硝酸钴催化热解沥青制备碳纳米管

发布时间：2018-01-17 17:16

本文关键词：硝酸钴催化热解沥青制备碳纳米管　出处：《陶瓷学报》2017年05期 　论文类型：期刊论文

【摘要】：以硝酸钴为催化剂、聚乙烯吡咯烷酮(PVP)为保护剂,采用催化热解沥青的方法制备了碳纳米管(CNTs)。研究了热处理温度和催化剂含量对沥青热解后的残碳率、石墨化度及CNTs的生长情况的影响。采用X射线衍射(XRD)及场发射扫描电子显微镜(FE-SEM)对所合成CNTs的相组成、显微结构和生长情况进行了表征。结果表明:(1)催化剂的加入有利于固定沥青热解产生的含碳气体,沥青裂解后的最高残碳率可达69%;相比之下,无催化剂时,试样的残碳率仅为50%左右;(2)催化剂的加入可以降低沥青的石墨化温度,其石墨化度随热处理温度的升高而增大;(3)催化剂的加入还可以促进CNTs的原位生成,实验条件下其最佳用量为0.25wt.%。
[Abstract]:Cobalt nitrate was used as catalyst and polyvinylpyrrolidone (PVP) as protective agent. Carbon nanotubes (CNTsN) were prepared by catalytic pyrolysis of bitumen. The effects of heat treatment temperature and catalyst content on the residual carbon rate of bitumen pyrolysis were studied. Effects of graphitization degree and growth of CNTs on the phase composition of CNTs synthesized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The microstructure and growth were characterized. The results showed that the addition of the catalyst was beneficial to the carbon-containing gas produced by the pyrolysis of the fixed asphalt, and the maximum residual carbon yield of the bitumen after pyrolysis could reach 69g. In contrast, without catalyst, the carbon residue rate of the sample is only about 50%. (2) the graphitization temperature of asphalt can be decreased with the addition of catalyst, and the graphitization degree increases with the increase of heat treatment temperature. The addition of the catalyst can also promote the in situ formation of CNTs, and the optimum dosage of the catalyst is 0.25 wt. under the experimental conditions.
【作者单位】：武汉科技大学省部共建耐火材料与冶金国家重点实验室;
【基金】：国家自然科学基金(51472167) 湖北省自然科学基金创新群体项目(2017CFA004) 湖北省高等学校优秀中青年科技创新团队计划项目(T201602)
【分类号】：TB383.1;TQ127.11
【正文快照】： 0引言应用的酚醛树脂,其在高温裂解后也存在类似沥青的问题,但研究表明将过渡金属Fe[4-6],Co[7]和Ni[8-10]沥青是含碳耐火材料的重要结合剂,具有廉价以金属硝酸盐的形式分散到酚醛树脂中,可将其热富碳的特点。但是,其在高温烘烤过程中会分解产解产物原位转化为碳纳米管、碳纤

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