Interfacial confinement effect induced by pre-sulfurization for promoting SO2 tolerance of MnFe-TOS catalyst in low temperature NH3-SCR reaction

Rationally Designed Confined Structure Ce-Mn-TNTs Catalyst for Low-Temperature NH3-SCR Reaction with Superior Activity and H2O/SO2 Tolerance

“…2 It was found that the wave numbers of the Ce-Mn-TNT and Ce-TNTs@Mn catalysts blue-shifted by 8 cm −1 from 154 cm −1 to 162 cm −1 , which was caused by lattice distortion of TiO 2 , resulting in the formation of more surface lattice defects in the anatase phase. 20 Interestingly, a similar phenomenon was also found in the XPS spectrum of Ti 2p. In Figure 2c, we clearly observed that the peak of Ti 4+ of the Ce-Mn-TNT catalyst moved to the lower binding energy by 0.1 eV compared with the Ce-TNT catalyst.…”

“…As shown in Figure b, the strong peak at 154 cm –1 ( E g ) and the four weak peaks at 207 cm –1 ( E g ), 406 cm –1 (B 1g ), 523 cm –1 (A 1g ), and 642 cm –1 ( E g ) could all be well attributed to the anatase phase of TiO 2 . , Here, E g is the symmetric tensile vibration of O–Ti–O, A 1g belonged to the asymmetric bending vibration of O–Ti–O, B 1g belonged to the symmetric bending vibration of O–Ti–O . It was found that the wave numbers of the Ce-Mn-TNT and Ce-TNTs@Mn catalysts blue-shifted by 8 cm –1 from 154 cm –1 to 162 cm –1 , which was caused by lattice distortion of TiO 2 , resulting in the formation of more surface lattice defects in the anatase phase . Interestingly, a similar phenomenon was also found in the XPS spectrum of Ti 2p.…”

“…In Figure 9c, it was found that the adsorption of NO on the Ce-Mn-TNT catalyst was inhibited, and only the peaks of adsorbed state NO 2 , linear nitrite, and bidentate nitrite were detected at 1622, 1442, and 1346 cm −1 . However, the peak at 1197 cm −1 belonged to SO 4 2− , 20 which gradually increased with the time accumulation. Besides, the desorption of NH 3 (NO + SO 2 ), as shown in Figure S4, indicated that with the increase of temperature, NH 4 + was gradually converted into NH 3 , while unstable nitrates and nitrites produced at low + ) adsorbed on the catalyst surface was completely consumed.…”