摘要
基于浸渍法制备了不同Mn、K、Ag和Zr掺杂的Ce基催化剂,利用热重实验对水热老化处理前后Ce基催化剂的PM氧化性能进行了评价,通过对比综合燃烧指数S和燃烧稳定度指数R_(w),分析了新鲜/水热老化Ce基催化剂的催化活性变化规律,揭示了基于Mars-Van-Krevelen机制的PM氧化过程。结论表明,与PU相比,Ce基催化剂提高了PM氧化性能,不同金属改性的Ce基催化剂活性从高到低为Ag>K>Mn>Zr。随着掺杂量增加,仅K/CeO_(2)催化剂的综合燃烧指数S及燃烧稳定度R_(w)下降。水热老化处理后,Zr/CeO_(2)催化剂表现出最好的抗水热老化性能,综合燃烧指数S及燃烧稳定度R_(w)保持稳定(<5%),Ce基催化剂抗水热老化性能从高到低为Zr>Mn>Ag>K。
Different Mn,K,Ag and Zr doped Ce-based catalysts were prepared based on the impregnation method,and the PM oxidation performance of Ce-based catalysts before and after hydrothermal aging was investigated using thermogravimetric experiments,the catalytic activity change pattern of fresh/hydrothermal aging Ce based catalysts was analyzed by comparing the comprehensive combustion index S and combustion stability index R_(w),revealing the PM oxidation process based on the Mars-Van-Krevelen mechanism.Compared with PU,Ce-based catalyst increases the PM oxidation performance and the catalytic activity of various metal modified Ce-based catalysts ranked from high to low was Ag>K>Mn>Zr.With the metal doping increased,only the comprehensive combustion index S and combustion stability index R_(w)of K/CeO_(2) catalysts decreased.After hydrothermal aging treatment,the Zr/CeO_(2) catalysts showed the best hydrothermal aging resistance,the comprehensive combustion index S and combustion stability index R_(w)remained stable(<5%).The Ce-based catalysts were ranked from high to low in terms of hydrothermal aging resistance as Zr>Mn>Ag>K.
作者
李宗霖
王攀
吴钢
窦成龙
雷利利
LI Zonglin;WANG Pan;WU Gang;DOU Chenglong;LEI Lili(School of Automotive and Traffc Engineering,Jiangsu University,Zhenjiang 212013,China;College of Automotive and Mechanical Engineering,Changsha University of Science&Technology,Changsha 41000,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2022年第8期2080-2089,共10页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.52076104)
四川省新能源汽车智能控制与仿真测试技术工程研究中心(No.XNYQ2021-002)。
关键词
PM
水热老化
Ce基催化剂
金属改性
热重实验
PM
hydrothermal aging
Ce-based catalyst
metal modification
thermogravimetric analysis
