Effect of Heat Treatment on the Formation of Copper Active Centers Obtained by the Interaction of Copper Chloride with H-Mordenite

• Published in: Physics of the solid state Vol. 62; no. 7; pp. 1222 - 1227
• Main Authors: Srabionyan, V. V., Sukharina, G. B., Kaptelinin, S. Yu, Durymanov, V. A., Ermakova, A. M., Kurzina, T. I., Avakyan, L. A., Bugaev, L. A.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.07.2020; Springer; Springer Nature B.V
• Subjects: Analysis; Anharmonicity; Copper; Copper chloride; Heat exchange; Heat treatment; Impurity Centers; Ion exchange; Physics; Physics and Astronomy; Room temperature; Solid State Physics; Spectrum analysis; Temperature; Temperature effects; X ray absorption; Zeolites; solid state synthesis; XANES/EXAFS spectroscopy; Cu-mordenite; zeolites
• ISSN: 1063-7834; 1090-6460
• DOI: 10.1134/S1063783420070252

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 Cu K -XANES and taking into account anharmonic corrections for Cu K -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.