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Shape dependence of nanoceria on complete catalytic oxidation of o-xylene
Wang, L; Wang, YF; Zhang, Y; Yu, YB; He, H; Qin, XB; Wang, BY; Qin XB(秦秀波); Wang BY(王宝义)
2016
发表期刊CATALYSIS SCIENCE & TECHNOLOGY
卷号6期号:13页码:4840
文章类型期刊论文
摘要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 CeO2 particles, cubes, and rods, among which rods show the highest activity, which is comparable with those of traditional noble-metal catalysts. CeO2 nanorods also exhibit long durability for o-xylene oxidation, without deactivation during a 50 h time-on stream test. Over the CeO2 rods and particles, the presence of water vapor slightly decreased o-xylene conversion, while water vapor enhanced o-xylene oxidation on the CeO2 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 t(h)is 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.
DOI10.1039/c6cy00180g
关键词[WOS]VOLATILE ORGANIC-COMPOUNDS ; DEFINED SURFACE PLANES ; PROBING DEFECT SITES ; AROMATIC-HYDROCARBONS ; METAL-OXIDE ; TOLUENE OXIDATION ; CEO2 NANOCRYSTALS ; OXYGEN VACANCIES ; LOW-TEMPERATURES ; CARBON-MONOXIDE
WOS类目Chemistry, Physical
WOS记录号WOS:000378734700024
引用统计
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/260508
专题核技术应用研究中心
作者单位中国科学院高能物理研究所
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GB/T 7714
Wang, L,Wang, YF,Zhang, Y,et al. Shape dependence of nanoceria on complete catalytic oxidation of o-xylene[J]. CATALYSIS SCIENCE & TECHNOLOGY,2016,6(13):4840.
APA Wang, L.,Wang, YF.,Zhang, Y.,Yu, YB.,He, H.,...&王宝义.(2016).Shape dependence of nanoceria on complete catalytic oxidation of o-xylene.CATALYSIS SCIENCE & TECHNOLOGY,6(13),4840.
MLA Wang, L,et al."Shape dependence of nanoceria on complete catalytic oxidation of o-xylene".CATALYSIS SCIENCE & TECHNOLOGY 6.13(2016):4840.
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