Improved catalytic activity and N2 selectivity of Fe–Mn–O x catalyst for selective catalytic reduction of NO by NH3 at low temperature

Synthesis and characterisation of monolithic PTFE‐modified MnOX/FeOX catalysts for selective catalytic reduction (SCR) of NOX at low temperature

“…The presence of mixed ferrian bixbyite (FeMnO 3 ), or iron manganite, has been previously identified in FeMnO X catalysts 43,44 . Previous studies, particularly those by Xia et al 19 . and Chen et al ., 7 demonstrated the importance of mixed Fe–Mn phase Fe 3 Mn 3 O 8 in synergistically improving the activity and selectivity of Fe and Mn oxides.…”

“…The presence of mixed ferrian bixbyite (FeMnO 3 ), or iron manganite, has been previously identified in FeMnO X catalysts. 43,44 Previous studies, particularly those by Xia et al 19 and Chen et al, 7 potential for Fe-Mn interaction; that is, the direct chemical interaction of these species allows for easier electron transfer, aiding in the re-oxidation of the active metal oxide phase. 12 However, this accounts for less than 10% w/w in a mixed system (Table 1), indicating its role towards enhancing the NO conversion of the catalyst may be less significant.…”

“…Water deactivation of metal oxide catalysts can be caused by the direct competition of H 2 O with NH 3 adsorption on the catalyst surface, and by decomposition to thermally stable hydroxyls at active sites 11,15 . In order to enhance the catalyst stability and poison resistance, Mn‐based multi‐metal oxides have shown potential as water vapor resistant catalysts; the addition of Ce, Co, Cu, and Fe oxides have been demonstrated to synergize with MnO X , improving its performance in the presence of water vapor whilst lowering the temperature window of the dopant 7,16–19 . Of the multi‐metal oxides, iron oxides (FeO X ), particularly α‐Fe 2 O 3 , have also been noted for their potential as LT‐SCR catalyst candidate and are attractive for their good thermal stability, low cost, and little potential environmental impact 12,20 .…”

The Effect of Tourmaline on SCR Denitrification Activity of MnOx/TiO2 at Low Temperature

“…The NH 3 -TPD test mainly analyzed and counted the distribution, types and numbers of acid sites on the surface of catalytic materials. Literature studies [13,14] showed that the area and location of the NH 3 desorption peak in the test results could effectively reflect the number and intensity of acid sites.…”

Promoted dispersion and uniformity of active species on Fe–Ce–Al catalysts for efficient NO abatement

“…It is accepted that a change for the reduction peak position can be affected by many factors, such as particle sizes, structural defects, the content of surface oxygen and phase component. 45 Based on the XPS and XRD results, it may be due to the fact that the Fe-Ce-Al-P catalyst has smaller particle sizes and better dispersion of active species, and higher surface oxygen content. Therefore the catalyst can exhibit enhanced redox ability and yield superior catalytic performance.…”