One step citric acid-assisted synthesis of Mn-Ce mixed oxides and their application to diesel soot combustion

Simultaneous Removal of Soot and NOx from Diesel Engines over Three-Dimensionally Ordered Macroporous ZSM-5-Supported MMnOδ Catalysts

“…Because the ionic radii of Mn n + (+3:0.064 nm and + 4:0.053 nm) are quite different from those of Ce n + (3+: 0.114 nm and 4+: 0.094 nm) and Pr n + (3+: 0.099 nm and 4+: 0.085 nm), Mn was considered to be doped into the CeO 2 and Pr 6 O 11 lattices. As shown in Figure B, the peak positions were shifted obviously toward higher angles, indicating a decrease in crystal plane spacing resulting from the replacement of a larger element ionic radius by a smaller ionic radius. − Based on the above discussion, it can be speculated that the active components of 3DOM ZSM-5-supported CeMnO δ and PrMnO δ catalysts with the same preparation method also exist on the catalyst surface in the form of Mn-doped cerium oxide or praseodymium oxide. However, due to the uniform dispersion of the active components, no obvious characteristic diffraction peaks were found in the X-ray diffraction patterns of 3DOM ZSM-5-supported CeMnO δ and PrMnO δ .…”

The research on CO oxidation over Ce–Mn oxides: The preparation method effects and oxidation mechanism

“…And the peak position of CO-TPR at 409.6 ℃ (C-1:8) > 319.2 ℃ (H-1:8) > 242.4 ℃ (CH-1:8). For the CH-1:8 sample, it is also observed that the low temperature reduction peaks had shifted to the left and that the second peak of the CO-TPR profile had widened in the comparison of H 2 -TPR, suggesting the higher mobility and accessibility of CO than H 2 through the CH-1:8 surface (Sacco et al, 2022).…”

Modification of SmMn2O5 Catalyst with Silver for Soot Oxidation: Ag Loading and Metal–Support Interactions

“…It has been reported that many non-noble metal oxides including Ce-based oxides [9,10], transition metal oxides [11][12][13][14], and alkaline metal oxides [8,15] are effective for soot oxidation. Among them, Mn-based metal oxides are one of the most promising soot oxidation catalysts due to their abundance, non-toxicity, and high activity.…”