以 Ni/ZSM-5 为催化剂制备纳米碳质材料( 英文)

Carbon nanomaterials produced by the catalytic decomposition of methane over Ni / ZSM-5: Significance of Ni content and temperature

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。

Methane decomposition into hydrogen and carbon nanomaterials （CNMs） was carded 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 reac- tion temperature, but they level off at high temperatures when the Ni content is over 8 wt. %. The morphology of the CNMs strong- ly 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.