Effect of Heat Treatment on the Formation of Copper Active Centers Obtained by the Interaction of Copper Chloride with H-Mordenite
Physics of the Solid State(2020)
摘要
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.
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关键词
XANES/EXAFS spectroscopy,zeolites,Cu-mordenite,solid state synthesis
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