1
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Liu Z, Lv H, Zhang Y, He JW, Han L, Li S, Yang L, Xu Y. Synergistic Etching and Hydrogen Bonding-Induced Self-Assembly of MXene/MOF Hybrid Aerogel for Flexible Room-Temperature Gas Sensing. ACS Sens 2024. [PMID: 38967239 DOI: 10.1021/acssensors.4c00745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/06/2024]
Abstract
Limited by insufficient active sites and restricted mechanical strength, designing reliable and wearable gas sensors with high activity and ductility remains a challenge for detecting hazardous gases. In this work, a thermally induced and solvent-assisted oxyanion etching strategy was implemented for selective pore opening in a rigid microporous Cu-based metal-organic framework (referred to as CuM). A conductive CuM/MXene aerogel was then self-assembled through cooperative hydrogen bonding interactions between the carbonyl oxygen atom in PVP grafted on the surface of defect-rich Cu-BTC and the surface functional hydroxyl group on MXene. A flexible NO2 sensing performance using the CuM/MXene aerogel hybridized sodium alginate hydrogel is finally achieved, demonstrating extraordinary sensitivity (S = 52.47 toward 50 ppm of NO2), good selectivity, and rapid response/recovery time (0.9/4.5 s) at room temperature. Compared with commercial sensors, the relative error is less than 7.7%, thereby exhibiting significant potential for application in monitoring toxic and harmful gases. This work not only provides insights for guiding rational synthesis of ideal structure models from MOF composites but also inspires the development of high-performance flexible gas sensors for potential multiscenario applications.
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Affiliation(s)
- Zhuo Liu
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, Liaoning 110819, China
| | - He Lv
- Qingdao Engineering Research Center for New Metallic Functional Materials, Qingdao Binhai University, Qingdao, Shandong 266555, China
| | - Yuchi Zhang
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, Liaoning 110819, China
| | - Jian Wang He
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, Liaoning 110819, China
| | - Le Han
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, Liaoning 110819, China
| | - Shuang Li
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, Liaoning 110819, China
| | - Lin Yang
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, Liaoning 110819, China
| | - Yan Xu
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, Liaoning 110819, China
- Foshan Graduate School of Innovation, Northeastern University, Foshan, Guangdong 528311, China
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2
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Mohamed SIGP, Namvar S, Zhang T, Shahbazi H, Jiang Z, Rappe AM, Salehi-Khojin A, Nejati S. Vapor-Phase Synthesis of Electrocatalytic Covalent Organic Frameworks. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2309302. [PMID: 38145558 DOI: 10.1002/adma.202309302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Revised: 12/14/2023] [Indexed: 12/27/2023]
Abstract
The inability to process many covalent organic frameworks (COFs) as thin films plagues their widespread utilization. Herein, a vapor-phase pathway for the bottom-up synthesis of a class of porphyrin-based COFs is presented. This approach allows integrating electrocatalysts made of metal-ion-containing COFs into the electrodes' architectures in a single-step synthesis and deposition. By precisely controlling the metal sites at the atomic level, remarkable electrocatalytic performance is achieved, resulting in unprecedentedly high mass activity values. How the choice of metal atoms, i.e., cobalt and copper, can determine the catalytic activities of POR-COFs is demonstrated. The theoretical data proves that the Cu site is highly active for nitrate conversion to ammonia on the synthesized COFs.
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Affiliation(s)
| | - Shahriar Namvar
- Department of Mechanical and Industrial Engineering University of Illinois at Chicago, Chicago, IL, 60607, USA
| | - Tan Zhang
- Department of Chemistry, University of Pennsylvania, Philadelphia, PA, 19104-6323, USA
| | - Hessam Shahbazi
- Department of Mechanical and Industrial Engineering University of Illinois at Chicago, Chicago, IL, 60607, USA
| | - Zhen Jiang
- Department of Chemistry, University of Pennsylvania, Philadelphia, PA, 19104-6323, USA
| | - Andrew M Rappe
- Department of Chemistry, University of Pennsylvania, Philadelphia, PA, 19104-6323, USA
| | - Amin Salehi-Khojin
- Department of Mechanical and Industrial Engineering University of Illinois at Chicago, Chicago, IL, 60607, USA
| | - Siamak Nejati
- Department of Chemical and Biomolecular Engineering, University of Nebraska Lincoln, Lincoln, NE, 68588-8286, USA
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3
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Millan R, Bello-Jurado E, Moliner M, Boronat M, Gomez-Bombarelli R. Effect of Framework Composition and NH 3 on the Diffusion of Cu + in Cu-CHA Catalysts Predicted by Machine-Learning Accelerated Molecular Dynamics. ACS CENTRAL SCIENCE 2023; 9:2044-2056. [PMID: 38033797 PMCID: PMC10683499 DOI: 10.1021/acscentsci.3c00870] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Indexed: 12/02/2023]
Abstract
Cu-exchanged zeolites rely on mobile solvated Cu+ cations for their catalytic activity, but the role of the framework composition in transport is not fully understood. Ab initio molecular dynamics simulations can provide quantitative atomistic insight but are too computationally expensive to explore large length and time scales or diverse compositions. We report a machine-learning interatomic potential that accurately reproduces ab initio results and effectively generalizes to allow multinanosecond simulations of large supercells and diverse chemical compositions. Biased and unbiased simulations of [Cu(NH3)2]+ mobility show that aluminum pairing in eight-membered rings accelerates local hopping and demonstrate that increased NH3 concentration enhances long-range diffusion. The probability of finding two [Cu(NH3)2]+ complexes in the same cage, which is key for SCR-NOx reaction, increases with Cu content and Al content but does not correlate with the long-range mobility of Cu+. Supporting experimental evidence was obtained from reactivity tests of Cu-CHA catalysts with a controlled chemical composition.
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Affiliation(s)
- Reisel Millan
- Department
of Materials Science and Engineering, Massachusetts
Institute of Technology, Cambridge, Massachusetts 02139, United States
- Instituto
de Tecnología Química, Universitat
Politècnica de València-Consejo Superior de Investigaciones
Científicas, Avenida de los Naranjos s/n, 46022 Valencia, Spain
| | - Estefanía Bello-Jurado
- Instituto
de Tecnología Química, Universitat
Politècnica de València-Consejo Superior de Investigaciones
Científicas, Avenida de los Naranjos s/n, 46022 Valencia, Spain
| | - Manuel Moliner
- Instituto
de Tecnología Química, Universitat
Politècnica de València-Consejo Superior de Investigaciones
Científicas, Avenida de los Naranjos s/n, 46022 Valencia, Spain
| | - Mercedes Boronat
- Instituto
de Tecnología Química, Universitat
Politècnica de València-Consejo Superior de Investigaciones
Científicas, Avenida de los Naranjos s/n, 46022 Valencia, Spain
| | - Rafael Gomez-Bombarelli
- Department
of Materials Science and Engineering, Massachusetts
Institute of Technology, Cambridge, Massachusetts 02139, United States
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4
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Chen D, Khetan A, Lei H, Rizzotto V, Yang JY, Jiang J, Sun Q, Peng B, Chen P, Palkovits R, Ye D, Simon U. Copper Site Motion Promotes Catalytic NO x Reduction under Zeolite Confinement. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:16121-16130. [PMID: 37842921 DOI: 10.1021/acs.est.3c03422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2023]
Abstract
Ammonia-mediated selective catalytic reduction (NH3-SCR) is currently the key approach to abate nitrogen oxides (NOx) emitted from heavy-duty lean-burn vehicles. The state-of-art NH3-SCR catalysts, namely, copper ion-exchanged chabazite (Cu-CHA) zeolites, perform rather poorly at low temperatures (below 200 °C) and are thus incapable of eliminating effectively NOx emissions under cold-start conditions. Here, we demonstrate a significant promotion of low-temperature NOx reduction by reinforcing the dynamic motion of zeolite-confined Cu sites during NH3-SCR. Combining complex impedance-based in situ spectroscopy (IS) and extended density-functional tight-binding molecular dynamics simulation, we revealed an environment- and temperature-dependent nature of the dynamic Cu motion within the zeolite lattice. Further coupling in situ IS with infrared spectroscopy allows us to unravel the critical role of monovalent Cu in the overall Cu mobility at a molecular level. Based on these mechanistic understandings, we elicit a boost of NOx reduction below 200 °C by reinforcing the dynamic Cu motion in various Cu-zeolites (Cu-CHA, Cu-ZSM-5, Cu-Beta, etc.) via facile postsynthesis treatments, either in a reductive mixture at low temperatures (below 250 °C) or in a nonoxidative atmosphere at high temperatures (above 450 °C).
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Affiliation(s)
- Dongdong Chen
- National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China
| | - Abhishek Khetan
- Multiscale Modelling of Heterogeneous Catalysis in Energy Systems, RWTH Aachen University, Schinkelstrasse 8, 52062 Aachen, Germany
| | - Huarong Lei
- National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1a, 52074 Aachen Germany
| | - Valentina Rizzotto
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1a, 52074 Aachen Germany
| | - Jia-Yue Yang
- Optics & Thermal Radiation Research Center, Shandong University, 266237 Qingdao, China
| | - Jiuxing Jiang
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, 510275 Guangzhou, China
| | - Qiming Sun
- Innovation Center for Chemical Sciences, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 215123 Suzhou, China
| | - Baoxiang Peng
- Laboratory of Industrial Chemistry, Ruhr University Bochum, 44780 Bochum, Germany
| | - Peirong Chen
- National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China
| | - Regina Palkovits
- Chair of Heterogeneous Catalysis and Chemical Technology, RWTH Aachen University, Worringerweg 2, 52074 Aachen, Germany
| | - Daiqi Ye
- National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China
| | - Ulrich Simon
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1a, 52074 Aachen Germany
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5
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Song K, Guo K, Mao S, Ma D, Lv Y, He C, Wang H, Cheng Y, Shi JW. Insight into the Origin of Excellent SO 2 Tolerance and de-NO x Performance of quasi-Mn-BTC in the Low-Temperature Catalytic Reduction of Nitrogen Oxide. ACS Catal 2023. [DOI: 10.1021/acscatal.3c00106] [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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6
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Zhang C, Liu X, Jiang M, Wen Y, Zhang J, Qian G. A review on identification, quantification, and transformation of active species in SCR by EPR spectroscopy. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:28550-28562. [PMID: 36708481 DOI: 10.1007/s11356-023-25467-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Accepted: 01/17/2023] [Indexed: 06/18/2023]
Abstract
Electron paramagnetic resonance (EPR) is the only technique that provides direct detection of free radicals and samples that contain unpaired electrons. Thus, EPR had an important potential application in the field of selective catalytic reduction of nitrogen oxide (SCR). For the first time, this work reviewed recent developments of EPR in charactering SCR. First, qualitative analysis focused on recognizing Cu, Fe, V, Ti, Mn, and free-radical (oxygen vacancy and superoxide radical) species. Second, quantification of the active species was obtained by a double-integral and calibration method. Third, the active species evolved because of different thermal treatments and redox-thermal processes under reductants (NH3 and NO). The coordination information of the active species in catalysts and their effects on SCR performances were concluded from mechanism viewpoints. Finally, potential perspectives were put forward for EPR developments in characterizing the SCR processes in the future. After all, EPR characterization will help to have a deep understanding of structure-activity relationship in one catalyst.
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Affiliation(s)
- Chenchen Zhang
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road., Shanghai, 200444, People's Republic of China
| | - Xinyu Liu
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road., Shanghai, 200444, People's Republic of China
| | - Meijia Jiang
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road., Shanghai, 200444, People's Republic of China
| | - Yuling Wen
- Shanghai SUS Environment Co., LTD, Shanghai, 201703, China
| | - Jia Zhang
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road., Shanghai, 200444, People's Republic of China.
| | - Guangren Qian
- MGI of Shanghai University, Xiapu Town, Xiangdong District, Pingxiang City, Jiangxi, 337022, People's Republic of China
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7
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Xie M, Xiao X, Wang J, Chen J, Kang H, Wang N, Chu W, Li L. Mechanistic insights into the cobalt promotion on low-temperature NH3-SCR reactivity of Cu/SSZ-13. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2023.123617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
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8
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Nasello ND, Usberti N, Iacobone U, Gramigni F, Hu W, Liu S, Nova I, Gao X, Tronconi E. Dual-Site RHC and OHC Transient Kinetics Predict Low-T Standard SCR Steady-State Rates over a Cu-CHA Catalyst. ACS Catal 2023. [DOI: 10.1021/acscatal.2c06071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Affiliation(s)
- Nicole Daniela Nasello
- Laboratory of Catalysis and Catalytic Processes, Dipartimento di Energia, Politecnico di Milano, Via La Masa 34, 20156Milano, Italy
| | - Nicola Usberti
- Laboratory of Catalysis and Catalytic Processes, Dipartimento di Energia, Politecnico di Milano, Via La Masa 34, 20156Milano, Italy
| | - Umberto Iacobone
- Laboratory of Catalysis and Catalytic Processes, Dipartimento di Energia, Politecnico di Milano, Via La Masa 34, 20156Milano, Italy
| | - Federica Gramigni
- Laboratory of Catalysis and Catalytic Processes, Dipartimento di Energia, Politecnico di Milano, Via La Masa 34, 20156Milano, Italy
| | - Wenshuo Hu
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, 310027Hangzhou, China
| | - Shaojun Liu
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, 310027Hangzhou, China
| | - Isabella Nova
- Laboratory of Catalysis and Catalytic Processes, Dipartimento di Energia, Politecnico di Milano, Via La Masa 34, 20156Milano, Italy
| | - Xiang Gao
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, 310027Hangzhou, China
| | - Enrico Tronconi
- Laboratory of Catalysis and Catalytic Processes, Dipartimento di Energia, Politecnico di Milano, Via La Masa 34, 20156Milano, Italy
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9
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Abdul Nasir J, Guan J, Keal TW, Desmoutier AW, Lu Y, Beale AM, Catlow CRA, Sokol AA. Influence of Solvent on Selective Catalytic Reduction of Nitrogen Oxides with Ammonia over Cu-CHA Zeolite. J Am Chem Soc 2022; 145:247-259. [PMID: 36548055 PMCID: PMC9837844 DOI: 10.1021/jacs.2c09823] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The copper-exchanged zeolite Cu-CHA has received considerable attention in recent years, owing to its application in the selective catalytic reduction (SCR) of NOx species. Here, we study the NH3-SCR reaction mechanism on Cu-CHA using the hybrid quantum mechanical/molecular mechanical (QM/MM) technique and investigate the effects of solvent on the reactivity of active Cu species. To this end, a comparison is made between water- and ammonia-solvated and bare Cu species. The results show the promoting effect of solvent on the oxidation component of the NH3-SCR cycle since the formation of important nitrate species is found to be energetically more favorable on the solvated Cu sites than in the absence of solvent molecules. Conversely, both solvent molecules are predicted to inhibit the reduction component of the NH3-SCR cycle. Diffuse reflectance infrared fourier-transform spectroscopy (DRIFTS) experiments exploiting (concentration) modulation excitation spectroscopy (MES) and phase-sensitive detection (PSD) identified spectroscopic signatures of Cu-nitrate and Cu-nitrosamine (H2NNO), important species which had not been previously observed experimentally. This is further supported by the QM/MM-calculated harmonic vibrational analysis. Additional insights are provided into the reactivity of solvated active sites and the formation of key intermediates including their formation energies and vibrational spectroscopic signatures, allowing the development of a detailed understanding of the reaction mechanism. We demonstrate the role of solvated active sites and their influence on the energetics of important species that must be explicitly considered for an accurate understanding of NH3-SCR kinetics.
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Affiliation(s)
- Jamal Abdul Nasir
- Department
of Chemistry, Kathleen Lonsdale Materials Chemistry, University College London, 20 Gordon Street, LondonWC1H 0AJ, U.K.,
| | - Jingcheng Guan
- Department
of Chemistry, Kathleen Lonsdale Materials Chemistry, University College London, 20 Gordon Street, LondonWC1H 0AJ, U.K.
| | - Thomas W. Keal
- Scientific
Computing Department, STFC Daresbury Laboratory, Keckwick Lane, Daresbury, WarringtonWA4 4AD, U.K.
| | - Alec W. Desmoutier
- Department
of Chemistry, Kathleen Lonsdale Materials Chemistry, University College London, 20 Gordon Street, LondonWC1H 0AJ, U.K.
| | - You Lu
- Scientific
Computing Department, STFC Daresbury Laboratory, Keckwick Lane, Daresbury, WarringtonWA4 4AD, U.K.
| | - Andrew M. Beale
- Department
of Chemistry, Christopher Ingold Building, University College London, 20 Gordon Street, LondonWC1H 0AJ, U.K.,UK
Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Laboratory, R92 Harwell, OxfordshireOX11 0FA, U.K.
| | - C. Richard A. Catlow
- Department
of Chemistry, Kathleen Lonsdale Materials Chemistry, University College London, 20 Gordon Street, LondonWC1H 0AJ, U.K.,UK
Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Laboratory, R92 Harwell, OxfordshireOX11 0FA, U.K.,School
of Chemistry, Cardiff University, Park Place, CardiffCF10 3AT, U.K.,
| | - Alexey A. Sokol
- Department
of Chemistry, Kathleen Lonsdale Materials Chemistry, University College London, 20 Gordon Street, LondonWC1H 0AJ, U.K.,
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10
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Wang B, Song K, Li Z, Li K, Shi JW. One-pot synthesis of rare earth modified Cu/SAPO-34 for enhanced selective catalytic reduction denitration performance. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/07/2022]
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11
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Ismail TM, Prasanthkumar KP, Ebenezer C, Anjali BA, Solomon RV, Sajith PK. Hydrogen-Bond-Assisted Adsorption of Nitric Oxide on Various Metal-Loaded ZSM-5 Zeolites. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:10492-10502. [PMID: 35969660 DOI: 10.1021/acs.langmuir.2c01270] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Understanding the characteristics of nitric oxide (NO) adsorption on metal-loaded zeolites is a prerequisite for developing efficient catalysts for NO abatement reactions. In this study, we probed the effect of the hydrogen bond that exists between adsorbed NO and Brønsted acid sites (BAS) in various metal-loaded ZSM-5 zeolites (M-ZSM-5, wherein M = Fe, Co, Ni, Cu, Zn, Pd, Ag, and Au) by using density functional theory calculations. The presence of a hydrogen bond has altered the NO adsorption energies significantly; appreciable stabilization via hydrogen bonding is noted for NO complexes of Zn, Fe, and Co, and reasonable stabilization is obtained for Ni and Cu complexes, whereas an anomalous effect of a hydrogen bond is identified in Ag, Pd, and Au species. Moderate weakening of the N-O bond in all NO-adsorbed complexes primarily due to a hydrogen bond has been realized in terms of Mayer bond order and quantum theory of atoms in molecules topological analyses; N-O bond activation follows the order Ag < Pd < Au < Ni < Cu < Co < Fe < Zn. We obtained a good correlation between hydrogen bond distance and molecular electrostatic potential at the O atom (VO) of NO adsorbed on BAS-free M-ZSM-5; which suggests that VO can be considered as a key descriptor to infer the strength of a hydrogen bond between the adsorbed NO and M-ZSM-5 with BAS. Finally, the energy decomposition analysis in combination with natural orbitals for chemical valence has provided the qualitative aspects of electron back-donation from the metal to the antibonding molecular orbital of NO; this back-donation is quite impressive in hydrogen-bond-assisted NO adsorption. We expect that the findings of this study will open up the possibility of the design of BAS-containing metal-loaded zeolites for the catalytic mitigation of NO.
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Affiliation(s)
- Thufail M Ismail
- Department of Chemistry, Farook College, Kozhikode 673632, Kerala, India
| | - Kavanal P Prasanthkumar
- Post Graduate and Research Department of Chemistry, Maharaja's College, Ernakulam 682011, Kerala, India
| | - Cheriyan Ebenezer
- Department of Chemistry, Madras Christian College (Autonomous), (Affiliated to the University of Madras), Chennai 600059, India
| | - Bai Amutha Anjali
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117585, Singapore
| | - Rajadurai Vijay Solomon
- Department of Chemistry, Madras Christian College (Autonomous), (Affiliated to the University of Madras), Chennai 600059, India
| | - Pookkottu K Sajith
- Department of Chemistry, Farook College, Kozhikode 673632, Kerala, India
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12
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Jamalzadeh S, Aghamohammadi S, Niaei A, Erfan-Niya H. Molecular dynamics and Monte Carlo simulations of molecules through ZSM-5 nano-catalysts applied in SCR of NOx with ammonia: Effect of Cu heteroatom. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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13
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Wu Y, Ma Y, Wang Y, Rappé KG, Washton NM, Wang Y, Walter ED, Gao F. Rate Controlling in Low-Temperature Standard NH 3-SCR: Implications from Operando EPR Spectroscopy and Reaction Kinetics. J Am Chem Soc 2022; 144:9734-9746. [PMID: 35605129 DOI: 10.1021/jacs.2c01933] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A series of seven Cu/SSZ-13 catalysts with Si/Al = 6.7 are used to elucidate key rate-controlling factors during low-temperature standard ammonia-selective catalytic reduction (NH3-SCR), via a combination of SCR kinetics and operando electron paramagnetic resonance (EPR) spectroscopy. Strong Cu-loading-dependent kinetics, with Cu atomic efficiency increasing nearly by an order of magnitude, is found when per chabazite cage occupancy for Cu ion increases from ∼0.04 to ∼0.3. This is due mainly to the release of intercage Cu transfer constraints that facilitates the redox chemistry, as evidenced from detailed Arrhenius analysis. Operando EPR spectroscopy studies reveal strong connectivity between Cu-ion dynamics and SCR kinetics, based on which it is concluded that under low-temperature steady-state SCR, kinetically most relevant Cu species are those with the highest intercage mobility. Transient binuclear Cu species are mechanistically relevant species, but their splitting and cohabitation are indispensable for low-temperature kinetics.
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Affiliation(s)
- Yiqing Wu
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99354, United States
| | - Yue Ma
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99354, United States
| | - Yilin Wang
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99354, United States
| | - Kenneth G Rappé
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99354, United States
| | - Nancy M Washton
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99354, United States
| | - Yong Wang
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99354, United States.,Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, Washington 99163, United States
| | - Eric D Walter
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99354, United States
| | - Feng Gao
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99354, United States
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14
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Ye X, Oord R, Monai M, Schmidt JE, Chen T, Meirer F, Weckhuysen BM. New insights into the NH 3-selective catalytic reduction of NO over Cu-ZSM-5 as revealed by operando spectroscopy. Catal Sci Technol 2022; 12:2589-2603. [PMID: 35664830 PMCID: PMC9016411 DOI: 10.1039/d1cy02348a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Accepted: 02/28/2022] [Indexed: 11/21/2022]
Abstract
To control diesel vehicle NO x emissions, Cu-exchanged zeolites have been applied in the selective catalytic reduction (SCR) of NO using NH3 as reductant. However, the harsh hydrothermal environment of tailpipe conditions causes irreversible catalyst deactivation. The aggregation of isolated Cu2+ brings about unselective ammonia oxidation along with the main NH3-SCR reaction. An unusual 'dip' shaped NO conversion curve was observed in the steamed zeolite Cu-ZSM-5, resulting from the undesired NH3 oxidation that produced NO. Here we gain further insights into the NH3-SCR reaction and its deactivation by employing operando UV-vis diffuse reflectance spectroscopy (DRS) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) on fresh and steamed zeolite Cu-ZSM-5. We found that tetragonally distorted octahedral Cu2+ with associated NH3 preferentially forms during low temperature NH3-SCR (<250 °C) in fresh Cu-ZSM-5. The high coordination number of Cu2+ ensures the availability for high coverage of nitrate intermediates. Whilst in the steamed Cu-ZSM-5, [Cu x (OH)2x-1]+ oligomers/clusters in pseudo-tetrahedral symmetry with coordinated NH3 accumulated during the low-temperature NH3-SCR reaction. These clusters presented a strong adsorption of surface NH3 and nitrates/nitric acid at low temperatures and therefore limited the reaction between surface species in the steamed Cu-ZSM-5. Further release of NH3 with increased reaction temperature favors NH3 oxidation that causes the drop of NO conversion at ∼275 °C. Moreover, competitive adsorption of NH3 and nitrates/nitric acid occurs on shared Lewis-acidic adsorption sites. Prompt removal of surface nitrates/nitric acid by NO avoids the surface blockage and tunes the selectivity by alternating nitrate-nitrite equilibrium. The formation of adsorbed NO2 and HNO x points to the necessity of an acid adsorbent in practical applications. The structural similarity under the NH3-SCR reaction and unselective NH3 oxidation confirmed the entanglement of these two reactions above 250 °C.
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Affiliation(s)
- Xinwei Ye
- Institute of New Catalytic Materials Science, School of Materials Science and Engineering, Key Laboratory of Advanced Energy Materials Chemistry (MOE), Nankai University Tianjin 300350 China.,Inorganic Chemistry and Catalysis Group, Debye Institute for Nanomaterials Science, Utrecht University Universiteitsweg 99 3584 CG Utrecht The Netherlands
| | - Ramon Oord
- Inorganic Chemistry and Catalysis Group, Debye Institute for Nanomaterials Science, Utrecht University Universiteitsweg 99 3584 CG Utrecht The Netherlands
| | - Matteo Monai
- Inorganic Chemistry and Catalysis Group, Debye Institute for Nanomaterials Science, Utrecht University Universiteitsweg 99 3584 CG Utrecht The Netherlands
| | - Joel E Schmidt
- Inorganic Chemistry and Catalysis Group, Debye Institute for Nanomaterials Science, Utrecht University Universiteitsweg 99 3584 CG Utrecht The Netherlands
| | - Tiehong Chen
- Institute of New Catalytic Materials Science, School of Materials Science and Engineering, Key Laboratory of Advanced Energy Materials Chemistry (MOE), Nankai University Tianjin 300350 China
| | - Florian Meirer
- Inorganic Chemistry and Catalysis Group, Debye Institute for Nanomaterials Science, Utrecht University Universiteitsweg 99 3584 CG Utrecht The Netherlands
| | - Bert M Weckhuysen
- Inorganic Chemistry and Catalysis Group, Debye Institute for Nanomaterials Science, Utrecht University Universiteitsweg 99 3584 CG Utrecht The Netherlands
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15
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Zhang Y, Zhu H, Zhang T, Li J, Chen J, Peng Y, Li J. Revealing the Synergistic Deactivation Mechanism of Hydrothermal Aging and SO 2 Poisoning on Cu/SSZ-13 under SCR Condition. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:1917-1926. [PMID: 34856804 DOI: 10.1021/acs.est.1c06068] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
In real-world application, Cu/SSZ-13 simultaneously suffers severe deactivation from hydrothermal aging and SO2 poisoning during the periodic regeneration of diesel particulate filter (DPF). Herein, we first investigated the synergistic deactivation mechanism of hydrothermal aging and SO2 poisoning on Cu/SSZ-13 under SCR condition. Hydrothermal aging alone induces more severe degradation of selective catalytic reduction (SCR) performance than SO2 poisoning alone, while the presence of SO2 during hydrothermal aging causes further worse SCR performance compared with hydrothermal aging alone. Hydrothermal aging not only damages Si-OH-Al sites, particularly in four-membered ring (4MR) of the CHA cage, but also brings the conversion of ZCuOH, leading to the formation of inactive CuO/CuAlOx species. By contrast, SO2 poisoning alone is more prone to promote the transformation of ZCuOH to Z2Cu. Synergistic deactivation of hydrothermal aging and SO2 poisoning would exacerbate the damage of Si-OH-Al sites and then the formation of CuO/CuAlOx species. These results are expected to assist the knowledge-based catalyst design for diesel aftertreatment applications.
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Affiliation(s)
- Yani Zhang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Hongchang Zhu
- School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
| | - Tao Zhang
- School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
| | - Jie Li
- School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
| | - Jianjun Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Yue Peng
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Junhua Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
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16
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Millan R, Cnudde P, van Speybroeck V, Boronat M. Mobility and Reactivity of Cu + Species in Cu-CHA Catalysts under NH 3-SCR-NOx Reaction Conditions: Insights from AIMD Simulations. JACS AU 2021; 1:1778-1787. [PMID: 34723280 PMCID: PMC8549050 DOI: 10.1021/jacsau.1c00337] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Indexed: 05/25/2023]
Abstract
The mobility of the copper cations acting as active sites for the selective catalytic reduction of nitrogen oxides with ammonia in Cu-CHA catalysts varies with temperature and feed composition. Herein, the migration of [Cu(NH3)2]+ complexes between two adjacent cavities of the chabazite structure, including other reactant molecules (NO, O2, H2O, and NH3), in the initial and final cavities is investigated using ab initio molecular dynamics (AIMD) simulations combined with enhanced sampling techniques to describe hopping events from one cage to the other. We find that such diffusion is only significantly hindered by the presence of excess NH3 or NO in the initial cavity, since both reactants form with [Cu(NH3)2]+ stable intermediates which are too bulky to cross the 8-ring windows connecting the cavities. The presence of O2 modifies strongly the interaction of NO with Cu+. At low temperatures, we observe NO detachment from Cu+ and increased mobility of the [Cu(NH3)2]+ complex, while at high temperatures, NO reacts spontaneously with O2 to form NO2. The present simulations give evidence for recent experimental observations, namely, an NH3 inhibition effect on the SCR reaction at low temperatures, and transport limitations of NO and NH3 at high temperatures. Our first principle simulations mimicking operating conditions support the existence of two different reaction mechanisms operating at low and high temperatures, the former involving dimeric Cu(NH3)2-O2-Cu(NH3)2 species and the latter occurring by direct NO oxidation to NO2 in one single cavity.
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Affiliation(s)
- Reisel Millan
- Instituto
de Tecnología Química, Universitat
Politècnica de València-Consejo Superior de Investigaciones
Científicas, Avenida de los Naranjos s/n, 46022 València, Spain
| | - Pieter Cnudde
- Center
for Molecular Modeling, Ghent University, Technologiepark 46, 9052 Zwijnaarde, Belgium
| | | | - Mercedes Boronat
- Instituto
de Tecnología Química, Universitat
Politècnica de València-Consejo Superior de Investigaciones
Científicas, Avenida de los Naranjos s/n, 46022 València, Spain
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17
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Negri C, Martini A, Deplano G, Lomachenko KA, Janssens TVW, Borfecchia E, Berlier G, Bordiga S. Investigating the role of Cu-oxo species in Cu-nitrate formation over Cu-CHA catalysts. Phys Chem Chem Phys 2021; 23:18322-18337. [PMID: 34612374 PMCID: PMC8409503 DOI: 10.1039/d1cp01754c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Accepted: 07/16/2021] [Indexed: 12/04/2022]
Abstract
The speciation of framework-interacting CuII sites in Cu-chabazite zeolite catalysts active in the selective catalytic reduction of NOx with NH3 is studied, to investigate the influence of the Al content on the copper structure and their reactivity towards a NO/O2 mixture. To this aim, three samples with similar Cu densities and different Si/Al ratios (5, 15 and 29) were studied using in situ X-ray absorption spectroscopy (XAS), FTIR and diffuse reflectance UV-Vis during pretreatment in O2 followed by the reaction. XAS and UV-Vis data clearly show the main presence of Z2CuII sites (with Z representing a framework negative charge) at a low Si/Al ratio, as predicted. EXAFS wavelet transform analysis showed a non-negligible fraction of proximal Z2CuII monomers, possibly stabilized into two 6-membered rings within the same cage. These sites are not able to form Cu-nitrates by interaction with NO/O2. By contrast, framework-anchored Z[CuII(NO3)] complexes with a chelating bidentate structure are formed in samples with a higher Si/Al ratio, by reaction of NO/O2 with Z[CuII(OH)] sites or structurally similar mono- or multi-copper Zx[CuIIxOy] sites. Linear combination fit (LCF) analysis of the XAS data showed good agreement between the fraction of Z[CuII(OH)]/Zx[CuIIxOy] sites formed during activation in O2 and that of Z[CuII(NO3)] complexes formed by reaction with NO/O2, further confirming the chemical inertia of Z2CuII towards these reactants in the absence of solvating NH3 molecules.
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Affiliation(s)
- Chiara Negri
- Department of Chemistry and NIS Centre, University of TurinVia Giuria 7Turin10125 (I)Italy
| | - Andrea Martini
- Department of Chemistry and NIS Centre, University of TurinVia Giuria 7Turin10125 (I)Italy
- The Smart Materials Research Institute, Southern Federal UniversitySladkova 178/24344090 Rostov-on-DonRussia
| | - Gabriele Deplano
- Department of Chemistry and NIS Centre, University of TurinVia Giuria 7Turin10125 (I)Italy
| | - Kirill A. Lomachenko
- European Synchrotron Radiation Facility71 Avenue des Martyrs, CS 4022038043 Grenoble Cedex 9France
| | | | - Elisa Borfecchia
- Department of Chemistry and NIS Centre, University of TurinVia Giuria 7Turin10125 (I)Italy
| | - Gloria Berlier
- Department of Chemistry and NIS Centre, University of TurinVia Giuria 7Turin10125 (I)Italy
| | - Silvia Bordiga
- Department of Chemistry and NIS Centre, University of TurinVia Giuria 7Turin10125 (I)Italy
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18
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Wang B, Yu H, Wang M, Han L, Wang J, Bao W, Chang L. Microwave synthesis conditions dependent catalytic performance of hydrothermally aged CuII-SSZ-13 for NH3-SCR of NO. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.10.023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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19
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Ma Y, Han X, Xu S, Wang Z, Li W, da Silva I, Chansai S, Lee D, Zou Y, Nikiel M, Manuel P, Sheveleva AM, Tuna F, McInnes EJL, Cheng Y, Rudić S, Ramirez-Cuesta AJ, Haigh SJ, Hardacre C, Schröder M, Yang S. Atomically Dispersed Copper Sites in a Metal-Organic Framework for Reduction of Nitrogen Dioxide. J Am Chem Soc 2021; 143:10977-10985. [PMID: 34279096 PMCID: PMC8323097 DOI: 10.1021/jacs.1c03036] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
Metal–organic
framework (MOF) materials provide an excellent
platform to fabricate single-atom catalysts due to their structural
diversity, intrinsic porosity, and designable functionality. However,
the unambiguous identification of atomically dispersed metal sites
and the elucidation of their role in catalysis are challenging due
to limited methods of characterization and lack of direct structural
information. Here, we report a comprehensive investigation of the
structure and the role of atomically dispersed copper sites in UiO-66
for the catalytic reduction of NO2 at ambient temperature.
The atomic dispersion of copper sites on UiO-66 is confirmed by high-angle
annular dark-field scanning transmission electron microscopy, electron
paramagnetic resonance spectroscopy, and inelastic neutron scattering,
and their location is identified by neutron powder diffraction and
solid-state nuclear magnetic resonance spectroscopy. The Cu/UiO-66
catalyst exhibits superior catalytic performance for the reduction
of NO2 at 25 °C without the use of reductants. A selectivity
of 88% for the formation of N2 at a 97% conversion of NO2 with a lifetime of >50 h and an unprecedented turnover
frequency
of 6.1 h–1 is achieved under nonthermal plasma activation. In situ and operando infrared, solid-state
NMR, and EPR spectroscopy reveal the critical role of copper sites
in the adsorption and activation of NO2 molecules, with
the formation of {Cu(I)···NO} and {Cu···NO2} adducts promoting the conversion of NO2 to N2. This study will inspire the further design and study of
new efficient single-atom catalysts for NO2 abatement via detailed unravelling of their role in catalysis.
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Affiliation(s)
- Yujie Ma
- Department of Chemistry, University of Manchester, Manchester M13 9PL, United Kingdom
| | - Xue Han
- Department of Chemistry, University of Manchester, Manchester M13 9PL, United Kingdom
| | - Shaojun Xu
- Department of Chemistry, University of Manchester, Manchester M13 9PL, United Kingdom.,UK Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell OX11 0FA, United Kingdom.,School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, United Kingdom
| | - Zi Wang
- Department of Chemistry, University of Manchester, Manchester M13 9PL, United Kingdom
| | - Weiyao Li
- Department of Chemistry, University of Manchester, Manchester M13 9PL, United Kingdom
| | - Ivan da Silva
- ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, United Kingdom
| | - Sarayute Chansai
- Department of Chemical Engineering and Analytical Science, University of Manchester, Manchester M13 9PL, United Kingdom
| | - Daniel Lee
- Department of Chemical Engineering and Analytical Science, University of Manchester, Manchester M13 9PL, United Kingdom
| | - Yichao Zou
- Department of Materials, University of Manchester, Manchester M13 9PL, United Kingdom
| | - Marek Nikiel
- Department of Materials, University of Manchester, Manchester M13 9PL, United Kingdom
| | - Pascal Manuel
- ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, United Kingdom
| | - Alena M Sheveleva
- Department of Chemistry, University of Manchester, Manchester M13 9PL, United Kingdom.,Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Floriana Tuna
- Department of Chemistry, University of Manchester, Manchester M13 9PL, United Kingdom.,Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Eric J L McInnes
- Department of Chemistry, University of Manchester, Manchester M13 9PL, United Kingdom.,Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Yongqiang Cheng
- Neutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Svemir Rudić
- ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, United Kingdom
| | - Anibal J Ramirez-Cuesta
- Neutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Sarah J Haigh
- Department of Materials, University of Manchester, Manchester M13 9PL, United Kingdom
| | - Christopher Hardacre
- Department of Chemical Engineering and Analytical Science, University of Manchester, Manchester M13 9PL, United Kingdom
| | - Martin Schröder
- Department of Chemistry, University of Manchester, Manchester M13 9PL, United Kingdom
| | - Sihai Yang
- Department of Chemistry, University of Manchester, Manchester M13 9PL, United Kingdom
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20
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Guan B, Jiang H, Wei Y, Liu Z, Wu X, Lin H, Huang Z. Density functional theory researches for atomic structure, properties prediction, and rational design of selective catalytic reduction catalysts: Current progresses and future perspectives. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2021.111704] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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21
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Mounssef Jr B, de Alcântara Morais SF, de Lima Batista AP, de Lima LW, Braga AAC. DFT study of H 2 adsorption at a Cu-SSZ-13 zeolite: a cluster approach. Phys Chem Chem Phys 2021; 23:9980-9990. [PMID: 33870397 DOI: 10.1039/d1cp00422k] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work the H2 adsorption at a Cu(i)-SSZ-13 exchanged zeolite was theoretically investigated. A systematic cluster approach was used and different density functionals (B3LYP, B3LYP-D3(BJ), M06L, PBE, PBE-D3(BJ) and ωB97XD) and a def2-SVP basis set were benchmarked. In order to select the best approach to the H2 adsorption over a Cu(i)-SSZ-13 cluster with 78 atoms (16 T-sites), two main tasks were performed: (1) a comparison between theoretical and experimental structures and (2) a comparison between theoretical and experimental adsorption enthalpies. By employing the most suitable functional - the ωB97X-D - the H2 interaction with the zeolite structure was studied by means of NBO, NCI, AIM and DLPNO-CCSD(T)/LED analyses.
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Affiliation(s)
- Bassim Mounssef Jr
- GQCA - Grupo de Química Computacional Aplicada, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 748, São Paulo, 05508-000, Brazil.
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22
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Gramigni F, Nasello ND, Usberti N, Iacobone U, Selleri T, Hu W, Liu S, Gao X, Nova I, Tronconi E. Transient Kinetic Analysis of Low-Temperature NH 3-SCR over Cu-CHA Catalysts Reveals a Quadratic Dependence of Cu Reduction Rates on Cu II. ACS Catal 2021. [DOI: 10.1021/acscatal.0c05362] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Federica Gramigni
- Laboratory of Catalysis and Catalytic Processes, Dipartimento di Energia, Politecnico di Milano, Via La Masa 34, 20156 Milano, Italy
| | - Nicole Daniela Nasello
- Laboratory of Catalysis and Catalytic Processes, Dipartimento di Energia, Politecnico di Milano, Via La Masa 34, 20156 Milano, Italy
| | - Nicola Usberti
- Laboratory of Catalysis and Catalytic Processes, Dipartimento di Energia, Politecnico di Milano, Via La Masa 34, 20156 Milano, Italy
| | - Umberto Iacobone
- Laboratory of Catalysis and Catalytic Processes, Dipartimento di Energia, Politecnico di Milano, Via La Masa 34, 20156 Milano, Italy
| | - Tommaso Selleri
- Laboratory of Catalysis and Catalytic Processes, Dipartimento di Energia, Politecnico di Milano, Via La Masa 34, 20156 Milano, Italy
| | - Wenshuo Hu
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou 310027, P. R. China
| | - Shaojun Liu
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou 310027, P. R. China
| | - Xiang Gao
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou 310027, P. R. China
| | - Isabella Nova
- Laboratory of Catalysis and Catalytic Processes, Dipartimento di Energia, Politecnico di Milano, Via La Masa 34, 20156 Milano, Italy
| | - Enrico Tronconi
- Laboratory of Catalysis and Catalytic Processes, Dipartimento di Energia, Politecnico di Milano, Via La Masa 34, 20156 Milano, Italy
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23
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Si M, Shen B, Adwek G, Xiong L, Liu L, Yuan P, Gao H, Liang C, Guo Q. Review on the NO removal from flue gas by oxidation methods. J Environ Sci (China) 2021; 101:49-71. [PMID: 33334538 DOI: 10.1016/j.jes.2020.08.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 08/04/2020] [Accepted: 08/05/2020] [Indexed: 06/12/2023]
Abstract
Due to the increasingly strict emission standards of NOx on various industries, many traditional flue gas treatment methods have been gradually improved. Except for selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) methods to remove NOx from flue gas, theoxidation method is paying more attention to NOx removal now because of the potential to simultaneously remove multiple pollutants from flue gas. This paper summarizes the efficiency, reaction conditions, effect factors, and reaction mechanism of NO oxidation from the aspects of liquid-phase oxidation, gas-phase oxidation, plasma technology, and catalytic oxidation. The effects of free radicals and active components of catalysts on NO oxidation and the combination of various oxidation methods are discussed in detail. The advantages and disadvantages of different oxidation methods are summarized, and the suggestions for future research on NO oxidation are put forward at the end. The review on the NO removal by oxidation methods can provide new ideas for future studies on the NO removal from flue gas.
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Affiliation(s)
- Meng Si
- Tianjin Key Laboratory of Clean Energy and Pollutant Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin300401, China
| | - Boxiong Shen
- Tianjin Key Laboratory of Clean Energy and Pollutant Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin300401, China.
| | - George Adwek
- Tianjin Key Laboratory of Clean Energy and Pollutant Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin300401, China; Department of Energy and Environmental Engineering, Mount Kenya University, Thika, Kenya
| | - Lifu Xiong
- Tianjin Key Laboratory of Clean Energy and Pollutant Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin300401, China
| | - Lijun Liu
- Tianjin Key Laboratory of Clean Energy and Pollutant Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin300401, China
| | - Peng Yuan
- Tianjin Key Laboratory of Clean Energy and Pollutant Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin300401, China
| | - Hongpei Gao
- China Huaneng Group Clean Energy Technology Research Institute Co. Ltd., Beijing 102209, China
| | - Cai Liang
- Chengdu Dongfang KWH Environmental Protection Catalysts Co. Ltd., Chengdu 610042, China
| | - Qihai Guo
- TUS Environmental Science and Technology Development Co. Ltd., Yichang 443000, China
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24
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Zhu X, Dou L, Wu J, Yue Y, Zhang J, Qian G. Carbon deposition enhanced selective catalytic reduction of nitric oxide by a new catalytic process as well as increasing reducibility of catalyst. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 756:143834. [PMID: 33280880 DOI: 10.1016/j.scitotenv.2020.143834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 10/09/2020] [Accepted: 11/05/2020] [Indexed: 06/12/2023]
Abstract
Carbon deposition usually hinders catalytic activity in one catalysis. In this work, carbon-deposition influence was investigated on selective catalytic reduction (SCR) of nitric oxide (NO) by a theoretical-experimental method. Density-functional-theory calculations showed that carbon deposition increased adsorption energy of NO on oxide. For example, adsorption energy on Fe2O3 increased from 1.70 to 5.27 eV. Carbon deposition increased activity by following processes: NO adsorption, NO dissociation, oxygen transmittance, CO-group formation, and N2/CO2 evolutions. Among these stages, CO-group formation was a key step. Based on these computational predictions, an experimental SCR was carried out for the verification. As a result, a carbon-deposited catalyst had a better SCR activity (20% higher) than the corresponding oxide catalyst. Characterizations showed that carbon deposition increased the amounts of medium/strong acidic sites as well as the reducibility of the catalytic center. The main result of this article helps to understand the interface behavior of carbon on a catalyst during SCR. Above results are also in favor of designing a more effective SCR reactor to ensure a more stable running.
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Affiliation(s)
- Xiaolei Zhu
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai 200444, PR China
| | - Li Dou
- China National Heavy Duty Truck Group Co., Ltd, Sinotruk Tower, No. 777 Hua'ao Road, Innovation Zone, Jinan, Shandong Province 25010, PR China
| | - Jianzhong Wu
- MGI of Shanghai University, Xiapu Town, Xiangdong District, Pingxiang City, Jiangxi 337022, PR China.
| | - Yang Yue
- MGI of Shanghai University, Xiapu Town, Xiangdong District, Pingxiang City, Jiangxi 337022, PR China.
| | - Jia Zhang
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai 200444, PR China.
| | - Guangren Qian
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai 200444, PR China.
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25
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Wang Z, Li S, Zhang C, Wang D, Li X. The Opportunities and Challenges for NH3 Oxidation with 100% Conversion and Selectivity. CATALYSIS SURVEYS FROM ASIA 2021. [DOI: 10.1007/s10563-020-09320-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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26
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Zhao P, Boekfa B, Shimizu KI, Ogura M, Ehara M. Selective catalytic reduction of NO with NH 3 over Cu-exchanged CHA, GME, and AFX zeolites: a density functional theory study. Catal Sci Technol 2021. [DOI: 10.1039/d0cy02342f] [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
Density functional theory calculations have been applied to study the selectivity caused by the cage size during the selective catalytic reduction of NO by NH3 over the Cu-exchanged zeolites with cha, gme, and aft cages.
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Affiliation(s)
- Pei Zhao
- Research Center for Computational Science
- Institute for Molecular Science
- Okazaki
- Japan
- Element Strategy Initiative for Catalysts and Batteries (ESICB)
| | - Bundet Boekfa
- Department of Chemistry
- Faculty of Liberal Arts and Science
- Kasetsart University, Kamphaengsaen Campus
- Thailand
| | - Ken-ichi Shimizu
- Element Strategy Initiative for Catalysts and Batteries (ESICB)
- Kyoto University
- Kyoto 615-8245
- Japan
- Institute for Catalysis
| | - Masaru Ogura
- Element Strategy Initiative for Catalysts and Batteries (ESICB)
- Kyoto University
- Kyoto 615-8245
- Japan
- Institute of Industrial Science
| | - Masahiro Ehara
- Research Center for Computational Science
- Institute for Molecular Science
- Okazaki
- Japan
- Element Strategy Initiative for Catalysts and Batteries (ESICB)
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27
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Recent Understanding of Low-Temperature Copper Dynamics in Cu-Chabazite NH3-SCR Catalysts. Catalysts 2021. [DOI: 10.3390/catal11010052] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Dynamic motion of NH3-solvated Cu sites in Cu-chabazite (Cu-CHA) zeolites, which are the most promising and state-of-the-art catalysts for ammonia-assisted selective reduction of NOx (NH3-SCR) in the aftertreatment of diesel exhausts, represents a unique phenomenon linking heterogeneous and homogeneous catalysis. This review first summarizes recent advances in the theoretical understanding of such low-temperature Cu dynamics. Specifically, evidence of both intra-cage and inter-cage Cu motions, given by ab initio molecular dynamics (AIMD) or metadynamics simulations, will be highlighted. Then, we will show how, among others, synchrotron-based X-ray spectroscopy, vibrational and optical spectroscopy (diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) and diffuse reflection ultraviolet-visible spectroscopy (DRUVS)), electron paramagnetic spectroscopy (EPR), and impedance spectroscopy (IS) can be combined and complement each other to follow the evolution of coordinative environment and the local structure of Cu centers during low-temperature NH3-SCR reactions. Furthermore, the essential role of Cu dynamics in the tuning of low-temperature Cu redox, in the preparation of highly dispersed Cu-CHA catalysts by solid-state ion exchange method, and in the direct monitoring of NH3 storage and conversion will be presented. Based on the achieved mechanistic insights, we will discuss briefly the new perspectives in manipulating Cu dynamics to improve low-temperature NH3-SCR efficiency as well as in the understanding of other important reactions, such as selective methane-to-methanol oxidation and ethene dimerization, catalyzed by metal ion-exchanged zeolites.
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28
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Millan R, Cnudde P, Hoffman AEJ, Lopes CW, Concepción P, van Speybroeck V, Boronat M. Theoretical and Spectroscopic Evidence of the Dynamic Nature of Copper Active Sites in Cu-CHA Catalysts under Selective Catalytic Reduction (NH 3-SCR-NO x) Conditions. J Phys Chem Lett 2020; 11:10060-10066. [PMID: 33179925 PMCID: PMC7720274 DOI: 10.1021/acs.jpclett.0c03020] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
The dynamic nature of the copper cations acting as active sites for selective catalytic reduction of nitrogen oxides with ammonia is investigated using a combined theoretical and spectroscopic approach. Ab initio molecular dynamics simulations of Cu-CHA catalysts in contact with reactants and intermediates at realistic operating conditions show that only ammonia is able to release Cu+ and Cu2+ cations from their positions coordinated to the zeolite framework, forming mobile Cu+(NH3)2 and Cu2+(NH3)4 complexes that migrate to the center of the cavity. Herein, we give evidence that such mobilization of copper cations modifies the vibrational fingerprint in the 800-1000 cm-1 region of the IR spectra. Bands associated with the lattice asymmetric T-O-T vibrations are perturbed by the presence of coordinated cations, and allow one to experimentally follow the dynamic reorganization of the active sites at operating conditions.
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Affiliation(s)
- Reisel Millan
- Instituto
de Tecnología Química, Universitat Politècnica
de València-Consejo Superior de Investigaciones Científicas, Avenida de los Naranjos s/n, 46022 València, Spain
| | - Pieter Cnudde
- Center
for Molecular Modeling, Ghent University, Technologiepark 46, 9052 Zwijnaarde, Belgium
| | - Alexander E. J. Hoffman
- Center
for Molecular Modeling, Ghent University, Technologiepark 46, 9052 Zwijnaarde, Belgium
| | - Christian W. Lopes
- Laboratório
de Reatividade e Catálise (LRC), Universidade Federal do Rio Grande do Sul, Bento Gonçalves Avenue 9500, 91501-970 Porto Alegre, Brazil
| | - Patricia Concepción
- Instituto
de Tecnología Química, Universitat Politècnica
de València-Consejo Superior de Investigaciones Científicas, Avenida de los Naranjos s/n, 46022 València, Spain
| | | | - Mercedes Boronat
- Instituto
de Tecnología Química, Universitat Politècnica
de València-Consejo Superior de Investigaciones Científicas, Avenida de los Naranjos s/n, 46022 València, Spain
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29
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Ye X, Schmidt JE, Wang R, van Ravenhorst IK, Oord R, Chen T, de Groot F, Meirer F, Weckhuysen BM. Deactivation of Cu-Exchanged Automotive-Emission NH 3 -SCR Catalysts Elucidated with Nanoscale Resolution Using Scanning Transmission X-ray Microscopy. Angew Chem Int Ed Engl 2020; 59:15610-15617. [PMID: 32011783 PMCID: PMC7522683 DOI: 10.1002/anie.201916554] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Indexed: 11/06/2022]
Abstract
To gain insight into the underlying mechanisms of catalyst durability for the selective catalytic reduction (SCR) of NOx with an ammonia reductant, we employed scanning transmission X-ray microscopy (STXM) to study Cu-exchanged zeolites with the CHA and MFI framework structures before and after simulated 135 000-mile aging. X-ray absorption near-edge structure (XANES) measurements were performed at the Al K- and Cu L-edges. The local environment of framework Al, the oxidation state of Cu, and geometric changes were analyzed, showing a multi-factor-induced catalytic deactivation. In Cu-exchanged MFI, a transformation of CuII to CuI and Cux Oy was observed. We also found a spatial correlation between extra-framework Al and deactivated Cu species near the surface of the zeolite as well as a weak positive correlation between the amount of CuI and tri-coordinated Al. By inspecting both Al and Cu in fresh and aged Cu-exchanged zeolites, we conclude that the importance of the preservation of isolated CuII sites trumps that of Brønsted acid sites for NH3 -SCR activity.
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Affiliation(s)
- Xinwei Ye
- School of Materials Science and EngineeringKey Laboratory of Advanced Energy Materials Chemistry (MOE)Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)Nankai UniversityTianjin300350P. R. China
- Inorganic Chemistry and Catalysis GroupDebye Institute for Nanomaterials ScienceUtrecht UniversityUniversiteitsweg 993584CGUtrechtNetherlands
| | - Joel E. Schmidt
- Inorganic Chemistry and Catalysis GroupDebye Institute for Nanomaterials ScienceUtrecht UniversityUniversiteitsweg 993584CGUtrechtNetherlands
| | - Ru‐Pan Wang
- Inorganic Chemistry and Catalysis GroupDebye Institute for Nanomaterials ScienceUtrecht UniversityUniversiteitsweg 993584CGUtrechtNetherlands
| | - Ilse K. van Ravenhorst
- Inorganic Chemistry and Catalysis GroupDebye Institute for Nanomaterials ScienceUtrecht UniversityUniversiteitsweg 993584CGUtrechtNetherlands
| | - Ramon Oord
- Inorganic Chemistry and Catalysis GroupDebye Institute for Nanomaterials ScienceUtrecht UniversityUniversiteitsweg 993584CGUtrechtNetherlands
| | - Tiehong Chen
- School of Materials Science and EngineeringKey Laboratory of Advanced Energy Materials Chemistry (MOE)Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)Nankai UniversityTianjin300350P. R. China
| | - Frank de Groot
- Inorganic Chemistry and Catalysis GroupDebye Institute for Nanomaterials ScienceUtrecht UniversityUniversiteitsweg 993584CGUtrechtNetherlands
| | - Florian Meirer
- Inorganic Chemistry and Catalysis GroupDebye Institute for Nanomaterials ScienceUtrecht UniversityUniversiteitsweg 993584CGUtrechtNetherlands
| | - Bert M. Weckhuysen
- Inorganic Chemistry and Catalysis GroupDebye Institute for Nanomaterials ScienceUtrecht UniversityUniversiteitsweg 993584CGUtrechtNetherlands
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30
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Zhu B, Ehara M, Sakaki S. Propene oxidation catalysis and electronic structure of M 55 particles (M = Pd or Rh): differences and similarities between Pd 55 and Rh 55. Phys Chem Chem Phys 2020; 22:11783-11796. [PMID: 32215421 DOI: 10.1039/d0cp00169d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Propene oxidation is one of the important reactions that occurs in the presence of a three-way catalyst but its reaction mechanism is unclear. The reaction mechanisms and differences in catalysis between Pd and Rh particles were investigated by DFT calculations employing Pd55 and Rh55 as the model catalysts. The O-attack mechanism, in which the O atom adsorbed on the Pd55 and Rh55 surfaces attacks the C[double bond, length as m-dash]C double bond of propene, needs to overcome a large activation barrier (Ea). On the other hand, C-H bond cleavage of the methyl group of propene easily occurs with moderate Ea; the mechanism initiated by this C-H activation is named H-transfer mechanism. In this mechanism, the next step is allyl alcohol formation, followed by the second C-H bond activation of the CH2OH species of allyl alcohol, and the final step is proton transfer from OH-substituted π-allyl species to the OH group on the metal surface to yield acrolein and water molecules with the regeneration of M55. The rate-determining step is the second C-H bond activation. Its Ea is 17.4 kcal mol-1 for the reaction on Pd55 and 34.4 kcal mol-1 for the reaction on Rh55. These results indicate that Pd particles are more active than Rh particles in propene oxidation, which agrees with the experimental findings. The larger Ea for Rh55 than that for Pd55 arises from the stronger Rh-OH bond than the Pd-OH bond. The higher energy d-valence band-top of Rh55 than that of Pd55 is the origin of the stronger Rh-OH bond than the Pd-OH bond. Thus, the d-valence band-top energy is an important property for understanding and designing catalysts for alkene oxidation.
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Affiliation(s)
- Bo Zhu
- Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, 1-30 Goryo-Ohara, Nishikyo-ku, Kyoto 615-8245, Japan.
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31
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Xu R, Wang Z, Liu N, Dai C, Zhang J, Chen B. Understanding Zn Functions on Hydrothermal Stability in a One-Pot-Synthesized Cu&Zn-SSZ-13 Catalyst for NH3 Selective Catalytic Reduction. ACS Catal 2020. [DOI: 10.1021/acscatal.0c01063] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ruinian Xu
- College of Environment and Energy Engineering, Beijing University of Technology, Beijing 100124, China
| | - Ziyang Wang
- College of Environment and Energy Engineering, Beijing University of Technology, Beijing 100124, China
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Ning Liu
- College of Environment and Energy Engineering, Beijing University of Technology, Beijing 100124, China
| | - Chengna Dai
- College of Environment and Energy Engineering, Beijing University of Technology, Beijing 100124, China
| | - Jie Zhang
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Biaohua Chen
- College of Environment and Energy Engineering, Beijing University of Technology, Beijing 100124, China
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32
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Pétaud G, Gaillard F, Tayakout M, Gil S, Giroir‐Fendler A. Spotlight on Large Surface Copper Cluster Role of Cu‐SAPO‐34 Catalyst in Standard NH
3
‐SCR Performances. ChemCatChem 2020. [DOI: 10.1002/cctc.201902036] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Guillaume Pétaud
- Université de Lyon, Université Claude Bernard Lyon 1 IRCELYON, CNRS, UMR 5256 2 avenue Albert Einstein Villeurbanne F-69622 France
| | - François Gaillard
- Université de Lyon, Université Claude Bernard Lyon 1 IRCELYON, CNRS, UMR 5256 2 avenue Albert Einstein Villeurbanne F-69622 France
| | - Melaz Tayakout
- Université de Lyon, Université Claude Bernard Lyon 1 LAGEPP, CNRS, UMR 5007 43 Bd du 11 Novembre 1918 Villeurbanne F-69622 France
| | - Sonia Gil
- Université de Lyon, Université Claude Bernard Lyon 1 IRCELYON, CNRS, UMR 5256 2 avenue Albert Einstein Villeurbanne F-69622 France
| | - Anne Giroir‐Fendler
- Université de Lyon, Université Claude Bernard Lyon 1 IRCELYON, CNRS, UMR 5256 2 avenue Albert Einstein Villeurbanne F-69622 France
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33
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Wang Y, Ji X, Meng H, Qu L, Wu X. Fabrication of high-silica Cu/ZSM-5 with confinement encapsulated Cu-based active species for NH3-SCR. CATAL COMMUN 2020. [DOI: 10.1016/j.catcom.2020.105969] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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34
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Ye X, Schmidt JE, Wang R, Ravenhorst IK, Oord R, Chen T, Groot F, Meirer F, Weckhuysen BM. Deactivation of Cu‐Exchanged Automotive‐Emission NH
3
‐SCR Catalysts Elucidated with Nanoscale Resolution Using Scanning Transmission X‐ray Microscopy. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201916554] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Xinwei Ye
- School of Materials Science and Engineering Key Laboratory of Advanced Energy Materials Chemistry (MOE) Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Nankai University Tianjin 300350 P. R. China
- Inorganic Chemistry and Catalysis Group Debye Institute for Nanomaterials Science Utrecht University Universiteitsweg 99 3584 CG Utrecht Netherlands
| | - Joel E. Schmidt
- Inorganic Chemistry and Catalysis Group Debye Institute for Nanomaterials Science Utrecht University Universiteitsweg 99 3584 CG Utrecht Netherlands
| | - Ru‐Pan Wang
- Inorganic Chemistry and Catalysis Group Debye Institute for Nanomaterials Science Utrecht University Universiteitsweg 99 3584 CG Utrecht Netherlands
| | - Ilse K. Ravenhorst
- Inorganic Chemistry and Catalysis Group Debye Institute for Nanomaterials Science Utrecht University Universiteitsweg 99 3584 CG Utrecht Netherlands
| | - Ramon Oord
- Inorganic Chemistry and Catalysis Group Debye Institute for Nanomaterials Science Utrecht University Universiteitsweg 99 3584 CG Utrecht Netherlands
| | - Tiehong Chen
- School of Materials Science and Engineering Key Laboratory of Advanced Energy Materials Chemistry (MOE) Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Nankai University Tianjin 300350 P. R. China
| | - Frank Groot
- Inorganic Chemistry and Catalysis Group Debye Institute for Nanomaterials Science Utrecht University Universiteitsweg 99 3584 CG Utrecht Netherlands
| | - Florian Meirer
- Inorganic Chemistry and Catalysis Group Debye Institute for Nanomaterials Science Utrecht University Universiteitsweg 99 3584 CG Utrecht Netherlands
| | - Bert M. Weckhuysen
- Inorganic Chemistry and Catalysis Group Debye Institute for Nanomaterials Science Utrecht University Universiteitsweg 99 3584 CG Utrecht Netherlands
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35
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Wan Y, Yang G, Xiang J, Shen X, Yang D, Chen Y, Rac V, Rakic V, Du X. Promoting effects of water on the NH 3-SCR reaction over Cu-SAPO-34 catalysts: transient and permanent influences on Cu species. Dalton Trans 2020; 49:764-773. [PMID: 31850452 DOI: 10.1039/c9dt03848e] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Cu-SAPO-34 catalysts with varied Cu loadings were synthesized through ion exchange to study the influence of water on the NH3-SCR reaction. The catalytic activities were evaluated by selective catalytic reduction of NO under a reactant feed in the presence/absence of water. Transient experiments were designed to study the response of NO conversion to the presence of water. H2-TPR and DFT calculations were performed to study the reducibility of Cu species. NH3-TPD and XPS were conducted to reveal the migration of Cu species. The results show that water could remarkably improve NO reduction activities and the promoting effect is more significant on the catalyst with low Cu loading. Both transient and permanent influences were found in this promoting phenomenon. For the transient influence, water has been proved to accelerate the re-oxidation half-cycle. Moreover, water can enhance the promoting effect of the SCR feed on the migration of Cu species. These unanchored Cu ions migrate to defect sites to form active sites, which lead to a permanent influence of water.
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Affiliation(s)
- Yuyi Wan
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, School of Energy and Power Engineering, Chongqing University, Chongqing, 400044, China.
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36
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Greenaway AG, Marberger A, Thetford A, Lezcano-González I, Agote-Arán M, Nachtegaal M, Ferri D, Kröcher O, Catlow CRA, Beale AM. Detection of key transient Cu intermediates in SSZ-13 during NH 3-SCR deNO x by modulation excitation IR spectroscopy. Chem Sci 2020; 11:447-455. [PMID: 32190265 PMCID: PMC7067242 DOI: 10.1039/c9sc04905c] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2019] [Accepted: 11/15/2019] [Indexed: 01/14/2023] Open
Abstract
The small pore zeolite Cu-SSZ-13 is an efficient material for the standard selective catalytic reduction of nitrogen oxides (NO x ) by ammonia (NH3). In this work, Cu-SSZ-13 has been studied at 250 °C under high conversion using a modulation excitation approach and analysed with phase sensitive detection (PSD). While the complementary X-ray absorption near edge structure (XANES) spectroscopy measurements showed that the experiments were performed under cyclic Cu+/Cu2+ redox, Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) experiments provide spectroscopic evidence for previously postulated intermediates Cu-N([double bond, length as m-dash]O)-NH2 and Cu-NO3 in the NH3-SCR deNO x mechanism and for the role of [Cu2+(OH-)]+. These results therefore help in building towards a more comprehensive understanding of the reaction mechanism which to date has only been postulated in silico.
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Affiliation(s)
- Alex G Greenaway
- UK Catalysis Hub , Research Complex at Harwell , Rutherford Appleton Laboratory , Didcot OX11 0FA , UK . .,Department of Chemistry , 20 Gordon Street , London , WC1H 0AJ , UK
| | | | - Adam Thetford
- UK Catalysis Hub , Research Complex at Harwell , Rutherford Appleton Laboratory , Didcot OX11 0FA , UK . .,Department of Chemistry , 20 Gordon Street , London , WC1H 0AJ , UK
| | - Inés Lezcano-González
- UK Catalysis Hub , Research Complex at Harwell , Rutherford Appleton Laboratory , Didcot OX11 0FA , UK . .,Department of Chemistry , 20 Gordon Street , London , WC1H 0AJ , UK
| | - Miren Agote-Arán
- UK Catalysis Hub , Research Complex at Harwell , Rutherford Appleton Laboratory , Didcot OX11 0FA , UK . .,Department of Chemistry , 20 Gordon Street , London , WC1H 0AJ , UK
| | | | - Davide Ferri
- Paul Scherrer Institut , 5232 Villigen , Switzerland
| | | | - C Richard A Catlow
- UK Catalysis Hub , Research Complex at Harwell , Rutherford Appleton Laboratory , Didcot OX11 0FA , UK . .,Department of Chemistry , 20 Gordon Street , London , WC1H 0AJ , UK.,Cardiff Catalysis Institute , School of Chemistry , Cardiff University , Main Building, Park Place , Cardiff , CF10 3AT , UK
| | - Andrew M Beale
- UK Catalysis Hub , Research Complex at Harwell , Rutherford Appleton Laboratory , Didcot OX11 0FA , UK . .,Department of Chemistry , 20 Gordon Street , London , WC1H 0AJ , UK
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37
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Han F, Yuan M, Mine S, Sun H, Chen H, Toyao T, Matsuoka M, Zhu K, Zhang J, Wang W, Xue T. Formation of Highly Active Superoxide Sites on CuO Nanoclusters Encapsulated in SAPO-34 for Catalytic Selective Ammonia Oxidation. ACS Catal 2019. [DOI: 10.1021/acscatal.9b02975] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fei Han
- Department of Electronics and Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, Nankai University, Tianjin 300 071, P. R. China
| | - Mengqi Yuan
- Department of Electronics and Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, Nankai University, Tianjin 300 071, P. R. China
| | - Shinya Mine
- Department of Applied Chemistry, Osaka Prefecture University, Gakuen-Cho 1-1, Sakai, Osaka 599-8531, Japan
| | - Han Sun
- Department of Electronics and Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, Nankai University, Tianjin 300 071, P. R. China
| | - Haijun Chen
- Department of Electronics and Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, Nankai University, Tianjin 300 071, P. R. China
| | - Takashi Toyao
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
- Elements Strategy Initiative for Catalysts and Batteries, Kyoto University, Katsura, Kyoto 615-8520, Japan
| | - Masaya Matsuoka
- Department of Applied Chemistry, Osaka Prefecture University, Gakuen-Cho 1-1, Sakai, Osaka 599-8531, Japan
| | - Kake Zhu
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Road, Shanghai 200 237, P. R. China
| | - Jinlong Zhang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Road, Shanghai 200 237, P. R. China
| | - Weichao Wang
- Department of Electronics and Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, Nankai University, Tianjin 300 071, P. R. China
| | - Tao Xue
- Analysis and Measurement Center, Tianjin University, Tianjin 300 072, P. R. China
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