Three-Way Catalytic Acitvities And Thermal Stabilities Of Pd@Sio2/Ce0.4zr0.6o2 Nanocatalysts With Core-Shell Structure

A New type of Pd@SiO2/Ce0.4Zr0.6O2 three-way nanocatalyst with core-shell structure was prepared from the colloidal Pd nanoparticles. For comparison, the corresponding reference catalyst Pd/Ce0.4Zr0.6O2 was synthesized. The catalysts were characterized by powder X-ray diffraction(XRD), transmission electron microscopy (TEM), nitrogen gas adsorption-desorption and temperature programmed reduction by H-2(H-2-TPR). The three-way catalytic activities and the thermal stabilities of the two kinds of catalysts with different structure were investigated. It was found that the silica shell could prevent the aggregation of Pd nanoparticles. At the same time, the silica could inhibit the redispersion of Pd species so that the loss of precious metal Pd was reduced. All results showed that the Pd@SiO2/Ce0.4Zr0.6O2 nanocatalyst with core-shell structure possessed good three-way catalytic activities and high thermal stabilities.