The synthesis and studies of crystal/local structures and morphology of hydrated molybdenum oxides

Hexavalent Metal Cations Doped into Ceria Inducing the Formation of Binuclear Sites Ce3+–O–Ce3+ to Boost the NH3-SCR Reaction

“…As shown in Figures S3 and a, the Raman spectra indicated that both CeO 2 and Ce 0.98 Mo 0.02 O x catalysts had a distinct vibrational peak near ∼464 cm –1 associated with the F 2g vibrational mode of the cubic fluorite structure. ,, It should also be noted that the vibrational peak near ∼464 cm –1 for the Ce 0.98 Mo 0.02 O x catalyst was weaker and shifted to a lower frequency compared to that of pristine CeO 2 , which may be due to the doping of lighter Mo atoms and subsequent contraction of the CeO 2 lattice . In addition, the vibrational peaks attributed to MoO at 877 and 961 cm –1 for the Ce 0.98 Mo 0.02 O x catalyst indicated the presence of Mo species in the catalyst. , Furthermore, it can be seen from the UV–vis DRS results shown in Figure b that the absorption edge of the Ce 0.98 Mo 0.02 O x catalyst was significantly red-shifted from 442 to 476 cm –1 compared to that of CeO 2 , possibly resulting from the migration of Mo single atoms into the CeO 2 lattice and the stronger interaction between Mo and the CeO 2 matrix, leading to a decrease in symmetry and consequent additional lattice stress. , Such results further confirm the successful doping of the Mo species, which is in good accordance with the results of Raman spectra.…”

“…30 In addition, the vibrational peaks attributed to Mo�O at 877 and 961 cm −1 for the Ce 0.98 Mo 0.02 O x catalyst indicated the presence of Mo species in the catalyst. 31,32 Furthermore, it can be seen from the UV−vis DRS results shown in Figure 2b that the absorption edge of the Ce 0.98 Mo 0.02 O x catalyst was significantly red-shifted from 442 to 476 cm −1 compared to that of CeO 2 , possibly resulting from the migration of Mo single atoms into the CeO 2 lattice and the stronger interaction between Mo and the CeO 2 matrix, leading to a decrease in symmetry and consequent additional lattice stress. 33,34 Such results further confirm the successful doping of the Mo species, which is in good accordance with the results of Raman spectra.…”