期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 9, 页码 10350-10358出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b20734
关键词
Pd@CeO2/Al2O3; three-way catalyst; moisture; core-shell interface; hydroperoxyl group
资金
- Beijing municipal High Level Innovative Team Building Program [IDHT 20180504]
- General Program of Science and Technology Development Project of Beijing Municipal Education Commission [KM201810005008]
- Natural Science Foundation of China [21777004]
- National Key Research and Development Program of China [2016YFC0204305]
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.
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