Relevant bibliographies by topics / Cu-CHA

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Cu-CHA'

Author: Grafiati
Published: 2 June 2025
Last updated: 31 July 2025

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Journal articles on the topic "Cu-CHA"

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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Dissertations / Theses on the topic "Cu-CHA"

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Solans, Monfort Xavier. "Modelling of adsorption and catalytic processes in H* and Cu* exchanged ZSM-5 and CHA zeolites." Doctoral thesis, Universitat Autònoma de Barcelona, 2003. http://hdl.handle.net/10803/3165.

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2

Cha, Limei [Verfasser]. "A metastable HCP intermetallic phase in Cu-Al bilayer films / Max-Planck-Institut für Metallforschung, Stuttgart. Vorgelegt von Limei Cha." Stuttgart : Max-Planck-Inst. für Metallforschung, 2006. http://d-nb.info/981078958/34.

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3

"INVESTIGATION OF ACTIVITY AND ACTIVE SITES OF Cu-CHA FOR METHANE ACTIVATION AND SELECTIVE CATALYTIC REDUCTION OF NOx REACTIONS." Tulane University, 2020.

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Books on the topic "Cu-CHA"

1

Li, Shuiqing. Cu cha dan fan. Li Ruiqing, 2005.

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2

rveʺ, Muṃ. Muṃ rveʺ cha rā toʻ mhatʻ cu. 3-тє вид. Citʻ kūʺ khyui khyui Cā pe, 2009.

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3

ʼOṅʻ, Nu Nu. Cha rā Ññui Mra cā cu cā raṅʻʺ. Ranʻ kunʻ Takkasuilʻ, Cā kraññʻʹ tuikʻ Paññā Ṭhāna, 1995.

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ʼOṅʻ, Nu Nu. Cha rā Ññui Mra cā cu cā raṅʻʺ. Ranʻ kunʻ Takkasuilʻ, Cā kraññʻʹ tuikʻ Paññā Ṭhāna, 1995.

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5

GyūX. Cha rā vanʻ tacʻ yokʻ e* mhatʻ cu myā /̋. Rvhe Pu ra puikʻ Cā pe, 1999.

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6

Burma. Pranʻ krāʺ reʺ nhaṅʻʹ Praññʻ sūʹ Chakʻ chaṃ reʺ Ūʺ cīʺ Ṭhāna., ред. 20 rā cu Mranʻ mā cā reʺ cha rā myāʺ nhaṅʻʹ cā cu cā raṅʻʺ. Khyui Teʺ Saṃ Cā pe, 2003.

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7

Tā, Kui. Cā re ̋ cha rā tacʻ yokʻ e* mhatʻ cu myā ̋. Muṃ rve ̋ Cā pe, 2005.

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8

Maṅʻ, Khaṅʻ. Nhacʻ chayʻ Rā cu Mranʻ mā Ca kāʺ pre Cha rā myāʺ. Jaṅʻ Ratanā Cā pe, 2007.

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Yañʻ, Nu. Cha rā toʻ Rvhe kuiṅʻʺ sāʺ ʼa mhatʻ ta ra cā cu myāʺ. Krīʺ pvāʺ reʺ Cā ʼupʻ Tuikʻ, 2012.

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10

Roṅʻ, Ṅve Canʻʺ. Cha rā vanʻʹ bhakʻ ka rheʹ ne luikʻ mayʻ nhaṅʻʹ dhātʻ mhatʻ cu myāʺ. Lakʻ tvai phoʻ Cā ʼupʻ Tuikʻ, 2012.

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Book chapters on the topic "Cu-CHA"

1

Taber, Douglass F. "Metal-Mediated Carbocyclic Construction:The Kobayashi Synthesis of (+)-Fomitellic Acid B." In Organic Synthesis. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199965724.003.0073.

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Jin K. Cha of Wayne State University described (J. Org. Chem. 2009, 74, 5528) the diastereoselective intramolecular cyclopropanation of nitriles with homoallylic alcohols such as 1 . Valery V. Fokin of Scripps/La Jolla found (J. Am. Chem. Soc. 2009, 131, 18034) that the diazoimine derived from 4 could add with high enantioselectivity to aryl alkenes, including styrene 5. Andreas Gansäuer of the University of Bonn optimized (Angew. Chem. Int. Ed. 2009, 48 , 8882; Tetrahedron 2009, 65, 10791) the Ti catalyst to enable efficient cyclization of substrates such as 7 to the corresponding cyclobutane
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2

"IPnad lm ex e r (P Darlomuegrh1t Sev United States, an 9d6t5hea ri n ty dI1n9d6e8x , aAnldl Crop Moisture et al. 1987). On the other hand, it is indeed ra e Yield Moistur eey In 1d9e8x4 ) ( Jionsetheetedv ro er uygyhetanr. oFttooreexxiasmtipnlea , pFo ig rt uiroen1o .5 f th il e lu ssetrcao te usnttrrieesfo in r al. 1991 hat in tiinve th ly enU ew ) in the Philip ni tienddeSxtatth es atisistpgia ne he iSnstiaanngndid elsew anrcdriezaesd in h g ere. Pr epcopAu ipit la re ri ltay ­ tdhreouU gh ntitiesdofSttean te g s, retahteerp th er acnen1t0agpeerarceeanta . f T fe hcu te s d , th beyI1n9d9e5x ) . (SPI), developed by McKee et al. (1993 ation governments of these larger countries are more drough Atisdiisncculsusd io ed nionfc se li v m er aatliccihnadpitceerssfionrtm hi osnvio to r a in ngdaec st caubsltio sh meedda to dealing with water shortages and have in Part III (Monitoring and e lume actively. For n sm ianlf le ra rsc tr ouucn tu tr riees, toitriesspmoonrde , l a ik lb el eyit th re a -t n lo igqiuceasl ) . inFdo ic reas , csoemepOalriid so ap noo ( f1s9 ev 8e5raarl ly p op wualranr in mge te te ocrh o­ ­ tuhseuael ntire coun ). scale ly anroem gi aoln ie asltrpyhm en aoymbeenaaff -e cttheedysrienscueltdrfo ro u m gh ltasrgae re -dur A at n io o n th . eDrrdoiusg ti hntgsuu is shuian ll gyrfeeqau tu ir reeaomfidnr im ou ugmhtof is t its that become es ta in b li asthm ed o sp ahnedr ic p er csiirsctulfaotr io n p er piaotdtse rn osftcoontthirneueemfoonr th msotnothbsecoormeyeeasrtsa . bl T is hheedmbaugt then cwaon mo Fnrtohms, sae as p o la nns, n o in r longer. drought impacts is closely related t nitude of teristics of drought ghapveerssp er eicotu iv sei , mtphle ic astp io a n ti s a . lNcahtairoancs ­ tohnesedtuorfattihoenporfectihpei ta etv io e n nt . shTohre ta g fi e o , tih ts eitn im te ing of the should know the probability that drought may simul­ dr ve-year ( n1s9i7 ty 9 , -a 8n3d ) r ta enge io onuss ly w a it f h fe in cttah ll eiorrbsoervdee ra rs l m an aj dordcervoep lo -p procdounctiinng ­ y th eiosusge ht in northeast Brazil is a good case in point. In gencies if such an event were to occur. Likewise, it is du arrisngirn ie tsh th oefcyleaas rs, 1979 and 1980 were both drought important for governments to know the chances of a sonal rain e fa lplritnocsiipcaslernasieny ( i s .e e . a , so a significant deficiency regional drought simultaneously affecting agricultura tals were slightl n y ) . a b In ov 1e9n8o1r , m th ael, sbeuat ­ pnreoad rb uyctn iv aittiyonisnotnhew ir hocm ou tnhte ry yaarsew de e p ll e n as deandtjafcoernftooodrltdhreo ug te hmt. po Irnal 19 d 8 is 2 tr , ib tuhtei on ra in re fa slul lte to d t al isnwaegrrei cu ble tu lo ral supplies. In some inst normal, but the temporal distribution of precipitatio wnfdrroomugnhetam rb i y ti gnaattiioonnss , tr iagtneagny ces, a nation’s primary was conducive to crop development. Agricultural drought may have signif o ic ri nmgatyhebel ik to e li ihmopoodrtthfaotodaw im e p re a ct fsow llo e w re e d le ss bya dv th er ese. mTohset se ant regional impa sefvoeurre ‘d drroouugghhtt ’ yyeeaa rs r w fo oord ld w su ipdpelioers . inLtihkeewpirs in e, citphaelgorcac in u -r e re xnpcoer ti onfgdnrco ts ugohntm (1 a9t8 ic 3 ) ago ri fcu th lt e u ra plre im vi poaucststw (M en atgya -f lih ve years, with dra­ such as occurred during the ENSO event of 1a9t8 ions, aes et al. 1988). (Glantz et al. 1987, Glantz e2-3 cha D ra rco te urg is httiscs. al T so hedair ffer in terms of their spatial nificantly alter a developing cou tnatlr . y’ 1s9a9c1c ) e , ssmtaoy fo si ogd ­ e sh viofltve fr ogm ra dsueaalsloyn , a to ndser as affect ea esgoino . nIsnoefdb lar m ge ayrxism ev uem re idnrt ought from donor governments. as Brazil, China, India, the Unit ceodunS tr tiaetse , e n su si cthy." In Droughts. Routledge, 2016. http://dx.doi.org/10.4324/9781315830896-31.

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Conference papers on the topic "Cu-CHA"

1

Tanaka, Kotaro, Ibuki Dobashi, Satoshi Sakaida, and Mitsuru Konno. "Experimental and Modeling Study of NH <sub>3</sub> -SCR on a Hydrocarbon-Poisoned Cu-CHA Catalyst." In Energy & Propulsion Conference & Exhibition. SAE International, 2023. http://dx.doi.org/10.4271/2023-01-1659.

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&lt;div class="section abstract"&gt;&lt;div class="htmlview paragraph"&gt;A urea-selective catalytic reduction (SCR) system is used for the reduction of NOx emitted from diesel engines. Although this SCR catalyst can reduce NOx over a wide temperature range, improvements in NOx conversion at relatively low temperatures, such as under cold-start or low-load engine conditions, are necessary. A close-coupled SCR (cc-SCR), which was set just after the engine exhaust manifold, was developed to address this issue. The temperature of the SCR catalyst increases rapidly owing to the higher exhaust temp
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