Abstract
The fresh and used EUROCAT II V 2O 5–WO 3/TiO 2 catalysts have been studied by electron paramagnetic resonance. For both samples, V 4+ in clusterlike arrangement and two sites corresponding to VO 2+ ions in octahedral symmetry axially distorted were found. It has been shown that the TiO 2 phase transformation (anatase → rutile) occurs at lower temperature (1073 K) for the EUROCAT II catalysts than the WO 3/TiO 2 support. Impurities of Fe 3+ ions were detected both on the catalysts and on the WO 3/TiO 2 support. Q-band measurements have allowed a difference in the environment of the Fe 3+ ions caused by the SCR process to be observed. Finally, traces of Ti 3+ ions in the anatase phase have been detected.
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