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Wu Y, Zhao W, Ahn SH, Wang Y, Walter ED, Chen Y, Derewinski MA, Washton NM, Rappé KG, Wang Y, Mei D, Hong SB, Gao F. Interplay between copper redox and transfer and support acidity and topology in low temperature NH 3-SCR. Nat Commun 2023; 14:2633. [PMID: 37149681 PMCID: PMC10164144 DOI: 10.1038/s41467-023-38309-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 04/25/2023] [Indexed: 05/08/2023] Open
Abstract
Low-temperature standard NH3-SCR over copper-exchanged zeolite catalysts occurs on NH3-solvated Cu-ion active sites in a quasi-homogeneous manner. As key kinetically relevant reaction steps, the reaction intermediate CuII(NH3)4 ion hydrolyzes to CuII(OH)(NH3)3 ion to gain redox activity. The CuII(OH)(NH3)3 ion also transfers between neighboring zeolite cages to form highly reactive reaction intermediates. Via operando electron paramagnetic resonance spectroscopy and SCR kinetic measurements and density functional theory calculations, we demonstrate here that such kinetically relevant steps become energetically more difficult with lower support Brønsted acid strength and density. Consequently, Cu/LTA displays lower Cu atomic efficiency than Cu/CHA and Cu/AEI, which can also be rationalized by considering differences in their support topology. By carrying out hydrothermal aging to eliminate support Brønsted acid sites, both CuII(NH3)4 ion hydrolysis and CuII(OH)(NH3)3 ion migration are hindered, leading to a marked decrease in Cu atomic efficiency for all catalysts.
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Affiliation(s)
- Yiqing Wu
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA, 99354, US
| | - Wenru Zhao
- School of Materials Science and Engineering, Tiangong University, Tianjin, 300387, China
| | - Sang Hyun Ahn
- Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, POSTECH, Pohang, 37673, Republic of Korea
| | - Yilin Wang
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA, 99354, US
| | - Eric D Walter
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA, 99354, US
| | - Ying Chen
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA, 99354, US
| | - Miroslaw A Derewinski
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA, 99354, US
- J. Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, 30-239, Krakow, Poland
| | - Nancy M Washton
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA, 99354, US
| | - Kenneth G Rappé
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA, 99354, US
| | - Yong Wang
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA, 99354, US
- Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA, 99163, US
| | - Donghai Mei
- School of Materials Science and Engineering, Tiangong University, Tianjin, 300387, China.
- School of Environmental Science and Engineering, Tiangong University, Tianjin, 300387, China.
| | - Suk Bong Hong
- Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, POSTECH, Pohang, 37673, Republic of Korea.
| | - Feng Gao
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA, 99354, US.
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2
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Gong X, Çağlayan M, Ye Y, Liu K, Gascon J, Dutta Chowdhury A. First-Generation Organic Reaction Intermediates in Zeolite Chemistry and Catalysis. Chem Rev 2022; 122:14275-14345. [PMID: 35947790 DOI: 10.1021/acs.chemrev.2c00076] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Zeolite chemistry and catalysis are expected to play a decisive role in the next decade(s) to build a more decentralized renewable feedstock-dependent sustainable society owing to the increased scrutiny over carbon emissions. Therefore, the lack of fundamental and mechanistic understanding of these processes is a critical "technical bottleneck" that must be eliminated to maximize economic value and minimize waste. We have identified, considering this objective, that the chemistry related to the first-generation reaction intermediates (i.e., carbocations, radicals, carbenes, ketenes, and carbanions) in zeolite chemistry and catalysis is highly underdeveloped or undervalued compared to other catalysis streams (e.g., homogeneous catalysis). This limitation can often be attributed to the technological restrictions to detect such "short-lived and highly reactive" intermediates at the interface (gas-solid/solid-liquid); however, the recent rise of sophisticated spectroscopic/analytical techniques (including under in situ/operando conditions) and modern data analysis methods collectively compete to unravel the impact of these organic intermediates. This comprehensive review summarizes the state-of-the-art first-generation organic reaction intermediates in zeolite chemistry and catalysis and evaluates their existing challenges and future prospects, to contribute significantly to the "circular carbon economy" initiatives.
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Affiliation(s)
- Xuan Gong
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, Hubei P. R. China
| | - Mustafa Çağlayan
- KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia
| | - Yiru Ye
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, Hubei P. R. China
| | - Kun Liu
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, Hubei P. R. China
| | - Jorge Gascon
- KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia
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3
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Jablonska M, Góra-Marek K, Bruzzese PC, Palčić A, Pyra K, Tarach K, Bertmer M, Poppitz D, Pöppl A, Gläser R. Influence of Framework n(Si)/n(Al) Ratio on the Nature of Cu Species in Cu‐ZSM‐5 for NH3‐SCR‐DeNOx. ChemCatChem 2022. [DOI: 10.1002/cctc.202200627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | - Kinga Góra-Marek
- Jagiellonian University: Uniwersytet Jagiellonski w Krakowie Faculty of Chemistry POLAND
| | - Paolo Cleto Bruzzese
- Leipzig University: Universitat Leipzig Felix Bloch Institute for Solid State Physics GERMANY
| | - Ana Palčić
- Ruder Boskovic Institute: Institut Ruder Boskovic Laboratory for the Synthesis of New Materials GERMANY
| | - Kamila Pyra
- Jagiellonian University: Uniwersytet Jagiellonski w Krakowie Faculty of Chemistry POLAND
| | - Karolina Tarach
- Jagiellonian University: Uniwersytet Jagiellonski w Krakowie Faculty of Chemistry POLAND
| | - Marko Bertmer
- Leipzig University: Universitat Leipzig Felix Bloch Institute for Solid State Physics GERMANY
| | - David Poppitz
- Leipzig University: Universitat Leipzig Institute of Chemical Technology GERMANY
| | - Andreas Pöppl
- Leipzig University: Universitat Leipzig Felix Bloch Institute for Solid State Physics GERMANY
| | - Roger Gläser
- Leipzig University: Universitat Leipzig Institute of Chemical Technology GERMANY
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4
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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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5
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van Vreeswijk SH, Weckhuysen BM. Emerging Analytical Methods to Characterize Zeolite-Based Materials. Natl Sci Rev 2022; 9:nwac047. [PMID: 36128456 PMCID: PMC9477204 DOI: 10.1093/nsr/nwac047] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Revised: 02/23/2022] [Accepted: 02/28/2022] [Indexed: 11/23/2022] Open
Abstract
Zeolites and zeolitic materials are, through their use in numerous conventional and sustainable applications, very important to our daily lives, including to foster the necessary transition to a more circular society. The characterization of zeolite-based materials has a tremendous history and a great number of applications and properties of these materials have been discovered in the past decades. This review focuses on recently developed novel as well as more conventional techniques applied with the aim of better understanding zeolite-based materials. Recently explored analytical methods, e.g. atom probe tomography, scanning transmission X-ray microscopy, confocal fluorescence microscopy and photo-induced force microscopy, are discussed on their important contributions to the better understanding of zeolites as they mainly focus on the micro- to nanoscale chemical imaging and the revelation of structure–composition–performance relationships. Some other techniques have a long and established history, e.g. nuclear magnetic resonance, infrared, neutron scattering, electron microscopy and X-ray diffraction techniques, and have gone through increasing developments allowing the techniques to discover new and important features in zeolite-based materials. Additional to the increasing application of these methods, multiple techniques are nowadays used to study zeolites under working conditions (i.e. the in situ/operando mode of analysis) providing new insights in reaction and deactivation mechanisms.
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Affiliation(s)
- S H van Vreeswijk
- Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - B M Weckhuysen
- Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
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6
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Jabłońska M, Góra-Marek K, Fernadi Lukman M, Tarach K, Bertmer M, Denecke R, Poppitz D, Marcinowski K, Pöppl A, Gläser R. Selective catalytic reduction of NO x over micro-/meso-/macroporous Cu-SAPO-34. Catal Sci Technol 2022. [DOI: 10.1039/d2cy01548j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Micro-/meso-/macroporous Cu-containing SAPO-34 prepared by the post-synthetic modification of a commercial support with diethylamine (DEA), shows enhanced activity in NH3-SCR-DeNOx.
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Affiliation(s)
- Magdalena Jabłońska
- Institute of Chemical Technology, Universität Leipzig, Linnéstr. 3, 04103 Leipzig, Germany
| | - Kinga Góra-Marek
- Faculty of Chemistry, Jagiellonian University in Krakow, Gronostajowa 2, 30-387 Krakow, Poland
| | - Muhammad Fernadi Lukman
- Felix Bloch Institute for Solid State Physics, Universität Leipzig, Linnéstr. 5, 04103 Leipzig, Germany
| | - Karolina Tarach
- Faculty of Chemistry, Jagiellonian University in Krakow, Gronostajowa 2, 30-387 Krakow, Poland
| | - Marko Bertmer
- Felix Bloch Institute for Solid State Physics, Universität Leipzig, Linnéstr. 5, 04103 Leipzig, Germany
| | - Reinhard Denecke
- Wilhelm-Ostwald-Institute for Physical and Theoretical Chemistry, Universität Leipzig, Linnéstr. 2, D-04103 Leipzig, Germany
| | - David Poppitz
- Institute of Chemical Technology, Universität Leipzig, Linnéstr. 3, 04103 Leipzig, Germany
| | - Konstantin Marcinowski
- Institute of Chemical Technology, Universität Leipzig, Linnéstr. 3, 04103 Leipzig, Germany
| | - Andreas Pöppl
- Felix Bloch Institute for Solid State Physics, Universität Leipzig, Linnéstr. 5, 04103 Leipzig, Germany
| | - Roger Gläser
- Institute of Chemical Technology, Universität Leipzig, Linnéstr. 3, 04103 Leipzig, Germany
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7
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Mozgawa B, Zasada F, Fedyna M, Góra-Marek K, Tabor E, Mlekodaj K, Dědeček J, Zhao Z, Pietrzyk P, Sojka Z. Analysis of NH 3 -TPD Profiles for CuSSZ-13 SCR Catalyst of Controlled Al Distribution - Complexity Resolved by First Principles Thermodynamics of NH 3 Desorption, IR and EPR Insight into Cu Speciation*. Chemistry 2021; 27:17159-17180. [PMID: 34751471 DOI: 10.1002/chem.202102790] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Indexed: 11/06/2022]
Abstract
NH3 temperature-programmed desorption (NH3 -TPD) is frequently used for probing the nature of the active sites in CuSSZ-13 zeolite for selective catalytic reduction (SCR) of NOx . Herein, we propose an interpretation of NH3 -TPD results, which takes into account the temperature-induced dynamics of NH3 interaction with the active centers. It is based on a comprehensive DFT/GGA+D and first-principles thermodynamic (FPT) modeling of NH3 adsorption on single Cu2+ , Cu+ , [CuOH]+ centers, dimeric [Cu-O-Cu]2+ , [Cu-O2 2- -Cu]2 species, segregated CuO nanocrystals and Brønsted acid sites (BAS). Theoretical TPD profiles are compared with the experimental data measured for samples of various Si/Al ratios and distribution of Al within the zeolite framework. Copper reduction, its relocation, followed by the intrazeolite olation/oxolation processes, which are concomitant with NH3 desorption, were revealed by electron paramagnetic resonance (EPR) and IR. DFT/FPT results show that the peaks in the desorption profiles cannot be assigned univocally to the particular Cu and BAS centers, since the observed low-, medium- and high-temperature desorption bands have contributions coming from several species, which dynamically change their speciation and redox states during NH3 -TPD experiment. Thus, a rigorous interpretation of the NH3 -TPD profiles of CuSSZ-13 in terms of the strength and concentration of the active centers of a particular type is problematic. Nonetheless, useful connections for molecular interpretation of TPD profiles can be established between the individual component peaks and the corresponding ensembles of the adsorption centers.
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Affiliation(s)
- Bartosz Mozgawa
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387, Krakow, Poland
| | - Filip Zasada
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387, Krakow, Poland
| | - Monika Fedyna
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387, Krakow, Poland
| | - Kinga Góra-Marek
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387, Krakow, Poland
| | - Edyta Tabor
- J. Heyrovský Institute of Physical Chemistry, Czech Academic Sciences, Dolejškova 3, Prague, 18223, Czech Republic
| | - Kinga Mlekodaj
- J. Heyrovský Institute of Physical Chemistry, Czech Academic Sciences, Dolejškova 3, Prague, 18223, Czech Republic
| | - Jiří Dědeček
- J. Heyrovský Institute of Physical Chemistry, Czech Academic Sciences, Dolejškova 3, Prague, 18223, Czech Republic
| | - Zhen Zhao
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, Liaoning, 110034, P. R. China
| | - Piotr Pietrzyk
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387, Krakow, Poland
| | - Zbigniew Sojka
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387, Krakow, Poland
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8
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Bruzzese PC, Salvadori E, Jäger S, Hartmann M, Civalleri B, Pöppl A, Chiesa M. 17O-EPR determination of the structure and dynamics of copper single-metal sites in zeolites. Nat Commun 2021; 12:4638. [PMID: 34330914 PMCID: PMC8324863 DOI: 10.1038/s41467-021-24935-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Accepted: 07/07/2021] [Indexed: 02/07/2023] Open
Abstract
The bonding of copper ions to lattice oxygens dictates the activity and selectivity of copper exchanged zeolites. By 17O isotopic labelling of the zeolite framework, in conjunction with advanced EPR methodologies and DFT modelling, we determine the local structure of single site CuII species, we quantify the covalency of the metal-framework bond and we assess how this scenario is modified by the presence of solvating H216O or H217O molecules. This enables to follow the migration of CuII species as a function of hydration conditions, providing evidence for a reversible transfer pathway within the zeolite cage as a function of the water pressure. The results presented in this paper establish 17O EPR as a versatile tool for characterizing metal-oxide interactions in open-shell systems.
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Affiliation(s)
- Paolo Cleto Bruzzese
- grid.9647.c0000 0004 7669 9786Felix Bloch Institute for Solid State Physics, Universität Leipzig, Leipzig, Germany ,grid.7605.40000 0001 2336 6580Department of Chemistry and NIS Centre of Excellence, University of Turin, Torino, Italy
| | - Enrico Salvadori
- grid.7605.40000 0001 2336 6580Department of Chemistry and NIS Centre of Excellence, University of Turin, Torino, Italy
| | - Stefan Jäger
- Erlangen Center for Interface Research and Catalysis (ECRC), Erlangen, Germany
| | - Martin Hartmann
- Erlangen Center for Interface Research and Catalysis (ECRC), Erlangen, Germany
| | - Bartolomeo Civalleri
- grid.7605.40000 0001 2336 6580Department of Chemistry and NIS Centre of Excellence, University of Turin, Torino, Italy
| | - Andreas Pöppl
- grid.9647.c0000 0004 7669 9786Felix Bloch Institute for Solid State Physics, Universität Leipzig, Leipzig, Germany
| | - Mario Chiesa
- grid.7605.40000 0001 2336 6580Department of Chemistry and NIS Centre of Excellence, University of Turin, Torino, Italy
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9
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Effect of Textural Properties and Presence of Co-Cation on NH3-SCR Activity of Cu-Exchanged ZSM-5. Catalysts 2021. [DOI: 10.3390/catal11070843] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Comparative studies over micro-/mesoporous Cu-containing zeolites ZSM-5 prepared by top-down treatment involving NaOH, TPAOH or mixture of NaOH/TPAOH (tetrapropylammonium hydroxide) were conducted. The results of the catalytic data revealed the highest activity of the Cu-ZSM-5 catalyst both in the absence and presence of water vapor. The physico-chemical characterization (diffuse reflectance UV-Vis (DR UV-Vis), Fourier transform infrared (FT-IR) spectroscopy, electron paramagnetic resonance (EPR) spectroscopy, temperature-programmed desorption of NOx (TPD-NOx), and microkinetic modeling) results indicated that the microporous structure of ZSM-5 effectively stabilized isolated Cu ion monomers. Besides the attempts targeted to the modification of the textural properties of the parent ZSM-5, in the next approach, we studied the effect of the co-presence of sodium and copper cations in the microporous H-ZSM-5. The presence of co-cation promoted the evolution of [Cu–O–Cu]2+ dimers that bind NOx strongly with the desorption energy barrier of least 80 kJ mol−1. Water presence in the gas phase significantly decreases the rate of ammonia oxidation, while the reaction rates and activation energies of NH3-SCR remain unaffected.
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10
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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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11
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Liang J, Mi Y, Song G, Peng H, Li Y, Yan R, Liu W, Wang Z, Wu P, Liu F. Environmental benign synthesis of Nano-SSZ-13 via FAU trans-crystallization: Enhanced NH 3-SCR performance on Cu-SSZ-13 with nano-size effect. JOURNAL OF HAZARDOUS MATERIALS 2020; 398:122986. [PMID: 32502803 DOI: 10.1016/j.jhazmat.2020.122986] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2020] [Revised: 05/13/2020] [Accepted: 05/16/2020] [Indexed: 06/11/2023]
Abstract
Small pore zeolites with chabazite structure have been commercialized for selective catalytic reduction (SCR) of nitrogen oxides (NOx) with ammonium (NH3) from diesel exhaust. However, conventional zeolite synthesis processes detrimental effects on the environment due to the consumption of large amount of water, organic templates. Thus, this study proposed a green synthesis process with addition of minimal amount of water, structure directing agent and shortened steps to prepare nano-sized SSZ-13 (0.12 μm) using trans-crystallization strategy and exhibited enhanced performance for NOx removal after copper ion-exchange. The operation temperature window (NOx conversion >90 %) as well as the SO2 and H2O resistance over the green-route prepared nano-sized SSZ-13 (178-480 °C) outperformed the conventional SSZ-13 (29.8 μm, 211-438 °C) mainly due to the much shorter diffusion path. This clearly implied that the mass transportation was key for NH3-SCR of NOx on such small pore zeolite catalysts, which was further confirmed via an in-depth mass transportation calculation process. These results demonstrate that the Cu-nano-sized SSZ-13 prepared by the environmental benign route has great potential to act as a new generation of deNOx catalyst for diesel exhaust and provided a guideline for researchers to develop new methods to synthesize nano-catalysts for air pollution control.
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Affiliation(s)
- Jian Liang
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, College of Chemistry, Nanchang University, 999 Xuefu Road, Nanchang, Jiangxi 330031, China
| | - Yangyang Mi
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, College of Chemistry, Nanchang University, 999 Xuefu Road, Nanchang, Jiangxi 330031, China
| | - Ge Song
- Department of Civil, Environmental, and Construction Engineering, Catalysis Cluster for Renewable Energy and Chemical Transformations (REACT), NanoScience Technology Center (NSTC), University of Central Florida, Orlando, FL 32816, United States
| | - Honggen Peng
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, College of Chemistry, Nanchang University, 999 Xuefu Road, Nanchang, Jiangxi 330031, China.
| | - Yonglong Li
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, College of Chemistry, Nanchang University, 999 Xuefu Road, Nanchang, Jiangxi 330031, China
| | - Ran Yan
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, College of Chemistry, Nanchang University, 999 Xuefu Road, Nanchang, Jiangxi 330031, China
| | - Wenming Liu
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, College of Chemistry, Nanchang University, 999 Xuefu Road, Nanchang, Jiangxi 330031, China
| | - Zheng Wang
- State Key Laboratory of High-efficiency Utilization of Coal & Green Chemical Engineering, Ningxia University, Yinchuan 750021, China
| | - Peng Wu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry and Molecular Engineering, East China Normal University, North Zhongshan Road 3663, Shanghai 200062, China
| | - Fudong Liu
- Department of Civil, Environmental, and Construction Engineering, Catalysis Cluster for Renewable Energy and Chemical Transformations (REACT), NanoScience Technology Center (NSTC), University of Central Florida, Orlando, FL 32816, United States.
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12
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Zhang Y, Peng Y, Li J, Groden K, McEwen JS, Walter ED, Chen Y, Wang Y, Gao F. Probing Active-Site Relocation in Cu/SSZ-13 SCR Catalysts during Hydrothermal Aging by In Situ EPR Spectroscopy, Kinetics Studies, and DFT Calculations. ACS Catal 2020. [DOI: 10.1021/acscatal.0c01590] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yani Zhang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - 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
| | - Kyle Groden
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, Washington 99164, United States
| | - Jean-Sabin McEwen
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, Washington 99164, United States
- Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164, United States
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States
- Department of Biological Systems Engineering, Washington State University, Pullman, 99164, United States
| | - Eric D. Walter
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Ying Chen
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Yong Wang
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, Washington 99164, United States
| | - Feng Gao
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
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13
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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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14
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Abstract
Nanosized SSZ-13 was synthesized hydrothermally by applying N,N,N-trimethyl-1-adamantammonium hydroxide (TMAdaOH) as a structure-directing agent. In the next step, the quantity of TMAdaOH in the initial synthesis mixture of SSZ-13 was reduced by half. Furthermore, we varied the sodium hydroxide concentration. After ion-exchange with copper ions (Cu2+ and Cu+), the Cu-SSZ-13 catalysts were characterized to explore their framework composition (XRD, solid-state NMR, ICP-OES), texture (N2-sorption, SEM) and acid/redox properties (FT-IR, TPR-H2, DR UV-Vis, EPR). Finally, the materials were tested in the selective catalytic reduction of NOx with ammonia (NH3-SCR). The main difference between the Cu-SSZ-13 catalysts was the number of Cu2+ in the double six-membered ring (6MRs). Such copper species contribute to a high NH3-SCR activity. Nevertheless, all materials show comparable activity in NH3-SCR up to 350 °C. Above 350 °C, NO conversion decreased for Cu-SSZ-13(2–4) due to side reaction of NH3 oxidation.
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15
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Moreno-González M, Millán R, Concepción P, Blasco T, Boronat M. Spectroscopic Evidence and Density Functional Theory (DFT) Analysis of Low-Temperature Oxidation of Cu+ to Cu2+NOx in Cu-CHA Catalysts: Implications for the SCR-NOx Reaction Mechanism. ACS Catal 2019. [DOI: 10.1021/acscatal.8b04717] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Marta Moreno-González
- Instituto de Tecnología Química, Universitat Politècnica de València - Consejo Superior de Investigaciones Cientificas, Av. de los Naranjos, s/n, 46022 Valencia, Spain
| | - Reisel Millán
- Instituto de Tecnología Química, Universitat Politècnica de València - Consejo Superior de Investigaciones Cientificas, Av. de los Naranjos, s/n, 46022 Valencia, Spain
| | - Patricia Concepción
- Instituto de Tecnología Química, Universitat Politècnica de València - Consejo Superior de Investigaciones Cientificas, Av. de los Naranjos, s/n, 46022 Valencia, Spain
| | - Teresa Blasco
- Instituto de Tecnología Química, Universitat Politècnica de València - Consejo Superior de Investigaciones Cientificas, Av. de los Naranjos, s/n, 46022 Valencia, Spain
| | - Mercedes Boronat
- Instituto de Tecnología Química, Universitat Politècnica de València - Consejo Superior de Investigaciones Cientificas, Av. de los Naranjos, s/n, 46022 Valencia, Spain
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16
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Shi L, Zhang J, Shen G, Fan D, Wen Y, Zhao Y, Chen R, Shen M, Shan B. Water mediated oxygen activation in NH 3 SCR reaction over a Cu-SAPO-34 catalyst: a first principles study. Catal Sci Technol 2019. [DOI: 10.1039/c8cy02618a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
H2O co-adsorbed with NH3 on Cu sites decreases the reaction energy barriers of O2 activation over Cu-SAPO-34 at low temperature.
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Affiliation(s)
- Lu Shi
- State Key Laboratory of Material Processing and Die and Mould Technology and School of Materials Science and Technology
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Jie Zhang
- State Key Laboratory of Material Processing and Die and Mould Technology and School of Materials Science and Technology
- Huazhong University of Science and Technology
- Wuhan 430074
- China
- Faculty of Materials Science and Engineering
| | - Gurong Shen
- Key Laboratory for Green Chemical Technology of State Education Ministry
- School of Chemical Engineering & Technology
- Tianjin University
- Tianjin 300072
- China
| | - Dequan Fan
- Key Laboratory for Green Chemical Technology of State Education Ministry
- School of Chemical Engineering & Technology
- Tianjin University
- Tianjin 300072
- China
| | - Yanwei Wen
- State Key Laboratory of Material Processing and Die and Mould Technology and School of Materials Science and Technology
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Yunkun Zhao
- State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metal
- Kunming Institute of Precious Metals
- Kunming 650106
- China
| | - Rong Chen
- State Key Laboratory of Digital Manufacturing Equipment and Technology and School of Mechanical Science and Engineering
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Meiqing Shen
- Key Laboratory for Green Chemical Technology of State Education Ministry
- School of Chemical Engineering & Technology
- Tianjin University
- Tianjin 300072
- China
| | - Bin Shan
- State Key Laboratory of Material Processing and Die and Mould Technology and School of Materials Science and Technology
- Huazhong University of Science and Technology
- Wuhan 430074
- China
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