In order to realize mass and controllable fabrication of carbon nanotubes(CNTs)with V-type flame method,the Fe/Mo-Al2O3 catalyst system were synthesized by the secondary impregnation method using iron and molybdenum as the active center and nano-Al2O3 as the carrier,then the influences of the carrier calcination and the chelating agents on the morphology of CNTs were studied.The SEM,TEM and raman characterization results of CNTs synthesized by different catalysts showed that the calcined carrier could increase the yield of CNTs and promoted the formation of small diameter CNTs.Citric acid as a chelating agent can effectively improve the quality of CNTs,long and thin carbon nanotubes were formated.The CNTs synthesized using the catalyst with the carrier calcined and citric acid added as the chelating agent had higher yield,fewer defects,smaller average diameter and narrower tube diameter distribution.It was found that the carrier pretreatment and the type of chelating agent can impact the average diameter,diameter distribution and crystallinity of CNTs,which provided a simple and effective way to tune the properties of CNTs.
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基金资助
国家科技支撑计划项目(2015BAA04B02);中央高校基本科研业务费专项资金(2018QN045)
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