La2O3掺杂对CDPF老化性能的影响
Effect of La2O3 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等表征方法以及活性评价方法,研究了不同浓度La2O3掺杂CDPF样品水热老化状态下的理化特性与催化活性.结果表明:随着La2O3掺杂浓度增加,CDPF老化样品衍射特征峰位向大角度偏移程度以及结晶度均呈先降低后增加的趋势.La2O3掺杂能够较好地抑制样品在高温水热老化过程中的烧结和畸变,并且可以有效抑制活性位数量的减少,使CDPF表面Pt原子浓度基本保持不变,对CO、C3H8和NO催化性能的劣化率降低,并且随掺杂浓度的增大,CDPF抗老化性能有增强的趋势.
Abstract
Based on XRD,XPS,H2-TPR and other characterization methods and activity evaluation methods,the physical and chemical properties and catalytic activity of CDPF(catalyzed DPF)samples doped with different concentrations of La2O3 under hydrothermal aging condition were studied.The results show that with the increase in La2O3 doping concentration,the diffraction characteristic peak shifts a large angle and the crystallinity of CDPF aging samples show a trend of decreasing and then increasing.La2O3 doping can better inhibit the sintering and distortion of samples during hydrothermal processing and can effectively inhibit the reduction of active quantity,so that the concentration of Pt atoms on the surface of CDPF remains basically unchanged,and the degradation rate of CO,C3H8 and NO catalytic performance decreases.With the increase in La2O3 doping concentration,the CDPF tends to reverse the trend of aging.
关键词
CDPF催化剂/La2O3/理化特性/催化活性/劣化性能Key words
CDPF catalyst/La2O3/physical and chemical properties/catalytic activity/deterioration 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