Abstract
The chemisorption of NH 3 on the ZnO(101̄0) and Cu 2O(111) non-polar surfaces is theoretically investigated to look into the different Lewis acidity of exposed, unsaturated Zn(II) and Cu(I) ions. Both molecular and dissociative processes have been taken into account for NH 3 on ZnO(101̄0), whereas only the molecular chemisorption of NH 3 on Cu 2O(111) has been considered. Calculations include the evaluation of surface relaxation before/after chemisorption, optimized adsorbate geometries, chemisorption energies and adsorbate vibrational frequencies. Theoretical data indicate that the chemisorption of NH 3 on the defect free ZnO(101̄0) surface occurs only molecularly and that the adsorbate is more tightly bound to Cu(I) than to Zn(II) sites. The agreement with available experimental data is satisfactory.
Published Version
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