Structural Properties and Thermal Stability of Ceria-Zirconia and Related Materials

Effect of preparation procedure on the formation of nanostructured ceria–zirconia mixed oxide catalysts for ethyl acetate oxidation: Homogeneous precipitation with urea vs template-assisted hydrothermal synthesis

“…Note, that for the studied materials the unit cell parameters of both Fm-3m and P4 2 /nmc phases differ from the reported ones for pure CeO 2 (a = 5.41134 Å, PDF 34-0394 and ZrO 2 (a = 3.5984 Å, c = 5.185 Å, PDF 72-7115), respectively (Table 5). Taking into account the smaller ionic radius of Zr 4+ (0.084 nm) compared to Ce 4+ (0.097 nm), incorporation of Zr into ceria lattice and vice versa can be concluded, in accordance with [27,50]. The more significant change in a 0 lattice parameter for the hydrothermally obtained materials evidences higher ability for formation of solid solution with cubic structure even at higher ceria content.…”

Gold supported on metal-doped ceria catalysts (M=Zr, Zn and Fe) for the preferential oxidation of CO (PROX)

“…For example, Ce and Zr oxides form solid solution in the whole range of compositions [19][20][21][22]. In the case of Ce-Fe systems, although the solubility of iron into the CeO 2 network is low, the formation of a solid solution has been demonstrated [10] but some works also report the segregation of iron oxides when the amount of iron is above a certain value [11,23].…”

Heterogeneous environmental catalysis – a gentle art: CeO2–ZrO2 mixed oxides as a case history

“…OSC values measured under similar experimental conditions (isothermal reduction with H 2 ) were, respectively, 750 mmol O 2 /g catalyst for an ordered and homogeneous Ce 0.5 Zr 0.5 O 2 [66] and 470 mmol O 2 /g catalyst for the best nanophase-domain type of Ce 0.5 Zr 0.5 O 2 material [64]. Generally speaking, the presence of compositional nanosized non-homogeneities favours accelerated phase segregation for calcination at and above 1273 K, allowing their detection by conventional XRD technique [61,67,68]. Importantly, the CeO 2 -rich component (about 80 mol.%), which is formed by the phase segregation, is a sinterable material compared to other Ce x Zr 1Àx O 2 compositions [69]; this depresses the dynamic-OSC [48].…”