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Thermal analysis and EPR study of copper species in mordenites prepared by conventional and microwave-assisted methods

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Abstract

Copper-exchanged mordenites prepared by different methods, conventional and microwave assisted, have been investigated by TG, DSC, temperature-programmed reduction (TPR), and EPR methods. TPR study of hydrated and annealed at 573 and 973 K samples revealed that the copper reduction occurs directly from Cu2+ to Cu0, and Cu2+ ions are in different local environments. The microwave-assisted treatment leads to formation of [Cu–O–Cu]2+ species in the main mordenite channels. The most easily recoverable copper in the fully hydrated samples corresponds to the individual Cu2+ ions coordinated by H2O molecules, and the number of these [Cu(H2O)n]2+ complexes does not depend on the preparation method and the total copper content. According to the EPR study, upon sample dehydration, [Cu(H2O)n]2+ species lose water and approach the wall of the zeolite forming a bond with reversible charge transfer from a framework oxygen to Cu2+.

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Acknowledgements

The studies were carried out at the Research Park of Saint Petersburg State University: Centre of Thermal Analysis and Calorimetry and Centre for Magnetic Resonance. This work was partially supported by DGAPA-UNAM IN107817 Grant.

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Authors and Affiliations

  1. Saint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, Russia, 199034

    Marina Shelyapina, Irina Zvereva, Liliya Yafarova, Dmitrii Bogdanov, Stanislav Sukharzhevskii & Yurii Zhukov

  2. Centro de Nanociencias y Nanotecnología de la, Universidad Nacional Autónoma de México, 22860, Ensenada, Baja California, Mexico

    Vitalii Petranovskii

Authors
  1. Marina Shelyapina
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  2. Irina Zvereva
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  3. Liliya Yafarova
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  4. Dmitrii Bogdanov
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  5. Stanislav Sukharzhevskii
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  6. Yurii Zhukov
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  7. Vitalii Petranovskii
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Correspondence to Irina Zvereva.

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Shelyapina, M., Zvereva, I., Yafarova, L. et al. Thermal analysis and EPR study of copper species in mordenites prepared by conventional and microwave-assisted methods. J Therm Anal Calorim 134, 71–79 (2018). https://doi.org/10.1007/s10973-018-7016-2

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  • DOI: https://doi.org/10.1007/s10973-018-7016-2

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