Performance of Pd/CeO_2-ZrO_2-Al_2O_3 catalyst for motorcycle
来源期刊：JOURNAL OF RARE EARTHS2009年第5期
论文作者：ZHANG Xiaoyu GONG Maochu ZHAO Ming CHEN Shanhu CHEN Yaoqiang
Key words：CeO_2-ZrO_2-A1_2O_3; palladium; TWC; H_2-TPR; motorcycle; rare earths;
Abstract: The Pd-only catalysts for motorcycle were prepared by impregnating CeO_2-ZrO_2-Al_2O_3 and CeO_2-ZrO_2+Al_2O_3 with PdCl_2 aque-ous solution and characterized by X-ray diffraction (XRD), oxygen storage capacity (OSC) and H_2-temperature-programmed reduction (H_2-TPR) methods. The XRD result indicated that the CeO_2-ZrO_2-Al_2O_3 compound prepared by co-precipitation formed a single solid solu-tion and had good thermal stability, and Pd phase was not observed in all catalysts. The TPR results showed that the reduction temperature of Pd/CeO_2-ZrO_2-Al_2O_3 catalyst was lower than that of Pd/CeO_2-ZrO_2+Al_2O_3 catalyst whether they were fresh or aged catalysts. The Pd/CeO_2-ZrO_2-Al_2O_3 exhibited high three-way catalytic activity at low temperature, high thermal stability, and wide working window, sug-gesting a great potential for applications.
ZHANG Xiaoyu1，GONG Maochu1，ZHAO Ming1，CHEN Shanhu1，CHEN Yaoqiang1
(1.Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry, Sichuan University, Chengdu 610064, China)
Abstract:The Pd-only catalysts for motorcycle were prepared by impregnating CeO_2-ZrO_2-Al_2O_3 and CeO_2-ZrO_2+Al_2O_3 with PdCl_2 aque-ous solution and characterized by X-ray diffraction (XRD), oxygen storage capacity (OSC) and H_2-temperature-programmed reduction (H_2-TPR) methods. The XRD result indicated that the CeO_2-ZrO_2-Al_2O_3 compound prepared by co-precipitation formed a single solid solu-tion and had good thermal stability, and Pd phase was not observed in all catalysts. The TPR results showed that the reduction temperature of Pd/CeO_2-ZrO_2-Al_2O_3 catalyst was lower than that of Pd/CeO_2-ZrO_2+Al_2O_3 catalyst whether they were fresh or aged catalysts. The Pd/CeO_2-ZrO_2-Al_2O_3 exhibited high three-way catalytic activity at low temperature, high thermal stability, and wide working window, sug-gesting a great potential for applications.
Key words:CeO_2-ZrO_2-A1_2O_3; palladium; TWC; H_2-TPR; motorcycle; rare earths;
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