Structural and redox properties of VOx and Pd/VOx thin film model catalysts studied by TEM and SAED

Literature Information

Publication Date 2007-03-19
DOI 10.1039/B700650K
Impact Factor 3.676
Authors

Simon Penner, Bernhard Klötzer, Bernd Jenewein


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Abstract

The oxidation of pure V2O3 and Pd/V2O3 films was studied by Transmission Electron Microscopy (TEM) and Selected Area Electron Diffraction (SAED) in the temperature range 673–773 K. Thin films of V2O3 were prepared by reactive deposition of V metal in 10−2 Pa O2 on NaCl(001) cleavage faces. Pd particles were epitaxially grown on NaCl(001) and subsequently embedded in V2O3. Oxidation of both pure V2O3 and Pd/V2O3 at 673 K transforms V2O3 into a platelet-like V2O5 structure. At temperatures T ≥ 773 K, a reconstruction of the platelet-like V2O5 structure into an array of oblong and needle-type V2O5 nanocrystals of different size occurs. Subsequent reduction of the so-prepared structures in 1 bar H2 at 573–673 K results in the formation of the cubic VO phase, whereby the external shape of the original crystals is partially maintained. Upon oxidation at 723 K, Pd is transformed into PdO, but its formation is suppressed in comparison with Pd supported on Al2O3 and occurs only at an about 100 K higher temperature than on Pd/Al2O3. The Pd particles are stabilized against oxidation up to 673 K, PdO decomposes upon reduction in hydrogen between 573 and 673 K.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

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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