In
this paper, the hydrothermal stability and catalytic activity
of Pd@Ce0.5Zr0.5O2/Al2O3 catalyst with a core–shell structure were investigated
for automobile three-way reactions and compared with those of Pd/Al2O3, Pd@CeO2/Al2O3, and Pd@ZrO2/Al2O3 catalysts. TEM,
HRTEM, and EDS mapping analyses showed that the core–shell
structure of Pd@Ce0.5Zr0.5O2 nanoparticles
was intact after the hydrothermal treatment at 1050 °C for 5
h. Meanwhile, CO–DRIFT results suggested that the interface
of Pd core and Ce0.5Zr0.5O2 shell
acted as the active sites in the reaction of three-way catalysts.
Additionally, XPS, FT-IR, and CO–DRIFT analyses demonstrated
that a large amount of OH groups were present on the surface of Pd@Ce0.5Zr0.5O2/Al2O3 catalyst, which could accelerate the decomposition of carbonate
species and reduce the activation energy of the catalytic reaction.
This was an important reason for the Pd@Ce0.5Zr0.5O2/Al2O3 catalyst to keep the high
catalytic activity after aging at high temperature.
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