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CO adsorbed on the four reference Cu-ZSM-5 samples. (a) IR spectra of the samples after interaction with 200 mbar CO and outgassing (spectra have been normalized, and the spectrum of material prior to CO dosage has been subtracted). (b) Uptake of irreversibly bound CO on the samples versus integrated area of the Cu(I) monocarbonyl species. The intercept has been fixed to 0.
