The decomposition of ammonia on an oxygen-precovered Ni(110) surface studied by scanning tunneling microscopy |
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| Affiliation: | 1. Institute of Materials Science and Technology, TU Wien, A-1060 Wien, Austria;2. Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden;3. Plansee Composite Materials GmbH, D-86983 Lechbruck am See, Germany;4. Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, A-8700 Leoben, Austria;1. Department of Chemistry, Firoozabad Branch, Islamic Azad University, Firoozabad, Iran;2. Persian Gulf Science and Technology Park, Nano Gostaran Navabegh Fardaye Dashtestan Company, Borazjan, Iran;3. Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain;4. School of Chemical Sciences, Mahatma Gandhi University, Kottayam, 686560, Kerala, India |
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| Abstract: | The decomposition of ammonia on a Ni(110) surface with preadsorbed oxygen has been investigated in ultra-high vacuum at room temperature using scanning tunneling microscopy (STM). We propose a reaction model in which the high reactivity observed at low O coverage is ascribed to a direct interaction between the NH3 molecules and the terminating atoms of the short, mobile -Ni-O- added rows which are observed on the surface under these conditions. This model is consistent with the observation that the surface becomes inert at high O coverage. We believe that the present reaction model can also explain results from some other experiments in which preadsorbed oxygen has been found to act as a promoter for dissociation of H-containing species, such as for NH3 on Cu(110) and H2O on Ni(110). |
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