Copper pairing in the mordenite framework as a function of the Cu(I)/Cu(II) speciation

A series of gas-phase reactants is used to treat a Cu-exchanged mordenite zeolite with the aim studying influence reaction environment on formation Cu pairs. The rearrangement ions form multimeric sites as function their oxidation state was probed by X-ray absorption spectroscopy (XAS) and also applying advanced analysis through wavelet transform, method able specifically locate Cu–Cu interactions in presence overlapping contributions from other scattering paths. nature Cu-oxo species formed upon further crosschecked DFT-assisted fitting EXAFS data resonant Raman spectroscopy. Altogether, CuI/CuII speciation clearly correlates proximity, metal ion pairs quantitatively forming under an oxidative environment.