期刊
JOURNAL OF ENVIRONMENTAL SCIENCES
卷 23, 期 1, 页码 160-165出版社
SCIENCE PRESS
DOI: 10.1016/S1001-0742(10)60388-9
关键词
CeO2 nanocubes; o-xylene; catalytic oxidation; calcination temperature
资金
- National Natural Science Foundation of China [50921064, 20973193]
- Ministry of Science and Technology of China [2007AA061402, 2010CB732304]
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.
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