title: Complete catalytic oxidation of o-xylene over CeO2 nanocubes.
abstract: The activities of CeO2 nanocubes calcined at different temperatures were tested for catalytic oxidation of o-xylene. Using CeO2 nanocubes as catalysts, complete catalytic oxidation of o-xylene was achieved below 210 degrees C. The CeO2 nanomaterials were characterized by means of BET, X-ray diffraction (XRD), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). From the TEM images, all CeO2 nanocubes displayed cubic morphology irrespective of calcination temperature. The HRTEM images revealed that these nanocubes were enclosed by reactive {001} planes, which may contribute to the intrinsically catalytic property of o-xylene oxidation. The higher activity of CeO2 nanocubes calcined at 550 degrees C than those calcined at above 550 degrees C was attributed to their smaller crystallite size and larger surface area. The influences of reaction conditions were also studied, which found that a higher reaction temperature was necessary for complete catalytic oxidation of o-xylene at higher weight hourly space velocity (WHSV) and o-xylene concentration.
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
authors.forename: Lian
authors.initials: L
authors.lastname: He
authors.forename: Yunbo
authors.initials: Y
authors.lastname: Yu
authors.forename: Changbin
authors.initials: C
authors.lastname: Zhang
authors.forename: Hong
authors.initials: H
authors.lastname: He
mesh_terms: D002384:Catalysis; D002563:Cerium / Q000737:chemistry*; D003460:Crystallization; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010084:Oxidation-Reduction; D013499:Surface Properties; D013696:Temperature; D014961:X-Ray Diffraction; D014992:Xylenes / Q000737:chemistry*
chemical_list: D014992:Xylenes; D002563:Cerium; C030583:ceric oxide; C026114:2-xylene