Journal
JOURNAL OF RARE EARTHS
Volume 40, Issue 11, Pages 1743-1750Publisher
ELSEVIER
DOI: 10.1016/j.jre.2021.10.009
Keywords
CeO2 plane; Pt; CeO2; Toluene oxidation; Metal-supports interaction; Rare earths
Categories
Funding
- Natural Science Foundation for the Higher Education Institutions of Anhui Province of China
- [KJ2020A0236]
- [KJ2018A0638]
- [KJ2019A0079]
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The effect of CeO2 plane exposure on total toluene oxidation was investigated by preparing CeO2 nanorods, nano-octahedrons, and nano-cubes with different plane exposures. The results revealed that the (110) plane of CeO2 was the most beneficial for the dispersion of Pt species, followed by the (111) face. The improved Pt species dispersion enhanced the metal-supports interaction, facilitating the electron transfer and O2 adsorption-activation, thus promoting the total oxidation of toluene.
The plane exposure of support vitally affects the catalytic performance of the catalyst. In this work, CeO2 nanorods ((110) plane exposure), nano-octahedrons ((111) plane exposure) and nano-cubes ((100) plane exposure) were prepared as the supports of Pt/CeO2 samples to investigate the effect of CeO2 plane exposure on total toluene oxidation. Characterizations reveal that the (110) plane of CeO2 is more helpful to the dispersion of Pt species, followed by (111) face. The improved dispersion of Pt species can enhance the metal-supports interaction, which promotes the electron transfer of CeO2 carrier to Pt nanoparticles and the adsorption-activation of O2, thereby facilitating the total oxidation of toluene via the Langmuir-Hinshelwood (L-H) mechanism. Therefore, Pt/CeO2-r (nanorods) sample expresses excellent catalytic performance of toluene oxidation. Finally, the procedure of toluene total oxidation was studied by in-situ diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. We expect that this work can contribute to the development of an effective sample for the decomposition of volatile organic com-pounds (VOCs).(c) 2022 Published by Elsevier B.V. on behalf of Chinese Society of Rare Earths.
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