| 查看: 414 | 回复: 1 | |||
jinkai838木虫 (著名写手)
|
[交流]
【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
|
|
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 ] |
回复此楼» 猜你喜欢
西安交通大学 赵旭课题组 2026年招收博士后-电催化方向
已经有0人回复
-
焙烧后的拉西环状铁钼催化剂侧面硬度高，应该如何降低？
已经有1人回复
-
专业论文润色/翻译怎么收费?
已经有194人回复
-
欢迎来稿
已经有213人回复
-
双一流大学湘潭大学“化工过程模拟与强化”国家地方联合工程研究中心招收博士生
已经有52人回复
-
大连海事大学国家级人才团队（船舶洁净能源研究中心）2027年博士研究生招生启事
已经有1人回复
-
中国地质大学杨明教授组招收2027年博士能源化学、催化材料方向（每月5K+）
已经有56人回复
-
中国地质大学杨明教授组招收2027年博士能源化学、催化材料方向（每月5K+）
已经有58人回复
2楼2010-05-09 14:22:18
