Abstract
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 struc-ture-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 pre-cipitate-deposition method is developed to prepare the novel Ce0.485Zr0.485Y0.03O2 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 C3H6 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.
基金项目
国家自然科学基金(52204376)
Youth Foundation of Hebei Province(E2022103007)
Young Elite Scientists Sponsorship Program(CAST 2021QNRC001)
High Tech Zone Science and Technology Project of Yanjiao(YJXM211211)
Youth Fund Project of GRINM(G12620223129035)
NETL
NSTL
万方数据