Enhanced activity of vanadia supported on microporous titania for the selective catalytic reduction of NO with NH 3 : Effect of promoters

• Published in: Chemosphere (Oxford) Vol. 275; p. 130105
• Main Authors: Jeon, Se Won, Song, Inhak, Lee, Hwangho, Kim, Do Heui
• Format: Journal Article
• Language: English
• Published: England 01-07-2021
• Subjects: Vanadium oxide catalyst; Microporous TiO; Promoter effects; NH-Selective catalytic reduction
• ISSN: 1879-1298

Vanadium oxide-based catalysts are considered a promising catalyst for selective catalytic reduction (SCR) of NO with NH
, which is an effective NO
removal technology. As environmental issues have garnered more attention, however, improvements to vanadium-based SCR catalysts are strongly required. In a previous study, we found that vanadium oxide on microporous titania as a support (V/MPTiO
) has certain advantages, such as improved thermal stability and more suppressed N
O formation, over the use of conventional nanoparticle titania (DT-51) as a support. In this study, widely used promoters, such as W, Sb, and Mo, were added to V/MPTiO
to investigate whether they have promoting effects on V/MPTiO
as well. Among these promoters added catalysts, the W and Mo were found to have significant promoting effects on the enhancement of deNO
activities at low temperatures, while the addition of Sb to V/MPTiO
tended to have a negative effect on the SCR activity. Based on the characterizations, including laser Raman, H
-temperature programmed reduction (H
-TPR), and in situ diffuse reflectance infrared Fourier transform (in situ DRIFT) analysis, we found that the addition of W and Mo increased the degree of polymerization in V/MPTiO
, which generated more reactive vanadia species. Hence, such changes, resulting from the addition of W and Mo promoters to V/MPTiO
, yielded enhanced catalytic activity at low temperatures.