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Investigation on properties of a novel ceria-zirconia-praseodymia solid solution and its application in Pd-only three-way catalyst for gasoline engine emission control

机译:新型二氧化铈-氧化锆-前列腺素固溶体的性能研究及其在汽油机控制中仅Pd三元催化器中的应用

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摘要

Different contents of praseodymia were introduced to modify Ce_(0.2)Zr_(0.8)O_2 (CZ) and the supported Pd-only three-way catalysts before and after aging were also prepared. The influence of praseodymia doping on the structural/textural properties of CZ and the effect on the three-way catalytic activity were investigated. Structural and textural characterizations reveal that the addition of praseodymia results in the formation of Ce-Zr-Pr ternary solid solution (CZP) with higher specific surface area, better thermal stability and larger oxygen storage capacity (OSC) than that of CZ. It is more credible that Zr is replaced by Pr during the formation of CZP. The modified Pd-only three-way catalysts present relatively higher catalytic activity to the main target pollutants in gasoline engine exhaust and exhibit wider air/fuel operation window due to the improved properties of CZP.
机译:引入了不同含量的痛觉障碍来修饰Ce_(0.2)Zr_(0.8)O_2(CZ),并制备了老化前后的仅负载型Pd三元催化剂。研究了掺杂对CZ结构/结构性能的影响以及对三向催化活性的影响。结构和结构表征表明,比起CZP,添加增加了Ce-Zr-Pr三元固溶体(CZP)的形成,该固溶体具有更高的比表面积,更好的热稳定性和更大的储氧能力(OSC)。更可靠的是,在CZP的形成过程中Zr被Pr取代。改性的仅含钯的三元催化剂对汽油发动机废气中的主要目标污染物具有相对较高的催化活性,并且由于CZP的性能提高而具有较宽的空气/燃料操作窗口。

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