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The Synthesis of Carbon Nanotube on Activated Carbon

The Synthesis of Carbon Nanotube on Activated Carbon. Prof. Dr. Sharifah Bee Abd Hamid , Imran Syakir Mohamad , Norli Abdullah, Ali Rinaldi Combinatorial Technology & Catalysis Research Centre (COMBICAT),

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The Synthesis of Carbon Nanotube on Activated Carbon

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  1. The Synthesis of Carbon Nanotube on Activated Carbon Prof. Dr. Sharifah Bee AbdHamid, ImranSyakirMohamad, Norli Abdullah, Ali Rinaldi Combinatorial Technology & Catalysis Research Centre (COMBICAT), Institute of Postgraduate Studies, University of Malaya, 50603 Kuala Lumpur, Malaysia.

  2. Introduction • Why Activated Carbon? • Cheap and abundant resources • High thermal stability • Why Carbon-Carbon composites? • A new trend in catalysis; metal-free catalyst by exploiting the broad chemical functionality of carbon. • Carbon nanotube exhibit excellent activity and long term stability • However due to the compaction of CNTs bundle, it gives severe technical difficulties • Thus immobilizing CNTs on carbon supports (to avoid chemical discontunities) is a promissing solution

  3. Experimental Substrate (AC) Washing (removes impurities; eg: Al, Si, Fe, K) CNT Nanocarbon Growth (Thermal-CVD) Impregnation • Calcination: 250oC, 5%O2 in N2 • Reduction : 300oC, 5%H2 in N2 • Growth : 550oC, 600oC, 700oC, 850oC Characterization • Compositional analysis (XRD) • Morphology/Structure analysis (SEM, HRTEM) • Texture/Surface Area analysis (BET) • Thermal Gravimetric Analysis

  4. Hierarchically structured carbon One chemical element Strong interaction Super adsorption properties Schematic Concept Ni/AC catalyst Activated carbon Carbon from nature source Impregnation reduction Activation Ni particles Palm kernel shell CVD method C2H4→ C + H2 CNFs/AC composite

  5. Image 200nm Growth inside pore and, on the surface of AC support 2µm 500nm 200nm Activated carbon support

  6. Result & Discussion • Ni particle on activated carbon support Ni catalyst Activated carbon support • The reduced-FFT d spacings measurements indicate the sample is fully reduced to Ni0

  7. Result & Discussion • Microstructure • by increasing the temperature growth; • Catalyst transform from solid to liquid-like behavior • different carbon diffusion in the catalyst • catalyst particle size also increase 550oC 600oC 700oC 850oC

  8. Hysterisis CNF Hysterisis CNT Result & Discussion • Textural properties CNF CNT

  9. Increasing temperature, better graphitization • poor graphitic arrangement Result & Discussion • Microstructure of the Carbon

  10. Result & Discussion • Growth mode in the CNT/AC composite • strong metal-support interactions yield base-growth mode • weak metal-support interactions yield tip-growth mode • the activated carbon is chemically non uniform

  11. Result & Discussion • Growth in fluidized reactor Static furnace • Advantages; • useful for bulk application Rotating furnace

  12. Conclusion • Carbon nanotube has been successfully synthesized by Ni catalyst supported on activated carbon. • The CNF/CNT composition and morphology can be controlled by varying the temperature and fluidization of the catalyst support system during growth.

  13. Carbon Team Thank You..

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