Structural sensitivity of NO decomposition over a V-O-W/Ti(Sn)O2 catalyst
| Autor: | M. Najbar, Aleksandra Wesełucha-Birczyńska, J. Banaś, Vesna Tomašić |
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| Rok vydání: | 2007 |
| Předmět: |
Catalyst support
nitrogen oxide decomposition Inorganic chemistry Oxide Analytical chemistry chemistry.chemical_element surface species structure General Chemistry Tungsten Heterogeneous catalysis rutile-supported vanadia-tungsta catalyst Catalysis Vanadium oxide chemistry.chemical_compound chemistry Monolayer Crystallite |
| Zdroj: | Catalysis Today. 119:199-203 |
| ISSN: | 0920-5861 |
| DOI: | 10.1016/j.cattod.2006.08.043 |
| Popis: | NO decomposition at 673 K as a function of contact times over a V-O-W/Ti(Sn)O 2 catalyst obtained by sol–gel method and pretreated at 673 K in helium stream was investigated and compared with that over a Cu-ZSM-5 catalyst. Feed containing 4% NO in a helium stream was used in both the cases. The V-O-W/Ti(Sn)O 2 catalyst showed higher activity as well as higher selectivity to dinitrogen than the Cu-ZSM-5 catalyst over the whole range of used contact times (0.375–15 g s cm −3 ). The highest activity of the V-O-W/Ti(Sn)O 2 catalyst, especially at higher normalised contact times ( τ / τ max > 0.25), was shown to result from vanadia-like surface layer formation with high tungsten content. It was also shown that the decrease in activity as contact time decreased is connected with tungsta monolayer formation on the V-O-W hybrid crystallites composed of tungsta, V-W oxide bronze and vanadia. |
| Databáze: | OpenAIRE |
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