Investigation of CoOx/AC catalysts in methane chemical vapour decomposition process for carbon nanotube (CNT) synthesis

V. M. Sivakumar, A. Z. Abdullah, A. R. Mohamed, S. P. Chai

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    Abstract

    Nowadays, activated carbon (AC) is one of the most easily available and potentially significant materials for industrial applications because of its higher surface area and porosity as compared to other traditional supports. It has the advantage of decomposing hydrocarbon gases like methane (CH4) at even lower temperature [1-3]. Previous studies by our group showed the significance of CoO/Al2O3catalyst over CoO/SiO 2, CoO/CaO, CoO/CeO2, CoO/H-ZSM-5, CoO/MgO, and CoO/TiO2 in CNT formation [4-5]. The main purpose of this work is to investigate the CoOx/AC catalyst in methane chemical vapour decomposition (m-CVD) for synthesizing CNTs. The effects of catalyst preparation conditions such as metal loading, calcination and reduction temperatures on the morphology and the quality of CNTs formed were investigated. CoOx/AC catalyst samples were prepared with 5, 10, 15 and 20 wt% of cobalt oxide loadings by wetness impregnation method. The impregnated samples were dried at 105°C for 12 h and calcined in N2 at 350/450°C for 3 h. The calcined samples were further subjected to a reduction under H2 atmosphere in a tubular quartz reactor at two different temperatures of 450 and 550°C for 3 h. The schematic diagram of the experimental set-up was described elsewhere [6]. High purity CH4 (99.99 %) was mixed with N2 (99.99 %) with a flow rate ratio of 1: 2 (CH4: N: 2 = 120: 240 ml/min) before entering the reactor. For synthesizing nanotube materials, 0.2 g of CoOx/AC catalyst was placed on a quartz boat in an electrical furnace and heated under N2 flow to the desired temperatures for a period of 60 min to study the CoOx/AC catalyst activity and its performance in m-CVD and CNT formation.

    Original languageEnglish
    Title of host publicationProceedings - 2010 8th International Vacuum Electron Sources Conference and Nanocarbon, IVESC 2010 and NANOcarbon 2010
    Pages367-368
    Number of pages2
    DOIs
    Publication statusPublished - 2010
    EventInternational Vacuum Electron Sources Conference 2010 - Nanjing, China
    Duration: 14 Oct 201016 Oct 2010
    Conference number: 8th
    https://ieeexplore.ieee.org/xpl/conhome/5634962/proceeding (Proceedings)

    Publication series

    NameProceedings - 2010 8th International Vacuum Electron Sources Conference and Nanocarbon, IVESC 2010 and NANOcarbon 2010

    Conference

    ConferenceInternational Vacuum Electron Sources Conference 2010
    Abbreviated titleIVESC 2010
    CountryChina
    CityNanjing
    Period14/10/1016/10/10
    Internet address

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