Chromia-vanadia catalysts supported on TiO{sub 2}: Effect of composition on the physicochemical properties and catalytic performance for the selective catalytic reduction of NO with NH{sub 3}
- Univ. of Patras (Greece). Dept. of Chemistry
- Inst. of Chemical Engineering and High Temperature Chemical Processes, Patras (Greece)
Chromia-vanadia on titania catalysts containing 8 mol% (Cr + V) were prepared and tested for the selective catalytic reduction (SCR) of NO by NH{sub 3}, in excess O{sub 2}, in the temperature range 250--450 C. The physicochemical properties of the prepared catalysts as well as those of the corresponding single active phase-containing samples were investigated by specific surface area and pore volume measurements, X-ray powder analysis, UV-visible diffuse reflectance spectroscopy, laser-Raman microscopy, X-ray photoelectron spectroscopy, analytical electron microscopy, and temperature-programmed reduction experiments. The best catalytic performance was achieved by the catalyst containing 2 mol% Cr and 6 mol% V (TiCr{sub 2}V{sub 6}), while all the binary active phase-containing catalysts proved to be more active than the corresponding single active phase-containing catalysts is attributed to a synergy developed between the two active phases. This synergy is maximized in the TiCr{sub 2}V{sub 6} sample, where a new Raman band, at 971 cm{sup {minus}1}, has also been observed. This peak is attributed to isolated Cr{sup 6+} species decorated by well-dispersed V{sup 5+} species. Deposition of the chromia phase on the titania surface stabilizes the texture of the final catalysts against changes provoked by deposition of the vanadia phase.
- OSTI ID:
- 354379
- Journal Information:
- Journal of Catalysis, Vol. 184, Issue 1; Other Information: PBD: 15 May 1999
- Country of Publication:
- United States
- Language:
- English
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