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Interaction of CO with surface PdZn alloys |
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| Authors: | E Jeroro A Datye JM Vohs |
| Institution: | a Department of Chemical and Bimolecular Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA b Department of Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, NM 87131, USA c Pacific Northwest National Laboratory, Richland, WA 99352, USA |
| Abstract: | The adsorption and bonding configuration of CO on clean and Zn-covered Pd(1 1 1) surfaces was studied using low energy electron diffraction (LEED), temperature programmed desorption (TPD) and high resolution electron energy loss spectroscopy (HREELS). LEED and TPD results indicate that annealing at 550 K is sufficient to induce reaction between adsorbed Zn atoms and the Pd(1 1 1) surface resulting in the formation of an ordered surface PdZn alloy. Carbon monoxide was found to bond more weakly to the Zn/Pd(1 1 1) alloy surfaces compared to clean Pd(1 1 1). Zn addition was also found to alter the preferred adsorption sites for CO from threefold hollow to atop sites. Similar behavior was observed for supported Pd-Zn/Al2O3 catalysts. The results of this study show that both ensemble and electronic effects play a role in how Zn alters the interactions of CO with the surface. |
| Keywords: | Low index single crystal surfaces Alcohols Palladium Zinc Thermal desorption Vibrations of adsorbed molecules |
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