Naslov
Structural sensitivity of NO decomposition over a V-O-W/Ti(Sn)O2 catalyst

Autori
Banaś, Joanna ; Tomašić, Vesna ; Wesełucha-Birczyńska, A. ; Najbar, Mieczysława

Izvornik
Catalysis today (0920-5861) 119 (2007), 1-4; 199-203

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
rutile-supported vanadia-tungsta catalyst ; nitrogen oxide decomposition ; surface species structure

Sažetak
NO decomposition at 673 K as a function of contact times over a V-O-W/Ti(Sn)O2 catalyst obatined 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)O2 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)O2 catalyst, especially at higher normalised contact times 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 bronze and vanadia.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

Napomena
Rad je prezentiran na skupu "Air Pollution Abatement Catalysis (APAC) Symposium", održanom od 21.–24.09.2005., Krakov, Poljska.

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