甲烷催化裂解制备碳纳米管过程中二氧化碳的影响  

Effect of CO2 on the Preparation of Carbon Nanotubes by Catalytic Cracking of CH4

作　　者：刘玉莹 王小琦 翟茂菁 朱晓玮 杨安宇 董艺 蔡冰玉[1,2] 朴桂林 王昕晔[1,2] Liu Yuying;Wang Xiaoqi;Zhai Maojing;Zhu Xiaowei;Yang Anyu;Dong Yi;Cai Bingyu;Piao Guilin;Wang Xinye(School of Energy and Mechanical Engineering,Nanjing Normal University,Nanjing 210023,China;Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control,Nanjing Normal University,Nanjing 210023,China)

机构地区：[1]南京师范大学能源与机械工程学院,江苏南京210023 [2]南京师范大学江苏省物质循环与污染控制重点实验室,江苏南京210023

出　　处：《南京师范大学学报（工程技术版）》2020年第2期66-71,共6页Journal of Nanjing Normal University(Engineering and Technology Edition)

基　　金：中国博士后科学基金项目(2017M621778);江苏省高校自然科学研究面上项目(17KJB470007);江苏省博士后科研资助计划项目(1701160B)。

摘　　要：生物质发酵沼气含有高浓度CH4,具有制备碳纳米管的潜力,但其中所含的大量CO2对碳纳米管制备存在潜在影响.研究了CH4催化裂解制备碳纳米管过程中CO2的影响,使用商用Ni基催化剂和水平管式炉装置开展碳纳米管制备试验,采用TPR、TPO、SEM、TEM等手段对催化剂和碳纳米管进行表征.650℃时催化裂解效率最高,碳产物最大质量为催化剂质量的4倍,其中主要产物为多壁碳纳米管.CO2对最佳催化裂解温度、催化裂解效率及多壁碳纳米管产量无显著影响,但CO2的存在增加了碳纳米管内外径、长度和平滑度.这可能是由于CH4催化裂解产生无定形积碳,阻碍碳纳米管生长;而CO2与积碳反应清除积碳,促进了碳纳米管生长.从CO2的影响来看,沼气制备碳纳米管具有可行性.Biogas contains high concentrations of CH 4,so it has a potential to produce carbon nanotubes.However,the high concentration of CO2 in it has a potential impact on the preparation.In this paper,we investigate the effect of CO2 on the preparation of carbon nanotubes by catalytic cracking of methane.The carbon nanotube preparation experiments are carried out by using the commercial nickel-based catalyst and the horizontal tube furnace apparatus.The catalysts and carbon nanotubes are characterized by TPR,TPO,SEM,TEM,etc.The highest catalytic cracking efficiency is obtained at 650℃with the maximum mass of carbon products which are 4 times as much as that of the catalyst.The main product is multi-walled carbon nanotubes.CO2 has no effect on the best temperature for catalytic cracking,the highest efficiency of catalytic cracking and the production of multi-wall carbon nanotubes.However,CO2 increases the inner diameter,length and smoothness of the carbon nanotubes,which may be due to the deposited amorphous carbon from CH 4 inhibition of catalytic cracking,that hindered the growth of carbon can nanotubes.However,the reaction of CO2 and deposited carbon removes the deposited carbon,resulting in the enhancement of the carbon nanotubes growth.From the perspective of the impact of CO2,it is feasible to prepare carbon nanotubes from biogas.

关 键 词：沼气 甲烷 二氧化碳 催化裂解 镍 碳纳米管 

分 类 号：TQ546[化学工程—煤化学工程]