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He X, Qiao T, Zhang Z, Liu H, Wang S, Wang X. Carbon cloth supporting spinel CuMn 0.5Co 2O 4 nanoneedles with the regulated electronic structure by multiple metal elements as catalysts for efficient oxygen evolution reaction. J Colloid Interface Sci 2023; 649:635-645. [PMID: 37364463 DOI: 10.1016/j.jcis.2023.06.084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2023] [Revised: 06/12/2023] [Accepted: 06/14/2023] [Indexed: 06/28/2023]
Abstract
Developing transition metal oxide catalysts to replace the noble metal oxide catalysts for efficient oxygen evolution reaction (OER) is essential to promote the practical application of water splitting. Herein, we designed and constructed the carbon cloth (CC) supporting spinel CuMn0.5Co2O4 nanoneedles with regulated electronic structure by multiple metal elements with variable chemical valences in the spinel CuMn0.5Co2O4. The carbon cloth not only provided good conductivity for the catalytic reaction but also supported the well-standing spinel CuMn0.5Co2O4 nanoneedles arrays with a large special surface area. Meanwhile, the well-standing nanoneedles arrays and mesoporous structure of CuMn0.5Co2O4 nanoneedles enhanced their wettability and facilitated access for electrolyte to electrochemical catalysis. Besides, the regulated electronic structure and generated oxygen vacancies of CuMn0.5Co2O4/CC by multiple metal elements improved the intrinsic catalytic activity and the durability of OER activity. Profiting from these merits, the CuMn0.5Co2O4/CC electrode exhibited superior OER activity with an ultralow overpotential of 189 mV at the current density of 10 mA⋅cm-2 and a smaller Tafel slope of 64.1 mV⋅dec-1, which was competitive with the noble metal oxides electrode. And the CuMn0.5Co2O4/CC electrode also exhibited long-term durability for OER with 95.3% of current retention after 1000 cycles. Therefore, the competitive OER activity and excellent cycling durability suggested that the CuMn0.5Co2O4/CC electrode is a potential candidate catalyst for efficient OER.
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Affiliation(s)
- Xuanmeng He
- School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, PR China.
| | - Tong Qiao
- School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, PR China
| | - Zeqin Zhang
- School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, PR China
| | - Hui Liu
- School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, PR China
| | - Shaolan Wang
- School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, PR China
| | - Xinzhen Wang
- School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, PR China
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Zhang Z, Dong R, Lan G, Yuan T, Tan D. Diesel particulate filter regeneration mechanism of modern automobile engines and methods of reducing PM emissions: a review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:39338-39376. [PMID: 36750514 PMCID: PMC9905014 DOI: 10.1007/s11356-023-25579-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Accepted: 01/23/2023] [Indexed: 06/18/2023]
Abstract
Diesel particulate filter (DPF) is considered as an effective method to control particulate matter (PM) emissions from diesel engines, which is included in the mandatory installation list by more and more national/regional laws and regulations, such as CHINA VI, Euro VI, and EPA Tier3. Due to the limited capacity of DPF to contain PM, the manufacturer introduced a method of treating deposited PM by oxidation, which is called regeneration. This paper comprehensively summarizes the most advanced regeneration technology, including filter structure, new catalyst formula, accurate soot prediction, safe and reliable regeneration strategy, uncontrolled regeneration and its control methods. In addition, due to the change of working conditions in the regeneration process, the additional emissions during regeneration are discussed in this paper. The DPF is not only the aftertreatment device but also can be combined with diesel oxidation catalyst (DOC), selective catalytic reduction (SCR) and exhaust recirculation (EGR). In addition, the impact of DPF modification on the original system of some old models has been reasonably discussed in order to achieve emission targets.
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Affiliation(s)
- Zhiqing Zhang
- Research Center of Guangxi Industry High-Quality Development, Guangxi University of Science and Technology, Liuzhou, 545006, China
- School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China
- School of Mechanical and Marine Engineering, Beibu Gulf University, Qinzhou, 535011, China
| | - Rui Dong
- Research Center of Guangxi Industry High-Quality Development, Guangxi University of Science and Technology, Liuzhou, 545006, China
- School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China
| | - Guanglin Lan
- School of Mechanical and Marine Engineering, Beibu Gulf University, Qinzhou, 535011, China
| | - Tao Yuan
- Purchasing Department, SAIC GM Wuling Automobile Co., Ltd, Liuzhou, 545007, China
| | - Dongli Tan
- Research Center of Guangxi Industry High-Quality Development, Guangxi University of Science and Technology, Liuzhou, 545006, China.
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3
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He X, Qiao T, Li B, Zhang Z, Wang S, Wang X, Liu H. Tuning Electronic Structure of CuCo
2
O
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Spinel via Mn‐Doping for Enhancing Oxygen Evolution Reaction. ChemElectroChem 2022. [DOI: 10.1002/celc.202200933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Xuanmeng He
- School of Materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials Shaanxi University of Science and Technology Xi'an Shaanxi 710021 P. R. China
| | - Tong Qiao
- School of Materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials Shaanxi University of Science and Technology Xi'an Shaanxi 710021 P. R. China
| | - Beijun Li
- School of Materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials Shaanxi University of Science and Technology Xi'an Shaanxi 710021 P. R. China
| | - Zeqin Zhang
- School of Materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials Shaanxi University of Science and Technology Xi'an Shaanxi 710021 P. R. China
| | - Shaolan Wang
- School of Materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials Shaanxi University of Science and Technology Xi'an Shaanxi 710021 P. R. China
| | - Xinzhen Wang
- School of Materials Science and Engineering Shandong University of Science and Technology Qingdao Shandong 266590 P. R. China
| | - Hui Liu
- School of Materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials Shaanxi University of Science and Technology Xi'an Shaanxi 710021 P. R. China
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4
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Farchado M, San Vicente G, Germán N, Maffiotte C, Morales Á. A Highly Stable and Sustainable Low-Temperature Selective Absorber: Structural and Ageing Characterisation. MATERIALS 2022; 15:ma15103427. [PMID: 35629465 PMCID: PMC9148158 DOI: 10.3390/ma15103427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Revised: 05/03/2022] [Accepted: 05/08/2022] [Indexed: 02/01/2023]
Abstract
Solar absorbers in a three-layer configuration have been prepared by dip-coating onto aluminium substrates. They are constituted by two spinel layers with one silica layer on the top and values of solar absorptance above 0.950 and thermal emittance below 0.04 were obtained. The effects of using different sintering conditions of the upper silica layer on the optical behaviour and durability tests have been studied. Results obtained in accelerated ageing methods, such as thermal stability tests and condensation tests, clearly show that the proposed selective absorber exhibits excellent thermal stability and very good humidity resistance. The results show that the protective action is due not only to the silica layer but also to the alumina layer produced during the absorber preparation. The phase composition of the individual layers was independently confirmed using X-ray diffraction and corroborated by X-ray Photoelectron Spectroscopy. Spinel-like phases were obtained in both the first and second layers. The ageing study shows that the three-layer configuration proposed has a very high potential, in terms of both durability and optical behaviour, for solar thermal low-temperature applications.
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Affiliation(s)
- Meryem Farchado
- Unidad de Materiales para Tecnologías Termosolares de Concentración, Plataforma Solar de Almería, Departamento de Energía, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Avda. Complutense 40, 28040 Madrid, Spain; (G.S.V.); (N.G.); (Á.M.)
- Correspondence:
| | - Gema San Vicente
- Unidad de Materiales para Tecnologías Termosolares de Concentración, Plataforma Solar de Almería, Departamento de Energía, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Avda. Complutense 40, 28040 Madrid, Spain; (G.S.V.); (N.G.); (Á.M.)
| | - Nuria Germán
- Unidad de Materiales para Tecnologías Termosolares de Concentración, Plataforma Solar de Almería, Departamento de Energía, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Avda. Complutense 40, 28040 Madrid, Spain; (G.S.V.); (N.G.); (Á.M.)
| | - César Maffiotte
- División de Materiales de Interés Energético, Departamento de Tecnología, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Avda. Complutense 40, 28040 Madrid, Spain;
| | - Ángel Morales
- Unidad de Materiales para Tecnologías Termosolares de Concentración, Plataforma Solar de Almería, Departamento de Energía, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Avda. Complutense 40, 28040 Madrid, Spain; (G.S.V.); (N.G.); (Á.M.)
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5
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Preparation of Cordierite Monolith Catalysts with the Coating of K-Modified Spinel MnCo2O4 Oxide and Their Catalytic Performances for Soot Combustion. Catalysts 2022. [DOI: 10.3390/catal12030295] [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
Diesel engines are important for heavy-duty vehicles. However, particulate matter (PM) released from diesel exhaust should be eliminated. Nowadays, catalytic diesel particulate filters (CDPF) are recognized as a promising technology. In this work, a series of monolith Mn1−nKnCo2O4 catalysts were prepared by the simple citric acid method. The as-prepared catalysts displayed good catalytic performance for soot combustion and the Mn0.7K0.3Co2O4 catalyst gave the best catalytic performance among all the prepared samples. The T10 and Tm of Mn0.7K0.3Co2O4-HC catalyst for soot combustion are 310 and 439 °C, respectively. The physical and chemical properties of catalysts were characterized by means of SEM, XPS, H2-TPR, Raman and other techniques. The characterization results indicate that K substitution is favorable for the formation of oxygen vacancies, enhancing the mobility of active oxygen species, and improving the redox properties and so on. In-situ Raman results prove that the strength of Co-O bonds in the catalysts became weak during the reaction at high temperatures. In addition, SEM and ultrasonic test results show that the peeling rate of the coat-layer is less than 5%. The as-prepared catalysts can be taken as one kind of candidate catalyst for promising application in soot combustion because of its facile synthesis, low cost and high catalytic activity.
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6
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Li T, Abuelgasim S, Xiao Y, Liu C, Wang W, Liu D, Ying Y. Investigation of alkali metals addition on the catalytic activity of CuFe2O4 for soot oxidation. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.120224] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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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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8
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Hadded A, Massoudi J, Gharbi S, Dhahri E, Tozri A, Berber MR. Study of physical properties of a ferrimagnetic spinel Cu 1.5Mn 1.5O 4: spin dynamics, magnetocaloric effect and critical behavior. RSC Adv 2021; 11:25664-25676. [PMID: 35478869 PMCID: PMC9037015 DOI: 10.1039/d1ra03732c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Accepted: 07/13/2021] [Indexed: 11/21/2022] Open
Abstract
The present work reports a detailed study of the spin dynamics, magnetocaloric effect and critical behaviour near the magnetic phase transition temperature, of a ferrimagnetic spinel Cu1.5Mn1.5O4. The dynamic magnetic properties investigated using frequency-dependent ac magnetic susceptibility fitted using different phenomenological models such as Neel-Arrhenius, Vogel-Fulcher and power law, strongly indicate the presence of a cluster-glass-like behavior of Cu1.5Mn1.5O4 at 40 K. The magnetization data have revealed that our compound displays an occurrence of second-order paramagnetic (PM) to ferrimagnetic (FIM) phase transition at the Curie temperature T C = 80 K as the temperature decrease. In addition, the magnetic entropy change (ΔS M) was calculated using two different methods: Maxwell relations and Landau theory. An acceptable agreement was found between both sets of data, which proves the importance of both electron interaction and magnetoelastic coupling in the magnetocaloric effect (MCE) properties of Cu1.5Mn1.5O4. The relative cooling power (RCP) reaches 180.13 (J kg-1) for an applied field at 5 T, making our compound an effective candidate for magnetic refrigeration applications. The critical exponents β, γ and δ as well as transition temperature T C were extracted from various techniques indicating that the magnetic interaction in our sample follows the 3D-Ising model. The validity of the critical exponents is confirmed by applying the Windom scaling hypothesis.
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Affiliation(s)
- Abir Hadded
- Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax 3000 Tunisia
| | - Jalel Massoudi
- Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax 3000 Tunisia
| | - Sirine Gharbi
- Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax 3000 Tunisia
| | - Essebti Dhahri
- Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax 3000 Tunisia
| | - A Tozri
- Physics Department, College of Science, Jouf University Sakaka 2014 Saudi Arabia
| | - Mohamed R Berber
- Chemistry Department, College of Science, Jouf University Sakaka 2014 Saudi Arabia
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9
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Al-Senani GM, Abd-Elkader OH, Deraz NM. Fabrication of Cu1.5Mn1.5O4 Nanoparticles Using One Step Self-Assembling Route to Enhance Energy Consumption. APPLIED SCIENCES 2021; 11:2034. [DOI: 10.3390/app11052034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
The preparation of copper manganite (hopcalite, Cu1.5Mn1.5O4), as a single phase, was achieved by using a sustainable method of green synthesis. This method is based on the replacement of the conventional “brute force” ceramic preparation by the recent “soft force” green synthesis via the egg white assisted one-step method. In other words, we present a facile and rapid methodology to prepare the nanocrystalline Cu1.5Mn1.5O4 spinel as a single phase, compared to our previous work using ceramic and glycine-assisted combustion methods. The as-synthesized copper manganite was characterized using X-ray diffraction (XRD), Fourier-transform infrared (FTIR), energy-dispersive spectroscopy (EDS), and scanning electron microscope (SEM). We used a vibrating sample magnetometer to determine the magnetic properties of the prepared sample (VSM). XRD, FTIR, SEM, EDS and transmittance electron micrograph (TEM) resulted in synthesis of a successful cubic spinel Cu1.5Mn1.5O4 system with a sponge crystal structure. The particles of the prepared materials are polycrystalline in their nature and the sizes ranged between 50 and 100 nm. The magnetic measurement demonstrated that the generated nanostructure has been found to exhibit ferromagnetism at room temperature with an optimum saturation magnetization value (0.2944 emu/g).
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11
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Li JR, Zhang WP, Li C, He C. Efficient catalytic degradation of toluene at a readily prepared Mn-Cu catalyst: Catalytic performance and reaction pathway. J Colloid Interface Sci 2021; 591:396-408. [PMID: 33631527 DOI: 10.1016/j.jcis.2021.01.096] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Revised: 01/28/2021] [Accepted: 01/28/2021] [Indexed: 12/12/2022]
Abstract
Fabricating of economical transitional metal oxide-based materials with satisfied low-temperature catalytic performance and application perspective is still a challenge in deep degradation of VOCs. Here, Mn-Cu bimetallic oxides were facilely prepared by one-step hydrothermal-redox method, which displayed much higher catalytic activity in toluene oxidation than those synthesized by hydrolysis-driven redox-precipitation or co-precipitation approach. It is shown that the lattice defect and oxygen vacancy concentration over prepared materials can be tuned by controlling Cu/Mn molar ratio. Amongst, spinel structured MnCu0.5 exhibited the highest catalytic activity, superior durability and water resistance in toluene total oxidation owing to abundant surface adsorbed oxygen species, excellent low-temperature reducibility, and high amounts of Cu+ and Mn3+. In detail, the reaction rate of MnCu0.5 was over 9.0 times higher than that of MnCu0.75, MnCu0.75-P and MnCu0.75-H2O2 at relative low temperature of 210 °C. The cyclic redox process with easier oxygen species mobility played a key role in the catalytic oxidation of toluene. Typical reaction intermediates as benzyl alcohol, benzaldehyde, benzene, phenol, and benzoquinone could be detected by PTR-MS, which further decomposed to acetone, ethanol, ketone, acetic acid, methanol, formaldehyde and acetaldehyde species by ring opening before total mineralization.
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Affiliation(s)
- Jian-Rong Li
- Center for Excellence in Regional Atmospheric Environment, and Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China; Zhejiang Key Laboratory of Urban Environmental Process and Pollution Control, Ningbo Urban Environment Observation and Research Station, Chinese Academy of Sciences, Ningbo 315800, PR China.
| | - Wan-Peng Zhang
- Center for Excellence in Regional Atmospheric Environment, and Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China; Zhejiang Key Laboratory of Urban Environmental Process and Pollution Control, Ningbo Urban Environment Observation and Research Station, Chinese Academy of Sciences, Ningbo 315800, PR China
| | - Chang Li
- Center for Excellence in Regional Atmospheric Environment, and Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China
| | - Chi He
- State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, PR China; National Engineering Laboratory for VOCs Pollution Control Material & Technology, University of Chinese Academy of Sciences, Beijing 101408, PR China.
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12
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Hadded A, Massoudi J, Dhahri E, Khirouni K, Costa BFO. Structural, optical and dielectric properties of Cu 1.5Mn 1.5O 4 spinel nanoparticles. RSC Adv 2020; 10:42542-42556. [PMID: 35516749 PMCID: PMC9057967 DOI: 10.1039/d0ra08405k] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Accepted: 11/04/2020] [Indexed: 11/21/2022] Open
Abstract
In this study, a Cu1.5Mn1.5O4 spinel was successfully synthesized by a sol–gel method at 500 °C for 5 h and characterized by different techniques. X-ray diffraction (XRD), Fourier transformation infrared (FTIR) spectroscopy and Raman spectroscopic analyses confirmed the formation of a spinel cubic structure with the Fd3̄m space group. The SEM proves that the grain size of our compound is of the order of 48 nm. Crystallite sizes determined from three estimates are closer to the grain size obtained from the SEM, indicating the single domain nature of the sample. The optical properties of UV-visible spectroscopy for our sample showed that the gap value is equal to 3.82 eV, making our compound a good candidate for optoelectronic applications. For electrical properties, impedance spectroscopy was performed at a frequency range of 40 ≤ frequency ≤ 106 Hz. This suggested hoping conduction due to three theoretical models. The latter can be attributed to the correlated barrier hopping (CBH) model in region I, overlapping large polaron tunneling (OLPT) in region II and non-overlapping small polaron tunneling (NSPT) mechanism in region III. One dielectric relaxation is detected from the dielectric impedance and modulus, attributed to grain contributions. This behavior was confirmed by both Nyquist and Argand's plots of dielectric impedance at different measuring temperatures. In this study, a Cu1.5Mn1.5O4 spinel was successfully synthesized by a sol–gel method at 500 °C for 5 h and characterized by different techniques.![]()
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Affiliation(s)
- Abir Hadded
- Laboratory of Applied Physics, Faculty of Sciences, University of Sfax B. P. 1171 Sfax 3000 Tunisia
| | - Jalel Massoudi
- Laboratory of Applied Physics, Faculty of Sciences, University of Sfax B. P. 1171 Sfax 3000 Tunisia
| | - Essebti Dhahri
- Laboratory of Applied Physics, Faculty of Sciences, University of Sfax B. P. 1171 Sfax 3000 Tunisia
| | - Kamel Khirouni
- Laboratory of Physics of Materials and Nanomaterials Applied to the Environment, Faculty of Sciences of Gabes Cité Erriadh, University of Gabès 6079 Gabès Tunisia
| | - B F O Costa
- University of Coimbra, CFisUC, Physics Department P-3004-516 Coimbra Portugal
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13
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Performance and Stability of Wet-Milled CoAl2O4, Ni/CoAl2O4, and Pt,Ni/CoAl2O4 for Soot Combustion. Catalysts 2020. [DOI: 10.3390/catal10040406] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Low-energy wet milling was employed to activate commercial CoAl2O4 spinel and disperse mono- and multimetallic nanoparticles on its surface. This method yielded efficient Pt,Ni catalysts for soot oxidation in simulated diesel exhaust conditions. The characterization and activity results indicated that although Ni/CoAl2O4 was highly active, the presence of Pt was required to obtain a stable Ni(0.25 wt. %),Pt(0.75 wt. %)/CoAl2O4 catalyst under the operating conditions of diesel particulate filters, and that hot spots formation must be controlled to avoid the deactivation of the cobalt aluminate. Our work provides important insight for new design strategies to develop high-efficiency low-cost catalysts. Platinum-containing multimetallic nanostructures could efficiently reduce the amount of the costly, but to date non-replaceable, Pt noble metal for a large number of industrially important catalytic processes.
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14
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Zhao H, Li H, Gu Y, Zheng T, Zhao D, Xia W, Zhao Y, Chen H. La 2O 2CO 3-Induced phase composition oscillation in La–Cu mixed oxides during repeated catalytic soot combustion. Catal Sci Technol 2019. [DOI: 10.1039/c9cy01061k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
La2O2CO3-Induced phase composition oscillation between phase 1 (CuO + La2O2CO3) and phase 2 (La2CuO4) in La–Cu mixed oxides during repeated catalytic soot combustion.
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Affiliation(s)
- Han Zhao
- Shanghai Institute of Ceramics, Chinese Academy of Sciences
- Shanghai 200050
- China
- Kunming Institute of Precious Metals
- Kunming 650106
| | - Hongcheng Li
- Kunming Institute of Precious Metals
- Kunming 650106
- China
- Kunming Sino-platinum Metals Catalyst Co. Ltd
- Kunming 650106
| | - Yongwan Gu
- Kunming Institute of Precious Metals
- Kunming 650106
- China
- Kunming Sino-platinum Metals Catalyst Co. Ltd
- Kunming 650106
| | - Tingting Zheng
- Kunming Institute of Precious Metals
- Kunming 650106
- China
- Kunming Sino-platinum Metals Catalyst Co. Ltd
- Kunming 650106
| | - Depeng Zhao
- Kunming Institute of Precious Metals
- Kunming 650106
- China
- Kunming Sino-platinum Metals Catalyst Co. Ltd
- Kunming 650106
| | - Wenzheng Xia
- Kunming Institute of Precious Metals
- Kunming 650106
- China
- Kunming Sino-platinum Metals Catalyst Co. Ltd
- Kunming 650106
| | - Yunkun Zhao
- Kunming Institute of Precious Metals
- Kunming 650106
- China
- Kunming Sino-platinum Metals Catalyst Co. Ltd
- Kunming 650106
| | - Hangrong Chen
- Shanghai Institute of Ceramics, Chinese Academy of Sciences
- Shanghai 200050
- China
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15
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Zhao H, Li H, Pan Z, Feng F, Gu Y, Chang S, Du J, Zhao Y. Reasons for the disintegration of microspherical precursor MnCO 3 for soot combustion catalysts Pt δ+/MnO x. Catal Sci Technol 2019. [DOI: 10.1039/c9cy00572b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Facile Pt(NO3)2- or NH3-treatment optimizes soot combustion catalyst MnOx by disintegrating oversized microspheres and tuning the phase-composition and physiochemical properties.
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Affiliation(s)
- Han Zhao
- State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals
- Kunming Institute of Precious Metals
- Kunming 650106
- China
- State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application
| | - Hongcheng Li
- State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals
- Kunming Institute of Precious Metals
- Kunming 650106
- China
- State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application
| | - Zaifu Pan
- State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals
- Kunming Institute of Precious Metals
- Kunming 650106
- China
- State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application
| | - Feng Feng
- State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals
- Kunming Institute of Precious Metals
- Kunming 650106
- China
- State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application
| | - Yongwan Gu
- State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals
- Kunming Institute of Precious Metals
- Kunming 650106
- China
- State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application
| | - Shiying Chang
- State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals
- Kunming Institute of Precious Metals
- Kunming 650106
- China
- State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application
| | - Junchen Du
- State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals
- Kunming Institute of Precious Metals
- Kunming 650106
- China
- State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application
| | - Yunkun Zhao
- State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals
- Kunming Institute of Precious Metals
- Kunming 650106
- China
- State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application
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16
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Neelapala SD, Patnaik H, Dasari H. Enhancement of soot oxidation activity of manganese oxide (Mn2
O3
) through doping by the formation of Mn1.9
M0.1
O3-δ
(M = Co, Cu, and Ni). ASIA-PAC J CHEM ENG 2018. [DOI: 10.1002/apj.2234] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Satya Deepika Neelapala
- Department of Chemical Engineering, Manipal Institute of Technology; Manipal Academy of Higher Education; Manipal Karnataka India
| | - Harsh Patnaik
- Department of Chemical Engineering, Manipal Institute of Technology; Manipal Academy of Higher Education; Manipal Karnataka India
| | - Harshini Dasari
- Department of Chemical Engineering, Manipal Institute of Technology; Manipal Academy of Higher Education; Manipal Karnataka India
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17
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Kuwahara Y, Fujibayashi A, Uehara H, Mori K, Yamashita H. Catalytic combustion of diesel soot over Fe and Ag-doped manganese oxides: role of heteroatoms in the catalytic performances. Catal Sci Technol 2018. [DOI: 10.1039/c8cy00077h] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fe/Ag-doped manganese oxides show promising catalytic activities in diesel soot combustion, which occurviamechanisms involving activated surface/lattice oxygen species.
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Affiliation(s)
- Yasutaka Kuwahara
- Division of Materials and Manufacturing Science
- Graduate School of Engineering
- Osaka University
- Osaka 565-0871
- Japan
| | - Akihiro Fujibayashi
- Division of Materials and Manufacturing Science
- Graduate School of Engineering
- Osaka University
- Osaka 565-0871
- Japan
| | - Hiroki Uehara
- Division of Materials and Manufacturing Science
- Graduate School of Engineering
- Osaka University
- Osaka 565-0871
- Japan
| | - Kohsuke Mori
- Division of Materials and Manufacturing Science
- Graduate School of Engineering
- Osaka University
- Osaka 565-0871
- Japan
| | - Hiromi Yamashita
- Division of Materials and Manufacturing Science
- Graduate School of Engineering
- Osaka University
- Osaka 565-0871
- Japan
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18
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Yap YH, Lim MSW, Lee ZY, Lai KC, Jamaal MA, Wong FH, Ng HK, Lim SS, Tiong TJ. Effects of sonication on co-precipitation synthesis and activity of copper manganese oxide catalyst to remove methane and sulphur dioxide gases. ULTRASONICS SONOCHEMISTRY 2018; 40:57-67. [PMID: 28946460 DOI: 10.1016/j.ultsonch.2017.06.032] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Revised: 06/29/2017] [Accepted: 06/30/2017] [Indexed: 06/07/2023]
Abstract
The utilisation of ultrasound in chemical preparation has been the focus of intense study in various fields, including materials science and engineering. This paper presents a novel method of synthesising the copper-manganese oxide (Hopcalite) catalyst that is used for the removal of volatile organic compounds and greenhouse gases like carbon monoxide. Several samples prepared under different conditions, with and without ultrasound, were subjected to a series of characterisation tests such as XRD, BET, FE-SEM, EDX, TPR-H2, TGA and FT-IR in order to establish their chemical and physical properties. A series of catalytic tests using a micro-reactor were subsequently performed on the samples in order to substantiate the aforementioned properties by analysing their ability to oxidise compressed natural gas (CNG), containing methane and sulphur dioxide. Results showed that ultrasonic irradiation of the catalyst led to observable alterations in its morphology: surfaces of the particles were noticeably smoothed and an increased in amorphicity was detected. Furthermore, ultrasonic irradiation has shown to enhance the catalytic activity of Hopcalite, achieving a higher conversion of methane relative to non-sonicated samples. Varying the ultrasonic intensity also produced appreciable effects, whereby an increase in intensity results in a higher conversion rate. The catalyst sonicated at the highest intensity of 29.7W/cm2 has a methane conversion rate of 13.5% at 400°C, which was the highest among all the samples tested.
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Affiliation(s)
- Yeow Hong Yap
- Department of Chemical Engineering, Lee Kong Chian Faculty of Engineering, Universiti Tunku Abdul Rahman, Jalan Sungai Long, 43000 Kajang, Selangor, Malaysia
| | - Mitchell S W Lim
- Department of Chemical and Environmental Engineering, University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor, Malaysia
| | - Zheng Yee Lee
- Department of Chemical and Environmental Engineering, University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor, Malaysia
| | - Kar Chiew Lai
- Department of Chemical and Environmental Engineering, University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor, Malaysia
| | - Muhamad Ashraf Jamaal
- Department of Chemical and Environmental Engineering, University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor, Malaysia
| | - Farng Hui Wong
- Department of Chemical Engineering, Lee Kong Chian Faculty of Engineering, Universiti Tunku Abdul Rahman, Jalan Sungai Long, 43000 Kajang, Selangor, Malaysia
| | - Hoon Kiat Ng
- Department of Mechanical, Materials and Manufacturing Engineering, University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor, Malaysia
| | - Siew Shee Lim
- Department of Chemical and Environmental Engineering, University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor, Malaysia
| | - T Joyce Tiong
- Department of Chemical and Environmental Engineering, University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor, Malaysia.
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