The study of deNOx catalyst in low temperature using nano-sized supports

The control of valence state: How V/TiO2 catalyst is hindering the deactivation using the mechanochemical method

“…However, V 2p peak in this study showed the existence of V 4+ and V 3+ besides V 5+ . This supports Lee et al's [12] opinion that when vanadium is impregnated with TiO 2 support TiO 2 and vanadium are formed non-stoichiometrically. That is, vanadium has a stable pentavalent oxidation value, but it forms V 3+ through oxygen combination, and it is known that activation energy was much lower in vanadia containing V 3+ than vanadia where V 5+ is dominant [13].…”

The characterization and activity of F-doped vanadia/titania for the selective catalytic reduction of NO with NH3 at low temperatures

“…Recently, efforts have been made to promote low-temperature SCR performance of vanadia catalysts through the use of promoters such as 1%CrO 3 -6%V 2 O 5 /TiO 2 [3] and 1%MO x (M = Fe, Mn, Cu or Cr)-3%V 2 O 5 /mesoporous carbon-coated monoliths [6]. Other approaches have changed the support to materials such as 3-8%V 2 O 5 /carbon-coated monoliths [7][8][9] [13], 3-7%VO x (x < 2.5)/TiO 2 (supports obtained from different companies) [14]. However, these catalysts were unable to reduce the vanadia loading.…”

Catalytic Reduction of NOX Over TiO2–Graphene Oxide Supported with MnOX at Low Temperature

“…Oxygen-containing groups present in GO provide an abundance of active sites for connecting GO to TiO 2 particles. This result suggests that, -OH on the surface of TiO 2 particle may reacts with -COOH and C-OH functional group, the surface is formed GO O=C-O-Ti, and C-O-Ti bond respectively by esterification and dehydration reactions, to achieve a closer integration [28]. XPS analysis detected the atomic surface compositions of fresh 9 % Mn/ TiO 2 -0.8 % GO catalysts.…”

“…6c, d, [29] before. The variety of MnO X species with different valences present in the catalyst, especially non-stoichiometric MnO X /Mn, activated electron mobility in the catalyst, which favors the redox reaction of the catalyst and further increases the removal rate of NO X in SCR reaction [28]. In Fig.…”