Abstract
Adsorption of CO on Cu/silicalite reveals the existence of Cu + sites similar in properties to the Cu + cations exchanged in Cu–ZSM-5. In both cases Cu +(CO) 2 dicarbonyls are formed at ambient temperature and under CO equilibrium pressure. These species are converted into monocarbonyls after evacuation. At low temperature, as with Cu–ZSM-5, tricarbonyls are formed on part of the Cu + sites on Cu/silicalite-1. However, the polycarbonyls on the Cu/silicalite-1 sample are less stable as compared to Cu–ZSM-5. In addition, a fraction of Cu + sites rather typical for oxide-supported copper is found with Cu/silicalite-1. The location of the different copper cations in Cu/silicalite-1 is discussed.
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