双金属氧化物掺杂对CDPF老化性能的影响
Effect of Bimetal Oxide Doping on the Aging Performance of Catalyzed DPF
张允华 1郑森 1楼狄明 1房亮 1冯谦2
作者信息
- 1. 同济大学汽车学院,上海 201804
- 2. 北京市生态环境监测中心,北京 100044
- 折叠
摘要
基于XRD、XPS、H2-TPR等理化特性表征方法与催化剂活性评价方法,研究了掺杂不同双金属氧化物催化型柴油机颗粒捕集器(CDPF)样品水热老化状态下的理化特性与催化活性.结果表明:掺杂Ce-Zr双金属氧化物的CDPF样品物相结构和晶胞参数稳定性较好,掺杂Zr-Fe双金属氧化物的CDPF样品能较好地抑制老化后载体表面贵金属分散度的降低程度.掺杂Fe-Ce和Zr-Fe的CDPF样品在高温老化过程中分散的金属氧化物会再次发生固溶而形成较多的固溶体,带来更多氧空位.经历高温水热老化后,CDPF样品的还原峰均不同程度地向高温方向迁移,其中掺杂Fe-Ce的CDPF样品还原峰迁移幅度较低,掺杂Ce-Zr的CDPF样品还原峰迁移幅度较大.掺杂Fe-Ce和Zr-Fe的CDPF样品老化后对CO的氧化活性较高,劣化程度较小,并且保持较好的NO催化选择性.掺杂Ce-Zr的CDPF样品老化后对C3H8氧化活性略有下降.
Abstract
Based on XRD,XPS,H2-TPR and other characterization methods for evaluation of physical and chemical properties and catalyst activity,the physical and chemical properties and catalytic activity of catalyzed diesel particle filter(CDPF)samples doped with different bimetal oxides under hydrothermal aging condition were studied.The results show that Ce-Zr bimetal oxide-doped sample has good stability in phase structure and cell parameters,Zr-Fe bimetal oxide-doped sample can better inhibit the dispersity of noble metal on carrier's surface.For Fe-Ce and Zr-Fe bimetal oxide-doped CDPF samples,during high-temperature aging process,the dispersed metal oxides undergo solid solution again,which will cause the formation of solid solution and more oxygen vacancies.After experiencing high-temperature hydrothermal aging process,the diffraction characteristic peaks of samples all migrate by various degrees towards the high-temperature direction.Fe-Ce bimetal oxide-doped sample shows a low degree of migration while Ce-Zr bimetal oxide-doped sample is higher.Fe-Ce and Zr-Fe bimetal oxide-doped samples after aging show higher oxidation activity of CO and low-level degradation.Ce-Zr bimetal oxide-doped sample after aging shows a slight decrease in the oxidation activity of C3H8.The catalytic activity for NO of Ce-Zr bimetal oxide-doped sample decreases slightly after high-temperature hydrothermal aging process.
关键词
双金属氧化物/催化型柴油机颗粒捕集器/理化特性/催化活性/老化性能Key words
bimetal oxide/CDPF/Physical and chemical properties/catalytic activity/aging performance引用本文复制引用
基金项目
国家自然科学基金(52206167)
中央高校基本科研业务费专项(22120220582)
出版年
2024
NETL
NSTL
万方数据