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Hydrothermally Stable WO3/ZrO2–Ce0.6Zr0.4O2 Catalyst for the Selective Catalytic Reduction of NO with NH3

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Abstract

A new catalyst WO3/ZrO2–Ce0.6Zr0.4O2 (15 wt % WO3/ZrO2:Ce0.6Zr0.4O2 = 50:50) has been developed for the selective catalytic reduction of NO with NH3. The redox component Ce0.6Zr0.4O2 was dispersed on the surface of acidic WO3/ZrO2 by the solution combustion method showing the best NO x reduction efficiency among the catalysts prepared by various modes of mixing of the components. The catalyst has been characterized by XRD, Raman spectroscopy and NH3-TPD. A NO x reduction efficiency of more than 90 % was obtained between 300 and 500 °C at α = NH3,in/NO x,in = 1. The catalyst showed stable NO x reduction efficiency after hydrothermal ageing at 700 °C. Sulfur poisoning promoted the NO x reduction efficiency at high temperatures at the expense of a reduced activity at lower temperatures, but the catalyst could be fully regenerated by heating in O2 at 650 °C.

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Authors and Affiliations

  1. Paul Scherrer Institut, OVGA/112, 5232, Villigen PSI, Switzerland

    Tinku Baidya, Andreas Bernhard, Martin Elsener & Oliver Kröcher

Authors
  1. Tinku Baidya
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  2. Andreas Bernhard
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  3. Martin Elsener
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  4. Oliver Kröcher
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Correspondence to Oliver Kröcher.

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Baidya, T., Bernhard, A., Elsener, M. et al. Hydrothermally Stable WO3/ZrO2–Ce0.6Zr0.4O2 Catalyst for the Selective Catalytic Reduction of NO with NH3 . Top Catal 56, 23–28 (2013). https://doi.org/10.1007/s11244-013-9923-6

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  • DOI: https://doi.org/10.1007/s11244-013-9923-6

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