Abstract
An in-depth structural and analytical investigation of two 25 wt % Ce0.8Pr0.2O2/d-Al2O3 catalysts, d = 3.5 wt % SiO2, 4 wt % La2O3, is performed aimed at clarifying the origin of the differences in the evolution of their oxygen storage capacity with temperature. Using a combination of transmission and scanning transmission electron microscopy techniques, the fine details of the structural and compositional changes of the two catalysts with reduction temperature has allowed us to establish the role of SiO2 as a stabilizer of the oxygen handling properties of the Ce−Pr mixed oxide phase under high temperature reducing environments. The entire set of data clearly reveals that Pr does not fully mix with Ce during the synthesis of both catalysts, the spatial distribution of this uncombined fraction of Pr loading being in each case very different: as nanosized particles in the catalyst prepared on the SiO2-doped substrate and as a highly dispersed phase in the lanthana modified alumina catalyst. Therefore, SiO2...
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