DEVELOPMENT OF CO/AL2O3 COMPOSITE CATALYST AND ITS APPLICATION FOR CARBON NANOTUBES (CNTS) GROWTH BY CATALYTIC VAPOUR DEPOSITION (CVD) TECHNIQUES

O. K. Abubakre, A. S. Abdulkareem, B. Suleiman, O. E. Eleri, M. T. Bankole, A. S. Kovo

Abstract


The synthesis of Multi-Walled Carbon Nanotube (MWCNTs) using Cobalt supported on aluminium oxide via Catalytic Vapour Deposition (CVD) technique was reported. The effects of operating parameters such as drying temperature, drying time, stirring speed and mass of support on the yield of Co/Al2O3 were studied using 24 experimental designs. The highest yield of catalyst (81.25 %) was obtained at mass of support (5.9 g), stirring speed (200 rpm), drying time (7 h) and drying temperature of 120 oC. The catalyst was then characterized to determine the morphology, surface area, crystallinity and surface functional group. Results of characterization revealed that the cobalt was well dispersed on Al2O3 support with specific surface area (156.1 m2/g) and crystalline size (21.84-65.47 nm). The developed catalyst by wet impregnation method at the optimum condition was used in a CVD reactor to produce carbon nanotubes and the effect of reaction time on the yield was investigated with optimum yield of 23 % produced at production time of 45 min. The CNTs were characterized and the results obtained indicated that the CNTs produced are MWCNTs with specific surface area of 279 m2/g. The synthesized MWCNTs were found to possess high thermal stablility at elevated temperatures with about 12 % weight loss. Therefore, the study shows the suitability of the developed Co/Al2O3 catalyst for the production of high purity MWCNTs in a CVD reactor.
Keywords: alumina, cobalt, wet impregnation, monometallic composite catalyst, CVD,
MWCNTs


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