key Laboratory for Oxo Synthesis and Selective OxidationNational Engineering Research Center for Fine Petrochemical IntermediatesLanzhou Institute of Chemical PhysicsChinese Academy of Sciences Lanzhou 730000 China
| | - Haijun Zhao
- State Key Laboratory for Oxo Synthesis and Selective OxidationNational Engineering Research Center for Fine Petrochemical IntermediatesLanzhou Institute of Chemical PhysicsChinese Academy of Sciences Lanzhou 730000 China
| | - Zhicheng Tang
- State Key Laboratory for Oxo Synthesis and Selective OxidationNational Engineering Research Center for Fine Petrochemical IntermediatesLanzhou Institute of Chemical PhysicsChinese Academy of Sciences Lanzhou 730000 China
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Zhu H, Chen Y, Wang Z, Liu W, Wang L. Catalytic oxidation of CO over mesoporous copper-doped ceria catalysts via a facile CTAB-assisted synthesis. RSC Adv 2018; 8:14888-14897. [PMID: 35541330 PMCID: PMC9079958 DOI: 10.1039/c8ra02327a] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Accepted: 04/05/2018] [Indexed: 11/21/2022] Open
Abstract
Nanosized copper-doped ceria CuCe catalysts with a large surface area and well-developed mesoporosity were synthesized by a surfactant-assisted co-precipitation method. The prepared catalysts with different Cu doping concentrations were characterized by XRD, DLS analysis, TEM, BET, Raman, H2-TPR and in situ DRIFTS techniques. The influence of Cu content on their catalytic performance for CO oxidation was also studied. The XRD results indicate that at a lower content, the Cu partially incorporates into the CeO2 lattice to form a CuCe solid solution, whereas a higher Cu doping causes the formation of bulk CuO. Copper doping favors an increase in the surface area of the CuCe catalysts and the formation of oxygen vacancies, thereby improving the redox properties. The CuCe samples exhibit higher catalytic performance compared to bare CeO2 and CuO catalysts. This is ascribed to the synergistic interaction between copper oxide and ceria. In particular, the Cu0.1Ce catalyst shows the highest catalytic performance (T 50 = 59 °C), as well as excellent stability. The in situ DRIFTS results show that CO adsorbed on surface Cu+ (Cu+-CO species) can easily react with the active oxygen, while stronger adsorption of carbonate-like species causes catalyst deactivation during the reaction.
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Affiliation(s)
- Hongjian Zhu
- School of Resources and Environment, Key Laboratory of Water Resources and Environmental Engineering in Universities of Shandong, University of Jinan 336 Nanxinzhuangxi Road Jinan 250022 PR China
| | - Yingying Chen
- School of Resources and Environment, Key Laboratory of Water Resources and Environmental Engineering in Universities of Shandong, University of Jinan 336 Nanxinzhuangxi Road Jinan 250022 PR China
| | - Zhongpeng Wang
- School of Resources and Environment, Key Laboratory of Water Resources and Environmental Engineering in Universities of Shandong, University of Jinan 336 Nanxinzhuangxi Road Jinan 250022 PR China
| | - Wei Liu
- School of Resources and Environment, Key Laboratory of Water Resources and Environmental Engineering in Universities of Shandong, University of Jinan 336 Nanxinzhuangxi Road Jinan 250022 PR China
| | - Liguo Wang
- School of Resources and Environment, Key Laboratory of Water Resources and Environmental Engineering in Universities of Shandong, University of Jinan 336 Nanxinzhuangxi Road Jinan 250022 PR China
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