Abstract
The heat treatment effect on the formation of catalytically active copper centers obtained by solid-phase ion exchange between copper chloride and zeolite H-Mordenite was studied using X-ray absorption spectroscopy in the near edge (XANES) and extended (EXAFS) regions beyonds the copper K-edge. The spectra were measured in reaction conditions, at temperatures ranging from room temperature to 400°C. The analysis of the spectra performed by direct calculations of Cu K-XANES and Cu K-EXAFS fitting with account for anharmonic corrections showed that up to 200 ° C ion exchange does not occurs and copper remains in the state of CuCl. The heating above 200 ° C result in implantation of copper atom in zeolite framework.
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