A novel Ce_(0.485)Zr_(0.485)Y_(0.03)O_(2) composite oxide with surface doping of Y and its application in Pd-only three-way catalyst  

作　　者：Zheng Zhao Wei-Xin Zhao Yong-Qi Zhang Mei-Sheng Cui Yong-Ke Hou Dong-Ming Chen Juan-Yu Yang Zong-Yu Feng Xiao-Wei Huang 

机构地区：[1]National Engineering Research Center for Rare Earth,Grirem Advanced Materials Co.Ltd.,GRINM Group Corporation Limited,Beijing,100088,China [2]Griem Hi-Tech Co.Ltd.,Langfang,065000,China [3]Rare Earth Functional Materials(Xiong’an)Innovation Venter Co.Ltd.,Baoding,071700,China

出　　处：《Rare Metals》2024年第2期749-757,共9页稀有金属（英文版）

基　　金：This study was financially supported by the National Natural Science Foundation of China(No.52204376);Youth Foundation of Hebei Province(No.E2022103007);Young Elite Scientists Sponsorship Program by CAST 2021QNRC001;High Tech Zone Science and Technology Project of Yanjiao(No.YJXM211211);Youth Fund Project of GRINM(No.G12620223129035).

摘　　要：The ceria-zirconia compound oxide-supported noble metal Pd(Pd@CZ)is widely used in three-way catalyst.Moreover,the surface structure of CZ plays an important role in catalytic activity of Pd.However,how to regulate the surface structure of CZ and clarify the structure–activity relationship is still a challenge.In this paper,a strategy is proposed to develop high activity Pd@CZ nanocatalysts by tuning Y doping sites in CZ.The precipitate-deposition method is developed to prepare the novel Ce_(0.485)Zr_(0.485)Y_(0.03)O_(2) composite with surface doping of Y(CZ-Y-S).In addition,the Pd@CZ-Y-S(Pd supported on CZ-Y-S)exhibits superior catalytic activity for HC,CO,and NO oxide,wherein,for CO and C_(3)H_(6) oxidation,the low-temperature activity of Pd@CZ-Y-S is still 20%higher than that of Pd@CZ-Y-B(Y bulk doping)and commercial Pd@CZ after 1000℃/4 h aging.The effect mechanism is further studied by density functional theory(DFT)calculation.Compared with Pd@CZ-Y-B,Pd@CZ-Y-S shows the lower CO oxide reaction energy barriers due to the weaker adsorption strength of O2.The Y surface doping strategy could provide valuable insights for the development of highly efficient Pd@CZ catalyst with extensive applications.

关 键 词：Rare earth Ceria-zirconia-supported Pd Surface doping Experiment and theory Catalytic application 

分 类 号：TQ426[化学工程]