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Open AccessArticle

VOx Surface Coverage Optimization of V2O5/WO3-TiO2 SCR Catalysts by Variation of the V Loading and by Aging

Paul Scherrer Institut, CH-5232 Villigen, Switzerland
Ecole polytechnique fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
Author to whom correspondence should be addressed.
Academic Editor: Jae-Soon Choi
Catalysts 2015, 5(4), 1704-1720;
Received: 24 August 2015 / Revised: 25 September 2015 / Accepted: 1 October 2015 / Published: 14 October 2015
(This article belongs to the Special Issue Automotive Emission Control Catalysts)
PDF [385 KB, uploaded 14 October 2015]


V2O5/WO3-TiO2 selective catalytic reduction (SCR) catalysts with a V2O5 loading of 1.7, 2.0, 2.3, 2.6, 2.9, 3.2 and 3.5 wt. % were investigated in the fresh state and after hydrothermal aging at 600 °C for 16 h. The catalysts were characterized by means of nitrogen physisorption, X-ray diffraction and X-ray absorption spectroscopy. In the fresh state, the SCR activity increased with increasing V loading. Upon aging, the catalysts with up to 2.3 wt. % V2O5 exhibited higher NOx reduction activity than in the fresh state, while the catalysts with more than 2.6 wt. % V2O5 showed increasing deactivation tendencies. The observed activation and deactivation were correlated with the change of the VOx and WOx surface coverages. Only catalysts with a VOx coverage below 50% in the aged state did not show deactivation tendencies. With respect to tungsten, above one monolayer of WOx, WO3 particles were formed leading to loss of surface acidity, sintering, catalyst deactivation and early NH3 slip. An optimal compromise between activity and hydrothermal aging resistance could be obtained only with V2O5 between 2.0 and 2.6 wt. %. View Full-Text
Keywords: SCR; V2O5; surface coverage; V loading; hydrothermal aging; WO3-TiO2 SCR; V2O5; surface coverage; V loading; hydrothermal aging; WO3-TiO2

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Marberger, A.; Elsener, M.; Ferri, D.; Kröcher, O. VOx Surface Coverage Optimization of V2O5/WO3-TiO2 SCR Catalysts by Variation of the V Loading and by Aging. Catalysts 2015, 5, 1704-1720.

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