Catalytic performance and hydrothermal durability of CeO2–V2O5–ZrO2/WO3–TiO2 based NH3-SCR catalysts

Promotional effect of Nb additive on the activity and hydrothermal stability for the selective catalytic reduction of NO with NH3 over CeZrO catalyst

“…However, the reaction activity of adsorbed NH 3 and nitrate species over CeNb 3.0 Zr 2 O x was higher than that over CeZr 2 O x , and both of them could participate in the NH 3 -SCR reaction according to the in-situ DRIFTS results. It was likely to conclude that the adsorbed NH 3 species could react with adsorbed nitrate to form N 2 and The hydrothermal stability of NH 3 -SCR catalysts is required in the long deNO x for practical applications, as the diesel engine exhaust temperature can reach as high as 700 • C during the regeneration process of DPF system [41]. Accordingly, the catalysts were hydrothermally aged at various temperatures for 8 h and the results are illustrated in Fig.…”

The use of ceria for the selective catalytic reduction of NOx with NH3

“…In contrast, the thermal stabilities of the oxide catalysts with CeO2-ZrO2 as the support or Ce as the main active component are generally lower than those of zeolite catalysts. This is especially true of the recently developed Cu-based small-pore zeolite catalysts [13,48]. In addition, although the combination of CeO2 and WO3 has been shown to be very effective for the NH3-SCR reaction and can form the basis for high efficiency catalysts, the high cost of WO3 implies that there is a need for reducing or eliminating WO3 in such systems.…”

“…Moreover, the Ce additive on V2O5-WO3/TiO2 could provide stronger and more active Brönsted acid sites, which were beneficial for the SCR reaction. Ceria-modified V2O5-ZrO2/WO3-TiO2 catalyst was also evaluated for the NH3-SCR of NOx in diesel engines [13]. Compared with the V2O5/WO3-TiO2 catalysts having only Zr addition, the co-addition of Ce greatly enhanced the low-temperature activity of the catalyst, but the material obviously deactivated with age.…”

“…Reproduced with permission from the RSC. [13]. In another study, it was found that the addition of ceria to an Sb-V2O5/TiO2 catalyst could enhance the total acidity and redox properties of the catalyst, leading to higher NOx conversions in a wide temperature window [14].…”

De-NOx Performance and Mechanism of Mn-Based Low-Temperature SCR Catalysts Supported on Foamed Metal Nickel

“…9,10 The V 2 O 5 -WO 3 (MoO 3 )/TiO 2 catalyst is a commonly used commercial SCR catalyst for NO x removal with an active temperature range of 300-400 °C. 11,12 However, this catalyst has many disadvantages including the toxicity of vanadium at high temperatures.13 Therefore, significant efforts should be devoted towards the development of non-vanadium catalysts for NH 3 -SCR processes. Mn-based catalysts have been studied due to their inherent environmentfriendly characteristics and excellent SCR activity at low temperatures.…”