impregnated PteCe/ZrO2 catalysts showed lower catalytic activity
than the coimpregnated one because of the formation of fixed Ce
site on the support, which results in the limited interaction between
PteCe precursors (€Ozkara-Aydınoglu et al., 2009). The hightemperature
reduction peaks of NieCe/Al2O3 was slightly lower
than that of Ni/Al2O3, indicating that the interaction between NiO
species and Al2O3 support was weakened during the process of