Structure sensitivity in acetylene reactions over bimetallic Pd/W surfaces |
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Authors: | Barnes R. Abdelrehim I.M. Madey T.E. |
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Affiliation: | (1) Department of Physics and Astronomy and Laboratory for Surface Modification, Rutgers, The State University of New Jersey, Piscataway, NJ 08854-8019, USA |
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Abstract: | Acetylene reactions over a Pd/W(111) surface are found to exhibit size effects on the nanometer scale. Upon annealing 1 ML Pd/W(111), pyramidal facets are formed having bcc(211) faces with nanometer dimensions. The facets grow as a function of annealing time and temperature. Temperature-programmed desorption (TPD) spectra of benzene and ethylene, formed reactively following acetylene adsorption, change as a function of relative facet size. Results are compared to spectra from a similar experiment performed on planar Pd/W(211). TPD of chemisorbed benzene from several different Pd/W surface morphologies are also presented. The data show that structure sensitivity is exhibited for reactively-formed ethylene and benzene, as well as for chemisorbed benzene. |
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Keywords: | structure sensitivity faceted surface bimetallic catalyst palladium tungsten acetylene ethylene benzene |
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