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提出了利用X射线衍射仪法识别相近固体污染物,并且对固体污染物进行组分测定。确定了组分的贡献率,为确定固体污染物污染来源,控制固体污染物污染探索出一条新的途径。 相似文献
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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. 相似文献
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