Comparative Study of Moisture-Treated Pd@CeO2/Al2O3 and Pd/CeO2/Al2O3 Catalysts for Automobile Exhaust Emission Reactions: Effect of Core-Shell Interface

被引：60
作者：
Li, Lingcong [1 ,2 ]
Zhang, Ningqiang [1 ,2 ,3 ]
Wu, Rui [1 ,2 ]
Song, Liyun [1 ,2 ]
Zhang, Guizhen [1 ,2 ]
He, Hong [1 ,2 ,4 ]
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] Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China
[4] Collaborat Innovat Ctr Elect Vehicles Beijing, Beijing 100081, Peoples R China
来源：
ACS APPLIED MATERIALS & INTERFACES | 2020年 / 12卷 / 09期
关键词：
Pd@CeO2/Al2O3; three-way catalyst; moisture; core-shell interface; hydroperoxyl group; METHANE COMBUSTION; N2O FORMATION; NO REDUCTION; TEMPERATURE; OXIDATION; STABILITY; MECHANISM; PERFORMANCE; NANOPARTICLES; PROPANE;
D O I：
10.1021/acsami.9b20734
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In this article, moisture-treated Pd@CeO2/Al2O3 and Pd/CeO2/Al2O3 catalysts were synthesized and applied in automotive three-way catalytic (TWC) reactions. Compared to the Pd/CeO2/Al2O3 catalyst, the Pd@CeO2/Al2O3 core-shell catalyst had better TWC activities. Transmission electron microscopy (TEM) images and X-ray photoelectron spectra (XPS) showed excess PdO2 on the Pd and CeO2 interface of Pd@CeO2 nanoparticles. Fourier transform infrared (FT-IR) spectra analysis demonstrated the generation of the hydroperoxyl (*OOH) groups on the surface of the Pd@CeO2 nanoparticle. CO-diffuse reflectance Fourier transform (DRIFT) measurement suggested that the CO adsorbed on *OOH species contributed to the formation of CO2 and intermediate *COOH. NO-DRIFT results showed that more *NO2 species appeared on the moisture-treated Pd@CeO2 nanoparticle, which was the main active site in the automobile TWC reaction. These were the main factors contributing to the moisture-treated Pd@CeO2/Al2O3 catalyst's high catalytic activities. The collected data revealed the crucial role of the co-promoting effect of moisture and core-shell interface on TWC reactions over the Pd@CeO2/Al2O3 catalyst, which could be applied to other catalytic reactions.
引用
收藏
页码：10350 / 10358
页数：9
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