Formation of Carbon Nanofibers and Carbon Nanotubes through Methane Decomposition over Supported Cobalt Catalysts
Formation of Carbon Nanofibers and Carbon Nanotubes through Methane Decomposition over Supported Cobalt Catalysts
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DOI：
10.1021/jp048827t
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发表时间：
2004-07
影响因子：
3.3
通讯作者：
S. Takenaka;M. Ishida;M. Serizawa;E. Tanabe;K. Otsuka
中科院分区：
文献类型：
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作者：
S. Takenaka;M. Ishida;M. Serizawa;E. Tanabe;K. Otsuka
考察了不同载体（MgO、Al 2 O3、SiO2和TiO 2）负载的Co催化剂对甲烷裂解生成纳米碳纤维的催化性能。负载型Co催化剂在773 K下甲烷分解的催化活性和寿命强烈依赖于催化剂载体的类型;即，Co/Al 2 O3和Co/MgO的催化性能上级Co/TiO 2和Co/SiO2。所有Co催化剂通过在773 K下的反应产生具有相对均匀直径（10 - 30 nm）的碳纳米纤维，而与催化剂载体的种类无关，尽管这些催化剂的Co金属的平均微晶尺寸不同。这些结果表明，直径在10 ~ 30 nm之间的Co金属颗粒优先从甲烷中生长出碳纳米纤维，而直径大于30 nm的Co金属颗粒对甲烷生长碳纳米纤维的反应没有活性。甲烷在Co/Al 2 O3催化剂上分解生成的碳的结构与反应温度有关。多壁碳纳米管
Catalytic performance of Co catalysts supported on different supports (MgO, Al2O3, SiO2, and TiO2) for the formation of carbon nanofibers through methane decomposition was investigated. Catalytic activity and the life of supported Co catalysts for methane decomposition at 773 K strongly depended on the type of catalytic supports; i.e., the catalytic performances of Co/Al2O3 and Co/MgO were superior to those of Co/TiO2 and Co/SiO2. All the Co catalysts produced carbon nanofibers with relatively uniform diameters (10−30 nm) through the reaction at 773 K irrespective of the kind of catalytic supports, although an average crystallite size of Co metal was different for these catalysts. These results implied that Co metal particles with diameters from 10 to 30 nm grew carbon nanofibers from methane preferentially, while ones larger than 30 nm were inactive for the reaction. The structures of carbons formed by methane decomposition over Co/Al2O3 depended on the reaction temperatures. Multiwalled carbon nanotubes...