内燃机工程2026，Vol.47Issue(4)：8-17,10.DOI:10.13949/j.cnki.nrjgc.2026.04.002
银掺杂调控锰铈催化剂的氧空位结构及碳烟燃烧性能
Regulation of Oxygen Vacancy Structure and Soot Combustion Performance of Mn-Ce Catalysts by Ag Doping
摘要
Abstract
To enhance the catalytic combustion efficiency of diesel soot particles,the oxygen vacancy structure of Mn-Ce catalysts was modulated via silver(Ag)doping,and its effect on soot combustion performance was investigated.MnOx-CeO2 composite catalysts with different Mn-to-Ce ratios(MnxCey)were prepared using the co-precipitation method,followed by loading 3％mass percentage of Ag via impregnation.Through characterization of the physicochemical properties of the catalysts and temperature-programmed oxidation experiments,the catalytic performance for soot oxidation was analyzed.The results showed that after Ag loading,the Mn33Ce66Ag catalyst exhibited a lower ignition temperature(T10=287℃)and a lower complete combustion temperature(T90=332℃),along with excellent cyclic stability,as T90 only increased to 386℃after three cycles.Characterization analysis results show that Ag doping stabilizes Ce3+through electron injection,increases the molar ratio of surface active oxygen species,and optimizes the oxygen vacancy concentration.Through H2 temperature-programmed reduction,it is verified that Ag significantly reduces the surface oxygen reduction temperature(the main reduction peak of Mn20Ce80Ag shifted from 354.2℃to 282.2℃),accelerates oxygen activation,and enhances reducibility.The results demonstrate that the synergy between Mn4+and Ce3+promotes the activation of NO/O2,while Ag improves stability by inhibiting CeO2 grain growth and enhancing metal-support interactions.关键词
锰铈氧化物/氧空位调控/碳烟燃烧/低温催化活性/柴油机/后处理Key words
Mn-Ce oxide/oxygen vacancy modulation/soot combustion/low-temperature catalytic activity/diesel engine/aftertratement分类
能源科技引用本文复制引用
李超群,何天一,田英林,王乐萌,袁世通,张盼..银掺杂调控锰铈催化剂的氧空位结构及碳烟燃烧性能[J].内燃机工程,2026,47(4):8-17,10.基金项目
碳中和与能源智联项目(2023YFE0204600) （2023YFE0204600）
国家自然科学基金青年项目(52106009) （52106009）
河北省自然科学基金面上项目(E2021502024) （E2021502024）
中央高校基本科研业务费专项项目(2024MS170) Carbon Neutrality and Energy System Transformation(CNEST)Program(2023YFE0204600) （2024MS170）
National Natural Science Foundation of China(52106009) （52106009）
Natural Science Foundation of Hebei Province(E2021502024) （E2021502024）
Fundamental Research Funds for the Central Universities(2024MS170) （2024MS170）
