RH-LOADED CEO2-ZRO2 SOLID-SOLUTIONS AS HIGHLY EFFICIENT OXYGEN EXCHANGERS - DEPENDENCE OF THE REDUCTION BEHAVIOR AND THE OXYGEN STORAGE CAPACITY ON THE STRUCTURAL-PROPERTIES
P. Fornasiero et al., RH-LOADED CEO2-ZRO2 SOLID-SOLUTIONS AS HIGHLY EFFICIENT OXYGEN EXCHANGERS - DEPENDENCE OF THE REDUCTION BEHAVIOR AND THE OXYGEN STORAGE CAPACITY ON THE STRUCTURAL-PROPERTIES, Journal of catalysis, 151(1), 1995, pp. 168-177
Temperature-programmed reduction in a H-2/Ar mixture of Rh-loaded CeO2
-ZrO2 solid solutions with a ZrO2 content varying between 10 and 90% m
ol and of monoclinic, tetragonal, and cubic structures is reported. It
is shown that incorporation of ZrO2 into a solid solution with CeO2 s
trongly promotes bulk reduction of the Rh-loaded solid solutions in co
mparison to a Rh/CeO2 sample. The promotion of the bulk reduction resu
lts in high oxygen storage capacity (OSC) as measured by oxygen uptake
. A structural dependence of both reduction and oxidation processes is
observed which is attributed to a higher oxygen mobility in the cubic
structure compared to the tetragonal and monoclinic ones. (C) 1995 Ac
ademic Press, Inc.