The synthesis of carbon nanotubes （CNTs） via chemical vapour deposition of methane on NiO/γ-Al2O3 catalyst has been investigated.The reduction behavior of NiO/γ-Al2O3 by methane was studied using thermogravimetric...The synthesis of carbon nanotubes （CNTs） via chemical vapour deposition of methane on NiO/γ-Al2O3 catalyst has been investigated.The reduction behavior of NiO/γ-Al2O3 by methane was studied using thermogravimetric （TG） and X-ray diffraction （XRD） techniques.It was found that the NiO supported on γ-Al2O3,was reduced to Ni0 in methane atmosphere in the temperature range of 710-770℃.The catalytic activity of NiO/γ-Al2O3 for CNTs synthesis by in situ chemical vapour deposition of methane during the reduction was also investigated.Scanning electron microscopy （SEM） and transmission electron microscopy （TEM） were used to observe the CNTs produced at various reduction temperatures.The results indicated that the reduction temperature exhibits obvious influence on the morphology and the yield of CNTs.CNTs with the diameter of about 20 nm were obtained at reduction temperature of 750℃,and higher reduction temperature （such as 800 and 850℃） led to an increase in CNTs diameter and a decrease in CNTs yield.展开更多
基金supported by the Key Project of Chinese Ministry of Education(No. 208076)Foundation for Outstanding Young Scientist in Shandong Province(BS2009CL004)the Open Foundation of Chemical Engineering Subject of Qingdao University of Science & Technology(No. 20100102)
文摘The synthesis of carbon nanotubes （CNTs） via chemical vapour deposition of methane on NiO/γ-Al2O3 catalyst has been investigated.The reduction behavior of NiO/γ-Al2O3 by methane was studied using thermogravimetric （TG） and X-ray diffraction （XRD） techniques.It was found that the NiO supported on γ-Al2O3,was reduced to Ni0 in methane atmosphere in the temperature range of 710-770℃.The catalytic activity of NiO/γ-Al2O3 for CNTs synthesis by in situ chemical vapour deposition of methane during the reduction was also investigated.Scanning electron microscopy （SEM） and transmission electron microscopy （TEM） were used to observe the CNTs produced at various reduction temperatures.The results indicated that the reduction temperature exhibits obvious influence on the morphology and the yield of CNTs.CNTs with the diameter of about 20 nm were obtained at reduction temperature of 750℃,and higher reduction temperature （such as 800 and 850℃） led to an increase in CNTs diameter and a decrease in CNTs yield.
