SO₂-Tolerant catalytic reduction of NO_x by confining active species in TiO₂ nanotubes

Abstract

It is still a great challenge to selective catalytic reduction (SCR) of NOx in the presence of SO2. Herein, active Cu species confined in TiO2 nanotubes (TiO2 NTs) as SCR...

Protection Effect of Ammonia on CeNbTi NH3-SCR Catalyst from SO2 Poisoning

“…For cerium sulfate (Figure 4c), the bands at 1367 and 1300 cm −1 are related to the asymmetric stretching frequencies of O=S=O species [32]. The band at 1660 cm −1 is assigned to O-H stretching modes from the reaction between SO2 and surface hydroxyl groups [33,34]. As for ammonium cerium sulfate, five characteristic bands are observed in Figure 4d.…”

“…The IR spectrum of the CeNbTi that was treated in a simple SCR condition is shown in Figure 4e as the background. The band at 1617 cm −1 is assigned to adsorb H2O from the reaction between SO2 and surface hydroxyl groups [33]. The band at 965 cm −1 is attributed to characteristic vibrations of Nb=O bond in surface NbOx species [23] and the one at 1128 cm −1 is due to modes of Nb-O-Nb stretching vibration [38,39].…”

Unveiling a remarkable enhancement role by designing a confined structure Ho-TNTs@Mn catalyst for low-temperature NH3-SCR reaction

“…It is noted that the peak at 1637 cm −1 belonging to H 2 O species discovered after 7 minutes, produced from the surface OH group bonded with SO 2 , and it gradually vanished after 11 minutes. 58 Previous literature suggested that more OH groups on the surface would alleviate the sulfation of active sites, protecting the Mn sites to successfully carry on NH 3 -SCR. 59 For Ho-TNTs/ Mn, as shown in Fig.…”

Enhanced sulfur resistance by constructing MnOx–Co3O4 interface on Ni foam in the removal of benzene

“…SO 2 can react with active metal oxides via competitive adsorption to form inactive metal sulfates, resulting in blocking of the active sites. 19,20 To improve SO 2 -tolerance, one strategy is to regulate the surface electronic properties of catalysts; the other approach is to introduce an active phase as a scavenger to preferentially capture SO 2 . 21,22 Xu et al revealed that V doping into a 13Cu/γ-Al 2 O 3 catalyst exhibited acceptable SO 2 resistance of the 13Cu/γ-Al 2 O 3 catalyst for toluene oxidation owing to the synergy between Cu and V oxide.…”