Ni基催化剂上CH_4裂解制备纳米碳管的研究

Preparation of Carbon Nanotube by Reacting CH_4 over Ni-based Catalysts

本文研究了负载型Ni催化剂上,以CH_4为原料制备纳米碳管的方法.考察了载体、温度、CH_4浓度及在反应气中添加O_2或CO_2等因素对纳米碳管的生长的影响.实验发现,采用稀释的CH_4在较低的温度下反应或在反应气中添加O_2或CO_2均有利于纳米碳管的生长.

Carbon nanotube was prepared by reacting CH4 over supported Ni catalyst at elevated temperature. The influences of support and other reaction conditions such as temperature, CH4 concentration and addition of O2 or CO2 to the reactant on the formation of carbon nanotube were investigated. It was found that the formation of carbon nanotube was favoured when the reaction was performed at relatively low temperature with dilute CH4 as the reactant. Addition of O2 or CO2 to the reactant is helpful to the removal of graphite and amorphous carbon deposition on the catalyst and therefore will be favorable to the growth of carbon nanotube.