Controlling copper reducibility in mordenites by varying the SiO_2/Al_2O_3 molar ratio

摘要

A hydrogen reduction of copper ions incorporated into a series of mordenites with variable SiO_2/Al_2O_3 molar ratio (MR) leads to a number of the reduced copper species with dominance of small metal particles at high MR which are shown in optical spectra as the plasmon resonance absorption band at 550-600 nm with various spectral shape, while the lowest MR-mordenites prevent the reduction of copper to metal.