Novel Cs-Mg-Al mixed oxide with improved mobility of oxygen species for passive NO_(x)adsorption  

作　　者：Yimeng Yin Chizhong Wang Lei Qiu Xing Li Feilin Zhao Jie Yu Jinchi Han Huazhen Chang 

机构地区：[1]School of Environment and Natural Resources,Renmin University of China,Beijing,100872,China [2]Department of Earth System Science,Tsinghua University,Beijing,100084,China

出　　处：《Green Energy & Environment》2024年第10期1581-1591,共11页绿色能源与环境（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51938014,Grant No.22176217,Grant No.22276215);the Fundamental Research Funds for the Central Universities and the Research Funds of Renmin University of China(No.22XNKJ28).

摘　　要：The development of passive NO_(x)adsorbers with cost-benefit and high NO_(x)storage capacity remains an on-going challenge to after-treatment technologies at lower temperatures associated with cold-start NO_(x)emissions.Herein,Cs_(1)Mg_(3)Al catalyst prepared by sol-gel method was cyclic tested in NO_(x)storage under 5 vol%water.At 100°C,the NO_(x)storage capacity(1219 μmol g^(-1))was much higher than that of Pt/BaO/Al_(2)O_(3)(610 μmol g^(-1)).This provided new insights for non-noble metal catalysts in low-temperature passive NO_(x)adsorption.The addition of Cs improved the mobility of oxygen species and thus improved the NO_(x)storage capacity.The XRD,XPS,IR spectra and in situ DRIFTs with NH3 probe showed an interaction between CsO_(x)and AlO_(x)sites via oxygen species formed on Cs_(1)Mg_(3)Al catalyst.The improved mobility of oxygen species inferred from O2-TPD was consistent with high NO_(x)storage capacity related to enhanced formation of nitrate and additional nitrite species by NO_(x)oxidation.Moreover,the addition of Mg might improve the stability of Cs_(1)Mg_(3)Al by stabilizing surface active oxygen species in cyclic experiments.

关 键 词：Passive NO_(x)adsorber Low-temperature NO_(x)storage Cesium O_(x)ygen mobility 

分 类 号：X701[环境科学与工程—环境工程]