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Sawatmongkhon B, Promhuad P, Thaisruang T, Theinnoi K, Sittichompoo S, Wongchang T, Sukjit E. Kinetic Analysis of Devolatilized Diesel-Soot Oxidation Catalyzed by Ag/Al 2O 3 and Ag/CeO 2 Using Isoconversional and Master-Plots Techniques. ACS OMEGA 2023; 8:29437-29447. [PMID: 37599922 PMCID: PMC10433343 DOI: 10.1021/acsomega.3c02971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Accepted: 07/20/2023] [Indexed: 08/22/2023]
Abstract
This work presented the kinetic analysis of devolatilized diesel-soot combustion accelerated by Ag/Al2O3 and Ag/CeO2 catalysts. Isoconversional and master-plots techniques were employed to estimate activation energy and identify the reaction model. The apparent activation energy of uncatalyzed soot oxidation was 101.85 kJ/mol, and it was reduced to 61.85 and 82.78 kJ/mol for the combustion catalyzed by Ag/Al2O3 and Ag/CeO2, respectively. The reaction-order model, f(α) = (1- α)n, with n of 1.4, 1, and 1 showed the best fit for the uncatalyzed soot oxidation and soot oxidation catalyzed by Ag/Al2O3 and Ag/CeO2, respectively. The proposed single-step reaction models were quite capable of reproducing experiments for the uncatalyzed soot oxidation and soot oxidation catalyzed by Ag/CeO2. In the presence of Ag/Al2O3, the oxidation rate at the first 20% of conversion was faster than the 1st-order reaction reflecting that the soot was rapidly oxidized by highly active species generated by Ag/Al2O3. The oxidation of the remaining soot closely followed the 1st-order reaction mechanism.
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Affiliation(s)
- Boonlue Sawatmongkhon
- College
of Industrial Technology, King Mongkut’s
University of Technology North Bangkok, 1518 Pracharat 1 Road, Wongsawang, Bangsue, Bangkok 10800, Thailand
- Research
Centre for Combustion Technology and Alternative Energy (CTAE), Science
and Technology Research Institute, King
Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
| | - Punya Promhuad
- College
of Industrial Technology, King Mongkut’s
University of Technology North Bangkok, 1518 Pracharat 1 Road, Wongsawang, Bangsue, Bangkok 10800, Thailand
| | - Thanawat Thaisruang
- College
of Industrial Technology, King Mongkut’s
University of Technology North Bangkok, 1518 Pracharat 1 Road, Wongsawang, Bangsue, Bangkok 10800, Thailand
| | - Kampanart Theinnoi
- College
of Industrial Technology, King Mongkut’s
University of Technology North Bangkok, 1518 Pracharat 1 Road, Wongsawang, Bangsue, Bangkok 10800, Thailand
- Research
Centre for Combustion Technology and Alternative Energy (CTAE), Science
and Technology Research Institute, King
Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
| | - Sak Sittichompoo
- College
of Industrial Technology, King Mongkut’s
University of Technology North Bangkok, 1518 Pracharat 1 Road, Wongsawang, Bangsue, Bangkok 10800, Thailand
- Research
Centre for Combustion Technology and Alternative Energy (CTAE), Science
and Technology Research Institute, King
Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
| | - Thawatchai Wongchang
- Research
Centre for Combustion Technology and Alternative Energy (CTAE), Science
and Technology Research Institute, King
Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
- Department
of Mechanical and Automotive Engineering Technology, Faculty of Engineering
and Technology, King Mongkut’s University
of Technology North Bangkok (Rayong Campus), Rayong 21120, Thailand
| | - Ekarong Sukjit
- School
of Mechanical Engineering, Institute of Engineering, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
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2
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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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Abstract
The energy efficiency of Gasoline Direct Injection (GDI) engines is leading to a continuous increase in GDI engine vehicle population. Consequently, their particulate matter (soot) emissions are also becoming a matter of concern. As required for diesel engines, to meet the limits set by regulations, catalyzed particulate filters are considered as an effective solution through which soot could be trapped and burnt out. However, in contrast to diesel application, the regeneration of gasoline particulate filters (GPF) is critical, as it occurs with almost an absence of NOx and under oxygen deficiency. Therefore, in the recent years it was of scientific interest to develop efficient soot oxidation catalysts that fit such particular gasoline operating conditions. Among them ceria- and perovskite-based formulations are emerging as the most promising materials. This overview summarizes the very recent academic contributions focusing on soot oxidation materials for GDI, in order to point out the most promising directions in this research area.
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Li R, Xu X, Zhu B, Li XY, Ning Y, Mu R, Du P, Li M, Wang H, Liang J, Chen Y, Gao Y, Yang B, Fu Q, Bao X. In situ identification of the metallic state of Ag nanoclusters in oxidative dispersion. Nat Commun 2021; 12:1406. [PMID: 33658489 PMCID: PMC7930130 DOI: 10.1038/s41467-021-21552-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Accepted: 01/12/2021] [Indexed: 11/21/2022] Open
Abstract
Oxidative dispersion has been widely used in regeneration of sintered metal catalysts and fabrication of single atom catalysts, which is attributed to an oxidation-induced dispersion mechanism. However, the interplay of gas-metal-support interaction in the dispersion processes, especially the gas-metal interaction has not been well illustrated. Here, we show dynamic dispersion of silver nanostructures on silicon nitride surface under reducing/oxidizing conditions and during carbon monoxide oxidation reaction. Utilizing environmental scanning (transmission) electron microscopy and near-ambient pressure photoelectron spectroscopy/photoemission electron microscopy, we unravel a new adsorption-induced dispersion mechanism in such a typical oxidative dispersion process. The strong gas-metal interaction achieved by chemisorption of oxygen on nearly-metallic silver nanoclusters is the internal driving force for dispersion. In situ observations show that the dispersed nearly-metallic silver nanoclusters are oxidized upon cooling in oxygen atmosphere, which could mislead to the understanding of oxidation-induced dispersion. We further understand the oxidative dispersion mechanism from the view of dynamic equilibrium taking temperature and gas pressure into account, which should be applied to many other metals such as gold, copper, palladium, etc. and other reaction conditions. Designing ultra small metal nanoclusters or single atoms with metallic state is a challenge. Here, the authors demonstrate the stabilization of ultra small silver clusters in the nearly-metallic state by oxygen adsorption at high temperature, using in situ spectroscopy and microscope technologies.
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Affiliation(s)
- Rongtan Li
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Xiaoyan Xu
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian, China.,Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian, China
| | - Beien Zhu
- Interdisciplinary Research Center, Shanghai Advanced Research Institute, The Chinese Academy of Sciences, Shanghai, China.,Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, The Chinese Academy of Sciences, Shanghai, China
| | - Xiao-Yan Li
- University of Chinese Academy of Sciences, Beijing, China.,Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, The Chinese Academy of Sciences, Shanghai, China
| | - Yanxiao Ning
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian, China
| | - Rentao Mu
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian, China
| | - Pengfei Du
- University of Chinese Academy of Sciences, Beijing, China.,Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian, China
| | - Mengwei Li
- Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian, China
| | - Huike Wang
- School of Materials Science and Engineering, National Institute for Advanced Materials, Nankai University, Tianjin, China
| | - Jiajie Liang
- School of Materials Science and Engineering, National Institute for Advanced Materials, Nankai University, Tianjin, China
| | - Yongsheng Chen
- Key Laboratory of Functional Polymer Materials of Ministry of Education, College of Chemistry, Nankai University, Tianjin, China
| | - Yi Gao
- Interdisciplinary Research Center, Shanghai Advanced Research Institute, The Chinese Academy of Sciences, Shanghai, China. .,Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, The Chinese Academy of Sciences, Shanghai, China.
| | - Bing Yang
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian, China. .,Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian, China.
| | - Qiang Fu
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian, China. .,Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian, China.
| | - Xinhe Bao
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian, China. .,Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian, China.
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van der Wal LI, Turner SJ, Zečević J. Developments and advances in in situ transmission electron microscopy for catalysis research. Catal Sci Technol 2021. [DOI: 10.1039/d1cy00258a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Recent developments and advances in in situ TEM have raised the possibility to study every step during the catalysts' lifecycle. This review discusses the current state, opportunities and challenges of in situ TEM in the realm of catalysis.
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Affiliation(s)
- Lars I. van der Wal
- Materials Chemistry and Catalysis
- Debye Institute for Nanomaterials Science
- Utrecht University
- Utrecht
- The Netherlands
| | - Savannah J. Turner
- Materials Chemistry and Catalysis
- Debye Institute for Nanomaterials Science
- Utrecht University
- Utrecht
- The Netherlands
| | - Jovana Zečević
- Materials Chemistry and Catalysis
- Debye Institute for Nanomaterials Science
- Utrecht University
- Utrecht
- The Netherlands
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Murata K, Ohyama J, Satsuma A. Kinetic analysis of Ag particle redispersion into ZSM-5 in the presence of coke using in situ XAFS. Catal Sci Technol 2021. [DOI: 10.1039/d0cy01989e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
In the present study, the redispersion behavior of Ag particles on ZSM-5 in the presence of coke was observed using in situ X-ray absorption fine structure (XAFS) spectroscopy.
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Affiliation(s)
- Kazumasa Murata
- Graduate School of Engineering
- Nagoya University
- Nagoya 464-8603
- Japan
| | - Junya Ohyama
- Faculty of Advanced Science and Technology
- Kumamoto University
- Kumamoto 860-8555
- Japan
- Elements Strategy Initiative for Catalysts and Batteries (ESICB)
| | - Atsushi Satsuma
- Graduate School of Engineering
- Nagoya University
- Nagoya 464-8603
- Japan
- Elements Strategy Initiative for Catalysts and Batteries (ESICB)
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7
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He B, Zhang Y, Liu X, Chen L. In‐situ Transmission Electron Microscope Techniques for Heterogeneous Catalysis. ChemCatChem 2020. [DOI: 10.1002/cctc.201902285] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Bowen He
- In-situ Center for Physical Sciences School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P.R. China
| | - Yixiao Zhang
- In-situ Center for Physical Sciences School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P.R. China
| | - Xi Liu
- In-situ Center for Physical Sciences School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P.R. China
- SynCat@BeijingSynfuels China Technology Co.Ltd Beijing 101407 P.R. China
- State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of Sciences Taiyuan 030001 P.R. China
| | - Liwei Chen
- In-situ Center for Physical Sciences School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P.R. China
- i-Lab, CAS Center for Excellence in Nanoscience Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO)Chinese Academy of Sciences Suzhou 215123 P.R. China
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8
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Wang F, Ma J, Xin S, Wang Q, Xu J, Zhang C, He H, Cheng Zeng X. Resolving the puzzle of single-atom silver dispersion on nanosized γ-Al 2O 3 surface for high catalytic performance. Nat Commun 2020; 11:529. [PMID: 31988282 PMCID: PMC6985108 DOI: 10.1038/s41467-019-13937-1] [Citation(s) in RCA: 57] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Accepted: 12/09/2019] [Indexed: 11/08/2022] Open
Abstract
Ag/γ-Al2O3 is widely used for catalyzing various reactions, and its performance depends on the valence state, morphology and dispersion of Ag species. However, detailed anchoring mechanism of Ag species on γ-Al2O3 remains largely unknown. Herein, we reveal that the terminal hydroxyls on γ-Al2O3 are responsible for anchoring Ag species. The abundant terminal hydroxyls existed on nanosized γ-Al2O3 can lead to single-atom silver dispersion, thereby resulting in markedly enhanced performance than the Ag cluster on microsized γ-Al2O3. Density-functional-theory calculations confirm that Ag atom is mainly anchored by the terminal hydroxyls on (100) surface, forming a staple-like local structure with each Ag atom bonded with two or three terminal hydroxyls. Our finding resolves the puzzle on why the single-atom silver dispersion can be spontaneously achieved only on nanosized γ-Al2O3, but not on microsized γ-Al2O3. The obtained insight into the Ag species dispersion will benefit future design of more efficient supported Ag catalysts.
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Affiliation(s)
- Fei Wang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Jinzhu Ma
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
| | - Shaohui Xin
- University of Chinese Academy of Sciences, Beijing, 100049, China
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan, 430071, China
| | - Qiang Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan, 430071, China
| | - Jun Xu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan, 430071, China
| | - Changbin Zhang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
- University of Chinese Academy of Sciences, Beijing, 100049, China.
| | - Hong He
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
| | - Xiao Cheng Zeng
- Department of Chemistry, Department of Chemical & Biomolecular Engineering, and Department of Mechanical & Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA.
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10
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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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11
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Shromova OA, Kinnunen N, Pakkanen TA, Suvanto M. Promotion effect of water in catalytic fireplace soot oxidation over silver and platinum. RSC Adv 2017. [DOI: 10.1039/c7ra09291a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The activity of the catalysts in the fireplace soot oxidation depends on water content in the gas feed. Water is partially dissociated with formation of hydroxyls over silver and platinum, which promote soot oxidation.
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Affiliation(s)
- O. A. Shromova
- Department of Chemistry
- University of Eastern Finland
- Joensuu
- Finland
| | - N. M. Kinnunen
- Department of Chemistry
- University of Eastern Finland
- Joensuu
- Finland
| | - T. A. Pakkanen
- Department of Chemistry
- University of Eastern Finland
- Joensuu
- Finland
| | - M. Suvanto
- Department of Chemistry
- University of Eastern Finland
- Joensuu
- Finland
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