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【资源】95年JC中关于球磨制备Nanophase Fluorite-Structured CeO2–ZrO2 Catalysts的 已有1人参与
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The utilization of mechanical milling for the preparation of catalysts based on ceria structurally modified with zirconia is presented. It is shown that room-temperature high-energy ball milling is an effective tool for the synthesis of nanophase CeO2–ZrO2 solid solution in a wide composition range. The use of combined X-ray diffraction analysis, Raman spectroscopy, and electron microscopy indicate that the milling process induces the formation of true solid solutions with a contraction of the cell parameter for cubic ceria following the introduction of Zr into the lattice. This, in turn, remarkably enhances the oxygen storage/transport and redox capacity compared to pure ceria and zirconia or to a simple mixture thereof. An unusual resistance to high-temperature cycling was also evidenced. These features were analyzed by the study of the reduction profile of doped ceria carried out by temperature-programmed reduction at different milling times. The oxygen storage capacity (OSC) of the catalysts was also evaluated; both the total and the kinetic accessible OSC indicated that the best composition is CexZr1¡xO2 with x>0.5. This was correlated to the structural features and to the presence of a high concentration of ions with redox character (i.e., Ce4C ions) which favor oxygen mobility. http://d.namipan.com/d/a88524bc3eab98b58ad79f504b239a4f7679b016b5e61200 [ Last edited by ^_^@^_^ on 2010-5-9 at 17:04 ] |
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