Structural and redox properties of VOx and Pd/VOx thin film model catalysts studied by TEM and SAED
Literature Information
Simon Penner, Bernhard Klötzer, Bernd Jenewein
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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