XPS and TDS study of CO interaction with Pd–AlOx systems |
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Authors: | V. Matolí n, I. Star , N. Tsud,V. Joh nek |
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Affiliation: | V. Matolín, I. Stará, N. Tsud,V. Johánek |
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Abstract: | The metal–substrate and metal–metal interactions (MSI, MMI) represent important effects determining the properties of supported catalysts, gas sensors and gettering alloys. We investigated the MSI and MMI effects by the X-ray photoelectron spectroscopy (XPS) and temperature programmed desorption (TPD) in the case of Pd films deposited on Al2O3 and Al substrates. The study shows that the particle-size dependent metal–substrate interaction plays an important role in CO–Pd chemisorption, namely, in the case of “aluminium rich” Pd–aluminium oxide interface. CO chemisorption exhibits a low-temperature desorption feature at 360 K characteristic for Pd–Al and very small Pd particles. The MSI is explained by the formation of a Pd–Al intermetallic interface exhibiting a strong bimetallic Pd–Al interaction. |
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Keywords: | Pd Al Al2O3 XPS TPD Metal–substrate interaction CO adsorption Bimetallic interaction Model catalysts Heterogeneous catalysis |
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