文献类型：期刊文献

英文题名：Catalytic Graphitization of Coal-Based Carbon Materials with Light Rare Earth Elements

作者：Wang, Rongyan[1];Lu, Guimin[1];Qiao, Wenming[2];Yu, Jianguo[1,2]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake R, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2016

卷号：32

期号：34

起止页码：8583

外文期刊名：LANGMUIR

收录：;EI(收录号：20163602776305);WOS:【SCI-EXPANDED(收录号:WOS:000382513900004)】；

基金：This study is supported by the National Natural Science Foundation of China (No. U1407202).

语种：英文

外文关键词：Rare earth elements - Carbides - Graphitization - Energy dispersive spectroscopy - Interfaces (materials) - Scanning electron microscopy - Rare earths - X ray diffraction - Electron diffraction - High resolution transmission electron microscopy

摘要：The catalytic graphitization mechanism of coal based carbon materials with light rare earth elements was investigated using X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, selected area electron diffraction, and high-resolution transmission electron microscopy. The interface between light rare earth elements and carbon materials was carefully observed, and two routes of rare earth elements catalyzing the carbon materials were found: dissolution-precipitation and carbide formation decomposition. These two simultaneous processes certainly accelerate the catalytic graphitization of carbon materials, and light rare earth elements exert significant influence on the microstructure and thermal conductivity of graphite. Moreover, by virtue of praseodymium (Pr), it was found that a highly crystallographic orientation of graphite was induced and formed, which was reasonably attributed to the similar arrangements of the planes perpendicular to (001) in both graphite and Pr crystals. The interface between Pr and carbon was found to be an important factor for the orientation of graphite structure.