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Patil SS, Dasari HP. An investigation on copper-loaded ceria-praseodymium catalysts for soot oxidation activity and its kinetics. BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING 2023. [DOI: 10.1007/s43153-023-00312-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
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Fabrication of Mn-Doped SrTiO3/Carbon Fiber with Oxygen Vacancy for Enhanced Photocatalytic Hydrogen Evolution. MATERIALS 2022; 15:ma15134723. [PMID: 35806847 PMCID: PMC9267876 DOI: 10.3390/ma15134723] [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: 06/04/2022] [Revised: 06/26/2022] [Accepted: 07/01/2022] [Indexed: 01/17/2023]
Abstract
With carbon fiber, it is difficult to load semiconductor photocatalysts and easy to shed off thanks to its smooth surface and few active groups, which has always been a problem in the synthesis of photocatalysts. In the study, SrTiO3 nanoparticles were loaded onto the Tencel fibers using the solvothermal method, and then the Tencel fibers were carbonized at a high temperature under the condition of inert gas to form carbon fibers, thus SrTiO3@CF photocatalytic composite materials with solid core shell structure were prepared. Meanwhile, Mn ions were added into the SrTiO3 precursor reagent in the solvothermal experiment to prepare Mn-doped Mn-SrTiO3@CF photocatalytic composite material. XPS and EPR tests showed that the prepared Mn-SrTiO3@CF photocatalytic composite was rich in oxygen vacancies. The existence of these oxygen vacancies formed oxygen defect states (VOs) below the conduction band, which constituted the capture center of photogenerated electrons and significantly improved the photocatalytic activity. The photocatalytic hydrogen experimental results showed that the photocatalytic hydrogen production capacity of Mn-SrTiO3@CF composite material with 5% Mn-doped was six times that of the SrTiO3@CF material, and the doping of Mn ions not only promoted the red shift of the light absorption boundary and the extension to visible light, but also improved the separation and migration efficiency of photocarriers. In the paper, the preparation method solves the difficulty of loading photocatalysts on CF and provides a new design method for the recycling of catalysts, and we improve the hydrogen production performance of photocatalysts by Mn-doped modification and the introduction of oxygen vacancies, which provides a theoretical method for the practical application of hydrogen energy.
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Hou W, Feng P, Guo X, Wang Z, Bai Z, Bai Y, Wang G, Sun K. Catalytic Mechanism of Oxygen Vacancies in Perovskite Oxides for Lithium-Sulfur Batteries. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2202222. [PMID: 35534022 DOI: 10.1002/adma.202202222] [Citation(s) in RCA: 32] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Revised: 05/04/2022] [Indexed: 06/14/2023]
Abstract
Defective materials have been demonstrated to possess adsorptive and catalytic properties in lithium-sulfur (Li-S) batteries, which can effectively solve the problems of lithium polysulfides (LiPSs) shuttle and sluggish conversion kinetics during charging and discharging of Li-S batteries. However, there is still a lack of research on the quantitative relationship between the defect concentration and the adsorptive-catalytic performance of the electrode. In this work, perovskites Sr0.9 Ti1- x Mnx O3- δ (STMnx ) (x = 0.1-0.3) with different oxygen-vacancy concentrations are quantitatively regulated as research models. Through a series of tests of the adsorptive property and electrochemical performance, a quantitative relationship between oxygen-vacancy concentration and adsorptive-catalytic properties is established. Furthermore, the catalytic mechanism of oxygen vacancies in Li-S batteries is investigated using density functional theory calculations and in situ experiments. The increased oxygen vacancies can effectively increase the binding energy between perovskite and LiPSs, reduce the energy barrier of LiPSs decomposition reaction, and promote LiPSs conversion reaction kinetics. Therefore, the perovskite STMn0.3 with high oxygen-vacancy concentrations exhibits excellent LiPSs adsorptive and catalytic properties, realizing high-efficiency Li-S batteries. This work is helpful to realize the application of the quantitative regulation strategy of defect engineering in Li-S batteries.
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Affiliation(s)
- Wenshuo Hou
- Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, China
| | - Pingli Feng
- Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, China
| | - Xin Guo
- Centre for Clean Energy Technology, School of Mathematics and Physics, Faculty of Science, University of Technology Sydney, Broadway, Sydney, NSW, 2007, Australia
| | - Zhenhua Wang
- Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, China
| | - Zhe Bai
- Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, China
| | - Yu Bai
- Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, China
| | - Guoxiu Wang
- Centre for Clean Energy Technology, School of Mathematics and Physics, Faculty of Science, University of Technology Sydney, Broadway, Sydney, NSW, 2007, Australia
| | - Kening Sun
- Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, China
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Patil SS, Naik S, Ramesh MD, Dasari H, Dasari HP. A Negative Effect of Niobium Doped Ceria on Soot Oxidation Activity. Chem Eng Technol 2022. [DOI: 10.1002/ceat.202100523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Sunaina S Patil
- Chemical Engineering Department National Institute of Technology Karnataka Surathkal Mangalore 575025 India Karnataka
| | - Sahana Naik
- Chemical Engineering Department National Institute of Technology Karnataka Surathkal Mangalore 575025 India Karnataka
| | - Madhura D Ramesh
- Chemical Engineering Department National Institute of Technology Karnataka Surathkal Mangalore 575025 India Karnataka
| | - Harshini Dasari
- Manipal Academy of Higher Education (MAHE), Chemical Engineering Department Manipal Institute of Technology Manipal Udupi 576104 India Karnataka
| | - Hari Prasad Dasari
- Chemical Engineering Department National Institute of Technology Karnataka Surathkal Mangalore 575025 India Karnataka
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Reduced graphene oxide-supported PbTiO3 nanospheres: Improved ceramic photocatalyst toward enriched photooxidation of thiophene by visible light. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2020.111301] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Moreno-Román EJ, Cruz-López A, García-Gómez C, Zanella R, Suárez-Vázquez SI. Evaluation of the catalytic oxidation of soot by CeO X-LaMnO 3 at different O 2 pressures synthesized by ultrasonic-assisted hydrothermal method. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:15475-15487. [PMID: 32077020 DOI: 10.1007/s11356-020-08003-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Accepted: 02/05/2020] [Indexed: 06/10/2023]
Abstract
In this work, the synthesis of catalyst with perovskite structure and chemical formula La1-XCeXMnO3 at x = 0 - 0.5 were successfully obtained by an ultrasonic-assisted hydrothermal method. Results show that the addition of Ce in La1-XCeXMnO3 have not substantial effect in textural and morphological properties; however, the formation of a new crystalline phase with final composition CeOX-La1-XCeXMnO3 was detected at values x > 0.3. All synthesized catalysts were tested in the soot oxidation under both, loose and tight contact in 20% O2/N2 or 5% O2/N2 atmospheres. CeOX-La1-XCeXMnO3 at x = 0.3 resulted in the best catalytic activity with activation energy values of 57.9 kJ.mol-1. The interaction between Ce3+ and Mn4+ species in this catalyst can transfer electrons generating Mn3+ and Ce4+. This reduction from Mn4+ to Mn3+ is accompanied by migration of vacancies to the surface promoting the adsorbed oxygen from the gas phase, need for balancing the chemical states. By increasing the temperature above 300 °C, the bulk oxygen migration to the surface is enhanced being the responsible for the oxygen availability. The formation of CeOX-La1-XCeXMnO3 promotes a stable redox cycle allowing the reusability of this catalyst even at low oxygen pressures after three different reaction cycles.
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Affiliation(s)
- Eddy Jonatan Moreno-Román
- Universidad Autónoma de Nuevo León, Facultad de Ingeniería Civil, Av. Universidad S/N, Cd. Universitaria, 66455, San Nicolás de los Garza, Nuevo León, México
| | - Arquímedes Cruz-López
- Universidad Autónoma de Nuevo León, Facultad de Ingeniería Civil, Av. Universidad S/N, Cd. Universitaria, 66455, San Nicolás de los Garza, Nuevo León, México
| | - Celestino García-Gómez
- Universidad Autónoma de Nuevo León, Facultad de Agronomía, Francisco Villa, S/N, 66050, General Escobedo, Nuevo León, México
| | - Rodolfo Zanella
- Instituto de Ciencias Aplicadas y Tecnología, Universidad Nacional Autónoma de México, Circuito Exterior S/N, C.U, 04510, Ciudad de México, México
| | - Santiago Iván Suárez-Vázquez
- Universidad Autónoma de Nuevo León, Facultad de Ingeniería Civil, Av. Universidad S/N, Cd. Universitaria, 66455, San Nicolás de los Garza, Nuevo León, México.
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Visible light-responsive Ag/LaTiO3 nanowire photocatalysts for efficient elimination of atrazine herbicide in water. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.112163] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Cortés-Reyes M, Herrera C, Larrubia MÁ, Alemany LJ. Eliminación de carbonilla en gases de escape con catalizadores DeNOx. Determinación de parámetros cinéticos. REVISTA ION 2019. [DOI: 10.18273/revion.v32n2-2019004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Los catalizadores DeNOx se emplean en la eliminación de los óxidos de nitrógeno en vehículos diésel y, también, puede que entren en contacto con carbonilla o incluso sean utilizados como sistemas de reducción de NOx y soot simultáneamente (DPNR-Diesel Particulate NOx Reduction). Por ello, es importante profundizar en el mecanismo de interacción entre el Soot y el catalizador. Se ha utilizado un Soot Printex U modelo y un catalizador Pt-K/Al2O3, con el potasio en forma de óxido e hidroxicarbonato hidratado. Se ha estudiado mediante TG-MS el proceso de eliminación en diferentes atmósferas oxidantes. Los procesos han sido desacoplados mediante el establecimiento de la función de distribución de energía de activación. En ausencia de catalizador, se produce la combustión del carbonilla con el oxígeno molecular en fase gas a temperaturas alrededor de los 1100 K. En presencia de NO, la reducción tiene lugar a menor temperatura debido a su carácter más oxidante y a las especies de óxidos de nitrógeno retenidas y en fase gas. Si la carbonilla se encuentra en contacto con el catalizador Pt-K/Al2O3, los centros Pt-OH-K son los responsables de la eliminación vía gasificación a 780 K con una energía de activación alrededor de 85 kJ mol-1
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Zhao H, Sun L, Fu M, Mao L, Zhao X, Zhang X, Xiao Y, Dong G. Effect of A-site substitution on the simultaneous catalytic removal of NOx and soot by LaMnO3 perovskites. NEW J CHEM 2019. [DOI: 10.1039/c9nj01444f] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The simultaneous catalytic removal of NOx and soot by La1−xMxMnO3 (M = K, Sr, Pr; x = 0, 0.1, 0.2, 0.3) perovskites was investigated.
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Affiliation(s)
- Hairui Zhao
- College of Materials Science and Chemical Engineering
- Key Laboratory of Superlight Materials and Surface Technology of Education Ministry
- Harbin Engineering University
- Harbin
- China
| | - Lvesheng Sun
- College of Materials Science and Chemical Engineering
- Key Laboratory of Superlight Materials and Surface Technology of Education Ministry
- Harbin Engineering University
- Harbin
- China
| | - Maochen Fu
- College of Materials Science and Chemical Engineering
- Key Laboratory of Superlight Materials and Surface Technology of Education Ministry
- Harbin Engineering University
- Harbin
- China
| | - Lei Mao
- College of Materials Science and Chemical Engineering
- Key Laboratory of Superlight Materials and Surface Technology of Education Ministry
- Harbin Engineering University
- Harbin
- China
| | - Xuteng Zhao
- College of Materials Science and Chemical Engineering
- Key Laboratory of Superlight Materials and Surface Technology of Education Ministry
- Harbin Engineering University
- Harbin
- China
| | - Xin Zhang
- College of Materials Science and Chemical Engineering
- Key Laboratory of Superlight Materials and Surface Technology of Education Ministry
- Harbin Engineering University
- Harbin
- China
| | - Youhong Xiao
- College of Power and Energy Engineering of Harbin Engineering University
- Harbin
- China
| | - Guojun Dong
- College of Materials Science and Chemical Engineering
- Key Laboratory of Superlight Materials and Surface Technology of Education Ministry
- Harbin Engineering University
- Harbin
- China
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Patel KN, Deshpande M, Chauhan K, Rajput P, Gujarati VP, Pandya S, Sathe V, Chaki S. Effect of Mn doping concentration on structural, vibrational and magnetic properties of NiO nanoparticles. ADV POWDER TECHNOL 2018. [DOI: 10.1016/j.apt.2018.06.018] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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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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