Effect of high temperature pretreatment on the thermal resistance properties of Pd/CeO2/Al2O3 close-coupled catalysts
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- 作者：Mulan HUANG (黄木兰)a ; Suning WANG (王苏宁)b ; Lan LI (兰 丽)a ; Hailong ZHANG (张海龙)b ; Zhonghua SHI (史忠华)a ; c ; d ; Yaoqiang CHEN (陈耀强)a ; c ; d ; nic7501@scu.edu.cn
- 关键词：pretreatment temperature ; C3H8 oxidation ; anti-aging properties ; close-coupled catalyst ; rare earths
- 刊名：Journal of Rare Earths
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：35
- 期：2
- 页码：149-157
- 全文大小：3801 K
- 卷排序：35
文摘
Fresh Pd/CeO2/Al2O3 close coupled catalyst was prepared by the stepwise impregnation method and calcined at 550 °C for 3 h, which was then pretreated at 700, 800, and 900 °C for 3 h, respectively. Finally, these pretreated catalysts were aged at 1000 °C for 3 h to study their anti-aging properties. The catalytic activities of the catalysts were investigated detailedly, and the results showed that the catalyst pretreated at 800 °C before aging treatment possessed the best anti-aging performance for C3H8 oxidation. XRD and XPS results indicated that well-crystallized CeO2 particles were formed during calcinations at 800 °C, which made CeO2 an effective promoter. HRTEM revealed that Pd particles found on the edge of CeO2 over the aged catalyst pretreated at 800 °C were relatively smaller than those over the catalysts without pretreatment. H2-TPR and XPS results also implied that the interaction between well-crystallized CeO2 and Pd suppressed the deactivation of PdO sites and further enhanced the catalytic performance.