The selective catalytic reduction of NO{sub x} with NH{sub 3} over titania supported rhenium oxide catalysts
Titania supported vanadium oxide catalysts have been demonstrated to be very efficient catalysts for the selective reduction of NO{sub x} with NH{sub 3} and have found widespread industrial application for the control of NO{sub x} emissions from stationary sources. Characterization studies have demonstrated that supported vanadium oxide catalysts consist of a two-dimensional metal oxide overlayer on the oxide support substrate. The surface vanadia overlayer consists of redox and acid sites that are critical for the efficient selective catalytic reduction of NO{sub x} with NH{sub 3}. The titania support is superior to other oxide supports (e.g., alumina, silica, etc.) for the SCR of NO with NH{sub 3} primarily because of its ability to simultaneously enhance the redox properties of the surface vanadia species, stabilize surface acid sites in the surface vanadia overlayer, and remain resistant to corrosive gases such as SO{sub 2}/SO{sub 3} that are typically present in industrial environments. Consequently, there have been numerous studies investigating the SCR of NO with NH{sub 3} with other surface metal oxides on titania: MoO{sub 3}, WO{sub 3}, CrO{sub 3},Nb{sub 2}O{sub 5}, and SO{sub x}. The above supported metal oxide catalyst systems, however, have generally been less active and selective for the SCR of NO with NH{sub 3} than the efficient titania supported vanadia catalyst. 31 refs., 1 fig., 1 tab.
- DOE Contract Number:
- FG02-93ER14350
- OSTI ID:
- 391007
- Journal Information:
- Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 2 Vol. 160; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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