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Infrared study of CO adsorption on alumina supported palladium particles

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Wolter,  Kai
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Seiferth,  Oliver
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Libuda,  Jörg
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Kuhlenbeck,  Helmut
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Bäumer,  Marcus
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Freund,  Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Wolter, K., Seiferth, O., Libuda, J., Kuhlenbeck, H., Bäumer, M., & Freund, H.-J. (1998). Infrared study of CO adsorption on alumina supported palladium particles. Surface Science, 402-404, 428-432. doi:10.1016/S0039-6028(97)01053-4.


Cite as: https://hdl.handle.net/21.11116/0000-0007-5B2E-1
Abstract
We have studied the adsorption of CO on small palladium particles deposited on a well-ordered thin Al2O3 film on NiAl(110) using infrared reflection absorption spectroscopy (IRAS). Recent studies in our group with STM and SPA-LEED have shown that the deposited particles are predominantly terminated by (111)-type surfaces. The IR spectra exhibit several absorption bands, which are associated with linearly bound CO (2090–2120 cm−1) and bridge bonded CO (1930–1970 cm−1). On the larger, better ordered palladium aggregates another CO-induced band appears in the region of 1970–2000 cm−1, which we assign to CO molecules bound on the edges of the particles. Evaporation of Pd in presence of a CO atmosphere leads to the formation of a palladium carbonyl-like compound which is stable only at low temperatures. The IR spectra of this species show apparent similarities with the spectra of CO on the small particles.