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Li S, Cheng G, Chen H, Li R, Xia P, Li Y, Liang X, Wang K. Mechanism of N 2O formation in catalytic after-treatment systems of ammonia/hydrogen-fuelled engines. Phys Chem Chem Phys 2024. [PMID: 39036842 DOI: 10.1039/d4cp02075h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/23/2024]
Abstract
The combustion processes and catalytic after-treatment of ammonia/hydrogen-fueled engines, including NOx storage and reduction (NSR) and noble-metal selective catalytic reduction (SCR), can produce the byproduct N2O, a potent greenhouse gas that weakens the zero-carbon attribute of these fuels. Currently, the mechanism of N2O formation on DeNOx catalysts remains unclear due to limited research on catalytic after-treatment for such engines and the complexity of surface catalytic reactions. To elucidate the formation of N2O on the DeNOx catalysts of ammonia/hydrogen fuel engines, the impact factors on N2O formation on platinum catalysts (typical catalysts in NSR and noble-metal SCR) were investigated using first-principles molecular dynamics (FPMD). By employing the blue-moon ensemble enhanced sampling method and the slow-growth approach for free energy surface exploration, together with density functional theory (DFT) for electronic structure analysis, a linear relationship between the spin splitting of the d states of Pt clusters and N2O formation energy barriers was revealed, along with the increased structural sensitivity of Pt clusters with fewer atoms. It is highlighted that the energy barrier for N2O formation is determined by the matching degree of energy levels between molecules and surfaces. These findings provide atomic-scale insights into N2O formation on DeNOx catalysts for ammonia/hydrogen-fueled engines, facilitating N2O emission control for carbon-free engines.
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Affiliation(s)
- Shilong Li
- State Key Laboratory of Engines, Tianjin University, Tianjin 300354, China.
| | - Gong Cheng
- State Key Laboratory of Engines, Tianjin University, Tianjin 300354, China.
| | - Haoran Chen
- State Key Laboratory of Engines, Tianjin University, Tianjin 300354, China.
| | - Ruichao Li
- State Key Laboratory of Engines, Tianjin University, Tianjin 300354, China.
| | - Peng Xia
- State Key Laboratory of Engines, Tianjin University, Tianjin 300354, China.
| | - Yue Li
- State Key Laboratory of Engines, Tianjin University, Tianjin 300354, China.
| | - Xingyu Liang
- State Key Laboratory of Engines, Tianjin University, Tianjin 300354, China.
| | - Kun Wang
- State Key Laboratory of Engines, Tianjin University, Tianjin 300354, China.
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2
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Muman V, Tennyson-Davies A, Allegret O, Addicoat MA. Reactions of N 2O and CO on neutral Rh 10O n clusters: a density functional study. Phys Chem Chem Phys 2024; 26:2218-2227. [PMID: 38165015 DOI: 10.1039/d3cp04929a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
Density functional theory calculations were performed to identify product, reactant and intermediate dissociative/associative structures for the oxygen abstraction and addition reactions: Rh10On + CO → Rh10On-1 + CO2, n = 1-5 and Rh10On + N2O → Rh10On+1 + N2, n = 0-4 reactions. In the case of the oxygen abstraction reactions, the energetics of the reaction path were very similar in energy regardless of the number of oxygen atoms on the Rh10On cluster, whereas for the addition of oxygen to the Rh10On cluster, the reaction was found to become significantly less exothermic with each successive addition of oxygen.
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Affiliation(s)
- Vikram Muman
- School of Science and Technology, Nottingham Trent University, Clifton Lane, Nottingham, NG11 8NS, UK.
| | - Alex Tennyson-Davies
- School of Science and Technology, Nottingham Trent University, Clifton Lane, Nottingham, NG11 8NS, UK.
| | - Oihan Allegret
- School of Science and Technology, Nottingham Trent University, Clifton Lane, Nottingham, NG11 8NS, UK.
- Univ Limoges, IRCER, UMR CNRS 7315, F-87068 Limoges, France
| | - Matthew A Addicoat
- School of Science and Technology, Nottingham Trent University, Clifton Lane, Nottingham, NG11 8NS, UK.
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3
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Yang Q, Jiang GD, He SG. Enhancing the Performance of Global Optimization of Platinum Cluster Structures by Transfer Learning in a Deep Neural Network. J Chem Theory Comput 2023; 19:1922-1930. [PMID: 36917066 DOI: 10.1021/acs.jctc.2c00923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
Abstract
The global optimization of metal cluster structures is an important research field. The traditional deep neural network (T-DNN) global optimization method is a good way to find out the global minimum (GM) of metal cluster structures, but a large number of samples are required. We developed a new global optimization method which is the combination of the DNN and transfer learning (DNN-TL). The DNN-TL method transfers the DNN parameters of the small-sized cluster to the DNN of the large-sized cluster to greatly reduce the number of samples. For the global optimization of Pt9 and Pt13 clusters in this research, the T-DNN method requires about 3-10 times more samples than the DNN-TL method, and the DNN-TL method saves about 70-80% of time. We also found that the average amplitude of parameter changes in the T-DNN training is about 2 times larger than that in the DNN-TL training, which rationalizes the effectiveness of transfer learning. The average fitting errors of the DNN trained by the DNN-TL method can be even smaller than those by the T-DNN method because of the reliability of transfer learning. Finally, we successfully obtained the GM structures of Ptn (n = 8-14) clusters by the DNN-TL method.
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Affiliation(s)
- Qi Yang
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China.,University of Chinese Academy of Sciences, Beijing 100049, PR China.,Beijing National Laboratory for Molecular Sciences and CAS Research/Education Center of Excellence in Molecular Sciences, Beijing 100190, PR China
| | - Gui-Duo Jiang
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China.,University of Chinese Academy of Sciences, Beijing 100049, PR China.,Beijing National Laboratory for Molecular Sciences and CAS Research/Education Center of Excellence in Molecular Sciences, Beijing 100190, PR China
| | - Sheng-Gui He
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China.,University of Chinese Academy of Sciences, Beijing 100049, PR China.,Beijing National Laboratory for Molecular Sciences and CAS Research/Education Center of Excellence in Molecular Sciences, Beijing 100190, PR China
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4
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Gedam SP, Chiriki S, Padmavathi D. Advanced machine learning based global optimizations for Pt nanoclusters. J INDIAN CHEM SOC 2023. [DOI: 10.1016/j.jics.2023.100978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
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5
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Nagarajan V, Chandiramouli R. Sorption studies of sulfadimethoxine and tetracycline molecules on β-antimonene nanotube - A first-principles insight. J Mol Graph Model 2021; 108:107988. [PMID: 34325354 DOI: 10.1016/j.jmgm.2021.107988] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 07/03/2021] [Accepted: 07/12/2021] [Indexed: 10/20/2022]
Abstract
We ascertained the structural firmness of β-antimonene nanotube and studied the adsorption behaviour of sulfadimethoxine (SM) and tetracycline (TC) molecules on the base substrate using density functional theory (DFT) with B86LYP-D3 level of theory. Significantly, β-antimonene nanotube displays a semiconducting character with an energy band-gap of 0.263 eV. The three dissimilar preferential adsorption sites namely, bride-, hollow-, tube-inner site of SM and TC molecules on β-antimonene nanotube were investigated using average band gap changes, Bader charge transfer along with adsorption energy. Further, the calculated adsorption energy for preferential adsorption sites is noticed to be in the scope of -0.813 eV to -3.752 eV signifying to physisorption and chemisorption form of interaction on β-antimonene nanotube. The inclusive outcome recommends that β-antimonene nanotube can be deployed as a chemi-resistive sensor to sense and remove SM and TC molecules from the contaminated aqueous medium.
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Affiliation(s)
- V Nagarajan
- School of Electrical & Electronics Engineering SASTRA Deemed University, Tirumalaisamudram, Thanjavur, 613 401, India
| | - R Chandiramouli
- School of Electrical & Electronics Engineering SASTRA Deemed University, Tirumalaisamudram, Thanjavur, 613 401, India.
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6
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Princy Maria J, Nagarajan V, Chandiramouli R. First-principles studies on sensing properties of delta arsenene nanoribbons towards hexane and heptane molecules. COMPUT THEOR CHEM 2021. [DOI: 10.1016/j.comptc.2021.113256] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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7
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Jia Y, Yu X, Zhang H, Cheng L, Luo Z. Tetrahedral Pt 10- Cluster with Unique Beta Aromaticity and Superatomic Feature in Mimicking Methane. J Phys Chem Lett 2021; 12:5115-5122. [PMID: 34029091 DOI: 10.1021/acs.jpclett.1c01178] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Utilizing a customized metal cluster source in tandem with a flow tube reactor and a reflectron time-of-flight mass spectrometer, we have obtained well-resolved pure metal clusters Ptn- and observed their gas-phase reactions with a few small gas molecules. Interestingly, the remarkable inertness of Pt10- was repeatedly observed in different reactions. Meanwhile, we have determined the structure of Pt10- within a regular tetrahedron. Considering that Pt possesses 5d96s1 electron configuration, the tetrahedral Pt10- exhibits unexpected stability at neither a magic number of valence electrons nor a shell closure of geometric structure. Comprehensive theoretical calculations unveil the stability of Pt10- is significantly associated with the all-metal aromaticity. In addition to the classical total aromaticity, which is mainly due to 6s electrons, there is unique beta-aromaticity ascribed to spin-polarized beta 5d electrons pertaining to singly occupied multicenter bonds. Further, we demonstrate the superatomic feature of such a transition metal cluster Pt10-, as Pt6@Pt4-, in mimicking methane.
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Affiliation(s)
- Yuhan Jia
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xinlei Yu
- Department of Chemistry, Anhui University, Hefei 230601, China
- Key Laboratory of Structure and Functional Regulation of Hybrid Materials (Anhui University), Ministry of Education, Hefei 230601, PR China
| | - Hanyu Zhang
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Longjiu Cheng
- Department of Chemistry, Anhui University, Hefei 230601, China
- Key Laboratory of Structure and Functional Regulation of Hybrid Materials (Anhui University), Ministry of Education, Hefei 230601, PR China
| | - Zhixun Luo
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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8
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Li L, Liu S, Jiang R, Ji Y, Li H, Guo X, Jia L, Zhong Z, Su F. Subnanometric Pt on Cu Nanoparticles Confined in Y‐zeolite: Highly‐efficient Catalysts for Selective Catalytic Reduction of NO
x
by CO. ChemCatChem 2021. [DOI: 10.1002/cctc.202001774] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Liang Li
- College of Chemistry and Chemical Engineering Qiqihaer University Qiqihaer 161006 Heilongjiang P. R. China
- State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P. R. China
| | - Shaomian Liu
- State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P. R. China
| | - Ruihuan Jiang
- College of Chemistry and Chemical Engineering Qiqihaer University Qiqihaer 161006 Heilongjiang P. R. China
- State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P. R. China
| | - Yongjun Ji
- School of Light Industry Beijing Technology and Business University Beijing 100048 P. R. China
| | - Huifang Li
- State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P. R. China
| | - Xiangfeng Guo
- College of Chemistry Guangdong University of Petrochemical Technology Guangdong Maoming 525000 P. R. China
| | - Lihua Jia
- College of Chemistry and Chemical Engineering Qiqihaer University Qiqihaer 161006 Heilongjiang P. R. China
| | - Ziyi Zhong
- College of Engineering Guangdong Technion-Israel Institute of Technology (GTIIT) Shantou 515063 P. R. China
- Technion-Israel Institute of Technology (IIT) Haifa 32000 Israel
| | - Fabing Su
- State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P. R. China
- Institute of Industrial Chemistry and Energy Technology Shenyang University of Chemical Technology Shenyang 110142 P. R. China
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9
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Bhuvaneswari R, Nagarajan V, Chandiramouli R. First-principles research on adsorption properties of o-xylene and styrene on 5–8 phosphorene sheets. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2020.138244] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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10
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Cunningham EM, Green AE, Meizyte G, Gentleman AS, Beardsmore PW, Schaller S, Pollow KM, Saroukh K, Förstel M, Dopfer O, Schöllkopf W, Fielicke A, Mackenzie SR. Infrared action spectroscopy of nitrous oxide on cationic gold and cobalt clusters. Phys Chem Chem Phys 2021; 23:329-338. [PMID: 33346764 DOI: 10.1039/d0cp05195k] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Understanding the catalytic decomposition of nitrous oxide on finely divided transition metals is an important environmental issue. In this study, we present the results of a combined infrared action spectroscopy and quantum chemical investigation of molecular N2O binding to isolated Aun+ (n ≤ 7) and Con+ (n ≤ 5) clusters. Infrared multiple-photon dissociation spectra have been recorded in the regions of both the N[double bond, length as m-dash]O (1000-1400 cm-1) and N[double bond, length as m-dash]N (2100-2450 cm-1) stretching modes of nitrous oxide. In the case of Aun+ clusters only the ground electronic state plays a role, while the involvement of energetically low-lying excited states in binding to the Con+ clusters cannot be ruled out. There is a clear preference for N-binding to clusters of both metals but some O-bound isomers are observed in the case of smaller Con(N2O)+ clusters.
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Affiliation(s)
- Ethan M Cunningham
- Department of Chemistry, University of Oxford, Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, UK.
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11
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12
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Bhuvaneswari R, Nagarajan V, Chandiramouli R. Toxicants in cigarette smoke adsorbed on red phosphorene nanosheet: A first-principles insight. Chem Phys 2020. [DOI: 10.1016/j.chemphys.2019.110604] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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13
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Interaction properties of benzyl chloride and chlorobenzene on violet phosphorene sheets – A first-principles perception. COMPUT THEOR CHEM 2019. [DOI: 10.1016/j.comptc.2019.112563] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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14
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Li X, Tang Y, Li S, Gui Y. Spectroscopic properties and activated mechanism of NO on isolated cationic tantalum clusters: A first-principles study. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 216:335-341. [PMID: 30909090 DOI: 10.1016/j.saa.2019.03.052] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Revised: 02/18/2019] [Accepted: 03/17/2019] [Indexed: 06/09/2023]
Abstract
The adsorption and dissociation of NO on the cationic Ta15+ cluster were investigated using the density-functional theory (DFT) calculations, and the Ta-centered bicapped hexagonal antiprism (BHA) structure of cationic Ta15+ cluster can be identified as the global minimum, which reproduces well the infrared multiple photo dissociation (IR-MPD) spectrum. Our results show that the cationic BHATa15+ cluster provides the hollow region for NO to interact effectively, and possess larger adsorption strength on the region than other sites. The density of states, charge density differences and frontier molecular orbitals were analyzed to understand the electronic properties of the stable NO-adsorbed isomers. The characteristic IR peaks of the firstly two low-lying isomers are properly assigned, in which the strongest IR peak originates from the N - O stretching vibration. For the dissociation of NO on the BHATa15+ cluster, it is found that the reaction path II easily occurs rather than path I due to small reaction barrier, and the cluster may possess the great catalytic behavior to dissociate NO molecule. The present results will inevitably stimulate future theoretical and experimental studies for the design of novel Ta-based catalytic materials for the NO dissociation.
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Affiliation(s)
- Xiaojun Li
- School of Science, Xi'an University of Posts and Telecommunications, Xi'an 710121, Shaanxi, China.
| | - Yongqiang Tang
- School of Chemical Engineering, Xi'an University, Xi'an, China
| | - Shuna Li
- School of Chemical Engineering, Xi'an University, Xi'an, China
| | - Yangyang Gui
- School of Chemical Engineering, Xi'an University, Xi'an, China
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15
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Bhuvaneswari R, Nagarajan V, Chandiramouli R. Exploring adsorption mechanism of hydrogen cyanide and cyanogen chloride molecules on arsenene nanoribbon from first-principles. J Mol Graph Model 2019; 89:13-21. [DOI: 10.1016/j.jmgm.2019.02.008] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2018] [Revised: 02/19/2019] [Accepted: 02/19/2019] [Indexed: 02/09/2023]
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