Mass production of aligned carbon nanotube arrays by fluidized bed catalytic chemical vapor deposition
Mass production of aligned carbon nanotube arrays by fluidized bed catalytic chemical vapor deposition
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DOI：
10.1016/j.carbon.2009.11.043
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发表时间：
2010-04
期刊：
影响因子：
10.9
通讯作者：
Qiang Zhang;Mengqiang Zhao;Jiaqi Huang;Jingqi Nie;F. Wei
中科院分区：
文献类型：
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作者：
Qiang Zhang;Mengqiang Zhao;Jiaqi Huang;Jingqi Nie;F. Wei
通过参数化研究，考察了活性相负载量、生长温度、h2o2还原、空速和视气速对层状催化剂中垂直排列碳纳米管（CNT）阵列插层生长的影响。对铁/蛭石比为0.0075 ~ 0.300的Fe/Mo/蛭石系列催化剂进行了试验。过氧化还原后，金属颗粒分散在蛭石层间。在650℃下，蛭石层之间形成了粒径为10 ~ 20nm、密度为8.5×1014m−2的均匀催化剂颗粒。高密度的碳纳米管在蛭石中同步生长成阵列。随着生长温度的升高，嵌套在蛭石间的碳纳米管的对准性变差。此外，在不同的流动状态下，在蛭石层之间合成了插层碳纳米管。流化床反应器在颗粒流化和鼓泡流化状态下的生长产物粒径为1 ~ 2mm，而在湍流流化状态下的生长产物粒径明显减小。基于对所研究的各种参数的理解，在中试流化床反应器中批量生产了3.0kg/h的碳纳米管阵列。
A parametric study investigating the impacts of loading amount of active phase, growth temperature, H2reduction, space velocity, and apparent gas velocity on the intercalated growth of vertically aligned carbon nanotube (CNT) arrays among lamellar catalyst was performed. A series of Fe/Mo/vermiculite catalysts with Fe/vermiculite ratio of 0.0075–0.300 were tested. Metal particles were dispersed among the layers of vermiculite after H2reduction. Uniform catalyst particles, with a size of 10–20nm and a density of 8.5×1014m−2, were formed among the vermiculite layers at 650°C. CNTs with high density synchronously grew into arrays among the vermiculites. With the increasing growth temperature, the alignment of CNTs intercalated among vermiculites became worse. Moreover, intercalated CNTs were synthesized among vermiculite layers in various flow regimes. The as-grown particles were with a size of 1–2mm when the fluidized bed reactor was operated in particulate fluidization and bubbling fluidization, while the size of the as-grown products decreased obviously when they grown in the turbulent fluidized bed. Based on the understanding of the various parameters investigated, 3.0kg/h of CNT arrays were mass produced in a pilot plant fluidized bed reactor.