Production of Carbon Nanotube by Ethylene Decomposition over Silica-Coated Metal Catalysts
Production of Carbon Nanotube by Ethylene Decomposition over Silica-Coated Metal Catalysts
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DOI：
10.1007/s11244-009-9191-7
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发表时间：
2009-04
影响因子：
3.6
通讯作者：
T. Iguchi;S. Takenaka;Keizo Nakagawa;Yoshiki Orita;H. Matsune;M. Kishida
中科院分区：
文献类型：
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作者：
T. Iguchi;S. Takenaka;Keizo Nakagawa;Yoshiki Orita;H. Matsune;M. Kishida
使用覆盖有二氧化硅层的各种金属催化剂，通过在 973 K 下分解乙烯来形成碳纳米纤维 (CNF) 和碳纳米管 (CNT)。不同直径的CNF是通过在二氧化硅外表面负载的Co金属催化剂上分解乙烯而形成的。相比之下，二氧化硅涂覆的钴催化剂通过乙烯分解形成直径均匀的碳纳米管。二氧化硅涂层的Ni/SiO2和Pt/炭黑也形成了具有均匀直径的CNT，而没有二氧化硅涂层的Ni/SiO2和Pt/炭黑上形成了不同直径的CNF和CNT。这些结果表明包封金属颗粒的二氧化硅层防止乙烯分解过程中金属颗粒的烧结。这导致优先形成直径均匀的碳纳米管。
Formation of carbon nanofibers (CNFs) and carbon nanotubes (CNTs) through the decomposition of ethylene at 973 K was achieved using various metal catalysts covered with silica layers. CNFs of various diameters were formed by ethylene decomposition over a Co metal catalyst supported on the outer surface of the silica. In contrast, silica-coated Co catalysts formed CNTs with uniform diameters by ethylene decomposition. Silica-coated Ni/SiO2and Pt/carbon black also formed CNTs with uniform diameters, while CNFs and CNTs with various diameters were formed over Ni/SiO2and Pt/carbon black without a silica coating. These results indicate that silica layers that envelop metal particles prevent sintering of the metal particles during ethylene decomposition. This results in the preferential formation of CNTs with a uniform diameter.