Shape dependence of nanoceria on complete catalytic oxidation of o-xylene

BTX (benzene, toluene, and xylene) in atmosphere, mainly emitted from various industrial processes and transportation activities, are of particular concern due to their potentially highly toxic effects on human health. Catalytic oxidation of o -xylene was investigated on nanosized CeO 2 particles, c...

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Bibliographic Details
Published in:Catalysis science & technology 2016-01, Vol.6 (13), p.4840-4848
Main Authors: Wang, Lian, Wang, Yafei, Zhang, Yan, Yu, Yunbo, He, Hong, Qin, Xiubo, Wang, Baoyi
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
Cubes
Nanostructure
Oxidation
Oxygen
Rods
Water vapor
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Summary:BTX (benzene, toluene, and xylene) in atmosphere, mainly emitted from various industrial processes and transportation activities, are of particular concern due to their potentially highly toxic effects on human health. Catalytic oxidation of o -xylene was investigated on nanosized CeO 2 particles, cubes, and rods, among which rods show the highest activity, which is comparable with those of traditional noble-metal catalysts. CeO 2 nanorods also exhibit long durability for o -xylene oxidation, without deactivation during a 50 h time-on stream test. Over the CeO 2 rods and particles, the presence of water vapor slightly decreased o -xylene conversion, while water vapor enhanced o -xylene oxidation on the CeO 2 cubes. High-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, positron annihilation spectroscopy, and O 2 temperature-programmed desorption measurements revealed that ceria rods enclosed by (111) and (100) facets exhibit the highest concentration of oxygen vacancy clusters (VCs), the presence of which promoted the adsorption of molecular oxygen. The lower the temperature for desorption of chemisorbed O 2 species is, the higher is the activity for o -xylene oxidation, identifying the key role of VCs in this reaction via the activation of molecular oxygen over nanoceria. The finding may also be fundamental for designing ceria-based catalysts with better performance for catalytic oxidation of volatile organic compounds.
ISSN:2044-4753
2044-4761
DOI:10.1039/C6CY00180G