Abstract
Three Pt/CeO 2 -ZrO 2 -La 2 O 3 diesel oxidation catalysts were prepared by two different routes and characterized by X-ray diffraction, N 2 adsorption, temperature-programmed reduction, temperature-programmed desorption, X-ray photoelectron spectroscopy, and infrared spectroscopy. The synthesis procedure affected the structure, texture, sulfur resistance, and catalytic activity of the catalysts. Sulfur poisoning increased the light-off temperature of all the catalysts, but the Pt/CeO 2 -ZrO 2 -La 2 O 3 catalyst prepared by depositing ZrO 2 and La 2 O 3 on the surface of CeO 2 nanoparticles exhibited better sulfur tolerance and catalytic activity with simulated diesel emission due to the high dispersion of Pt on CeO 2 -ZrO 2 -La 2 O 3 oxide with a Zr-rich surface. ：采用两种方法制备了三种 Pt/CeO 2 -ZrO 2 -La 2 O 3 柴油车尾气氧化催化剂, 并用 X 射线衍射、N 2 物理吸附、程序升温还原、程序升温脱附、X 射线荧光光谱和红外光谱等方法对其进行了表征. 结果发现, 制备方法对催化剂的结构、织构、抗硫性能及催化性能的影响非常大. 对其进行硫中毒, 导致起燃温度明显升高. 将 ZrO 2 和 La 2 O 3 沉积在 CeO 2 表面所制得的 Pt/CeO 2 -ZrO 2 -La 2 O 3 催化剂表现出更高的抗硫及催化氧化性能, 这主要归功于 Pt 在富 Zr 载体表面具有更高的分散性. The Pt loaded on CeO 2 -ZrO 2 -La 2 O 3 prepared by deposition-precipitation methods (a and b) exhibits excellent sulfur tolerance and catalytic activity compared to co-precipitation methods (c and d) due to the better dispersion.
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