Abstract
X-ray absorption spectroscopy has been used to elucidate the structure of copper-ion-exchanged mordenite in the calcined state. Information about the chemical state and the local structural geometry of the exchanged copper ion has been elucidated by studing the XAXES and EXAFS spectroscopy. These findings show spectral features which would be assigned to Cu(OH)2-like species at 298 K, to CuO phase at 473 K, and to Cu(I) species at 673 K. Cu(I) species is present in an amorphous-like or microcrystalline structure. It is found that N2 molecules are adsorbed strongly on Cu(I) species and give a strong absorption band at 2299 cm-1 in infrared spectroscopy. The analysis of the EXAFS for the adsorbed N2 is performed, and demonstrates that this state is a bent type.
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