Abstract
The effect of temperature conditions on the formation of copper active sites obtained by solid state ion exchange between copper chloride and H-mordenite zeolite using X-ray absorption spectroscopy in near-threshold (XANES) and extended (EXAFS) spectral regions behind the copper K-edge measured in in-situ conditions of the reaction at temperatures varying from room temperature to 400°C. The analysis of the spectra performed using direct calculations of CuK-XANES and taking into account anharmonic corrections for CuK-EXAFS fitting enables us to establish that there is no ion exchange up to 200°C and copper remains in the CuCl state. An increase in the temperature higher 200°C leads to the incorporation of copper atoms to the zeolite framework.
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ACKNOWLEDGMENTS
The authors are grateful to Prof. J. van Bokhoven for the participation in this work.
Funding
This work was supported by the Russian Scientific Foundation, project no. 18-72-00096 “Changes in the atomic and electronic structures of active copper centers in Cu-zeolites and their catalytic activity during reactions of oxidation of methane to methanol.”
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Translated by Yu. Ryzhkov
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Srabionyan, V.V., Sukharina, G.B., Kaptelinin, S.Y. et al. Effect of Heat Treatment on the Formation of Copper Active Centers Obtained by the Interaction of Copper Chloride with H-Mordenite. Phys. Solid State 62, 1222–1227 (2020). https://doi.org/10.1134/S1063783420070252
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DOI: https://doi.org/10.1134/S1063783420070252