High-resolution transmission electron microscopy study of carbon deposited on the NiO MgO solid solution catalysts

被引:62
作者
Hu, YH [1 ]
Ruckenstein, E [1 ]
机构
[1] SUNY Buffalo, Dept Chem Engn, Buffalo, NY 14260 USA
关键词
NiO; MgO; solid solution; carbon deposition; HRTEM; lattice fringe;
D O I
10.1006/jcat.1999.2449
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The carbon deposition due to the CH4 decomposition at 790 degrees C over NiO/MgO catalysts was investigated by high-resolution transmission electron microscopy. While no deposits could be detected over the catalysts with a NiO content smaller than 9.1 wt%, they were detected over the catalysts with NiO contents of 23 and 50 wt%. The carbon deposits are composed of platelets located at distances of about 0.34 nm, corresponding to the graphitic carbon. Various structures of the deposited carbon were observed: (a) carbon consisting of platelets parallel to the surface of the particle, which covers a catalyst particle, (b) nanotubes composed of platelets parallel to their axis, and (c) carbon vortexes consisting of platelets parallel to their axis, (C) 1999 Academic Press.
引用
收藏
页码:298 / 302
页数:5
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