Effect of high temperature pretreatment on the thermal resistance properties of Pd/CeO2/Al2O3 close-coupled catalysts

Structure-activity relationship in Pd/CeO2 methane oxidation catalysts

“…Other experimental techniques corroborate XPS results, showing a beneficial effect of ceria in maintaining Pd in oxidized form and/or shifting PdO decomposition to higher temperature [14,16,38,43,49,57]. The stabilization of oxidized palladium by ceria is often observed also after aging or reducing treatments [14,16,28,45,46,50,52,53,[58][59][60][61], post reaction [22,44,62,63], or during in situ or operando experiments [14,32,38,52,[64][65][66] even in oxygen deficient atmosphere typical of stoichiometric (or rich) operation [14,38,66].…”

Revealing the intrinsic nature of Ni-, Mn-, and Y-doped CeO2 catalysts with positive, additive, and negative effects on CO oxidation using operando DRIFTS-MS

“…36 The peak areas of Ce 3+ and Ce 4+ were used to calculate the atomic ratio of Ce 3+ /(Ce 3+ + Ce 4+ ), since a higher Ce 3+ /(Ce 3+ + Ce 4+ ) ratio is beneficial to the formation of surface oxygen vacancies and the improvement of the catalytic activity. 37,38 The Ce 3+ /(Ce 3+ + Ce 4+ ) ratio of the Ni–CeO 2 catalyst was 13%, higher than that of the other catalysts, implying the Ni–CeO 2 catalyst had the highest number of oxygen vacancies (Table 2). The Ce 3+ /(Ce 3+ + Ce 4+ ) ratio of Y–CeO 2 catalyst was 10.0%, lower than that of the other catalysts, implying the Y–CeO 2 catalyst had the fewest oxygen vacancies.…”

Tuning Single‐atom Pt1−CeO2 Catalyst for Efficient CO and C3H6 Oxidation: Size Effect of Ceria on Pt Structural Evolution

“…Pure CeO 2 support is less stable than widely used Al 2 O 3 for the typical application temperature window. [11] γ-Al 2 O 3 has been used to support some metal oxides such as CeO 2 and TiO 2 to improve the thermal stability of the latter. [12] After harsh aging treatment, the overall surface area of these metal oxides can be better maintained in such a fashion.…”

“…With the goal of surviving high‐temperature spikes encountered in automotive exhaust, a promising Pt/CeO 2 catalyst must show excellent thermal stability at elevated temperatures. Pure CeO 2 support is less stable than widely used Al 2 O 3 for the typical application temperature window [11] . γ‐Al 2 O 3 has been used to support some metal oxides such as CeO 2 and TiO 2 to improve the thermal stability of the latter [12] .…”