Recognition of depth composition profiles of copper-exchanged mordenites applying analytical methods with different depth vision

Zhukov, Yu. M.; Shelyapina, Marina G.; Efimov, A. Yu.; Жижин, Е. В.; Petranovskii, Vitalii

doi:10.1016/j.matchemphys.2019.121787

Cited by 6 publications

(2 citation statements)

References 19 publications

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“…To get more detailed insight into the position and local structure of copper in selected zeolites, XPS and XAS analyses of selected samples were performed. Literature data on copper local structure investigations in Cu 2+ ‐exchanged natural and synthetic zeolitic sorbents and catalysts using XRD, XAS and/or XPS is extensive, e.g., 16–18. The studies revealed numerous possibilities from octahedral Cu(H 2 O) 6 2+ complexes with water molecules and five‐coordinated and square‐planar complexes with framework oxygen atoms and/or water molecules (e.g., [Cu(O z ) 3 (H 2 O) 2 ] 2+ (O z denotes framework oxygen atom), Cu(OH) 4 2− or [Cu(O z ) 3 (H 2 O)] 2+ ) in HEU‐type zeolites.…”

Section: Resultsmentioning

confidence: 99%

Section: Copper Loadingmentioning

confidence: 99%

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Removal of Copper from Aqueous Solutions with Zeolites and Possible Treatment of Exhaust Materials

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Arčon

Kovač

et al. 2021

Chemie Ingenieur Technik

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The mechanism of Cu 2+ loading into commercially available natural HEU-type and synthetic LTA-type zeolites for their possible use in environmental processes, such as water and air treatment applications, was studied. Elemental analysis, SEM/EDXS, XRD, XAS and XPS analyses revealed 4-fold coordination of Cu 2+ cations with oxygen atoms in the pores, a predominant location of copper atoms on the surface of crystallites and retained crystallinity of zeolites throughout the processes. The post-treatment of Cu 2+ -loaded samples with HCl and/or NaCl solutions confirmed the predominantly reversible sorption of copper on zeolites from aqueous solutions by ion-exchange mechanism and, therefore, excellent regeneration possibilities for both types of zeolites. Furthermore, with the calcination of exhaust metal-loaded zeolites, catalysts for total toluene oxidation reaction, as a model VOC pollutant, were obtained.

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Section: Resultsmentioning

confidence: 99%

Section: Copper Loadingmentioning

confidence: 99%