FT-IR study of CO adsorption on Pt/CeO2: characterisation and structural rearrangement of small Pt particles

Literature Information

Publication Date 2004-11-10
DOI 10.1039/B414159H
Impact Factor 3.676
Authors

P. Bazin, O. Saur, J. C. Lavalley, M. Daturi, G. Blanchard


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Abstract

CO adsorption has been followed by IR spectroscopy on a Pt/CeO2 sample (Pt loading = 0.5%) treated under oxygen and vacuum or reduced by H2 and then evacuated at various temperatures. The sample contains highly dispersed Pt. Attention is paid to the presence of an unusual ν(CO) band at 1937 cm−1 on the reduced sample. Such a band is in particular not observed when the support is fully covered by CO (CO adsorption at liquid nitrogen temperature) or by methanol, allowing one to assign it to CO bridged species bound to both Pt very lowly coordinated and to the support, e.g. to sites at the periphery of very small Pt particules. Experiments performed after sample reduction at 423 K followed by increasing evacuation temperature between 423 and 673 K showed that the increase of the latter provokes a sintering of the Pt particles, due to ceria surface O2− mobility.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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