Activation of Al2O3 by a long-ranged chemical bond mechanism |
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Authors: | Hellman Anders Grönbeck Henrik |
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Institution: | Competence Centre for Catalysis and Department of Applied Physics, Chalmers University of Technology, SE-412 96 G?teborg, Sweden. |
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Abstract: | On the basis of density functional theory calculations, a novel bond mechanism with chemical strength but of long-ranged character is proposed. As compared to adsorption on a sole oxide or metal, the mechanism is found to enhance the bond strength between an adsorbate and an oxide in contact with a metal. As a model system, NO2 adsorption on alpha-Al2O3(0001) either in contact with Ag(111) or small Agn clusters is used. The observed phenomenon rests on charge transfer and modification of the oxide-metal interface. The mechanism is general in nature and the implication for heterogeneous catalysis is discussed. |
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