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首页> 外文期刊>Materials Chemistry and Physics >Carbon nanotubes and onions from methane decomposition using Ni/Al catalysts
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Carbon nanotubes and onions from methane decomposition using Ni/Al catalysts

机译：使用Ni / Al催化剂甲烷分解产生的碳纳米管和洋葱

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摘要

Ni/Al catalysts with different Ni concentrations have been used successfully for the synthesis of carbon nanotubes and onions from methane by chemical vapor deposition. The catalyst nanoparticles were produced by a deposition-precipitation method, and the carbon products by the catalytic decomposition of methane at 600℃. Carbon nanotubes (CNTs) were formed in the presence of a Ni/Al composite catalyst containing 20 wt.% nickel. The CNTs were multi-walled, 10-20 nm in diameter and up to 15 μm long. Hollow carbon onions were produced in the presence of a Ni/Al composite catalyst containing 80 wt.% nickel. The carbon onions were from 5 to 50 nm in diameter and consisted of several concentric carbon layers surrounding a hollow core. The mechanisms for the formation of both the CNTs and carbon onions were discussed on the basis of the experimental results.
机译：具有不同Ni浓度的Ni / Al催化剂已成功用于通过化学气相沉积法从甲烷合成碳纳米管和洋葱。催化剂纳米颗粒通过沉积沉淀法制备，碳产物通过甲烷在600℃催化分解而制得。在含有20wt。％镍的Ni / Al复合催化剂的存在下形成碳纳米管（CNT）。 CNT是多壁的，直径为10-20 nm，最长为15μm。在含有80wt。％镍的Ni / Al复合催化剂的存在下产生空心碳洋葱。碳洋葱的直径为5至50 nm，由围绕空心的几个同心碳层组成。在实验结果的基础上，探讨了碳纳米管和碳纳米管的形成机理。

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