Oxygen vacancy clusters essential for the catalytic activity of CeO₂ nanocubes for o-xylene oxidation.

ABSTRACT: Catalytic oxidation of o-xylene was investigated on CeO₂ nanocubes calcined at 350, 450, 550, and 650 °C, among which the samples calcined at 550 °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 resonanc

SUBMITTER: Wang L 

PROVIDER: S-EPMC5634409 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature