Core-shell structure effect on CeO2 and TiO2 supported WO3 for the NH3-SCR process

MnFeOx@TiO2 Nanocages for Selective Catalytic Reduction of NO with NH3 at Low Temperature

“…Dong et al synthesized hollow and porous CoInO x nanocubes based on the PBAs cobalt-based MOF and SiO 2 template strategy, which exhibited excellent low-temperature oxidation performance . Previous studies have reported that catalysts with hollow porous hierarchical structure and core–shell structure generally exhibited a high specific surface area, better adsorption properties of reactants, and a synergistic effect. − Hu et al prepared a hollow core–shell structure of MnO 2 /Fe 2 O 3 bimetallic oxide and found that it exhibited good electrochemical activity . Zhao et al prepared a CoMn 1.5 O x @Ti catalyst with a core–shell structure and found that it could exhibit excellent antipoisoning performance .…”

Improvement of low-temperature NH3-SCR catalytic performance over nitrogen-doped MOx–Cr2O3–La2O3/TiO2–N (M = Cu, Fe, Ce) catalysts

“…4(e). According to previous studies, 5,49,52 the Ce 3d XPS spectra could be separated into 8 peaks and "u" and "v" were attributed to Ce 3d 3/2 and Ce 3d 5/2 , respectively. The two peaks labelled u 0 and v 0 could be assigned to Ce 3+ , with the remaining peaks of u, u 00 , u 000 , v, v 00 and v 000 belonging to Ce 4+ .…”

“…This indicated that Ti existed in Ti 4+ oxidation state. 48,49 It is observed that the binding energy of MCrLa/TiO 2 -N (M ¼ Cu, Fe, Ce) shi to lower values compared with that of CeCrLa/TiO 2 , which means that Ti 4+ partially reduces to Ti 3+ due to the nitrogen species in TiO 2 changing the electron density distribution of Ti atoms. 50 That will increase the amount of defective active site and will be more benecial to the adsorption of NH 3 and NO x species, thereby promoting to the SCR reaction.…”

Engineering yolk–shell MnFe@CeOx@TiOx nanocages as a highly efficient catalyst for selective catalytic reduction of NO with NH3 at low temperatures

“…Simultaneously, the synergistic effect produced at the shell interface can effectively prevent the agglomeration and sintering of the active components. 12,13 CeO 2 has the advantages of good redox ability and easy generation of oxygen vacancies and has been widely used. 14,15 Liu et al designed and prepared MoFe/Beta@CeO 2 core-shell catalysts.…”