H2 reduction of surface oxides on Pd-based membrane model systems -- The case of Pd(1 0 0) and Pd75Ag25(1 0 0).
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| Title: | H |
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| Authors: | Fernandes, V. R.1, Gustafson, J.2, Farstad, M. H.1, Walle, L. E.1, Blomberg, S.2, Lundgren, E.2, Venvik, H. J.3, Borg, A.1 anne.borg@ntnu.no |
| Source: | Applied Surface Science. Sep2014, Vol. 313, p794-803. 10p. |
| Subjects: | Palladium compounds, Hydrogen, Chemical reduction, Surface chemistry, Artificial membranes, Photoelectron spectroscopy |
| Abstract: | Reduction of the (√5 x √5)R27° surface oxide on Pd(1 0 0) and Pd75Ag25(1 0 0) surfaces by H2 has been studied using high-resolution photoelectron spectroscopy in situ at H2 pressures 5 x 10-9 mbar and 5 x 10-8 mbar and selected temperatures in the range 30 °C to 170 °C. The reduction is slower on Pd75Ag25(1 0 0) compared to Pd(1 0 0) for all temperatures and pressures investigated. For Pd(1 0 0), the surface oxide reduction rate is rather independent of temperature, while for Pd75Ag25(1 0 0) a non-monotonic variation is observed. As indicated by kinetic analysis, the complex reduction behavior is not well described by Avrami kinetics. Oxygen spillover effects contribute to this picture for Pd(1 0 0), while surface compositional effects appear to dominate the performance for Pd75Ag25(1 0 0). These findings may have implications for understanding the oxidation, reduction and hydrogen transport properties of Pd-Ag membranes. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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