Oxygen Storage Capacity and Adsorptive Property of Praseodymium Oxides

方明¹，万颖²，刘毅廷¹，马建新³

(1.Institute for Environment and Sustainable Development, Hong Kong University of Science and Technology, Hong Kong, China;
2.Department of Chemistry, Shanghai Normal University, Shanghai 200234, China;
3.Clean Energy Automotive Engineering Center, Tongji University, Shanghai 200092, China)

Abstract:Oxygen storage and adsorptive properties of praseodymium oxides were investigated by pulse experiments and temperature-programmed desportion/reduction (TPD/TPR) experiments. Pr2O3 possesses the similar oxygen storage properties to CeO 2, and its dynamic oxygen storage capacity is 14.9 μmolg-1. The studies on TPD of O2, H2O and CO and TPR show that Pr2O3 provides more active sur face oxygen species and at a lower temperature than CeO2. It is suggested that Pr2O3 can be a well candidate as an oxygen storage component in automobile three-way catalyst.

Key words:catalitic chemistry; praseodymium oxides; oxygen storage capacity; TPD-TPR; autocatalyst; rare earths;

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