Abstract
Reduction with H 2 of ion-exchanged Cu,Na ZSM-5 produces Cu 0 atoms and protons. In the presence of the CO, part of the Cu 0 is reoxidized to Cu + ions by the zeolitic protons. The Cu + ions are stabilized by formation of a strong Cu +-CO adsorption complex, identified by its i.r. band at 2157 cm −1. After exposure to CO He at 773 K for 30 h, ∼ 65% of the Cu 0 atoms are oxidized. A sharp i.r. band at 969-966 cm −1 is attributed to an asymmetric internal zeolite stretching vibration, which is perturbed by Cu + ions; its intensity increases linearly with that of the band assigned to Cu +-CO.Simultaneously, the intensity of the protonic OH band at 3611 cm 1decreases linearly with increasing Cu + concentration. Relative extinction and integrated absorption coefficients are estimated.
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