Hydrothermal Stability of Core-Shell Pd@Ce0.5Zr0.5O2/Al2O3 Catalyst for Automobile Three-Way Reaction

被引:84
作者
Li, Lingcong [1 ,2 ]
Zhang, Ningqiang [1 ,2 ]
Huang, Xing [1 ,2 ]
Liu, Ya [1 ,2 ]
Li, Yaoyao [1 ,2 ]
Zhang, Guizhen [1 ,2 ]
Song, Liyun [1 ,2 ]
He, Hong [1 ,2 ,3 ]
机构
[1] Beijing Univ Technol, Key Lab Beijing Reg Air Pollut Control, Beijing 100124, Peoples R China
[2] Beijing Univ Technol, Beijing Key Lab Green Catalysis & Separat, Beijing 100124, Peoples R China
[3] Collaborat Innovat Ctr Elect Vehicles Beijing, Beijing 100081, Peoples R China
关键词
Pd@Ce0.5Zr0.5O2; core-shell structure; OH groups; hydrothermal stability; three-way catalytic activity; HIGH-TEMPERATURE OXIDATION; SURFACE HYDROXYL-GROUPS; SULFUR-DIOXIDE; NANOPARTICLES; PALLADIUM; METHANE; ALUMINA; PHASE; METAL; ADSORPTION;
D O I
10.1021/acscatal.8b00358
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this paper, the hydrothermal stability and catalytic activity of Pd@Ce0.5Zr0.5O2/Al2O3 catalyst with a core-shell structure were investigated for automobile three-way reactions and compared with those of Pd/Al2O3, Pd@CeO2/Al2O3, and Pd@ZrO2/Al2O3 catalysts. TEM, HRTEM, and EDS mapping analyses showed that the core-shell structure of Pd@Ce0.5Zr0.5O2 nanoparticles was intact after the hydrothermal treatment at 1050 degrees C for S h. Meanwhile, CO-DRIFT results suggested that the interface of Pd core and Ce0.5Zr0.5O2. shell acted as the active sites in the reaction of three-way catalysts. Additionally, XPS, FT-M and CO-DRIFT analyses demonstrated that a large amount of OH groups were present on the surface of Pd@Ce0.5Zr0.5O2/Al2O3 catalyst, which could accelerate the decomposition of carbonate species and reduce the activation energy of the catalytic reaction. This was an important reason for the Pd@Ce0.5Zr0.5O2/Al2O3 catalyst to keep the high catalytic activity after aging at high temperature.
引用
收藏
页码:3222 / 3231
页数:19
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