在氧化催化剂上对化物种的直接中子光谱观测
Zili Wu, Yongqiang Cheng, Franklin Tao1
1Department of Chemical and Petroleum Engineering and Department of Chemistry, University of Kansas , Lawrence, Kansas 66047, United States.
Journal of the American Chemical Society
|June 28, 2017
概括
这项研究提供了化反应期间氧化物 () 中物种 (Ce-H) 的第一个光谱证据. 这些发现揭示了在催化剂上激活的异质化机制.
科学领域:
- 材料科学
- 催化剂
- 表面化学
背景情况:
- 在选择性化中,Ceria表现出有前途的催化活性.
- 精确的激活机制 (H2解离) 仍然不清楚,阻碍了催化剂的优化.
研究的目的:
- 在化反应中阐明H2解离的机制.
- 提供在表面和大量形成的物种的直接光谱证据.
主要方法:
- 在现场无弹性中子散射 (INS) 光谱检测表面和批量Ce-H物种.
- 在现场环境压力X射线光电子光谱 (AP-XPS).
- 红外 (IR) 和拉曼光谱.
主要成果:
- 在H2暴露时观察到表面和散装Ce-H物种的直接光谱证据.
- 一个异质的H2解离机制被提出在ceria上.
- 反应途径取决于的表面积和氧空位的存在,导致均溶性 (表面OHs) 或异溶性 (Ce-H和OH) 产物.
结论:
- 这项研究提供了首次Ce-H物种的直接光谱证据,阐明了H2激活机制.
- 这些发现对设计含和氧化还原反应的基催化剂具有重要意义.
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