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Journal articles on the topic 'Cu-CHA'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Nasser, Galal A., Haruna Adamu, Akolade I. Bakare, et al. "Conversion of NOx over Aluminosilicate Cu-CHA Zeolite Catalysts Synthesized Free of Organic Structure-Directing Agents." Applied Sciences 13, no. 24 (2023): 13001. http://dx.doi.org/10.3390/app132413001.

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Cu-CHA zeolites have proven to be effective for NOx reduction, but a drawback in using CHA zeolites is the cost associated with using expensive organic structure-directing agents. To overcome this drawback, we are reporting here the synthesis of Cu-CHA zeolite catalysts in both their NH4-form as well as K-form that do not require the use of organic structure-directing agents. After comprehensive characterization by XRF, XRD, 27Al NMR spectroscopy, FE-SEM, SEM/EDS, N2-adsorption/desorption, NH3-TPD, H2-TPR, and XPS, the zeolite catalysts were tested for NOx conversion by NH3-selective catalytic

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2

Li, Yanxia, Yuwen Zhu, Ning Zhang, and Zhongliang Liu. "Simulation of Denitrification of Vehicle Exhaust over Cu-CHA Bazite Catalyst for a Monolith Reactor." Catalysts 11, no. 8 (2021): 930. http://dx.doi.org/10.3390/catal11080930.

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A CFD model with chemical reaction kinetic and heat and mass transfer for a monolith reactor is established by COMSOL Multiphysics to investigate the influence of different operating conditions and water on denitrification efficiency for Cu-CHA. At the low temperature range, water has little effect on the denitrification efficiency over the Cu-CHA catalyst while NO conversion is increased by about 30% at the medium temperature. The concentration of O2 (CO2) has no significant effect on the performance of Cu-CHA catalyst. The best ratio of NO2 to NOx in feed gases may be 1/2, which improves the

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3

Molokova, Anastasia Yu., Abasabadi Reza Khaleghi, Elisa Borfecchia, et al. "Elucidating the reaction mechanism of SO2 with Cu-CHA catalysts for NH3-SCR by X-ray absorption spectroscopy." Chemical Science 14 (October 10, 2023): 11521–31. https://doi.org/10.1039/d3sc03924b.

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The application of Cu-CHA catalysts for the selective catalytic reduction of NOx by ammonia (NH3-SCR) in exhaust systems of diesel vehicles requires the use of fuel with low sulfur content, because the Cu-CHA catalysts are poisoned by higher concentrations of SO2. Understanding the mechanism of the interaction between the Cu-CHA catalyst and SO2 is crucial for elucidating the SO2 poisoning and development of efficient catalysts for SCR reactions. Earlier we have shown that SO2 reacts with the [Cu2II(NH3)4O2]2+ complex that is formed in the pores of Cu-CHA upon activation of O2 in the NH3-SCR c

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4

Vlassa, Mihaela, Gheorghe Borodi, Cristian Silvestru, and Mircea Vlassa. "Hydrogen bonding-based 3D supramolecular architecture of [Cu(CHA)2][TCM]·11H2O." Open Chemistry 12, no. 1 (2014): 14–24. http://dx.doi.org/10.2478/s11532-013-0350-0.

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AbstractReaction of Na4TCM (1) (H4TCM = tetra[4-(carboxyphenyl)oxamethyl]methane) with [Cu(CHA)](ClO4)2 (2)(CHA = 1,3,6,8,11,14-hexaaz atricyclo[12.2.1.1.8,11] octadecane) in a DMF-water mixture yields [Cu(CHA)]2[TCM] (3). Structural analysis of [Cu(CHA)]2[TCM]·11H2O (3·11H2O) by single crystal X-ray diffraction reveals strong copper-oxygen bonds between two complex cations and the tetraanion leading to a 3D coordination network (zwitterionic structure), consolidated through additional NH...O=C hydrogen bonding within the cation/anion association. The resulting coordination geometry around a c

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5

Wilcox, Laura N., Siddarth H. Krishna, Casey B. Jones, and Rajamani Gounder. "Mechanistic studies of NH₃-assisted reduction of mononuclear Cu(ii) cation sites in Cu-CHA zeolites." Catalysis Science & Technology 11, no. 24 (2021): 7932–42. http://dx.doi.org/10.1039/d1cy01646f.

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Spectroscopic, titrimetric, and gas-phase product analysis methods reveal a six-electron process for NH3-assisted reduction of mononuclear Cu(ii) sites to Cu(i) in Cu-CHA zeolites of different Cu(ii) site speciation and density.

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6

Andersen, Casper Welzel, Martin Bremholm, Peter Nicolai Ravnborg Vennestrøm, Anders Bank Blichfeld, Lars Fahl Lundegaard, and Bo Brummerstedt Iversen. "Location of Cu2+in CHA zeolite investigated by X-ray diffraction using the Rietveld/maximum entropy method." IUCrJ 1, no. 6 (2014): 382–86. http://dx.doi.org/10.1107/s2052252514020181.

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Accurate structural models of reaction centres in zeolite catalysts are a prerequisite for mechanistic studies and further improvements to the catalytic performance. The Rietveld/maximum entropy method is applied to synchrotron powder X-ray diffraction data on fully dehydrated CHA-type zeolites with and without loading of catalytically active Cu2+for the selective catalytic reduction of NOxwith NH3. The method identifies the known Cu2+sites in the six-membered ring and a not previously observed site in the eight-membered ring. The sum of the refined Cu occupancies for these two sites matches t

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7

Ma, Jiangli, Shiying Chang, Fei Yu, Huilong Lai, and Yunkun Zhao. "Research Progress on Sulfur Deactivation and Regeneration over Cu-CHA Zeolite Catalyst." Catalysts 12, no. 12 (2022): 1499. http://dx.doi.org/10.3390/catal12121499.

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Benefiting from the exceptional selective catalytic reduction of NOx with ammonia (NH3-SCR) activity, excellent N2 selectivity, and superior hydrothermal durability, the Cu2+-exchanged zeolite catalyst with a chabazite structure (Cu-CHA) has been considered the predominant SCR catalyst in nitrogen oxide (NOx) abatement. However, sulfur poisoning remains one of the most significant deterrents to the catalyst in real applications. This review summarizes the NH3-SCR reaction mechanism on Cu-CHA, including the active sites and the nature of hydrothermal aging resistance. On the basis of the NH3-SC

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8

O'Malley, Alexander J., Iain Hitchcock, Misbah Sarwar, et al. "Ammonia mobility in chabazite: insight into the diffusion component of the NH3-SCR process." Physical Chemistry Chemical Physics 18, no. 26 (2016): 17159–68. http://dx.doi.org/10.1039/c6cp01160h.

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To assess the effect of counterion presence on NH<sub>3</sub> mobility in commercial automotive emission control zeolite catalysts, NH<sub>3</sub> mobility in NH<sub>3</sub>-SCR catalyst Cu-CHA was compared with H-CHA using quasielastic neutron scattering and molecular dynamics simulations.

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9

Martini, A., E. Borfecchia, K. A. Lomachenko, et al. "Composition-driven Cu-speciation and reducibility in Cu-CHA zeolite catalysts: a multivariate XAS/FTIR approach to complexity." Chemical Science 8, no. 10 (2017): 6836–51. http://dx.doi.org/10.1039/c7sc02266b.

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Multivariate XAS analysis and in situ FTIR enable an unprecedented quantitative understanding of the composition impact on temperature-dependent Cu-speciation and reducibility in Cu-CHA zeolite catalysts.

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10

Hammershøi, Peter S., Chiara Negri, Gloria Berlier, Silvia Bordiga, Pablo Beato, and Ton V. W. Janssens. "Temperature-programmed reduction with NO as a characterization of active Cu in Cu-CHA catalysts for NH3-SCR." Catalysis Science & Technology 9, no. 10 (2019): 2608–19. http://dx.doi.org/10.1039/c9cy00358d.

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11

Han, Joonsoo, Joachim Dithmer Bjerregaard, Henrik Grönbeck, Derek Creaser, and Louise Olsson. "Effect of SO2 and SO3 Exposure to Cu-CHA on Surface Nitrate and N2O Formation for NH3−SCR." ACS Engineering Au 4, no. 4 (2024): 405–21. https://doi.org/10.1021/acsengineeringau.4c00004.

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The article is open access and can also be accessed here https://pubs.acs.org/doi/10.1021/acsengineeringau.4c00004?ref=PDFAbstract: We report effects of SO2 and SO3 exposure on ammonium nitrate (AN) and N2O formation in Cu-CHA used for NH3−SCR. First-principles calculations and several characterizations (ICP, BET, XRD, UV−vis− DRS) were applied to characterize the Cu-CHA material and speciation of sulfur species. The first-principles calculations demonstrate that the SO2 exposure results in both (bi)sulfite and (bi)sulfate whereas the SO3 exposure yields only (bi)sulfate. Fur

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12

Negri, Chiara, Andrea Martini, Gabriele Deplano, et al. "Investigating the role of Cu-oxo species in Cu-nitrate formation over Cu-CHA catalysts." Physical Chemistry Chemical Physics 23, no. 34 (2021): 18322–37. http://dx.doi.org/10.1039/d1cp01754c.

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13

Hammershøi, Peter S., Anita L. Godiksen, Susanne Mossin, Peter N. R. Vennestrøm, Anker D. Jensen, and Ton V. W. Janssens. "Site selective adsorption and relocation of SOx in deactivation of Cu–CHA catalysts for NH3-SCR." Reaction Chemistry & Engineering 4, no. 6 (2019): 1081–89. http://dx.doi.org/10.1039/c8re00275d.

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14

Tyrsted, C., E. Borfecchia, G. Berlier, et al. "Nitrate–nitrite equilibrium in the reaction of NO with a Cu-CHA catalyst for NH3-SCR." Catalysis Science & Technology 6, no. 23 (2016): 8314–24. http://dx.doi.org/10.1039/c6cy01820c.

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A multi-technique in situ study of the reaction between NO and Cu-nitrates in the Cu-CHA deNO<sub>x</sub> catalyst yields novel structural and spectroscopic insights into the equilibrium between Cu-nitrates and Cu-nitrites, which was proposed as key step in the NH<sub>3</sub>-SCR cycle.

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15

Liu, Chong, Hiroe Kubota, Takashi Toyao, Zen Maeno, and Ken-ichi Shimizu. "Mechanistic insights into the oxidation of copper(i) species during NH3-SCR over Cu-CHA zeolites: a DFT study." Catalysis Science & Technology 10, no. 11 (2020): 3586–93. http://dx.doi.org/10.1039/d0cy00379d.

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16

Chen, Lin, Hanne Falsig, Ton V. W. Janssens, Jonas Jansson, Magnus Skoglundh, and Henrik Grönbeck. "Effect of Al-distribution on oxygen activation over Cu–CHA." Catalysis Science & Technology 8, no. 8 (2018): 2131–36. http://dx.doi.org/10.1039/c8cy00083b.

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17

Bjerregaard, Joachim Dithmer, Martin Votsmeier, and Henrik Grönbeck. "Influence of aluminium distribution on the diffusion mechanisms and pairing of [Cu(NH3)2]+ complexes in Cu-CHA." Nature Communications 16 (January 11, 2025): 603. https://doi.org/10.1038/s41467-025-55859-1.

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The paper is open access and can be viewed directly from https://rdcu.be/d5X7J Abstract:The performance of Cu-exchanged chabazite (Cu-CHA) for the ammonia-assisted selective catalytic reduction of NO$_x$ (\ce{NH3}-SCR) depends critically on the presence of paired [Cu(NH3)2]+ complexes. Here, a machine-learning force field augmented with long-range Coulomb interactions is developed to investigate the effect of Al-distribution and Cu-loading on the mobility and pairing of [Cu(NH3)2]+ complexes. Performing unbiased and constrained molecular dynamics simulations, we obtain unique in

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18

Zhao, Zhenchao, Rui Yu, Chuan Shi, et al. "Rare-earth ion exchanged Cu-SSZ-13 zeolite from organotemplate-free synthesis with enhanced hydrothermal stability in NH3-SCR of NOx." Catalysis Science & Technology 9, no. 1 (2019): 241–51. http://dx.doi.org/10.1039/c8cy02033g.

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19

Su, Wenkang, Zhenguo Li, Yani Zhang, Chenchen Meng, and Junhua Li. "Identification of sulfate species and their influence on SCR performance of Cu/CHA catalyst." Catalysis Science & Technology 7, no. 7 (2017): 1523–28. http://dx.doi.org/10.1039/c7cy00302a.

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20

Wang, Xueting, Adam A. Arvidsson, Magnus Skoglundh, Anders Hellman, and Per-Anders Carlsson. "Desorption products during linear heating of copper zeolites with pre-adsorbed methanol." Physical Chemistry Chemical Physics 22, no. 13 (2020): 6809–17. http://dx.doi.org/10.1039/c9cp05479k.

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21

Radhakrishnan, Sambhu, Sam Smet, C. Vinod Chandran, et al. "Prediction of Cu Zeolite NH3-SCR Activity from Variable Temperature 1H NMR Spectroscopy." Molecules 28, no. 18 (2023): 6456. http://dx.doi.org/10.3390/molecules28186456.

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Selective catalytic reduction (SCR) of NOx by ammonia is one of the dominant pollution abatement technologies for near-zero NOx emission diesel engines. A crucial step in the reduction of NOx to N2 with Cu zeolite NH3-SCR catalysts is the generation of a multi-electron donating active site, implying the permanent or transient dimerization of Cu ions. Cu atom mobility has been implicated by computational chemistry as a key factor in this process. This report demonstrates how variable temperature 1H NMR reveals the Cu induced generation of sharp 1H resonances associated with a low concentration

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22

Su, Wenkang, Zhenguo Li, Yue Peng, and Junhua Li. "Correlation of the changes in the framework and active Cu sites for typical Cu/CHA zeolites (SSZ-13 and SAPO-34) during hydrothermal aging." Physical Chemistry Chemical Physics 17, no. 43 (2015): 29142–49. http://dx.doi.org/10.1039/c5cp05128b.

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23

Zhang, Nana, Ying Xin, Qian Li, et al. "Ion Exchange of One-Pot Synthesized Cu-SAPO-44 with NH4NO3 to Promote Cu Dispersion and Activity for Selective Catalytic Reduction of NOx with NH3." Catalysts 9, no. 11 (2019): 882. http://dx.doi.org/10.3390/catal9110882.

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Cu-containing CHA type (Cu-CHA) zeolites have been widely investigated owing to their excellent low-temperature activity and high hydrothermal stability in selective catalytic reduction of NOx with NH3 (NH3-SCR). Herein, a series of Cu-SAPO-44 zeolites were prepared by one-pot method with dual-amine templates and the subsequent ion exchange (IE) with NH4NO3. The effect of NH4NO3 treatment on Cu species was investigated by X-ray powder diffraction (XRD), N2 adsorption-desorption isotherm, inductively coupled plasma (ICP); field-emission scanning electron microscope (FE-SEM), high-resolution tra

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24

Sogukkanli, Sibel, Takahiko Moteki, and Masaru Ogura. "Selective methanol formation via CO-assisted direct partial oxidation of methane over copper-containing CHA-type zeolites prepared by one-pot synthesis." Green Chemistry 23, no. 5 (2021): 2148–54. http://dx.doi.org/10.1039/d0gc03645e.

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25

Lei, Huarong, Valentina Rizzotto, Anqi Guo, Daiqi Ye, Ulrich Simon, and Peirong Chen. "Recent Understanding of Low-Temperature Copper Dynamics in Cu-Chabazite NH3-SCR Catalysts." Catalysts 11, no. 1 (2021): 52. http://dx.doi.org/10.3390/catal11010052.

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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,

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26

Pappas, Dimitrios K., Elisa Borfecchia, Michael Dyballa, et al. "Methane to Methanol: Structure–Activity Relationships for Cu-CHA." Journal of the American Chemical Society 139, no. 42 (2017): 14961–75. http://dx.doi.org/10.1021/jacs.7b06472.

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27

Lv, Nangui, Chenhu Sun, Xueqin Wang, Chan Wang, Yuanyuan Yue, and Xiaojun Bao. "Understanding the superior NH₃-SCR activity of CHA zeolite synthesized via template-free interzeolite transformation." Inorganic Chemistry Frontiers 9, no. 6 (2022): 1300–1312. http://dx.doi.org/10.1039/d1qi01414e.

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A highly active NH3-SCR catalyst (Cu-CHAUSY) derived from CHA-type zeolite (CHAUSY) that is synthesized via template-free interzeolite transformation from ultra-stable Y (USY) with specific silicon and aluminum configurations.

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28

Zhao, Pei, Bundet Boekfa, Ken-ichi Shimizu, Masaru Ogura, and Masahiro Ehara. "Selective catalytic reduction of NO with NH3 over Cu-exchanged CHA, GME, and AFX zeolites: a density functional theory study." Catalysis Science & Technology 11, no. 5 (2021): 1780–90. http://dx.doi.org/10.1039/d0cy02342f.

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Density functional theory calculations have been applied to study the selectivity caused by the cage size during the selective catalytic reduction of NO by NH<sub>3</sub> over the Cu-exchanged zeolites with cha, gme, and aft cages.

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29

Borfecchia, Elisa, Chiara Negri, Kirill A. Lomachenko, Carlo Lamberti, Ton V. W. Janssens, and Gloria Berlier. "Temperature-dependent dynamics of NH3-derived Cu species in the Cu-CHA SCR catalyst." Reaction Chemistry & Engineering 4, no. 6 (2019): 1067–80. http://dx.doi.org/10.1039/c8re00322j.

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In situ XAS and UV-vis–NIR spectroscopy shed light on Cu-speciation during NH<sub>3</sub> temperature-programmed desorption and surface reaction (TPSR) over a commercial Cu-chabazite deNO<sub>x</sub> catalyst, expanding the fundamental knowledge required to unravel the NH<sub>3</sub>-SCR mechanism across the whole operation-relevant temperature range.

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30

Borfecchia, Elisa, Pablo Beato, Stian Svelle, Unni Olsbye, Carlo Lamberti, and Silvia Bordiga. "Cu-CHA – a model system for applied selective redox catalysis." Chemical Society Reviews 47, no. 22 (2018): 8097–133. http://dx.doi.org/10.1039/c8cs00373d.

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We review the structural chemistry and reactivity of copper-exchanged molecular sieves with chabazite (CHA) topology, as an industrially applied catalyst in ammonia mediated reduction of harmful nitrogen oxides (NH<sub>3</sub>-SCR) and as a general model system for red-ox active materials (also the recent results in the direct conversion of methane to methanol are considered).

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31

Bjerregaard, Joachim D., Martin Votsmeier, and Henrik Grönbeck. "Mechanism for SO2 poisoning of Cu-CHA during low temperature NH3-SCR." Journal of Catalysis 417 (February 15, 2023): 497–506. https://doi.org/10.1016/j.jcat.2022.12.023.

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Density Functional Theory (DFT) calculations are used to investigate low temperature SO<sub>2</sub> deactivation of Cu-CHA during ammonia assisted selective catalytic reduction of NO (NH<sub>3</sub>-SCR). SO<sub>2</sub> is found to adsorb on forming a copper sulfate complex. NO and NH<sub>3</sub> react over the sulfate complex forming N<sub>2</sub>, H<sub>2</sub>O and H<sub>2</sub>SO<sub>4</sub>. H<sub>2</sub>SO<sub>4</sub> undergoes an acid-base reaction with NH<sub>3</sub> yielding SO<sub>4</sub>(NH<sub>4</sub>)<sub>2</sub> and HSO<sub>4</sub>(NH<sub>4</sub>), where HSO<sub>4</sub>(NH<sub>4<

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32

Feng, Yingxin, Ton V. W. Janssens, Peter N. R. Vennestrøm, Jonas Jansson, Magnus Skoglundh, and Henrik Grönbeck. "The Role of H+- and Cu+-Sites for N2O Formation during NH3-SCR over Cu-CHA." Journal of Physical Chemistry C 125, no. 8 (2021): 4595–601. http://dx.doi.org/10.1021/acs.jpcc.0c11008.

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33

Villamaina, Roberta, Federica Gramigni, Umberto Iacobone, et al. "The H2O Effect on Cu Speciation in Cu-CHA-Catalysts for NH3-SCR Probed by NH3 Titration." Catalysts 11, no. 7 (2021): 759. http://dx.doi.org/10.3390/catal11070759.

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The present work is focused on the effect of water on NH3 adsorption over Cu-CHA SCR catalysts. For this purpose, samples characterized by different SAR (SiO2/Al2O3) ratios and Cu loadings were studied under both dry and wet conditions. H2O adversely affects NH3 adsorption on Lewis acid sites (Cu ions) over all the tested catalysts, as indicated by the decreased NH3 desorption at low temperature during TPD. Interestingly, the NH3/Cu ratio, herein regarded as an index for the speciation of Cu cations, fell in the range of 3–4 (in the presence of gaseous NH3) or 1–2 (no gaseous NH3) in dry condi

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34

Jiang, Han, Bin Guan, Xuesong Peng, et al. "Hydrothermal tolerance towards different temperature conditions over two typical Cu/CHA catalysts." Molecular Catalysis 514 (September 2021): 111846. http://dx.doi.org/10.1016/j.mcat.2021.111846.

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35

Chen, Lin, Ton V. W. Janssens, Magnus Skoglundh, and Henrik Grönbeck. "Interpretation of NH3-TPD Profiles from Cu-CHA Using First-Principles Calculations." Topics in Catalysis 62, no. 1-4 (2018): 93–99. http://dx.doi.org/10.1007/s11244-018-1095-y.

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36

Guo, Jiangfeng, Aiyong Wang, and He Lin. "Enhanced phosphorus resistance of sodium-promoted Cu/CHA catalysts towards NH3-SCR." Catalysis Communications 173 (January 2023): 106568. http://dx.doi.org/10.1016/j.catcom.2022.106568.

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37

Chen, Lin, Hanne Falsig, Ton V. W. Janssens, and Henrik Grönbeck. "Activation of oxygen on (NH3Cu NH3)+ in NH3-SCR over Cu-CHA." Journal of Catalysis 358 (February 2018): 179–86. http://dx.doi.org/10.1016/j.jcat.2017.12.009.

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38

Schmieg, Steven J., Se H. Oh, Chang H. Kim, et al. "Thermal durability of Cu-CHA NH3-SCR catalysts for diesel NOx reduction." Catalysis Today 184, no. 1 (2012): 252–61. http://dx.doi.org/10.1016/j.cattod.2011.10.034.

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39

Hou, Xuxian, Steven J. Schmieg, Wei Li, and William S. Epling. "NH3 pulsing adsorption and SCR reactions over a Cu-CHA SCR catalyst." Catalysis Today 197, no. 1 (2012): 9–17. http://dx.doi.org/10.1016/j.cattod.2012.05.041.

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40

Bensaid, Samir, Vemuri Balakotaiah, and Dan Luss. "Simulation of NOxand soot abatement with Cu-Cha and Fe-ZSM5 catalysts." AIChE Journal 63, no. 1 (2016): 238–48. http://dx.doi.org/10.1002/aic.15551.

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41

Guo, Jiangfeng, Aiyong Wang, and He Lin. "Effect of phosphorus poisoning on the hydrothermal stability of Cu/CHA and Cu/LTA towards NH3-SCR." Microporous and Mesoporous Materials 346 (December 2022): 112313. http://dx.doi.org/10.1016/j.micromeso.2022.112313.

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42

Chen, Peirong, Valentina Rizzotto, Abhishek Khetan, et al. "Mechanistic Understanding of Cu-CHA Catalyst as Sensor for Direct NH3-SCR Monitoring: The Role of Cu Mobility." ACS Applied Materials & Interfaces 11, no. 8 (2019): 8097–105. http://dx.doi.org/10.1021/acsami.8b22104.

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43

Chen, Lin, Ton V. W. Janssens, Peter N. R. Vennestrøm, Jonas Jansson, Magnus Skoglundh, and Henrik Grönbeck. "A Complete Multisite Reaction Mechanism for Low-Temperature NH3-SCR over Cu-CHA." ACS Catalysis 10, no. 10 (2020): 5646–56. http://dx.doi.org/10.1021/acscatal.0c00440.

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44

Lin, Qingjin, Shuhao Xu, Shuang Liu, et al. "Novel Cu-Based CHA/AFI Hybrid Crystal Structure Catalysts Synthesized for NH3-SCR." Industrial & Engineering Chemistry Research 58, no. 39 (2019): 18046–54. http://dx.doi.org/10.1021/acs.iecr.9b01273.

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45

Eijima, Wataru, Gen Shibata, Naoki Shibayama, Yoshimitsu Kobashi, Hideyuki Ogawa, and Ken-ichi Shimizu. "Kinetic modeling of steady-state NH3-SCR over a monolithic Cu-CHA catalyst." Catalysis Today 352 (August 2020): 237–42. http://dx.doi.org/10.1016/j.cattod.2019.09.005.

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46

Hammershøi, Peter S., Yasser Jangjou, William S. Epling, Anker D. Jensen, and Ton V. W. Janssens. "Reversible and irreversible deactivation of Cu-CHA NH3-SCRcatalysts by SO2 and SO3." Applied Catalysis B: Environmental 226 (June 2018): 38–45. http://dx.doi.org/10.1016/j.apcatb.2017.12.018.

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47

Yang, Fuzhen, Ying Xin, Xiaoli Zhu, et al. "Hard Template-Assisted Trans-Crystallization Synthesis of Hierarchically Porous Cu-SSZ-13 with Enhanced NH3-SCR Performance." Catalysts 13, no. 8 (2023): 1217. http://dx.doi.org/10.3390/catal13081217.

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Small porous Cu-SSZ-13 catalysts have recently been commercialized for the selective catalytic reduction of NOx with ammonia (NH3-SCR) on diesel vehicles. Unfortunately, the conventional Cu-SSZ-13 catalyst still confronts the challenge of diffusion limitations, which represent a major obstacle that reduces the catalyst’s SCR performance. Herein, a hierarchically porous SSZ-13 zeolite was synthesized via a trans-crystallization method assisted by the use of carbon black as a hard template in a short synthetic period, and the corresponding Cu-SSZ-13 catalysts with mesopores exhibited improved lo

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Liu, Bihui, Chengfeng Zhang, Jing Zhang, and Xin Zhao. "Wu Shan Shen Cha (Malus asiatica Nakai. Leaves)-Derived Flavonoids Alleviate Alcohol-Induced Gastric Injury in Mice via an Anti-Oxidative Mechanism." Biomolecules 9, no. 5 (2019): 169. http://dx.doi.org/10.3390/biom9050169.

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Wu Shan Shen Cha is the leaf of Malus asiatica Nakai., a special type of tea that is consumed in the same way as green tea. To study the effect of Wu Shan Shen Cha-derived flavonoids (WSSCF) on lesions in the stomach, a 15% hydrochloric acid–95% ethanol (volume ratio 4:6) solution was used to induce gastric injury in mice. The degree of gastric injury was assessed using tissue specimens, and the effects of WSSCF on the serum levels of antioxidant enzymes were investigated. The results showed that WSSCF could alleviate the damage of the gastric mucosa and gastric wall caused by the hydrochloric

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Godiksen, Anita, Frederick N. Stappen, Peter N. R. Vennestrøm, et al. "Coordination Environment of Copper Sites in Cu-CHA Zeolite Investigated by Electron Paramagnetic Resonance." Journal of Physical Chemistry C 118, no. 40 (2014): 23126–38. http://dx.doi.org/10.1021/jp5065616.

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Sun, Lijing, Miao Yang, Lei Cao, et al. "Fabrication of Cu-CHA composites with enhanced NH3-SCR catalytic performances and hydrothermal stabilities." Microporous and Mesoporous Materials 309 (December 2020): 110585. http://dx.doi.org/10.1016/j.micromeso.2020.110585.

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