Design of CeMnCu ternary mixed oxides as soot combustion catalysts based on optimized Ce/Mn and Mn/Cu ratios in binary mixed oxides

Activity Test and Mechanism Study of 3DOM Ce0.8M0.1Zr0.1O2 (M=Cr, Sn, Fe, Co, Ni, Mn, Cu) Catalyst in the Selective Catalytic Reduction of NO by CO**

“…There is no obvious diffraction peak of ZrO 2 in 3DOM CZ catalyst, which may be due to the formation of cerium zirconium solid solution in the catalyst. [25] At the same time, no diffraction peaks related to addition metal oxides were detected in all 3DOM Ce 0.8 M 0.1 Zr 0.1 O 2 (M = Cr, Sn, Fe, Co, Ni, Mn, Cu) samples, which may be related to a small amount of adducts and their high dispersion on the catalyst surface. It is worth noting that when Ce, Zr and metal oxides are mixed, the intensity of diffraction peak of CeO 2 decreases, which indicates that there is a strong interaction between Ce, Zr and metal ions, resulting in the decrease of crystallinity of CeO 2 .…”

“…It is worth noting that when Ce, Zr and metal oxides are mixed, the intensity of diffraction peak of CeO 2 decreases, which indicates that there is a strong interaction between Ce, Zr and metal ions, resulting in the decrease of crystallinity of CeO 2 . [24,25] However, for the (111) surface of CeO 2 , compared with 3DOM CZ catalyst, 3DOM M-CZ (M = Cr, Sn, Fe, Co, Ni, Mn) catalysts shift to the left, which may be due to the lattice deformation of CeO 2 caused by metal oxide doping. In addition, compared with 3DOM CZ sample, the diffraction peaks of 3DOM M-CZ (M = Cr, Sn, Fe, Co, Ni, Mn) catalysts become wider and their strength decreases slightly, which may be influenced by nano-size effect, and the crystal size and crystallinity are reduced.…”

“…This is because SO 2 is introduced into the surface of the catalyst to form sulfate, so that the active center of the catalyst is occupied and the catalyst is slightly deactivated. [20,25] In a word, the catalyst has certain resistance to H 2 O and SO 2 .…”

Preparation of K Modified Three-Dimensionally Ordered Macroporous MnCeOx/Ti0.7Si0.3O2 Catalysts and Their Catalytic Performance for Soot Combustion

“…In recent years, considering the economy of catalyst cost, a number of rare earth oxides and transition metals have been studied for soot combustion [20,[24][25][26]. MnO x -CeO 2 mixed oxides with Mn and Ce synergistic effects have become one of the low cost and high performance catalysts [27][28][29][30]. In addition, alkali metals, especially potassium (K), exhibit excellent catalytic ability in soot combustion reaction.…”

Improved Intrinsic Activity of Ce0.5Pr0.5O2 for Soot Combustion by Vacuum/Freeze-Drying

“…Soot particulates emitted from diesel engines have caused seriously deleterious effects on human health and environment (Wei et al, 2011;Lin et al, 2013;Wei et al, 2014;Fino et al, 2016;Yu et al, 2019;Tsai et al, 2020). The catalytic combustion technique combined with diesel particulate filters (DPFs) (Kumar et al, 2012;Feng et al, 2016;Cheng et al, 2017;Ren et al, 2019;Fang et al, 2020;Jin et al, 2020;Zhao et al, 2020) has been considered as one of the most efficient ways to eliminate soot, of which the key point is to explore a highly active catalyst.…”