Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 107, Issue 3-4, Pages 340-346Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2011.07.034
Keywords
NH3-SCR; Vanadia; Catalysis; EPR; UV-vis; Regeneration; Hydrogen; Raman; Titania
Funding
- LAB SA, France
- CICYT [CTM2008-06876-C02-02/TECNO]
- CTM2008-06876-C02-02/TECNO), PSO [FU5201, F1J7318]
- Vattenfall A/S
- MICINN [CTQ2008-04261PPQ]
- DONG ENERGY A/S
- CSIC
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A series of experiments was conducted to reveal the impact on the catalyst and NH3-SCR activity of an industrial deNO(x) catalyst from Haldor Topsee A/S (V2O5-WO3/TiO2) by exposure to H-2 and H-2/O-2. Treatment of the SCR catalyst was done by exposure for 60min with three different concentrations of H-2 (0-2%) in an 8% O-2/N-2 mixture, where the SCR activity was measured before and after the hydrogen treatment. The results show that the activity of the SCR catalyst is only negligibly affected during exposure to the H-2/O-2 gas and in all cases it returned reversibly to the initial NOx conversion rate after reexposure to the standard NH3-SCR gas. In situ electron paramagnetic resonance (EPR) and UV-vis spectroscopy at 250 degrees C suggest that a significant part of V4+ present during SCR conditions was oxidized to V5+ during exposure to 2% H-2 + 8% O-2. However, the distribution of vanadium in oxidation states V4+ and V5+ returned to the initial redox equilibrium in less than an hour after the hydrogen-oxygen treatment, emphasizing the reversibility of the v(4+)-V5+ system. (C) 2011 Elsevier B.V. All rights reserved.
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