Synthesis of carbon nanotubes by CCVD of natural gas using hydrotreating catalysts |
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Authors: | Ahmed E. Awadallah Sohair M. Abdel-Hamid Doaa S. El-Desouki Ateyya A. Aboul-Enein Ahmed K. Aboul-Gheit |
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Affiliation: | Process Development Division, Egyptian Petroleum Research Institute, Nasr City, Egypt |
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Abstract: | Carbon nanotubes have been successfully synthesized using the catalytic chemical vapor deposition (CCVD) technique over typical refining hydrotreating catalysts (hydrodesulfurization and hydrodenitrogenation) containing Ni–Mo and Co–Mo supported on Al2O3 catalysts at 700°C in a fixed bed horizontal reactor using natural gas as a carbon source. The catalysts and the as-grown CNTs were characterized by transmission electron microscopy, HRTEM, X-ray diffraction patterns, EDX and TGA–DTG. The obtained data clarified that the Ni–Mo catalyst gives higher yield, higher purity and selectivity for CNTs compared to Co–Mo catalyst. XRD, TEM and TGA reveal also that the Ni–Mo catalyst produces mostly CNTs with different diameters whereas the Co–Mo catalyst produces largely amorphous carbon. |
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