Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9567624 | Applied Surface Science | 2005 | 8 Pages |
Abstract
The structure and NO reactivity of Zr-deposited Pd surfaces were investigated by X-ray photoelectron spectroscopy, low-energy electron diffraction, infrared reflection absorption spectroscopy, and temperature-programmed desorption. Zr on Pd(1Â 0Â 0) was oxidized to ZrO2 by exposure to O2 at 773Â K. Heating at 823Â K in a vacuum led to decomposition of ZrO2 to Zr metal and O2. The activation energy for ZrO2 decomposition changed remarkably at ÎZr = 0.4. For ÎZr > 0.4, a hexagonal structure was observed for ZrO2/Pd(1Â 0Â 0); no ordered structure was observed for ÎZr < 0.4. Deposited Zr had no significant effect on the adsorption and decomposition of NO on Pd(1Â 0Â 0) but resulted in a creation of new NO dissociation sites on Pd(3Â 1Â 1). Zr on Pd(3Â 1Â 1) was oxidized to ZrOX by oxygen produced from NO dissociation. Heating at 823Â K in a vacuum led to decomposition of ZrOX to Zr metal and O2.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
I. Nakamura, H. Hamada, T. Fujitani,