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	Oxygen vacancy clusters essential for the catalytic activity of ceo2 nanocubes for o-xylene oxidation
	Wang, Lian1; Yu, Yunbo1,2,3; He, Hong1,2,3; Zhang, Yan1; Qin, Xiubo4; Wang, Baoyi4
刊名	Scientific reports
	2017-10-09
卷号	7页码:11
ISSN号	2045-2322
DOI	10.1038/s41598-017-13178-6
通讯作者	Yu, yunbo(ybyu@rcees.ac.cn) ; He, hong(honghe@rcees.ac.cn)
英文摘要	Catalytic oxidation of o-xylene was investigated on ceo2 nanocubes calcined at 350, 450, 550, and 650 degrees c, among which the samples calcined at 550 degrees c exhibited the highest activity and long durability. positron annihilation spectroscopy measurements revealed that the size and distribution of oxygen vacancies for ceo2 nanocubes could be tuned by carefully controlling the calcination temperature. an excellent linear correlation between a factor related to size and density of oxygen vacancy clusters and reaction rate of o-xylene oxidation was revealed on ceria nanocubes. this means that oxygen vacancy clusters with suitable size and distribution are responsible for catalytic reaction via simultaneous adsorption and activation of oxygen and o-xylene. electron spin resonance spectra revealed that over the ceo2 cubes, water vapor significantly promoted the formation of center dot oh radicals with a sharp decrease in the signals relating to oxygen vacancies, accelerating the transformation of o-xylene to the intermediate benzoate species, resulting in an enhancement of catalytic activity. water thus serves as a "smart" molecule; its introduction into the feed mixture further confirmed the key role of oxygen vacancies in the catalytic performance of ceo2 nanocubes. a possible mechanism of oxygen vacancy formation during the calcination process was also proposed.
WOS关键词	DEFINED SURFACE PLANES ; CO OXIDATION ; AROMATIC-HYDROCARBONS ; HYDROTHERMAL METHOD ; TOLUENE OXIDATION ; AG/CEO2 CATALYSTS ; CERIA ; NANOCRYSTALS ; ADSORPTION ; OXIDES
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
语种	英语
出版者	NATURE PUBLISHING GROUP
WOS记录号	WOS:000412655400011
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2177093
专题	高能物理研究所
通讯作者	Yu, Yunbo; He, Hong
作者单位	1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100085, Peoples R China 2.Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Reg Atmospher Environm, Xiamen 361021, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Inst High Energy Phys, Key Lab Nucl Anal Tech, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wang, Lian,Yu, Yunbo,He, Hong,et al. Oxygen vacancy clusters essential for the catalytic activity of ceo2 nanocubes for o-xylene oxidation[J]. Scientific reports,2017,7:11.
APA	Wang, Lian,Yu, Yunbo,He, Hong,Zhang, Yan,Qin, Xiubo,&Wang, Baoyi.(2017).Oxygen vacancy clusters essential for the catalytic activity of ceo2 nanocubes for o-xylene oxidation.Scientific reports,7,11.
MLA	Wang, Lian,et al."Oxygen vacancy clusters essential for the catalytic activity of ceo2 nanocubes for o-xylene oxidation".Scientific reports 7(2017):11.

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