Abstract
Abstract Adsorption of methanoi on (1010) and (0001) faces of ZnO and on ZnO(Cu) catalyst surfaces was studied by XPS and UPS in the temperature range from 100 to 320 K. At 100 K not only molecular adsorption and condensation occurred, but also formation of methoxy species (CH 3 O-) was observed on all surfaces. Only on (1010) dissociation yielding a small amount of CH n groups took place at 115 K. On the catalyst surface this type of species was formed above 150 K, while on (0001) faces (CH 2 O) n (para-formaldehyde) was observed at 185 K. The temperature dependent behaviour is analogous and the electron binding energies coincide for the three surfaces. On the catalyst surface formation of methoxy groups is enhanced at room temperature, while no hydroxyl groups are formed on this surface in contrast to the behaviour of the pure ZnO surfaces. A tentative explanation for this behaviour is given.
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