Complete catalytic oxidation of o-xylene over CeO2 nanocubes |
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Authors: | Lian He Yunbo Yu Changbin Zhang and Hong He |
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Institution: | State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences,
Beijing 100085, China.,State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences,
Beijing 100085, China. E-mail: ybyu@rcees.ac.cn,State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences,
Beijing 100085, China. and State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences,
Beijing 100085, China. |
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Abstract: | The activities of CeO2 nanocubes calcined at di erent temperatures were tested for catalytic oxidation of o-xylene. Using
CeO2 nanocubes as catalysts, complete catalytic oxidation of o-xylene was achieved below 210°C. The CeO2 nanomaterials were
characterized by means of BET, X-ray di raction (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 f001g planes, which may contribute to the
intrinsically catalytic property of o-xylene oxidation. The higher activity of CeO2 nanocubes calcined at 550°C than those calcined
at above 550°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. |
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Keywords: | CeO2 nanocubes o-xylene catalytic oxidation calcination temperature |
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