Interaction of Methanol and Hydrogen on a ZnO (0001) Single Crystal Surface

Abstract

Thermal reactions of CH3OH on a ZnO (0001) surface with and without coadsorbed atomic hydrogen have been investigated using a temperature-programmed desorption (TPD) technique. Both H2 and CH2O desorb at 510 and 580 K during CH3OH decomposition on ZnO(0001). When H atoms are adsorbed on ZnO(0001), the recombinative desorption of H2 takes place at around 450 K. In the process of CH3OH decomposition on ZnO(0001), H2 desorption is not observed until the surface temperature reaches 510 K. These observations indicate that surface-bound H atoms are not produced up to 510 K. When CD3OD and H are coadsorbed, the desorption of both H2 and HD is observed at 445 K. HD should be formed by the exchange reaction between CD3O–D and H on the surface, which indicates that the CD3O–D bond is partially broken to form an associative CD3···D complex. We suggest two different pathways for the formation of CH2O from CH3OH on ZnO(0001). At 510 K, CH2O and H2 are formed from the surface reaction of CH3O and H. Desorption of CH2O at 580 K is related to the complete decomposition of CH3O.

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