Carbon nanomaterials produced by the catalytic decomposition of methane over Ni/ZSM-5: Significance of Ni content and temperature
-
摘要: 以ZSM-5分子筛为模板担载金属镍（Ni/ZSM-5）为催化剂，在不同质量分数Ni和温度下进行气相化学沉积过程得到氢气和纳米碳质材料（碳纳米管、纳米炭纤维）。氢气和纳米碳质材料的产率随Ni质量分数增加和反应温度升高而显著地增加，但当Ni含量为8%时产率却减小。纳米碳质材料的形貌与反应温度密切相关。在较高温度下可沉积出碳纳米管，在较低温度下则可得到纳米炭纤维。随着反应时间的延长Ni/ZSM-5的催化活性降低。Abstract: Methane decomposition into hydrogen and carbon nanomaterials (CNMs) was carried out over Ni/ZSM-5 catalysts with different Ni contents at different temperatures. The yields of hydrogen and the CNMs increase significantly with Ni content and reaction temperature, but they level off at high temperatures when the Ni content is over 8 wt.%. The morphology of the CNMs strongly depended on the temperature. Multiwall carbon nanotubes were formed at higher temperature, while carbon nanofibers formed at the lower temperature. The catalytic activity of the Ni/ZSM-5 decreased with time.
-
Key words:
- Methane /
- Carbon nanofibers /
- Carbon nanotubes /
- Nickel /
- ZSM-5
-
点击查看大图
计量
- 文章访问数: 879
- HTML全文浏览量: 67
- PDF下载量: 863
- 被引次数: 0
下载:
